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Mon Oct 8 16:18:38 2007 UTC (13 years, 7 months ago) by dpavlin
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++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.905 2005/08/16 09:16:24 debug Exp $
20050628	Continuing the work on the ARM translation engine. end_of_page
		works. Experimenting with load/store translation caches
		(virtual -> physical -> host).
20050629	More ARM stuff (memory access translation cache, mostly). This
		might break a lot of stuff elsewhere, probably some MIPS-
		related translation things.
20050630	Many load/stores are now automatically generated and included
		into cpu_arm_instr.c; 1024 functions in total (!).
		Fixes based on feedback from Alec Voropay: only print 8 hex
		digits instead of 16 in some cases when emulating 32-bit
		machines; similar 8 vs 16 digit fix for breakpoint addresses;
		4Kc has 16 TLB entries, not 48; the MIPS config select1
		register is now printed with "reg ,0".
		Also changing many other occurances of 16 vs 8 digit output.
		Adding cache associativity fields to mips_cpu_types.h; updating
		some other cache fields; making the output of
		mips_cpu_dumpinfo() look nicer.
		Generalizing the bintrans stuff for device accesses to also
		work with the new translation system. (This might also break
		some MIPS things.)
		Adding multi-load/store instructions to the ARM disassembler
		and the translator, and some optimizations of various kinds.
20050701	Adding a simple dev_disk (it can read/write sectors from
		disk images).
20050712	Adding dev_ether (a simple ethernet send/receive device).
		Debugger command "ninstrs" for toggling show_nr_of_instructions
		during runtime.
		Removing the framebuffer logo.
20050713	Continuing on dev_ether.
		Adding a dummy cpu_alpha (again).
20050714	More work on cpu_alpha.
20050715	More work on cpu_alpha. Many instructions work, enough to run
		a simple framebuffer fill test (similar to the ARM test).
20050716	More Alpha stuff.
20050717	Minor updates (Alpha stuff).
20050718	Minor updates (Alpha stuff).
20050719	Generalizing some Alpha instructions.
20050720	More Alpha-related updates.
20050721	Continuing on cpu_alpha. Importing rpb.h from NetBSD/alpha.
20050722	Alpha-related updates: userland stuff (Hello World using
		write() compiled statically for FreeBSD/Alpha runs fine), and
		more instructions are now implemented.
20050723	Fixing ldq_u and stq_u.
		Adding more instructions (conditional moves, masks, extracts,
20050724	More FreeBSD/Alpha userland stuff, and adding some more
		instructions (inserts).
20050725	Continuing on the Alpha stuff. (Adding dummy ldt/stt.)
		Adding a -A command line option to turn off alignment checks
		in some cases (for translated code).
		Trying to remove the old bintrans code which updated the pc
		and nr_of_executed_instructions for every instruction.
20050726	Making another attempt att removing the pc/nr of instructions
		code. This time it worked, huge performance increase for
		artificial test code, but performance loss for real-world
		code :-( so I'm scrapping that code for now.
		Tiny performance increase on Alpha (by using ret instead of
		jmp, to play nice with the Alpha's branch prediction) for the
		old MIPS bintrans backend.
20050727	Various minor fixes and cleanups.
20050728	Switching from a 2-level virtual to host/physical translation
		system for ARM emulation, to a 1-level translation.
		Trying to switch from 2-level to 1-level for the MIPS bintrans
		system as well (Alpha only, so far), but there is at least one
		problem: caches and/or how they work with device mappings.
20050730	Doing the 2-level to 1-level conversion for the i386 backend.
		The cache/device bug is still there for R2K/3K :(
		Various other minor updates (Malta etc).
		The mc146818 clock now updates the UIP bit in a way which works
		better with Linux for at least sgimips and Malta emulation.
		Beginning the work on refactoring the dyntrans system.
20050731	Continuing the dyntrans refactoring.
		Fixing a small but serious host alignment bug in memory_rw.
		Adding support for big-endian load/stores to the i386 bintrans
		Another minor i386 bintrans backend update: stores from the
		zero register are now one (or two) loads shorter.
		The slt and sltu instructions were incorrectly implemented for
		the i386 backend; only using them for 32-bit mode for now.
20050801	Continuing the dyntrans refactoring.
		Cleanup of the ns16550 serial controller (removing unnecessary
		Bugfix (memory corruption bug) in dev_gt, and a patch/hack from
		Alec Voropay for Linux/Malta.
20050802	More cleanup/refactoring of the dyntrans subsystem: adding
		phys_page pointers to the lookup tables, for quick jumps
		between translated pages.
		Better fix for the ns16550 device (but still no real FIFO
		Converting cpu_ppc to the new dyntrans system. This means that
		I will have to start from scratch with implementing each
		instruction, and figure out how to implement dual 64/32-bit
		modes etc.
		Removing the URISC CPU family, because it was useless.
20050803	When selecting a machine type, the main type can now be omitted
		if the subtype name is unique. (I.e. -E can be omitted.)
		Fixing a dyntrans/device update bug. (Writes to offset 0 of
		a device could sometimes go unnoticed.)
		Adding an experimental "instruction combination" hack for
		ARM for memset-like byte fill loops.
20050804	Minor progress on cpu_alpha and related things.
		Finally fixing the MIPS dmult/dmultu bugs.
		Fixing some minor TODOs.
20050805	Generalizing the 8259 PIC. It now also works with Cobalt
		and evbmips emulation, in addition to the x86 hack.
		Finally converting the ns16550 device to use devinit.
		Continuing the work on the dyntrans system. Thinking about
		how to add breakpoints.
20050806	More dyntrans updates. Breakpoints seem to work now.
20050807	Minor updates: cpu_alpha and related things; removing
		dev_malta (as it isn't used any more).
		Dyntrans: working on general "show trace tree" support.
		The trace tree stuff now works with both the old MIPS code and
		with newer dyntrans modes. :)
		Continuing on Alpha-related stuff (trying to get *BSD to boot
		a bit further, adding more instructions, etc).
20050808	Adding a dummy IA64 cpu family, and continuing the refactoring
		of the dyntrans system.
		Removing the regression test stuff, because it was more or
		less useless.
		Adding loadlinked/storeconditional type instructions to the
		Alpha emulation. (Needed for Linux/alpha. Not very well tested
20050809	The function call trace tree now prints a per-function nr of
		arguments. (Semi-meaningless, since that data isn't read yet
		from the ELFs; some hardcoded symbols such as memcpy() and
		strlen() work fine, though.)
		More dyntrans refactoring; taking out more of the things that
		are common to all cpu families.
20050810	Working on adding support for "dual mode" for PPC dyntrans
		(i.e. both 64-bit and 32-bit modes).
		(Re)adding some simple PPC instructions.
20050811	Adding a dummy M68K cpu family. The dyntrans system isn't ready
		for variable-length ISAs yet, so it's completely bogus so far.
		Re-adding more PPC instructions.
		Adding a hack to src/file.c which allows OpenBSD/mac68k a.out
		kernels to be loaded.
		Beginning to add PPC loads/stores. So far they only work in
		32-bit mode.
20050812	The configure file option "add_remote" now accepts symbolic
		host names, in addition to numeric IPv4 addresses.
		Re-adding more PPC instructions.
20050814	Continuing to port back more PPC instructions.
		Found and fixed the cache/device write-update bug for 32-bit
		MIPS bintrans. :-)
		Triggered a really weird and annoying bug in Compaq's C
		compiler; ccc sometimes outputs code which loads from an
		address _before_ checking whether the pointer was NULL or not.
		(I'm not sure how to handle this problem.)
20050815	Removing all of the old x86 instruction execution code; adding
		a new (dummy) dyntrans module for x86.
		Taking the first steps to extend the dyntrans system to support
		variable-length instructions.
		Slowly preparing for the next release.
20050816	Adding a dummy SPARC cpu module.
		Minor updates (documentation etc) for the release.

==============  RELEASE 0.3.5  ==============

1 dpavlin 12 $Id: HISTORY,v 1.905 2005/08/16 09:16:24 debug Exp $
2 dpavlin 2
3     Changelog for GXemul:
4     ---------------------
6     20030829 Skeleton. ELF stuff. Some instructions.
7     20030830 Simple test programs using +-*/^|&%, function calls,
8     loops, and stuff like that work.
9     20030903 Adding more instructions, fixing some bugs.
10     20030907 Making adding of memory mapped devices easier, although
11     the framework isn't built for speed.
12     Adding a -q switch to turn of debug output.
13     20030911 Trying to fix some bugs. Minor changes. Some COP0
14     registers are now meaningful.
15     20030919 Making APs (non-bootstrap cpus) available via a simple
16     'mp' device. Implementing ll/lld and sc/scd (for atomic
17     memory updates, needed by MP operating systems).
18     20030923 Minor updates: more instructions (divu, mulu, lwu,
19     perhaps some more), and opcode usage statistics.
20     20030924 If the next instruction is nullified (for 'branch
21     likely' type of instructions), counters for delays etc
22     are now decreased as they should.
23     Adding some comments.
24     Adding instructions: movz, movn.
25     Adding a simple mandelbrot test to mipstest.c.
26     20030925 Adding instructions: bltzl, bgezl, lh, lhu, sh, mfc*,
27     mtc*.
28     Adding a dummy instructions: sync, cache.
29     Adding minimal DECstation PROM functionality: printf()
30     and getsysid() callback functions.
31     Beginning work on address translation.
32     20030927 Adding some more cop0 functionality (tlb stuff).
33     Adding mc146818 real-time clock. (Skeleton stuff.)
34     20030928 Adding a dc7085 serial console device (dummy, but enough
35     to output chars to the screen). NetBSD uses this for
36     the MIPSMATE 5100.
37     20030929 Working on the TLB stuff.
38     Adding instructions: srlv, tlbwr, tlbr, tlbp, eret.
39     20030930 Trying to find a bug which causes NetBSD to bug out, but
40     it is really hard.
41     Adding some a.out support (for loading an old
42     OpenBSD 2.8/pmax kernel image).
43     Adding instructions: lwc*, ldc*, swc1 and swc3.
44     Beginning to add special code to handle the differences
45     between R4000 (the default emulation) and R2000/R3000.
46     20031001 Symbol listings produced by 'nm -S' can be used to
47     show symbolic names for addresses. (-S)
48     20031002 Fixing the i/d fake cache for R2000/R3000. It's still
49     just an ugly hack, though.
50     Fixing minor bugs to make the 3100 emulation use the
51     dc device (serial console) correctly. So far, 5100 and
52     3100 are the only ones that get far enough to print
53     stuff, when booting NetBSD.
54     20031004 Adding skeleton Cobalt machine emulation (-E).
55     Adding a dummy ns16550 serial controller, used by the
56     Cobalt machine emulation.
57     20031006 Adding unaligned load/store instructions (lwl, lwr,
58     ldl, ldr, swl, swr, sdl, sdr), although they are not
59     tested yet.
60     Fixed a "data modified on freelist" bug when running
61     NetBSD/cobalt: setting the top bit of the index register
62     when a tlbp fails (as the R4000 manual says) isn't
63     sufficient, I had to clear the low bits as well.
64     Adding break and syscall instructions, but they are not
65     tested yet.
66     Adding a 'gt' device, faking a PCI bus, for the Cobalt
67     emulation.
68     20031008 Adding initial support for HPCmips (-F), a framebuffer
69     device using X11. NetBSD/hpcmips can output pixels to
70     the framebuffer, but that's about it.
71     20031009 Fixing the NetBSD/pmax bug: the "0/tftp/netbsd" style
72     bootstring was only passed correctly in the bootinfo
73     block, it needs to be passed as argv[0] as well.
74     Adding instructions: mtlo, mthi.
75     Rearrangning the source tree layout.
76     Adding console input functionality. The NetBSD/cobalt
77     kernel's ddb can now be interacted with.
78     20031010 Adding experimental (semi-useless) -t option, to show
79     a function call tree while a program runs.
80     Linux/cobalt now prints a few messages, but then hangs
81     at "Calibrating delay loop..." unless an ugly hack is
82     used (setting a word of memory at 0x801e472c to non-zero).
83     20031013 Adding a framebuffer device used in DECstation 3100;
84     VFB01 for mono is implemented so far, not yet the
85     VFB02 (color) variant. Rewriting the framebuffer
86     device so that it is usable by both HPCmips and DECstation
87     emulation.
88     20031014 Minor fixes. Everything should compile and run ok
89     both with and without X11.
90     20031015 Adding support for ECOFF binary images; text, data,
91     and symbols are loaded. (Playing around with ultrixboot
92     and ultrix kernels.)
93     20031016 The DECstation argv,argc stuff must be at 0xa0000000,
94     not 0x80000000, or Ultrix kernels complain.
95     Adding R2000/R3000 'rfe' instruction.
96     Implementing more R2K/R3K tlb specific stuff, so that
97     NetBSD boots and uses the tlb correctly, but much of
98     it is ugly. (Needs to be separated in a cleaner way.)
99     ECOFF symbols sizes are now calculated, so that offsets
100     within symbols are usable.
101     20031017 DECstation bootstrings now automatically include the
102     correct name of the kernel that is booting.
103     Ultrix boots a bit.
104     20031018 ELF symbols are now read automatically from the binary.
105     -t trace looks a bit better (string arguments are shown).
106     Trying to get initial R5900 stuff working (the 128-bit
107     CPU used in Playstation 2).
108     Fixing a minor bug to make the VFB02 (color framebuffer)
109     device work better, but it is still just 256 grayscales,
110     not real color. Ultrix can now use the framebuffer (it
111     calls it PMAX-CFB).
112     A machine can now consist of CPUs of different types.
113     Adding instructions: daddi, mov_xxx, mult_xx. The xxx
114     instructions are not documented MIPS64 instructions,
115     but NetBSD/playstation2 uses them. Perhaps VR5432
116     instructions?
117     Adding sign-extension to 32-bit mult.
118     Adding Playstation 2 devices: dmac (DMA controller),
119     gs (Graphic something?), and gif (graphics something
120     else, which has access to the PS2's framebuffer).
121     NetBSD/playstation2 works a bit, and prints a few
122     bootup messages.
123     20031020 The cpu_type field of the cpu struct now contains
124     usable values in a much better form than before. This
125     simplifies adding of new CPU types.
126     20031021 Fixing an interrupt related bug: pc_last was used, but
127     for interrupts this was incorrect. Fixed now.
128     Fixing a load/store related bug: if a load into a
129     register was aborted due to an exception, the register
130     was still modified.
131     The mc146818 rtc now reads its time from the system's
132     time() function.
133     Fixing another exception bug: if loading an instruction
134     caused an exception, something bogus happened as the
135     emulator tried to execute the instruction anyway. This
136     has been fixed now.
137     20031023 Adding a quick hack which skips "while (reg --) ;"
138     kind of loops.
139     NetBSD/pmax suddenly reached userland (!), but only
140     once and attempts to repeat it have failed. I believe
141     it is problems with my interrupt handling system.
142     20031024 Adding 8-bit color palette support to the framebuffer.
143     Connecting the pmax vdac device to the framebuffer's
144     rgb palette.
145     Fixing a bug in the dc device, so that console input
146     is possible; interaction with NetBSD/pmax's built-in
147     kernel debugger works now.
148     Symbol sizes for file formats where symbol size isn't
149     included are now calculated regardless of file format.
150     Physical memory space can now be smaller than 64 bits,
151     improving emulation speed a bit.
152     Doing other minor performance enhancements by moving
153     around some statements in critical parts of the code.
154     20031025 Minor changes to the dc device.
155     20031026 Adding support for reading symbols directly from
156     a.out files. (Works with OpenBSD/pmax binaries.)
157     Hardware devices may now register "tick functions" at
158     specific cycle intervals in a generic fashion.
159     All four channels of the dc serial controller device
160     should now work; playing around with keyboard scan
161     code generation when using the DECstation framebuffer.
162     Making various (speed) improvements to the framebuffer
163     device.
164     20031027 Playing around with the sii SCSI controller.
165     20031028 Minor fixes.
166     Adding an SGI emulation mode (-G), and some ARCBIOS
167     stuff, which SGIs seem to use.
168     Adding getbitmap() to the DEC prom emulation layer,
169     so some more -D x models become more usable.
170     Adding a dummy 'ssc' serial console device for
171     DECsystem 5400 emulation.
172     Playing around with TURBOchannel stuff.
173     20031030 Minor fixes.
174     Adding the sub instruction. (Not tested yet?)
175     Sign-extending the results of multu, addi,addiu,
176     add,addu,sub,subu,mfcZ.
177     Adding a colorplanemask device for DECstation 3100.
178     Fixed the NetBSD/pmax bug: I had forgotten to reset
179     asid_match to 0 between tlb entry checks. :-) Now
180     userland runs nicely...
181     20031031 Fixing more bugs: unaligned load/store could fail
182     because of an exception, but registers could be "half
183     updated". This has been fixed now. (As a result,
184     NetBSD/pmax can now run with any of r2000,r3000,r4000,
185     r4400, or r5000.)
186     Adding some R5K and R10000 stuff. (Note: R5K is NOT
187     R5000. Weird.)
188     Adding dummy serial console (scc) for MAXINE.
189     MAXINE also works with framebuffer, but there is no
190     color palette yet (only black and white output).
191     20031101 Moving code chunks around to increase performance by
192     a few percent.
193     The opcode statistics option (-s) now shows opcode
194     names, and not just numbers. :-)
195     Fixing the bug which caused NetBSD/pmax to refuse
196     input in serial console mode, but not in keyboard/
197     framebuffer mode: the osconsole environment variable
198     wasn't set correctly.
199     Adding DEC PROM getchar() call.
200     The transmitter scanner of the dc device now scans
201     all four channels at once, for each tick, so serial
202     output is (approximately) 4 times faster.
203     20031103 Adding a dummy BT459 vdac device, which does nothing
204     but allows a PMAG-BA turbochannel graphics card to be
205     used as framebuffer.
206     Several DECstation machines (-D 2, 3, and 4) can now
207     use TURBOchannel option card framebuffers as console,
208     for output. (Keyboard input is still not implemented
209     for those models.) Only PMAG-AA (1280x1024x8) and
210     PMAG-BA (1024x864x8), both using BT459 vdac, have
211     been tested so far.
212     Modifying the X11 routines so that several framebuffer
213     windows now can be used simultaneously (if several
214     graphics option cards are to be emulated concurrently).
215     20031104 DEC MIPSMATE 5100 (KN230) interrupts are shared
216     between devices. I've added an ugly hack to allow
217     that to work, which makes it possible to boot NetBSD
218     into userland with serial console.
219     20031106 Removing the -S (symbol) option, as symbol files can
220     now be given in any order together with other file
221     names to be loaded.
222     cookin tipped me about using (int64_t) (int32_t)
223     casts instead of manually sign-extending values.
224     Casting sometimes increases performance, sometimes
225     decreases. It's tricky.
226     Importing mips64emul into CVS.
227     20031107 Adding a generic ARC emulation mode.
228     Increasing performance of the framebuffer by not
229     updating it (or the XImage) if a write to the
230     framebuffer contains exactly what is already in it.
231     (This improves scrolling speed and initialization.)
232     Adding initial MIPS16 support.
233     Adding initial disk image support (-d command line
234     option), but this will not be used until I get some
235     kind of SCSI-controller emulation working.
236     20031108 Adding the first MIPS16 instructions: "move y,X",
237     "ld y,D(x)", and "daddiu S,K" (but the last one
238     doesn't work yet).
239     Fixing the console environment variable for
240     Enough of the 'asc' controller is now implemented
241     to let NetBSD get past scsi disk detection when
242     no disk images are used.
243     DECstation machine type 2; both serial console and
244     graphical console work now.
245     Other X-windows bit-depths than 24 bits work now,
246     but colors are still not correct in non-24 bit modes.
247     Keypresses in X framebuffer windows are now
248     translated into console keypresses. (Normal keys, but
249     not cursor keys or other special keys.)
250     20031111 Adding support for X11 using non-24-bit output.
251     20031120 Adding X11 mouse event to emulated mouse event
252     translation, but it's not tested yet.
253     Trying to get more of the SCSI controller emulation
254     to work.
255     20031124 Raw binaries can now be loaded into memory.
256     20031204 Adding srec binary support.
257     20031220 Adding some super-ugly arcbios emulation code.
258     Making some progress on the SGI and ARC machine
259     emulations.
260     20031222 SGI and ARC progress. Multiple CPUs are now added to
261     the arcbios component tree (although NetBSD cannot
262     actually use more than one).
263     20031228 Adding 'crime' and 'macepci' fake devices for SGI
264     emulation.
265     Finally implementing the cop0 'compare' register.
266     Improvements to the ns16550 device, but it is still
267     incomplete.
268     SGI userland is now reached, but interaction is broken
269     (due to the buggy ns16550).
270     20031229 Adding some more instructions: teq, dsllv
271     Adding a Nintendo 64 emulation mode (skeleton).
272     Adding R4300 and R12000 to the cpu list.
273     20031230 Adding bltzal, bltzall, bgezal, bgezall (not really
274     tested yet).
275     Fixing the 16550 serial controller device (by not
276     supporting fifo, so in fact it emulates a 16450
277     instead). This causes NetBSD/sgimips to run nicely
278     into userland, sysinst, and so on.
279     Some ARC/RD94 interrupts seem to work ok now, but
280     i/o interrupts are still not correctly implemented.
281     NetBSD/arc userland is reached and can be interacted
282     with, but there's no sysinst (?).
283     20040103 Trying to get some Irix stuff to work, but it's hard.
284     Fixing some Cobalt/linux problems.
285     20040104 Adding a dummy 8250 device, so that Linux/sgimips can output
286     console messages.
287     Adding dmultu. (The same as dmult, so I'm not sure it's correct.
288     Perhaps dmultu is correct and dmult is wrong...)
289     Fixing a bug in unaligned load/stores of 64-bit values (a cast
290     was needed).
291     Linux/sgimips in 64-bit works a bit more than before.
292     Adding simple (polled) input functionality to dev_zs.
293     Making some progress on SGI-IP22 (IP32 still works best,
294     though).
295     Fixing the mc146818 clock device in ARC/NEC and SGI emulation
296     modes, the year field was not correct.
297     Adding a fake 'pref' instruction (lwc3).
298     20040106 Separating out memory.h from misc.h.
299     Refactoring of a lot of small code fragments.
300     The PCI bus device is now shared between Cobalt, SGI, and ARC.
301     Support for RAM mirroring (dev_ram.c, not really tested yet).
302     Ugly hack to select the largest of ELF string symbol tables,
303     if there are more than one.
304     Memory hole fix for ARCBIOS, and a fix for very large (>= 4GB)
305     amounts of emulated RAM.
306     TGA (DEC 21030) PCI graphics device. NetBSD/arc can boot with
307     this card and use it as a framebuffer console.
308     20040107 Adding a fix (partly incorrect) to daddi, to allow Linux/sgimips
309     to boot in 64-bit mode.
310     20040108 Fixing a sll/nop bug (rd==0 for nop, not sa==0 as before).
311     20040109 Trying to get an SGI-IP32 PROM image to boot.
312     20040110 Faking R10000 cache things.
313     The PROM image boots, although it takes almost forever for it
314     to realize that there is no keyboard.
315     The 'gbe' SGI-IP32 graphics device works enough to display the
316     Linux framebuffer penguin in the upper left corner :-)
317     20040111 -p and -P addresses can now be given as symbol names, not just
318     numeric values.
319     Experimenting with adding a PCIIDE (dev_wdc) controller to the
320     Cobalt emulation.
321     20040120 Adding src/bintrans.c. No code yet, but this is a place for
322     ideas to be written down.
323     Increasing performance a little bit by inlining the check for
324     interrupts (which occurs for every instruction).
325     20040124 Experimenting with pure userland (syscall) emulation.
326     20040127 Fixes for compiling under Solaris.
327     20040206 Some bintrans experiments.
328     20040209 Adding some simple Ultrix userland emulation syscalls.
329     20040211 Adding decprom_dump_txt_to_bin.c to the experiments/ dir.
330     Adding a section to doc/ on how to use DECstation PROM dumps.
331     Adding a hello world example to doc/ as well.
332     20040218 TURBOchannel slots that are empty now return a DBE exception,
333     so that Ultrix and DECstation PROMs don't complain about
334     broken TURBOchannel ROMs.
335     Working some more on the machine-dependant interrupt stuff.
336     20040219 Trying out some Linux/DECstation kernels (semi-successfully).
337     20040222 YES! I finally found the bug that caused Linux/SGI-IP32 to only
338     work on Alpha, not on 32-bit machines. It was a shift left,
339     probably done using 6 bits on alpha, 5 bits on 32-bit machines.
340     20040223 Some minimal DEC KN5800 progress; Ultrix prints some boot
341     messages, detects 16 XMI R3000 cpus, and get a NULL panic.
342     It's all fake, though, the CPUs don't actually work.
343     Still, better than nothing :-)
344     20040225 An Ultrix OSF1 kernel with a ramdisk now boots :-) (It was
345     a problem with ultrixboot not giving the same arguments as
346     NetBSD's boot program.)
347     20040225(later) Fixing a bug in the DECstation dc serial device; digits 0-9
348     were translated to numeric keypad 0-9, not the normal 0-9.
349     (This caused Ultrix to print escape sequences instead of
350     digits.)
351     20040226 Some progress on machine-dependant interrupt delivery
352     for -D7 (Maxine) and -D4, and some more 'scc' serial
353     controller featuers are implemented (but no interrupts/
354     dma/keyboard/mouse stuff yet).
355     20040228 Progress on the scc controller; -D4 works in both serial
356     console mode and with keyboard (graphical console), but no
357     mouse yet.
358     20040301 SGI mace interrupts are now done using the new machine-
359     independant interrupt system.
360     20040303 Fixing an R5900 bug; the lowest 6 bits have special meaning
361     for coprocessor functions, not just 5 bits as on non-R5900
362     CPUs. (This fixes a bug which caused NetBSD to crash.)
363     20040304 Adding enough (fake) DMA capabilities to the ioasic device
364     to allow Ultrix to print boot messages in the -D3, -D4,
365     and -D7 modes, and also print graphical console messages
366     in -D4 and -D7 modes.
367     -D11 (DEC5500) polled getchar added (to the 'ssc' device).
368     Adding the 'madd' instruction (including R5900 weird stuff).
369     20040304(later) Playstation 2's GIF can now copy 640x16 pixel chunks, allowing
370     NetBSD to scroll up the framebuffer. The cursor also works
371     better now.
372     Playstation 2 bootinfo RTC data should now be passed correctly
373     to the running kernel.
374     DECstation rtc year should be either 72 or 73, anything else
375     will cause Ultrix to give a warning about invalid year.
376     20040306 Combining playstation2's dmac, interrupt, and timer devices
377     into one (ps2_stuff).
378     Adding some R5900 instructions: mfsa, mtsa, pmfhi, pmflo, por,
379     lq, and sq. (Most of them are just guesses, though.)
380     Implementing my own XImage putpixel routine, which can be
381     inlined... significantly faster than normal XPutPixel. :-)
382     20040307 Implementing the basic functionality of a "PMAG-CA" pixelstamp
383     accellerated framebuffer device. Works with NetBSD and
384     Ultrix, but no cursor or color support.
385     20040308 PMAG-CA, -DA, and -FA pixelstamps seem to work now.
386     Adding a hack to allow a pmax/mach kernel to be loaded (it's
387     a COFF file with 0 (!) sections).
388     Initial test of bt459 + framebuffer cursor support.
389     20040309 Fixes/updates of dev_dec5800 and dev_ssc (and dev_decxmi) allow
390     a KN5800 Ultrix-OSF1-ramdisk kernel to boot all the way into
391     userland and be interacted with.
392     The bt459 cursor should now look semi-nice, but it is still
393     a bit fake.
394     20040310 Moving the DEC CCA stuff from src/machine.c into a separate
395     device file (devices/dev_deccca.c).
396     An ugly hack added to allow some more OSF/1 kernels (almost
397     a.out, but without many of the header fields) to load.
398     20040314 Adding PMAG-JA and PMAG-RO (1280x1024 x 8-bit) TURBOchannel
399     graphics devices. They work in Ultrix, but only monochrome
400     and no cursor, because there are no ramdacs or such yet.
401     20040315 Pixelstamp solid fill now supports colors other than just
402     zero-fill.
403     Adding a (new) regression test skeleton.
404     20040321 Some really minor updates.
405     20040323 Fixes to allow SGI-IP20 and IP22 to work a bit better
406     (aliased memory), and adding "private" firmware-like vectors
407     to arcbios emul. An IP22 Irix kernel gets far enough to
408     print an assertion warning (and then double panics). :-)
409     20040324 Adding a generalization hack to the SCC serial controller
410     to work with SGI-IP19 (in addition to DECstations).
411     Adding the 'sdc1' instruction.
412     Some progress on various SGI emulation modes.
413     20040325 Minor updates.
414     20040326 Fixed a 'madd' bug (r5900). NetBSD/playstation2 now reaches
415     userland correctly. And a simple fix which allows NetBSD
416     timer interrupts to be triggered; NetBSD uses T_MODE_CMPE
417     (compare), while Linux uses _OVFE (overflow).
418     20040328 Linux on Playstation 2 boots a bit. The Playstation 2
419     graphics controller has been extended to work better with
420     NetBSD, and to include some Linux support as well.
421     Some interrupt handling enhancements on Playstation 2,
422     needed for Linux' dma.
423     128-bit loads and stores (lq and sq) are allowed, although
424     the top half of quadwords are not modified by other
425     instructions. (Linux uses lq and sq.)
426     Big-endian X Windows servers now display correct rgb color,
427     not bgr as before.
428     20040330 Some minor updates to the documentation.
429     20040401 Adding a dummy ps2 OHCI device.
430     20040402 Progress on the asc SCSI controller.
431     20040406 Hack to allow ./configure, make to work on HP-UX B.11.00
432     on HPPA-RISC, gcc 3.3.2. (Does not work with HP's cc.)
433     More progress on the asc SCSI controller. Fixing INQUIRY,
434     adding READ_CAPACITY, adding READ. Works a bit with NetBSD
435     and some (but not all) Ultrix kernels, on DECstation type 2.
437     Mounting disks works in NetBSD :-) It is a bit buggy,
438     though. Or something else is buggy.
439     20040407 The bug is triggered by gunzip during NetBSD/pmax install.
440     20040408 Fixing a bug (non-nul-terminated string) which caused X11
441     cursors to not display on Solaris.
442     Unnecessary X11 redraws are skipped (removes some weird
443     delays that existed before), and cursors are redrawn on
444     window exposure. (The cursor functionality has been moved
445     from dev_fb.c to x11.c.)
446     20040411 Fixing the DC7085 device so that Ultrix doesn't behave weird
447     if both tx and rx interrupts occur at the same time.
448     More advancements on the asc SCSI controller.
449     More disk image filename prefixes are now recognized; c (for
450     CD-ROM, as before), d for disk, b for boot device, r for
451     read-only, and 0-7 for scsi id.
452     Mounting disks works in Ultrix. Installing to disk usually
453     crashes for various reasons, but an OSF/1 install gets
454     relatively far (similar to the NetBSD/pmax install).
455     20040412 Trying to find the bug.
456     20040415 Finally found and fixed the bug; SCSI reads and writes
457     (actually, any data in or data out) can be split up into
458     multiple DMA transfers. That stuff was only partially
459     implemented, and the part that was implemented was buggy.
460     It works now. NetBSD/pmax and Ultrix 4.3 seems to like
461     the SCSI stuff enough to install almost all the way.
462     20040415 (more) Adding a hack which allows a host's cdrom device to be used as
463     a cdrom device inside the emulator, eg /dev/cd0c.
464     Making the cycle counter int64_t instead of long, as a 'long'
465     overflows too easily on 32-bit machines. (The bug is still
466     there, though.)
467     I've now verified that a full NetBSD/pmax install can be done.
468     If using a PMAG-AA graphics board, startx brings up X :-)
469     mips64emul can be compiled inside NetBSD inside mips64emul,
470     and it can run NetBSD in that environment. (I'm getting
471     dizzy... :-)
472     20040417 Moving some coprocessor stuff from cpu.c to coproc.c.
473     20040424 Adding a BT455 vdac for PMAG-AA. Black and white are now
474     rendered correctly in Xpmax.
475     Adding colormap support to the BT459 device, for PMAG-BA.
476     20040425 Fixing a buffer length bug, which caused an Ultrix 4.5
477     install to bug out on an i386 host.
478     20040429 FPU experiments.
479     20040502 More FPU experiments.
480     Speedup for exception debug messages: in quiet mode, debug
481     messages were still evaluated, which took a relatively
482     large amount of time.
483     20040503 Most FPU stuff fixed, but there is at least one known bug
484     left; ps axu in NetBSD triggers it (ps loops forever).
485     20040504 A default install of Ultrix 4.5 succeeded! It boots up with
486     a graphical login.
487     Fixing the keyboard repetition bug (a lk201 "up" (release)
488     scancode is now sent after every key).
489     20040505 Both CR and LF now produce the same lk201 scancode, so that
490     pressing 'enter' works as expected in Ultrix.
491     20040506 Adding a vaddr to paddr translation cache, causing a speedup
492     of perhaps 50% or more.
493     20040507 Fixing PMAG-BA color for Ultrix. (Ultrix relies on interrupts
494     coming from the TURBOchannel slot to update the palette.)
495     20040508 Fixing cursor positioning for PMAG-BA.
496     20040511 Prints current nr of instructions per seconds, not only
497     average, when using -N.
498     20040515 Some more bintrans experiments.
499     20040606 Adding ARCBIOS GetReadStatus() and Read().
500     Adding some instructions: tlt, tltu, tge, tgeu, tne.
501     20040607 Adding the dsub instruction.
502     Some minimal progress on SGI-IP30 emulation.
503     Applying a patch from Juli Mallett to src/file.c (I'm not
504     sure yet if it breaks or fixes anything).
505     Some minor fixes for SGI-IP22 (such as faked board revision
506     numbers).
507     20040608 ll/sc should now fail if any unrelated load/store occurs.
508     Minor changes to the configure script.
509     Adding some ifdefs around code which is not often used
510     (the mfhi/mflo delay, and the last_used TLB experimental
511     code); this might cause a tiny speedup.
512     20040609 Minor fixes.
513     20040610 Various minor SGI fixes (64-bit ARCS stuff, progress on the
514     CRIME/MACE interrupt system, and some other random things).
515     20040611 More crime/mace progress, and some more work on pckbc.
516     KN5800 progress: adding a XMI->BI adapter device; a disk
517     controller is detected (but it is just a dummy so far).
518     20040612 Adding "dev_unreadable", which simplifies making memory
519     areas unreadable. (NetBSD on SGI-IP22 no longer detects
520     non-existant hpc1 and hpc2 busses.)
521     Implementing rudimentary support for IP22 "local0" and
522     "local1" interrupts, and "mappable" local interrupts.
523     Some progress on the WDSC SCSI controller on IP22, enough
524     to let NetBSD get past the disk detection and enter
525     userland! :-)
526     The zs (zilog serial) device now works well enough to let
527     NetBSD/sgimips be interacted with on IP22. :-) (Though
528     it is very ugly and hardcoded.)
529     20040613 IP32 didn't work last night, because there were too many
530     tick functions registered. That has been increased now.
531     Trying out NetBSD/sgimips 2.0 beta kernels. There are some
532     differences compared to 1.6.2, which I'm trying to solve.
533     Interrupt fixes for IP32: _serial and _misc are different.
534     Separation of IP22 (Full-house) and IP24 (Guiness).
535     20040614 Modifying the memory layout for IP20,22,24,26 (RAM is now
536     offset by 128MB, leaving room for EISA registers and such),
537     and moving around some code chunks. This is not well
538     tested yet, but seems to work.
539     Moving parts of the tiny translation cache, as suggested
540     by Juli Mallett. It seems that the speedup isn't as
541     apparent as it was a few weeks ago, though. :-(
542     Speedups due to not translating addresses into symbol
543     names unless the symbol name is actually printed.
544     Added support for loading old big-endian (Irix) ECOFF
545     kernels (0x60 0x01 as the first two bytes).
546     20040615 (late) Adding enough SGI IP20 (Indigo) support to let NetBSD 2.0
547     enter userland :-) No interrupt specifics are implemented
548     yet, so it hangs while doing terminal output.
549     20040618 Experimenting with the WDSC SCSI controller for IP20,22,24.
550     20040620 Adding a program which converts SGI prom dumps from text
551     capture to binary, and some hacks to try to make such an
552     IP22 PROM to work better in the emulator.
553     20040621 Removing the Nintendo 64 emulation mode, as it is too
554     uninteresting to support.
555     Adding SCSI tape device support (read-only, so far).
556     Fixing a bug which caused the cursor to be corrupted if new
557     data was written to the framebuffer, but the cursor wasn't
558     moved.
559     20040622(early) Finally! Making progress on the SCSI tape stuff; when going
560     past the end of a file, automagically switch to the beginning
561     of the next.
562     20040622(late) Trying to track down the last SCSI tape bugs.
563     Removing _all_ dynamic binary translation code (bintrans),
564     starting from scratch again.
565     20040623(early) Performing a general code cleanup (comments, fixing stuff
566     that led to compiler warnings, ...).
567     Disabling MIPS16 support by default, and making it a
568     configure time option to enable it (--mips16). This gives
569     a few percent speed increase overall.
570     Increasing performance by assuming that instruction loads
571     (reading from memory) will be at the same page as the last
572     load. (Several percent speedup.)
573     Moving the list of kernels that can be found on the net from
574     README to doc/.
575     20040624 Finally! I found and fixed the bug which caused 'ps', 'top',
576     'xclock', and other programs in NetBSD/pmax to behave weird.
577     Increasing performance by a few percent by running as many
578     instructions in a row as possible, before checking for
579     hardware ticks.
580     When booting from SCSI tapes on DECstation, the bootstring
581     now contains 'tz' instead of 'rz'.
582     Adding a second ARC machine mode, "Acer PICA-61", -A2.
583     Disabling the support for "instruction delays" by default
584     (it has to be enabled manually in misc.h now, but is never
585     used anywhere anyway).
586     Other minor optimizations (moving around stuff in the
587     cpu struct in misc.h, and caching cpu->pc in cpu.c).
588     Separating the tiny translation cache into two, one for
589     code and one for data. This gives a few percent speed
590     increase.
591     20040625(early) I think now is a good time for a "feature freeze",
592     to let the code stabilize and then make some kind of
593     first release.
594     20040625(later) Adding a -v (verbose) command line option. If -v is not
595     specified, the emulator goes into -q (quiet) mode just before
596     it starts to execute MIPS code.
597     20040627 The configure script now adds -fomit-frame-pointer to the
598     compile flags if the $CC seems to be able to handle that.
599     Found and fixed a serious interrupt bug in BT459 (Ultrix'
600     behaviour required a hack, which was incorrect), so
601     performance for machines using the PMAG-BA framebuffer is
602     now improved.
603     For X11 bitdepths other than 8 or 24, a warning message
604     is printed at startup.
605     A number of other minor fixes, optimizations, updated
606     comments and so on.
607     Adding a BUGS file, a list of known bugs.
608     Adding a minimal man page, doc/mips64emul.1.
609     20040628 Hacks for faking the existance of a second level cache
610     (ARCBIOS and other places).
611     An important fix for dc7085: tx interrupts should happen
612     before rx interrupts, not the other way around as it was
613     before. (This speeds up NetBSD boot on DECstation, and
614     fixes a bug which Ultrix triggered on heavy keyboard input.)
615     A couple of other minor fixes.
616     Framebuffer fix: there was a bug which caused the rightmost/
617     bottom pixel to sometimes not be updated, when running in
618     scaledown mode. This is now fixed.
619     Adding a small program which removes "zero holes" from
620     harddisk image files.
621     20040629 More minor fixes.
622     20040629(later) Adding -A3 (NEC RISCstation 2200) (this is similar to
623     the 2250 model that NetBSD/arc can already boot all the
624     way into userland and be interacted with), and -A4
625     (Deskstation Tyne).
626     Some more minor fixes.
627     20040630 Adding support for 15 and 16 bits X11 framebuffers,
628     and converting from XYPixmap to ZPixmap (this fixes the
629     problem of updates appearing in "layers" on some X
630     servers).
631     The pixels in the mouse cursor (for BT459) are now colored
632     as the emulated OS sets them, although no transparency
633     masking is done on the edges of the cursor yet. (In plain
634     English: the mouse cursor is no longer just a white solid
635     square, you can actually see the mouse cursor image
636     on the white square.)
638     ============== RELEASE 0.1 ==============
640     20040701 The -j option now takes a name, the of the kernel as passed
641     on to the bootloader. ("netbsd" is the default name.)
642     Adding support to load bootstrap code directly from a disk
643     image, for DECstation. Both NetBSD/pmax and Ultrix boot
644     straight of a disk image now, with no need to supply a
645     kernel filename on the command line. (Ultrix still needs
646     -j vmunix, though, to boot from /vmunix instead of /netbsd.)
647     20040702 Minor bugfix (some new untested code for X11 keypresses was
648     incorrect).
649     20040702(later) Adding an ugly hack for CDROMs in FreeBSD; if an fread() isn't
650     done at a 2048-byte aligned offset, it will fail. The hack
651     tries to read at 2048-byte aligned offsets and move around
652     buffers to make it work.
653     Adding video off (screen blanking) support to BT459.
655     ============== RELEASE 0.1.1 ==============
657     20040702(later) Cleanup to remove compiler warnings (Compaq's cc, Solaris' cc,
658     and gcc 3.3.3/3.3.4 in Linux), mostly by putting ULL on large
659     numeric constants.
660     Better support for scaledown of BT459 cursors, but still not
661     color-averaging.
662     Beginning the work on adding better memory latency support
663     (instruction delays), enabled by the --delays configure option.
664     20040703 Modifications to the configure script so that a config.h file
665     is created, containing things that were passed along as
666     -Dxxx on each cc command line before.
667     More work on instruction latency support; trying to separate
668     the concepts of nr of cycles and nr of instructions.
669     20040704 Working on R2000/R3000 caches.
670     Adding a '--caches' option to the configure script.
671     Various small optimizations.
672     R3000 caches finally work. (I know that there is at least one
673     bug, regarding interrupt response.)
674     20040705 Working on the 'le' device, and on a generic (device
675     independant) networking framework. le can transmit and receive
676     packets, and the network framework fakes ARP responses from a
677     fake gateway machine (at a fixed ip address,
678     Adding a '-c' command line option, which makes emulated_hz
679     automatically adjust itself to the current number of emulated
680     cycles per host CPU second (measured at regular intervals).
681     20040707 Removing the '-c' option again, and making it the default
682     behaviour of the emulator to automatically adjust clock
683     interrupts to runtime speed (as long as it is above 1 MHz).
684     (This can be overridden by specifying a static clock rate with
685     the -I option.)
686     Updating the doc/ stuff a bit.
687     Generalization of the DECstation bootblock loading, to work
688     with Sprite/pmax. Lots of other minor modifications to make
689     Sprite work, such as adding support for DECstation "jump table"
690     PROM functions, in addition to the old callback functions.
691     Sprite boots from a disk image, starting the kernel if the
692     argument "-j vmsprite" is used, but it seems to not like the
693     DBE exceptions caused by reading empty TURBOchannel slots. :-/
694     20040708 Minor changes and perhaps some tiny speed improvements.
695     The Lance chip is (apparently) supposed to set the length of
696     received packets to len+4. (I've not found this in any
697     documentation, but this is what NetBSD expects.) So now, ICMP
698     echo replies work :-) UDP works in the outgoing direction,
699     in the incoming direction, tcpdump can see the packets but they
700     seem to be ignored anyway. (Weird.)
701     Adding a separate virtual-address-to-host-page translation
702     cache, 1-entry for loads, 1-entry for stores. (For now, it
703     only works on R4000 as there are conflicts with cache usage
704     on R3000).
705     Changing the lower clock speed bound from 1 MHz to 1.5 MHz.
706     20040709 Incoming UDP checksums were wrong, but are now set to zero
707     and NetBSD inside the emulator now accepts the packets (eg.
708     nameserver responses). Host lookups and even tftp file
709     transfers (using UDP) work now :-)
710     Adding a section on Networking to the Technical documentation,
711     and a preliminary NetBSD/pmax install instruction for network
712     installs to the User documentation.
713     Some updates to the man page.
714     20040709(later) Fix to the TURBOchannel code to allow Sprite to get past the
715     card detection. Seems to still work with Ultrix and NetBSD.
716     This also makes Linux/DECstation properly recognize both the
717     Lance controller and the SCSI controller. Linux 2.4.26 from
718     Debian boots nicely in framebuffer mode :-)
719     20040710 Some bits in the KN02 CSR that were supposed to be readonly
720     weren't. That has been fixed, and this allows Linux/DECstation
721     to get past SCSI detection. :-)
722     Minor updates to the ASC controller, which makes Linux and
723     OpenBSD/pmax like the controller enough to be able to access
724     SCSI devices. OpenBSD/pmax boots from a disk image for the
725     first time. :-) Linux detects SCSI disks, but I have no
726     bootable Linux diskimage to test this with.
727     Updating the doc/ to include instructions on how to install
728     OpenBSD/pmax onto a disk image.
729     Naively added a PMAGB-BA (1280x1024x8) in hopes that it would
730     basically be a PMAG-BA (1024x864x8) in higher resolution,
731     but it didn't work that way. I'll have to look into this later.
732     Adding a -o option, useful for selecting '-s' (single user
733     mode) during OpenBSD install and other things.
734     After a lot of debugging, a serious bug related to the tiny
735     cache was found; Linux just changes the ASID and returns when
736     switching between processes in some occasions without actually
737     _writing_ to the TLB, and I had forgotten to invalidate the
738     tiny cache on such a change.
739     20040711(early) I've been trying to repeat the OpenBSD install from yesterday,
740     but appart from the first initial install (which was
741     successful), I've only been able to do one more. Several
742     attempts have failed with a filesystem panic in the middle
743     of install. I'm not sure why.
744     20040711 I found the "bug": wget downloaded the simpleroot28.fs.gz file
745     as read-only, and gunzip preserved those flags. Thus, OpenBSD's
746     installer crashed as it didn't get its writes through to the
747     disk.
748     Parts of the 1280x1024x8 PMAGB-BA graphics card has been
749     implemented, it works (unaccelerated) in NetBSD and OpenBSD,
750     but Ultrix does not seem to like it.
751     Cleaned up the BT459 cursor offset stuff a bit.
752     Trying to make the emulated mouse coordinates follow the host's
753     mouse' coordinates (for lk201, DECstation), by
754     "de-accelerating" the data sent to the emulated OS.
755     20040711(later) Fix so that Sprite detects the PMAG-BA correctly.
756     Adding some stuff about NFS via UDP to the documentation.
757     Fixed the 'update flag' for seconds, so now Sprite doesn't
758     crash because of timer-related issues anymore.
759     Fixing KN02 interrupt masks a bit more, to make Sprite not
760     crash. Sprite now runs quite well.
761     20040712 Working on IP/UDP fragementation issues. Incoming UDP packets
762     from the outside world can now be broken up into fragments
763     for the guest OS. (This allows, for example, OpenBSD/pmax to
764     be installed via nfs.) Outgoing fragmented packets are NOT
765     yet handled.
766     Linux doesn't use 64-bit file offsets by default, which is
767     needed when using large disk images (more than 2GB), so the
768     configure script has now been modified to add necessary
769     compiler flags for Linux.
770     20040713 Trying out some minor optimizations.
771     Refreshing the UDP implementation in src/net.c a little.
772     20040714 Updating the documentation a little on how to experiment
773     with a Debian Linux install kernel for DECstations.
774     A 'mini.iso' Linux image for DECstation has different fields
775     at offsets 0x10 and 0x14, so I'm guessing that the first is
776     the load address and the second is the initial PC value.
777     Hopefully this doesn't break anything.
778     Some initial TCP hacks, but not much is working yet.
779     Some updates for IP30: The load/store 1-entry cache didn't
780     work too well with IP30 memory, so it's only turned on for
781     "MMU4K" now. (This needs to be fixed some better way.)
782     Adding a hack which allows Linux/Octane to use ARC write()
783     and getchild() on IP30. Linux uses ARCBIOS_SPB_SIGNATURE as a
784     64-bit field, it was 32-bit before.
785     Making ugly hacks to the arcbios emulation to semi-support
786     64-bit equivalents of 32-bit structures.
787     20040716 Minor fixes to the configure script (and a few other places)
788     to make the sources compile out-of-the-box on HP-UX (ia64
789     and HPPA), old OpenBSD/pmax (inside the emulator itself), and
790     Tru64 (OSF/1) on Alpha.
791     A couple of other minor fixes.
792     20040717 A little TCP progress; OpenBSD/pmax likes my SYN+ACK replies,
793     and tries to send out data, but NetBSD/pmax just drops the
794     SYN+ACK packets.
795     Trial-and-error led me to change the 64-bit ARCS component
796     struct again (Linux/IP30 likes it now). I'm not sure about all
797     of the offsets yet, but some things seem to work.
798     More 64-bit ARCS updates (memory descriptors etc).
799     Better memory offset fix for IP30, similar to how I did it for
800     IP22 etc. (Hopefully this doesn't break anything else.)
801     Adding a MardiGras graphics controller skeleton for SGI-IP30
802     (dev_sgi_mardigras.c).
803     Thanks to Stanislaw Skowronek for dual-licensing mgras.h.
804     Finally rewrote get_symbol_name() to O(log n) instead of O(n)
805     (Stanislaw's Linux kernel had so many symbols that tracing
806     with the old get_symbol_name() was unbareably slow).
807     Removing all of the experimental tlbmod tag optimization code
808     (the 1-entry load/store cache), as it causes more trouble than
809     the performance gain was worth.
810     20040718 The MardiGras device works well enough to let Linux draw the
811     SGI logo and output text.
812     A bunch of other minor changes.
813     20040719 Trying to move out all of the instruction_trace stuff from the
814     main cpu loop (for two reasons: a little performance gain,
815     and to make it easier to add a GUI later on).
816     20040720 Finally found and fixed the ethernet/tcp bug. The hardware
817     address is comprised of 6 bytes, where the _first_ byte should
818     have a zero as the lowest bit, not the last byte. (This causes
819     NetBSD and Linux running in the emulator to accept my SYN+ACK
820     packets.)
821     Getting the first nameserver address from /etc/resolv.conf.
822     (This is not used yet, but could be useful if/when I add
823     internal DHCP support.)
824     Working more on the TCP stuff; TCP seems to be almost working,
825     the only immediate problem left is that the guest OS gets
826     stuck in the closing and last-ack states, when it shouldn't.
827     It is now possible to install NetBSD and OpenBSD via ftp. :-)
828     20040721 Trying to fix the last-ack bug, by sending an RST after the
829     end of a connection. (Probably not a correct fix, but seems
830     to work?)
831     Adding a my_fseek() function, which works like fseek() but
832     with off_t instead of long, so that large disk images can
833     be used on systems where long is 32 bits.
834     20040722 Trying to fix some more TCP related bugs.
835     20040725 Changing the inlined asm statement in bintrans_alpha.c into
836     a call to a hardcoded array of bytes that do the same thing
837     (an instruction cache invalidation). This allows the same
838     invalidation code to be used regardless of compiler.
839     Some other minor changes.
840     20040726 Minor updates. The configure script is now more verbose.
841     A Debian/IP22 Linux tftp boot kernel requires ARCS memory to
842     be FreeMemory, not FreeContiguous. (This should still work with
843     other SGI and ARC OSes.)
844     Fix for ARCS write(), so it returns good write count and
845     success result (0).
846     Some hacks to the IP22 memory controller, to fake 72MB RAM
847     in bank 0.
848     The IP22 Debian kernel reaches userland (ramdisk) when run
849     with -G24 -M72 -CR4400, if a special hack is done to the
850     zs device.
851     20040730 Removing mgras.h, as I'm not sure a file dual-licensed this way
852     would work. (Dual-licensing as two separate files would work
853     though.)
854     Preparing for the upcoming release (0.2).
855     20040801 Fixing the 512 vs 2048 cdrom sector size bug; I hadn't
856     implemented the mode select SCSI command. (It still isn't
857     really implemented.)
858     A bug which crashes the emulator is triggered when run with
859     new NetBSD 2.0_BETA snapshots on a Linux/i386 host. I'm not
860     sure why.
861     UDP packets sent to the gateway (at are now
862     forwarded to the machine that the host uses as its nameserver.
863     Some other minor fixes.
865     ============== RELEASE 0.2 ==============
867     20040803 A post-3.5 OpenBSD/sgimips kernel snapshot with ramdisk seems
868     to boot fine in the emulator, all the way to userland, and
869     can be interacted with.
870     Adding a -y option, used to set how many (random) instructions
871     to run from each CPU at max (useful for SMP instruction
872     interleave experiments).
873     Importing a 8x16 console font from FreeBSD (vt220l.816).
874     Adding a skeleton for a 80x25 text console device (dev_vga),
875     useful for some ARC modes. (Character output is possible, but
876     no cursor yet.)
877     Adding a dev_zero device (returns zeroes on read).
878     OpenBSD/arc 2.3 can get all the way to userland with -A4 (if
879     the wdc devices are commented out) but bugs out there, probably
880     because of interrupt issues.
881     Adding a -A5 ARC emulation mode (Microsoft-Jazz, "MIPS Magnum")
882     which NetBSD seems to like. No interrupt specifics yet, so
883     it hangs while waiting for SCSI.
884     20040804 Some dev_mp updates.
885     The -y switch has to do with number of cycles, not number
886     of instructions; variable names have been changed to reflect
887     this.
888     20040805 Minor updates. Adding some more CPU types/names, but they
889     are probably bogus.
890     Adding a MeshCube emulation mode. Just a skeleton so far, but
891     enough to let a Linux kernel print some boot messages.
892     Adding the 'deret' instruction.
893     20040806 Adding include/impactsr-bsd.h (a newer version of what was in
894     mgras.h before, and this time with only a BSD-style license),
895     but it is not used yet.
896     20040810 Some Au1500 updates.
897     20040811 Adding the 'clz', 'clo', 'dclz', and 'dclo' special2 (MIPS32
898     and MIPS64) instructions.
899     More Au1500 updates.
900     20040812 Using fseeko(), when it is available.
901     Other minor updates.
902     Adding a NetGear WG602 emulation mode skeleton (-g); after
903     a lot of trial and error, a Linux kernel (WG602_V1715.img)
904     gets all the way to userland, but hangs there.
905     20040818 Adding signal handlers to better cope with CTRL-Z and CTRL-C.
906     Adding a simple interactive single-step debugger which is
907     activated by CTRL-C. (Commands so far: continue, dump, help,
908     itrace, quit, registers, step, trace, version)
909     20040818(later) Adding a 'tlbdump' debugger command, and some other minor
910     fixes.
911     20040819 Minor updates. Adding an 'unassemble' debugger command.
912     20040822 Minor updates to the regression testing framework.
913     20040824 Minor updates based on feedback from Alec Voropay
914     (configure script updates for Cygwin and documentation).
915     20040826 Minor updates.
916     Adding a cursor to the VGA text console device.
917     Changing all old 11:22:..55:66 ethernet macs to 10:20..60,
918     still hardcoded though.
919     20040828 Minor updates.
920     20040829 mips64emul is 1 year old today :-)
921     20040901 tests/README now lists "all" MIPS opcodes. This list should
922     be updated whenever a new opcode is implemented, or when a
923     regression test is added. (A combination of instructions from
924     the TX79 manual, the GNU assembler, and the MIPS64 manual).
925     Hopefully I haven't missed too many.
926     Adding a section on regression testing to doc/technical.html.
927     20040902 Finally beginning the work on separating out the stuff from
928     main.c into a "struct emul". Very time-consuming.
929     Some minor fixes for LL/SC on R10000.
930     20040905 Moving more stuff from main.c into struct emul. Unfortunately,
931     it seems that this causes a slowdown of the emulator.
932     Userland emulation is now only used if --userland is used
933     when running configure.
934     Modifying src/symbol.c to not use global variables.
935     20040906 Minor update.
936     20040914 Using $COPTIM when detecting which compiler flags to use in
937     the configure script. (This makes sure that combinations of
938     flags should work.)
939     There'll probably be a 0.2.1 release some time soon, but I'll
940     do some more clean-up first.
941     Minor update to the detection of ECOFF files, but I don't like
942     it; sometimes the endianness of the magic value seems to be
943     swapped, but it doesn't have to do with endianness of the
944     actual data?
945     20040916 Minor updates. Adding an Example section to the manpage, but
946     as I'm not really familiar with manpage formatting, it will
947     need to be rewritten later.
948     20040917 Finally making the coprocessor instructions disassemblable
949     even when not running.
950     Doing some testing for the 0.2.1 release.
952     ============== RELEASE 0.2.1 ==============
954     20040923 Updating the documentation about how to (try to) install
955     Debian GNU/Linux.
956     20040924 Some more updates to the documentation.
957     20040925 Adding overflow stuff to 'add' and 'sub'.
958     20040926 Minor updates: possibly a fix to 'sltiu' (the imm value
959     should be treated as signed, and then converted to unsigned,
960     according to the MIPS64 manual), and removing the
961     'last_was_rfe' stuff (again).
962     OpenBSD/arc used speed-hack jumps with other deltas than just
963     +/- 1 (it used -3 iirc), so the jump speedhack should now
964     support any delta. Also adding bgtzl and blezl as possible
965     instructions for the speed-hack jumps. (This needs to be
966     tested more.)
967     20040928 Minor updates. Some ARC stuff ("arcdiag" runs now).
968     cpu_register_dump() now also dumps coprocessor registers.
969     20040929 More ARC updates. Making the code look a tiny bit nicer
970     than before. "arcdiag.ip22" works for -G22 (SGI-IP22).
971     Apparently the overflow support in the 'add' instruction
972     was incorrect, so I disabled it.
973     20041002 Trying to install Ultrix in the emulator, but the installer
974     crashes; found (and fixed) the bug rather quickly: the "fix"
975     I implemented a few days ago for the 'sub' instruction
976     (according to the MIPS64 manual) caused the bug.
977     20041004 Changing the behaviour of the -j command line option. The
978     default is now "" (or taken from the last filename given on
979     the command line), not "netbsd". In practice, this doesn't
980     change much, except that -j netbsd.pmax is no longer needed
981     when installing NetBSD.
982     Adding a COMPILE_DATE string to config.h.
983     20041007 Adding a NEC RISCserver 4200 model (-A6), and some more
984     updates to the ARC component tree generator.
985     20041008 The 'll' instruction should be signed, not unsigned as before.
986     This (and some other minor fixes) causes Irix on SGI-IP32 (O2)
987     to actually boot far enough to print its first boot messages :)
988     Working on some new dynamic bintrans code. Enough is now
989     implemented so that the 'nop' instruction is translated
990     and there is support for Alpha, i386 and UltraSparc backends,
991     but performance is about 50% worse than when running without
992     bintrans. (This is as expected, though.)
993     20041009 Minor updates to the documentation.
994     Using mprotect() to make sure that the code created dynamically
995     by the bintrans subsystem is allowed to be executed. (This
996     affects newer OpenBSD systems, and possibly others.)
997     The translated code chunks now only get one argument passed to
998     them, the (struct cpu *) of the current cpu.
999     20041010 Hack to dev_le.c which makes Ultrix accept the initialization
1000     of the LANCE controller. (This goes against the LANCE
1001     documentation though.)
1002     In src/net.c, a fix for Ultrix (which seems to send larger
1003     ethernet packets than the actual TCP/IP contents). The hack to
1004     dev_le.c and this fix is enough to let Ultrix access the
1005     Internet.
1006     For DECstation, when booting without a disk image (or when
1007     "-O" is used on the command line), use "tftp" instead of "rzX"
1008     for the boot string.
1009     20041011 Adding cache size variables to the emul struct, so that these
1010     can be set on a per-machine basis (or potentially manually
1011     on the command line).
1012     20041012 Mach/PMAX now passes the LK201 keyboard self-test (although
1013     the keyboard ID is still bogus).
1014     20041013 Minor updates.
1015     Hacks to the ASC SCSI controller for Mach/PMAX, hopefully this
1016     will not break support for other OSes.
1017     20041014 Minor fix to src/emul.c for reading bootblocks at the end of
1018     a disk or cdrom image (thanks to Alexandru Lazar for making me
1019     aware of this).
1020     Adding "gets()" to src/dec_prom.c.
1021     Working a bit on ARC stuff. Importing pica.h from NetBSD.
1022     Minor updates to the ARC component tree for PICA-61.
1023     Adding a dev_jazz.c (mostly for PICA-61).
1024     Renaming dev_jazz.c into dev_pica.c. Working on PICA timer
1025     and interrupt specifics.
1026     20041016 Adding some dummy entries to lk201.c to reduce debug output.
1027     Some bintrans updates (don't run in delay slots or nullified
1028     slots, read directly from host memory and not via memory_rw(),
1029     try mmap() before malloc() at startup, and many other minor
1030     updates).
1031     Adding bintrans_mips.c for 64-bit MIPS hosts, but it is not
1032     used yet.
1033     20041017 Minor updates.
1034     20041018 Update to dev_mc146818 to allow Mach to boot a bit further.
1035     The "hardware random" in dev_mp.c now returns up to 64 bits
1036     of random.
1037     20041019 Minor updates to the way cache sizes are used throughout the
1038     code. Should be mostly ok for R[234]x00.
1039     src/file.c now loads files using NO_EXCEPTIONS. Whether this
1040     is good or bad, I'm not sure.
1041     20041020 Adding a Linksys WRT54G emulation skeleton (-H).
1042     20041021 Minor updates.
1043     R1[024]000 cache size bits in the config register should now
1044     be ok.
1045     Trying to make dev_asc.c work better with PICA.
1046     More work on PICA interrupts (but they are broken now).
1047     20041022 Generalizing the dev_vga text console device so that it can be
1048     used in other resolutions than just 80x25. Works with
1049     OpenBSD/arc.
1050     emul->boot_string_argument is now empty by default (except
1051     for DECstation modes, where it is "-a").
1052     Speedup of dev_ram by using mmap() instead of malloc().
1053     Using mmap() in memory.c as well, which reduces memory usage
1054     when emulating large memory sizes if the memory isn't actually
1055     written to.
1056     20041023 Minor updates.
1057     20041024 Updates to the PC-style keyboard controller, used by PICA.
1058     Updates to the PICA (Jazz) interrupt system. Both NetBSD/arc
1059     and OpenBSD/arc now reach userland with PICA emulation, and
1060     can be interacted with (there are a few programs on the
1061     INSTALL kernel ramdisks). In the case of OpenBSD, a VGA text
1062     console and PC-style keyboard controller is used, NetBSD
1063     runs on serial console.
1064     Adding a framework for DMA transfer for the ASC SCSI
1065     controller.
1066     Implementing a R4030 DMA controller for PICA, enough to let
1067     OpenBSD/arc and NetBSD/arc be installed on an emulated
1068     Pica. :-)
1069     Updates to the documentation.
1070     20041025 Working on ISA interrupts for PICA.
1071     Adding an Olivetti M700 emulation mode (-A7).
1072     Better separation of PICA and M700 stuff (which I accidentally
1073     mixed up before, I thought the M700 Linux kernel would
1074     also work on PICA because it almost booted).
1075     Writing a skeleton G364 framebuffer for M700, enough to show
1076     the Linux penguin and some text, although scrolling isn't
1077     correctly implemented yet.
1078     Adding a dummy SONIC (ethernet) device, dev_sn, for PICA.
1079     Fixing the passing of OSLOADOPTIONS for ARC, the default is
1080     now "-aN" which works fine with OpenBSD/arc and NetBSD/arc.
1081     20041027 Minor updates.
1082     20041029 Adding a Sony NeWS "newsmips" emulation mode skeleton (-f).
1083     Found and fixed a bug which prevented Linux/IP32 from running
1084     (the speed-hack-jump-optimization fix I made a few weeks ago
1085     was buggy).
1086     Adding the trunc.w.fmt and trunc.l.fmt instructions, although
1087     the are probably not really tested yet.
1088     Changes to how floating point values are handled in
1089     src/coproc.c, but right now it is probably very unstable.
1090     20041101 I had accidentally removed the instructions on how to install
1091     Ultrix from doc/index.html. They are back now.
1092     Adding a -Z option, which makes it easier to run dual- or
1093     tripple-head with Ultrix. (Default nr of graphics cards
1094     without -X is 0, with -X is 1.)
1095     Minor update which makes it possible to switch to the left
1096     monitor when running tripple-head, not just right as before.
1097     When using more than one framebuffer window, and the host's
1098     mouse cursor is in a different window than the emulated mouse
1099     cursor, the emulated mouse will now try to move "very far",
1100     so that it in practice changes screen.
1101     Running Ultrix with dual- and tripple-head now feels really
1102     great.
1103     20041101(later) OpenBSD/arc and Linux/Olivetti-M700 don't both work at the
1104     same time with the speed-hack stuff. So, from now on, you
1105     need to add -J for Linux, and add nothing for openbsd.
1106     20041102 Minor update for OSF/1 V4.0 (include sys/time.h in src/net.c
1107     and add -D_POSIX_PII_SOCKET to the C compiler flags).
1108     20041103 Minor updates for the release.
1109     For some reason, Mach/PMAX caused the emulator to bug out on
1110     SunOS/sparc64 (compiled in 64-bit mode); a minor update/hack
1111     to dev_asc fixed this.
1113     ============== RELEASE 0.2.2 ==============
1115     20041103 Minor updates.
1116     20041104 Minor updates.
1117     20041105 Running with different framebuffer windows on different X11
1118     displays works now (even with different bit depths and
1119     endiannesses on different displays). A new command line option
1120     (-z) adds DISPLAYs that should be used.
1121     Update regarding how DECstation BT459 cursors are used;
1122     transparency :-) and some other bug fixes.
1123     20041106 More bt459 updates. The cursor color seems to be correct for
1124     NetBSD, OpenBSD, Ultrix, and Sprite.
1125     Some minor bintrans updates (redesigning some things).
1126     20041107 More bintrans updates (probably broken for non-Alpha targets).
1127     Moving doc/mips64emul.1 to man/.
1128     20041108 Some updates.
1129     20041109 More updates. Bintrans experiments mostly.
1130     20041110 Some minor bintrans updates.
1131     20041111 Minor updates.
1132     20041112 A little rewrite of the bintrans system (again :-), this time
1133     a lot more na├»ve and non-optimizing, in order to support delay
1134     slots in a much simpler way.
1135     Ultrix 4.5 boots into a usable desktop on my home machine in
1136     3min 28sec, compared to 6-8 minutes without bintrans.
1137     20041113 Some minor bintrans updates.
1138     20041114 More bintrans updates. Ultrix now boots in exactly 3 minutes
1139     on my home machine.
1140     20041115 More bintrans updates.
1141     20041116 Bintrans updates.
1142     20041117 Working on dev_dec_ioasic and related issues.
1143     Adding support for letting translated code access devices in
1144     some cases (such as framebuffers).
1145     20041118 Moving some MIPS registers into Alpha registers, which gives
1146     a speed improvement.
1147     Beginning to write an i386 bintrans backend. Skeleton stuff
1148     works, lui, jr/jalr, addiu/daddiu/andi/ori/xori, j/jal,
1149     addu/daddu/subu/xor/or/nor/and.
1150     20041119 dsubu/sll/srl/sra, rfe,mfc0,dmfc0, beq,bne, delayed branches.
1151     Some load/store (but not for bigendian emulation yet.)
1152     Time to reach Ultrix 4.5's graphical login on a 2.8 GHz Xeon
1153     host is now down to 20 seconds!
1154     Adding bgez, bltz, bgtz, and blez to the i386 backend.
1155     20041120 Minor updates (bintrans related mostly).
1156     Time to reach Ultrix login on the Xeon is now 11 seconds.
1157     Adding 'mult', 'multu' and a some parts of mtc0 to the Alpha
1158     backend.
1159     The transparency updates to the X11 cursor support made the
1160     OpenBSD/arc cursor disappear; that has been fixed now.
1161     Unfortunately, something with Acer Pica emulation is broken
1162     when bintrans is enabled.
1163     20041121 Making tlbwr, tlbwi, tlbp, tlbr callable directly from
1164     translated code.
1165     Adding sltiu, slti, slt, and sltu to the i386 backend.
1166     20041122 More bintrans updates.
1167     With the Alpha backend, the status and entryhi registers
1168     can (in some cases) be written without exiting to the main
1169     loop. Ultrix boot time until a usable desktop is reached
1170     is about 1 min 35 seconds on the 533 MHz pca56.
1171     Adding srlv, srav, and sllv to the i386 backend.
1172     20041123 Removing the special handling of high physical addresses for
1173     DECstation emulation from the main memory handling code, and
1174     replacing it with a mirror device instead. (This results in
1175     a tiny increase in performance, and cleaner code.)
1176     Various minor updates.
1177     20041124 Ripping out _all_ bintrans load/store code, because I have
1178     a new idea I'd like to try out.
1179     A total rewrite of the load/store system. It works when
1180     emulating 32-bit MIPS, but not for 64-bit code yet.
1181     Some minor updates to the dev_fb, but no speed improvement.
1182     Making the 'le' ethernet device' SRAM work with bintrans.
1183     20041125 Various updates.
1184     Adding a little "bootup logo" to the framebuffer.
1185     There is now one translate_address() for R3000-style MMUs,
1186     and one for the other types. (This gives a tiny speed
1187     improvement.)
1188     20041126 Minor updates, bintrans.
1189     Fixing the bug which caused OpenBSD/arc (R4000) to bug out;
1190     it was introduced between the 7:th and 10:th of November
1191     when moving up the check for interrupts to above the code
1192     which runs bintrans code, in src/cpu.c.
1193     Adding movn and movz to the Alpha bintrans backend.
1194     20041127 Various minor updates.
1195     20041128 Making the R2000/R3000 caches work with bintrans, even in
1196     isolated mode. (Not true cache emulation, but it works with
1197     NetBSD/pmax, OpenBSD/pmax, and Ultrix.)
1198     Making the default cache size for R3000 4KB instr, 4 KB data;
1199     a real R3000 could have 64KB each, but emulated OSes run
1200     faster when they think the cache is smaller :-)
1201     Updates to the i386 backend: the nr of executed instructions
1202     is now placed in ebp at all times, and some support for
1203     mtc0 similar to how it is done in the Alpha backend has been
1204     added. A full NetBSD/pmax 1.6.2 install can now be done in
1205     5 minutes 35 seconds, on a 2.8 GHz Xeon host (with -bD2 -M20).
1206     Adding mult and multu to the i386 bintrans backend.
1207     Reducing the number of malloc/free calls used by the
1208     diskimage subsystem.
1209     20041129 Minor updates to the Alpha bintrans backend.
1210     20041130 Trying to fix the bug which prevents Linux from working
1211     with bintrans. It _seems_ to work now. (Pages could in some
1212     cases be written to after they were translated, but that
1213     has been fixed now.)
1214     A couple of other minor fixes.
1215     Minor updates to the Alpha backend (directly using Alpha
1216     registers in some cases, instead of loading into temporaries).
1217     Updates to the i386 backend (special hacks for 32-bit
1218     MIPS emulation, which are fast on i386, for example only
1219     updating half of the pc register).
1220     20041201 More updates to the i386 backend, similar to those yesterday.
1221     Preparing for release 0.2.3.
1222     Adding a generic load/store mechanism, which is used when the
1223     32-bit optimized version cannot be used (for R4000 etc).
1225     ============== RELEASE 0.2.3 ==============
1227     20041202 If ALWAYS_SIGNEXTEND_32 is defined in misc.h, and an
1228     incorrectly extended register is detected, the emulator now
1229     exits instead of continues.
1230     Removing the LAST_USED_TLB_EXPERIMENT stuff.
1231     Minor updates to work better with Windows NT's ARCINST.EXE;
1232     printing 0x9b via arcbios becomes ESC + '[', and the ARC
1233     memory descriptor stuff has been generalized a bit more.
1234     Adding arbios hacks for Open(), Seek(), GetRelativeTime(),
1235     and Read() to allow WinNT's SETUPLDR to read the filesystem
1236     on the diskimage used for booting.
1237     20041203 Adding a terminal emulation layer which converts arcbios
1238     stdout writes to "VGA text console" cell characters. Seems
1239     to work with Windows NT and arcdiag.
1240     Adding a 8x8 font to dev_vga.
1241     Adding more ARC components to the component tree (for PICA
1242     emulation).
1243     20041204 Minor updates.
1244     More updates to dev_vga. Adding a 8x10 font.
1245     Adding a hack so that the framebuffer logo is visible at
1246     startup with dev_vga. (It disappears at the first scroll.)
1247     A minor fix for a bug which was triggered when running
1248     dual- or tripple-head, on 2 or 3 actual X11 displays.
1249     20041205 Fixing a bintrans bug.
1250     Some other minor updates (some of them bintrans related).
1251     20041206 Moving the web page to http://gavare.se.
1252     Adding a hack for mmap() which supports anonymous mapping
1253     using /dev/zero, but not using MAP_ANON{,YMOUS}.
1254     Separating out opcodes.h, cop0.h, and cpu_types.h from misc.h.
1255     20041207 Minor bintrans update. (In some cases, it isn't necessary
1256     to return to the main loop, when translating from a new page.)
1257     Some other minor i386 bintrans backend optimizations.
1258     And some other minor updates.
1259     i386 backend update: the lowest 32 bits of the pc register
1260     are now placed in an i386 register.
1261     20041208 Adding GetConfigurationData() and some support for config
1262     data, to src/arcbios.c.
1263     Adding a bogus 0xbd SCSI command (used by Windows NT). It is
1264     not listed in http://www.danbbs.dk/~dino/SCSI/SCSI2-D.html.
1265     If the framebuffer cursor contains more than 1 color, then
1266     the host's X11 cursor disappears. (Nice for DECstation
1267     emulation with emulated X.)
1268     For ARC and SGI emulation, if an exception occurs before an
1269     exception handler is installed, the emulator now exits
1270     nicely (as suggested by Alec Voropay).
1271     A couple of minor updates to the ARCBIOS emulation subsystem.
1272     The single step debugger is now automatically entered when
1273     all CPUs have stopped running, unless there was a clean
1274     shutdown of some kind (PROM halt() call, or similar).
1275     Adding a -V option for starting up in a paused state, into
1276     the single-step debugger.
1277     Adding a note about 'mmon' to the documentation
1278     (http://www.brouhaha.com/~eric/software/mmon/).
1279     20041209 Fixes to devices/console.c which makes cursor keys and such
1280     a bit more reliable.
1281     ARCBIOS hack/update which creates memory descriptors _after_
1282     loading the executable. (Seems to work with OpenBSD/arc,
1283     NetBSD/arc, arcdiag, IRIX, NetBSD/sgimips, OpenBSD/sgi, and
1284     some Windows NT executables.)
1285     ARCBIOS support for cursor keys (ESC + '[' ==> 0x9b).
1286     A bintrans update (for 32-bit emulation) which speeds up
1287     jumps between pages, if code is already translated.
1288     Changing the default bintrans cache from 20 to 24 MB.
1289     20041210 Optimizing unaligned load/stores a little bit in src/cpu.c.
1290     Omiting the check for nr of executed bintrans instructions
1291     on some forward jumps.
1292     Adding the 'syscall' and 'break' instructions to the
1293     bintrans backends.
1294     Allowing more bits of the status register to be written to
1295     from within inside translated code, on R3000.
1296     Getting rid of the final pixel when hiding the host's mouse
1297     cursor.
1298     store_buf() now copies data 8 or 4 bytes at a time, when
1299     possible. (This speeds up emulated ROM disk reads, etc.)
1300     Tiny bug fix: coprocessor unusable exceptions are now also
1301     generated (for coproc 1..3) even when in kernel mode, if the
1302     coprocessors are not enabled. This allows a Debian installation
1303     to proceed further than before. (It's still very unstable,
1304     though.)
1305     20041212 Updating doc/index.html with better Debian installation
1306     instructions.
1307     If SLOWSERIALINTERRUPTS is defined at compile time, interrupts
1308     from the dc7085 device will not come as often as they normally
1309     do. This makes Debian seem more stable.
1310     Decreasing the bintrans cache to 20 MB again.
1311     Updating some files in preparation for a 0.2.4 release.
1312     20041213 Updating the docs on how to install NetBSD 2.0/pmax, and also
1313     some updates to the section on installing Debian.
1314     32-bit bintrans backend optimization: don't inline large
1315     chunks of code, such as general jumps.
1316     20041214 Minor fix for coproc unusable for R4000 (it's the PC that,
1317     matters, not the KSU bits).
1318     Separating out the debugger from emul.c into debugger.c.
1319     Rewriting parts of the debugger.
1320     Removing the -U command line option, as it wasn't really
1321     useful. Also removing the -P option.
1322     Renaming all instances of dumppoint to breakpoint, as that
1323     is what it really is.
1324     When a breakpoint is reached, the single-step debugger is
1325     entered, instead of just turning on instruction trace.
1326     Adding a 'breakpoints' debugger command.
1327     Better fix for coproc unusable on R4000: the KSU bits matter,
1328     but the ERL and EXL bits override that.
1329     Fix which allows Debian to boot directly from a disk image
1330     (with DELO). (It reads multiple separate areas from disk.)
1331     Update to the SLOWSERIALINTERRUPTS stuff, making it even
1332     slower.
1333     Fixes based on feedback from Alec Voropay (-Q with ARC
1334     emulation skips the setup of arcbios data structures in
1335     memory, and no sign-extension _after_ writing a 32-bit
1336     value to a 64-bit coproc 0 register).
1337     Adding a 'devices' command to the debugger.
1338     The 'registers' and 'tlbdump' commands now take an optional
1339     argument (a cpu id).
1340     Adding rudimentary tab-completion and cursor key stuff to
1341     debugger_readline().
1342     Adding some more debugger commands: 'bintrans' and 'machine'.
1343     20041215 Adding a 'devstate' command; implementing a skeleton for a
1344     state function for the bt459 device.
1345     Implementing yet another variant of the SLOWSERIALINTERRUPTS
1346     stuff.
1347     Implementing more of the different exception offsets (taking
1348     CAUSE_IV and STATUS_BEV into account).
1349     hpc_bootinfo should now be correctly filled on big-endian
1350     hosts.
1351     Always shift left by 12, not by pageshift, to get physical
1352     addresses on MMU4K etc. (Thanks to Alec Voropay for noticing
1353     this.)
1354     20041216 The KN02's CSR can now be read from bintranslated code.
1355     Adding a dummy dev_sgi_mec.
1356     20041217 The default framebuffer and model settings for -F (hpcmips)
1357     should now be almost like Cassiopeia E-500.
1358     Changing -DSLOWSERIALINTERRUPTS into a command line option, -U.
1359     20041218 Continuing a little bit on the mec controller.
1360     Removing lots of #include <math.h> that weren't really used.
1361     20041219 Fixing stuff that broke because of the pageshift bugfix.
1362     Adding an argument to the s (step) debugger command, for doing
1363     more than 1 step at a time.
1364     ARCBIOS components representing disk images are now created
1365     to actually match the disk images in use, and some other
1366     arcbios-related updates; adding a dummy GetComponent().
1367     Adding a 'lookup' command to the debugger, for symbol lookups.
1368     Adding a "NEC Express RISCserver" mode (NEC-R96, -A8).
1369     Adding a dummy ARCBIOS GetFileInformation(), GetTime(), and
1370     SetEnvironmentVariable().
1371     20041220 Improved command line editing (including command history)
1372     in the debugger.
1373     Separating some more .h files from each other, and fixing
1374     some Solaris compiler warnings.
1375     20041221 Minor updates.
1376     20041222 Minor updates; hpcmips (BE300, VR41xx) stuff.
1377     The 'register' debugger command is now 'reg', and it can
1378     be used to modify registers, not just read them.
1379     The syntax for hpcmips (-F) is now -F xx, where xx is a
1380     machine model identifier. (1 = BE300.)
1381     20041223 Some really minor updates.
1382     20041226 Minor updates to doc/index.html (NetBSD 1.6.2 -> 2.0, and
1383     some other rearrangements).
1384     Many updates to the debugger (better register manipulation,
1385     breakpoint manipulation, and other updates).
1386     Fix to dev_cons.c to allow the regression tests to work again.
1387     The configure script now tries to detect the presence of a
1388     MIPS cross compiler. (Used by "make regtest".)
1389     Regression tests are now run both with and without bintrans.
1390     20041227 Some hacks to the VR41xx code to allow Linux for BE300 to
1391     get far enough to show the penguin on the framebuffer.
1392     20041228 Merging dev_kn01_csr.c and dev_vdac.c into dev_kn01.c.
1393     20041229 Various updates to the debugger (nicer tlb output and other
1394     things).
1395     Some floating point fixes in src/coproc.c (mov is not
1396     an arithmetic instruction), and in src/cpu.c (ldcX/sdcX in
1397     32-bit mode uses register pairs).
1398     '-O' now also affects the bootstring for SGI and ARC emulation.
1399     Bintrans updates (slightly faster 32-bit load/store on alpha).
1400     Updates to the i386 backend too, but no real speed improvement.
1401     20041230 Cleaning up parts of the 64-bit virtual-to-physical code for
1402     R10000, and per-machine default TLB entries can now be set
1403     for SGI and ARC machines.
1404     Fix: SGI-IP27 is ARC64, not ARCS.
1405     20050101 Minor updates.
1406     20050102 Minor updates.
1407     Fixing a 32-bit 'addu' bug in the bintrans backends.
1408     Allowing fast load/stores even in 64-bit bintrans mode, if
1409     the top 32 bits are either 0x00000000 or 0xffffffff (for Alpha
1410     only).
1411     Re-enabling ctc0/cfc0 (but what do they do?).
1412     Adding beql, bnel, blezl, and bgtzl to the Alpha backend.
1413     20050103 Adding fast 32-bit load/store for 64-bit mode emulation to
1414     the i386 backend too (similar to the Alpha code). Not really
1415     tested yet, though.
1416     Adding an incomplete regression test case for lwl/lwr/ldl/ldr.
1417     Playing around with bintranslated lwl and lwr for Alpha.
1418     20040104 Changing many occurances of pica to jazz.
1419     Various other updates.
1420     20050105 Fixing some more bintrans bugs (both Alpha and i386).
1421     Unaligned stores that cause tlb refill exceptions should now
1422     cause TLBS exceptions, not TLBL.
1423     Adding experimental swl and swr to the Alpha backend.
1424     Adding lwl, lwr, swl, and swr to the i386 backend.
1425     20050106 Adding another hpcmips model (Casio E-105, -F2), and doing
1426     some updates to the VR41xx code. NetBSD/hpcmips prints some
1427     boot messages.
1428     20050108 Minor updates.
1429     20050109 dev_dec5500_ioboard.c and dev_sgec.c => dev_kn220.c.
1430     dev_crime.c, _mace.c, and _macepci.c => dev_sgi_ip32.c.
1431     Also adding dev_sgi_mec, _ust, and _mte into dev_sgi_ip32.c.
1432     A slight license change. Still revised BSD-style, though.
1433     memory_v2p.c is now included separately for MMU10K and
1434     MMU8K.
1435     Fixing a NS16550 bug, triggered by NetBSD 2.0, but not 1.6.2.
1436     Refreshing the UltraSPARC bintrans backend skeleton.
1437     Merging dev_decbi, _deccca, and _decxmi into dev_dec5800.c.
1438     Sparc backend instructions done so far: mthi/mtlo/mfhi/mflo,
1439     lui, addu, daddu, subu, dsubu, and, or, nor, xor, sll, dsll,
1440     srl, and sra.
1441     Adding more sparc backend instructions: addiu, daddiu, xori,
1442     ori, andi, srlv, srav, sllv, slt, sltu, slti, sltiu.
1443     20050110 Changing the default bintrans cache to 16 MB, and some other
1444     minor updates.
1445     Adding div and divu to the i386 backend (but not Alpha yet).
1446     More work on ARCBIOS emulation.
1447     Trying to find a bug which affects Linux on Playstation 2 in
1448     bintrans mode.
1449     20050111 Moving around some Playstation 2 stuff, but I haven't found
1450     the bug yet. It is triggered by load/stores.
1451     More ARCBIOS updates, enough to let Windows NT partition
1452     disks in some rudimentary fashion.
1453     20050112 Testing for release 0.2.4.
1454     Fixes to suppress compiler warnings.
1456     ============== RELEASE 0.2.4 ==============
1458     20050113 Minor updates.
1459     20050114 Fix to the Alpha bintrans backend to allow compilation with
1460     old versions of gcc (2.95.4).
1462     ============== RELEASE ==============
1464     20050115 Various updates and fixes: some IP32 stuff, the debugger,
1465     ns16550 loopback tx isn't transmitted out anymore, ...
1466     Removing old/broken R10000 cache hacks, which weren't really
1467     used.
1468     20050116 Minor updates to the documentation on using PROM images.
1469     Adding ARCBIOS function 0x100 (used by IRIX when returning
1470     from main, but undocumented).
1471     MC146818 updates (mostly SGI-related).
1472     ARCS64 updates (testing with an OpenBSD snapshot in IP27
1473     mode). This causes Linux/IP30 to not work. Maybe IP27 and
1474     IP30 differ, even though both are 64-bit?
1475     Removing some nonsensical ARCS64 code from machine.c.
1476     Better handling of 128MB and 512MB memory offsets used by
1477     various SGI models.
1478     Trying to revert the ARCS64 changes (OpenBSD/sgi does
1479     seem to be aware of 64-bit vs 32-bit data structures in
1480     _some_ places, but not all), to make Linux/IP30 work again.
1481     Adding "power off" capability to the RTC, as used on IP32
1482     (and possibly IP30 and others).
1483     Some IP30 updates.
1484     20050117 Debugger updates (symbolic register names instead of just rX,
1485     and using %08x instead of %016llx when emulating 32-bit CPUs
1486     in more places than before).
1487     Removing the dummy sgi_nasid and sgi_cpuinfo devices.
1488     Also using symbolic names for coprocessor 0 registers.
1489     Adding DEV_MP_MEMORY to dev_mp.c.
1490     Adding a 'put' command to the debugger.
1491     ARCBIOS function 0x100 used by IRIX seems to _NOT_ be a
1492     ReturnFromMain(), but something else undocumented.
1493     The count and compare registers are now 32-bit in all
1494     places, as they should be. (This causes, among other things,
1495     OpenBSD/sgi to not hang randomly in userspace anymore.)
1496     On breakpoints, the debugger is now entered _at_ the
1497     instruction at the breakpoint, not after it.
1498     Some cursor keys now work when inputed via X.
1499     Refreshing the MC146818 device a bit more.
1500     20050118 Trying to add some support for less-than-4KB virtual pages,
1501     used by at least VR4131. Thanks to Alexander Yurchenko for
1502     noticing this. (I'm assuming for now that all R41xx work
1503     this way, which is not necessarily true.) It doesn't really
1504     work yet though.
1505     Renicing the "loading files" messages and other things
1506     displayed during startup.
1507     Changing the disassembly output of ori, xori, and andi to
1508     unsigned hex immediate, instead of decimal (as suggested
1509     by Alec Voropay).
1510     configure-script update for HP-UX, and switching from using
1511     inet_aton() to inet_pton() (as suggested by Nils Weller).
1512     Also adding -lnsl on Solaris, if required by inet_pton().
1513     Lots of minor R4100-related updates.
1514     20050119 Correcting the R4100 config register in src/coproc.c, and
1515     a minor update to dev_vr41xx.
1516     Finally began a redesign/remodelling/cleanup that I have had
1517     in mind for quite some time... moving many things that were
1518     in struct emul into a new struct machine.
1519     Userland emulation now works with bintrans.
1520     Refreshing the LANCE controller (dev_le.c).
1521     Fixing the LK201 keyboard id.
1522     20050120 Continuing on the remodelling/cleanup.
1523     Fixing the SCSI bug (which was triggered sometimes by
1524     NetBSD 2.0/pmax on Linux/i386 hosts).
1525     Adding a speed-limit hack to the mc146818 device when running
1526     in DECstation mode (limiting to emulated 30 MHz clock, so
1527     that Ultrix doesn't freak out).
1528     Adding an ugly workaround for the floating-point bug which
1529     is triggered when running NetBSD/pmax 2.0 on an Alpha host.
1530     The count/compare interrupt will not be triggered now, if
1531     the compare register is left untouched.
1532     Many, many other fixes...
1533     20050121 Continuing the remodelling/cleanup. (Mostly working on the
1534     network stack, and on moving towards multiple emulations
1535     with multiple machines per emulation.)
1536     Fixbug: not clearing lowest parts of lo0 and hi on tlbr
1537     (seems to increase performance when emulating Linux?).
1538     20050122 Continuing the remodelling/cleanup.
1539     Linux on DECstation uses a non-used part of the RTC registers
1540     for the year value; this is supported now, so Linux thinks
1541     it is 2005 and not 2000.
1542     Began hacking on something to reply to Debian's DHCP requests,
1543     but it's not working yet.
1544     20050123 Continuing the remodelling/cleanup.
1545     20050124 Continuing the remodelling/cleanup.
1546     Converting the dev_vga charcell memory to support direct
1547     bintrans access (similar to how dev_fb works), and fixing a
1548     couple of bintrans bugs in the process.
1549     The emulator now compiles under OpenBSD/arc 2.3 without
1550     crashing (mostly due to the bintrans fixes, but also some
1551     minor updates to the configure script).
1552     20050125 Continuing the remodelling/cleanup.
1553     The '-a' option was missing in the Hello World example in the
1554     documentation. (Thanks to Soohyun Cho for noticing this.)
1555     20050126 Continuing the remodelling/cleanup. Moving around stuff in
1556     the header files, etc. Adding a '-K' command line option, which
1557     forces the debugger to be entered at the exit of a simulation,
1558     regardless of failure or success. Beginning to work on the
1559     config file parser.
1560     Splitting doc/index.html into experiments.html, guestoses.html,
1561     intro.html, and misc.html.
1562     Updating the man page and adding a skeleton section about the
1563     configure files to doc/misc.html.
1564     20050127 Minor documentation updates.
1565     20050128 Continuing the remodelling/cleanup, mostly working on the
1566     config file parser (adding a couple of machine words, enough
1567     to run simple emulations, and adding support for multi-line
1568     comments using tuborgs).
1569     Removing some command line options for the least working
1570     emulation modes (-e, -f, -g, -E, -H), adding new -E and -e
1571     options for selecting machine type.
1572     Moving global variables from src/x11.c into struct machine (a
1573     bit buggy, but it seems to almost work).
1574     20050129 Removing the Playstation 2 mode (-B) and hpcmips modes (-F)
1575     from the command line as well.
1576     Changing the -T command line option from meaning "trace on bad
1577     address" to meaning "enter the single-step debugger on bad
1578     address".
1579     More updates to the configuration file parser (nested tuborg
1580     comments, more options, ...).
1581     Making -s a global setting, not just affecting one machine.
1582     Trying to fix the X11 event stuff... but it's so ugly that it
1583     must be rewritten later.
1584     Continuing the multi-emul cleanup.
1585     Bugfixes and other updates to dev_vga.
1586     20050130 Continuing the remodelling/cleanup. Finally moving out the
1587     MIPS dependant stuff of the cpu struct into its own struct.
1588     Renaming cpu.c to cpu_mips.c, and cpu_common.c to cpu.c.
1589     Adding a dummy cpu_ppc.c.
1590     Removing the UltraSPARC bintrans backend.
1591     Many other minor updates.
1592     src/file.c should now be free from MIPS-dependancies.
1593     20050131 Continuing a little bit more on src/file.c. PPC ELFs can now
1594     be loaded, it seems.
1595     Continuing on src/cpu_ppc.c.
1596     'mips' is undefined by the configure script, if it is defined
1597     by default. (Fixes build on at least OpenBSD/arc and
1598     NetBSD/arc, where gcc defines 'mips'.)
1599     A couple of other minor fixes.
1600     Removing the "Changing framebuffer resolution" section from
1601     doc/misc.h (because it's buggy and not very useful anway).
1602     Adding a mystrtoull(), used on systems where there is no
1603     strtoull() in libc.
1604     Adding 'add_x11_display' to the configure file parser
1605     (corresponding to the -z command line option).
1606     Continuing the multi-emul machine cleanup.
1607     20050201 Minor updates (man page, RELEASE, README).
1608     Continuing the cleanup.
1609     Adding a 'name' field to the emul struct, and adding a command
1610     to the debugger ("focus") to make it possible to switch focus
1611     to different machines (in different emuls).
1612     Beginning to work on the PPC disassembler etc. Hello World
1613     for linux-ppc64 can be disassembled :-)
1614     20050202 Adding a hack for reading symbols from Microsoft's variant of
1615     COFF files.
1616     Adding a dummy cpu_sparc.c and include/cpu_sparc.h.
1617     Cleaning up more to support multiple cpu families.
1618     Various other minor updates.
1619     Fixing another old-gcc-on-Alpha problem.
1620     20050203 Bintrans cache size is now variable, settable by a new
1621     configuration file option 'bintrans_size'.
1622     The debugger can now theoretically call disassembler functions
1623     for cpu families with non-fixed instruction word length.
1624     Working more on the mec controller. It now works well enough
1625     to let both NetBSD/sgimips and OpenBSD/sgi connect to the
1626     outside world using ftp :-)
1627     Continuing on the cleanup of the networking subsystem.
1628     20050204 Continuing the cleanup.
1629     Working on a way to use separate xterms for serial ports and
1630     other console input, when emulating multiple machines (or one
1631     machine with multiple serial lines active).
1632     20050205 Minor documentation updates.
1633     20050206 Moving console.c from devices/ to src/, and continuing the
1634     work on using separate windows for each serial console.
1635     Trying to get OpenBSD/sgi to boot with root-on-nfs on an
1636     emulated NetBSD/pmax server, but no success in setting up
1637     the server yet.
1638     20050207 Continuing on the console cleanup.
1639     Adding a 'start_paused' configuration file option, and a
1640     'pause' command to the debugger.
1641     20050208 Everything now builds with --withoutmips.
1642     Continuing on the documentation on how to run OpenBSD/sgi, but
1643     no actual success yet.
1644     sizeof => (int)sizeof in the configure script (as suggested by
1645     Nils Weller).
1646     20050209 Adding a check for -lm to the configure script.
1647     Continuing on the cleanup: trying to make memory_rw non-MIPS
1648     dependant.
1649     Trying to make a better fix for the cdrom-block-size problems
1650     on FreeBSD. (It now works with a Windows NT 4.0 cdrom in my
1651     drive.)
1652     Began a clean-up of the userland subsystem.
1653     20050210 Continuing the userland cleanup.
1654     IBM's Hello World example for Linux/PPC64 runs fine now.
1655     20050211 Continuing the cleanup. Removing the --userland configure
1656     option (because support for userland is always included now).
1657     Working more on getting OpenBSD/sgi to boot with root on
1658     nfs. (Booting with the ramdisk kernel, and mounting root via
1659     nfs works, but not yet from the generic kernel.)
1660     Major update to the manpage.
1661     Removing the -G command line option (SGI modes).
1662     20050212 Updating the documentation (experimental devices: dev_cons
1663     and dev_mp, better hello.c, and some other things).
1664     20050213 Some minor fixes: documentation, 80 columns in some source
1665     files, better configure script options.
1666     Adding some more PPC instructions.
1667     Added a NOFPU flag to the MIPS cpu flags, so that executing
1668     FPU instructions on for example VR4xxx will fail (as suggested
1669     by Alexander Yurchenko).
1670     20050214 Implementing more PPC instructions.
1671     Adding dev_pmppc.
1672     20050215 Continuing the work on PPC emulation. Adding a (mostly non-
1673     working) NetBSD/powerpc userland mode, a (buggy)
1674     show_trace_tree thing (simliar to the MIPS version).
1675     20050216 Continuing...
1676     20050218 Continuing the clean-up. (Merging the devices and devstate
1677     debugger commands, more 80-column cleanup, some documentation
1678     updates, ...).
1679     20050219 Removing the -D, -A, and -a command line options. Updating the
1680     documentation, in preparation for the next release.
1681     Adding interrupt stuff to dev_cons.
1682     Single-stepping now looks/works better with bintrans enabled.
1683     Beginning the first phase of release testing; various minor
1684     updates to make everything build cleanly on Solaris.
1685     20050220 Continuing testing for the release...
1687     ============== RELEASE 0.3 ==============
1689     20050221 Minor updates. Some more clean-up.
1690     Beginning on the new device registry stuff.
1691     20050222 Continuing on the device stuff, and doing various other kinds
1692     of clean-up.
1693     Adding a dummy BeBox mode.
1694     Making the pc register common for all cpu families.
1695     Adding some more PPC instructions and fixing some bugs.
1696     20050223 Continuing on the BeBox stuff, and adding more instructions.
1697     Adding an ns16550 to the VR4131 emulation (which is probably
1698     a close enough fake to the VR4131's SIU unit).
1699     20050224 Minor updates. Adding dummy PReP, macppc, and DB64360 modes.
1700     Continuing on the device registry rewrite.
1701     20050225 Continuing on the device stuff.
1702     20050226 Continuing more on the device rewrite.
1703     Separating the "testmips" machine into testmips and baremips
1704     (and similarly with the ppc machine).
1705     Redesigning the device registry again :-)
1706     Adding a "device" command to the config file parser.
1707     Adding "device add" and "device remove" to the debugger.
1708     Removing pcidevs.h, because it was almost unused.
1709     20050228 Correcting the Sprite disk image url in the documentation.
1710     20050301 Adding an URISC cpu emulation mode (single-opcode machine).
1711     20050303 Adding some files to the experiments directory (rssb_as.c,
1712     rssb_as.README, urisc_test.s).
1713     Continuing on the device stuff.
1714     20050304 Minor documentation update. Also, the SPARC, PPC, and URISC
1715     modes are now enabled by default in the configure script.
1716     Some minor PPC updates (adding a VGA device to the bebox
1717     emulation mode).
1718     20050305 Moving the static i386 bintrans runchunk code snippet (and the
1719     others) to be dynamically generated. (This allows the code to
1720     compile on i386 with old gcc.)
1721     Loading PPC64 ELFs now sets R2 to the TOC base.
1722     Changing the name of the emulator from mips64emul to GXemul.
1723     Splitting out the configuration file part of the documentation
1724     into its own file (configfiles.html).
1725     20050306 Some really minor documentation updates.
1726     Adding a -D command line option (for "fully deterministic"
1727     behaviour).
1728     20050308 Minor PPC updates. Adding a dummy OpenFirmware emulation layer.
1729     20050309 Adding a hack for systems without inet_pton (such as Cygwin in
1730     Windows) as suggested by Soohyun Cho. (And updating the
1731     configure script too.)
1732     Adding a dummy HPPA cpu family.
1733     Some more OpenFirmware updates.
1734     Faster loading of badly aligned ELF regions.
1735     20050311 Minor updates. Adding a dummy "NEC MobilePro 780" hpcmips
1736     machine mode; disabling direct bintrans access to framebuffers
1737     that are not 4K page aligned.
1738     20050312 Adding an ugly KIU hack to the VR41xx device (which enables
1739     NetBSD/hpcmips MobilePro 780 keyboard input).
1740     20050313 Adding a dummy "pcic" device (a pcmcia card controller).
1741     Adding a dummy Alpha cpu emulation mode.
1742     Fixing a strcmp length bug (thanks to Alexander Yurchenko for
1743     noticing the bug).
1744     20050314 Some minor bintrans-related updates in preparation for a new
1745     bintrans subsystem: command line option -b now means "old
1746     bintrans", -B means "disable bintrans", and using no option at
1747     all selects "new bintrans".
1748     Better generation of MAC addresses when emulating multiple
1749     machines and/or NICs.
1750     Minor documentation updates (regarding configuration files).
1751     20050315 Adding dummy standby, suspend, and hibernate MIPS opcodes.
1752     RTC interrupt hack for VR4121 (hpcmips).
1753     Enough of the pcic is now emulated to let NetBSD/hpcmips detect
1754     a PCMCIA harddisk controller card (but there is no support for
1755     ISA/PCMCIA interrupts yet).
1756     Adding preliminary instructions on how to install
1757     NetBSD/hpcmips.
1758     Continuing the attempt to get harddisks working with interrupts
1759     (pcic, wdc on hpcmips).
1760     20050318 Minor updates. (Fixing disassembly of MIPS bgtz etc.,
1761     continuing on the device cleanup, ...)
1762     20050319 Minor updates.
1763     20050320 Minor updates.
1764     20050322 Various minor updates.
1765     20050323 Some more minor updates.
1766     20050328 VR41xx-related updates (keyboard stuff: the space key and
1767     shifted and ctrled keys are now working in userland (ie
1768     NetBSD/hpcmips' ramdisk installer).
1769     Also adding simple cursor key support to the VR41xx kiu.
1770     20050329 Some progress on the wdc.
1771     Updating the documentation of how to (possibly) install
1772     NetBSD/hpcmips, once it is working.
1773     Adding delays before wdc interrupts; this allows NetBSD
1774     2.0/hpcmips to be successfully installed!
1775     Mirroring physical addresses 0x8....... to 0x00000000 on
1776     hpcmips; this makes it possible to run X11 inside
1777     NetBSD/hpcmips :-)
1778     Updating the documentation regarding NetBSD/hpcmips.
1779     Fixing 16-bit vs 15-bit color in dev_fb.
1780     20050330 Print a warning when the user attempts to load a gzipped
1781     file. (Thanks to Juan RP for making me aware of this "bug".)
1782     20050331 Importing aic7xxx_reg.h from NetBSD.
1783     Adding a "-x" command line option, which forces xterms for
1784     each emulated serial port to always be opened.
1785     Adding a MobilePro 770 mode (same as 780, but different
1786     framebuffer address which allows bintrans = fast scrolling),
1787     and a MobilePro 800 (with 800x600 pixels framebuffer :-).
1788     20050401 Minor updates.
1789     20050402 Minor updates. (The standby and suspend instructions are
1790     bintransed as NOPs, and some minor documentation updates.)
1791     20050403 Adding an Agenda VR3 mode, and playing around with a Linux
1792     kernel image, but not much success yet.
1793     Changing BIFB_D16_FFFF -> BIFB_D16_0000 for the hpcmips
1794     framebuffers, causing NetBSD to boot with correct colors.
1795     New syntax for loading raw files: loadaddr:skiplen:
1796     initialpc:filename. (This is necessary to boot the Linux VR3
1797     kernels.)
1798     The Linux VR3 kernel boots in both serial console mode and
1799     using the framebuffer, but it panics relatively early.
1800     20050404 Continuing on the AHC, and some other minor updates.
1801     20050405 Adding a note in doc/experimental.html about "root1.2.6.cramfs"
1802     (thanks to Alec Voropay for noticing that it wasn't part
1803     of root1.2.6.kernel-8.00).
1804     Also adding a note about another cramfs image.
1805     -o options are now added to the command line passed to the
1806     Linux kernel, when emulating the VR3.
1807     Adding a MobilePro 880 mode, and a dummy IBM WorkPad Z50 mode.
1808     20050406 Connecting the VR3 serial controller to irq 9 (Linux calls this
1809     irq 17), and some other interrupt-related cleanups.
1810     Reducing the memory overhead per bintranslated page. (Hopefully
1811     this makes things faster, or at least not slower...)
1812     20050407 Some more cleanup regarding command line argument passing for
1813     the hpcmips modes.
1814     Playing with Linux kernels for MobilePro 770 and 800; they get
1815     as far as mounting a root filesystem, but then crash.
1816     Doing some testing for the next release.
1818     ============== RELEASE 0.3.1 ==============
1820 dpavlin 4 20050408 Some minor updates to the wdc. Linux now doesn't complain
1821     anymore if a disk is non-present.
1822     20050409 Various minor fixes (a bintrans bug, and some other things).
1823     The wdc seems to work with Playstation2 emulation, but there
1824     is a _long_ annoying delay when disks are detected.
1825     Fixing a really important bintrans bug (when devices and RAM
1826     are mixed within 4KB pages), which was triggered with
1827     NetBSD/playstation2 kernels.
1828     20050410 Adding a dummy dev_ps2_ether (just so that NetBSD doesn't
1829     complain as much during bootup).
1830     Symbols starting with '$' are now ignored.
1831     Renaming dev_ps2_ohci.c to dev_ohci.c, etc.
1832     20050411 Moving the bintrans-cache-isolation check from cpu_mips.c to
1833     cpu_mips_coproc.c. (I thought this would give a speedup, but
1834     it's not noticable.)
1835     Better playstation2 sbus interrupt code.
1836     Skip ahead many ticks if the count register is read manually.
1837     (This increases the speed of delay-loops that simply read
1838     the count register.)
1839     20050412 Updates to the playstation2 timer/interrupt code.
1840     Some other minor updates.
1841     20050413 NetBSD/cobalt runs from a disk image :-) including userland;
1842     updating the documentation on how to install NetBSD/cobalt
1843     using NetBSD/pmax (!).
1844     Some minor bintrans updates (no real speed improvement) and
1845     other minor updates (playstation2 now uses the -o options).
1846     20050414 Adding a dummy x86 (and AMD64) mode.
1847     20050415 Adding some (32-bit and 16-bit) x86 instructions.
1848     Adding some initial support for non-SCSI, non-IDE floppy
1849     images. (The x86 mode can boot from these, more or less.)
1850     Moving the devices/ and include/ directories to src/devices/
1851     and src/include/, respectively.
1852     20050416 Continuing on the x86 stuff. (Adding pc_bios.c and some simple
1853     support for software interrupts in 16-bit mode.)
1854     20050417 Ripping out most of the x86 instruction decoding stuff, trying
1855     to rewrite it in a cleaner way.
1856     Disabling some of the least working CPU families in the
1857     configure script (sparc, x86, alpha, hppa), so that they are
1858     not enabled by default.
1859     20050418 Trying to fix the bug which caused problems when turning on
1860     and off bintrans interactively, by flushing the bintrans cache
1861     whenever bintrans is manually (re)enabled.
1862     20050419 Adding the 'lswi' ppc instruction.
1863     Minor updates to the x86 instruction decoding.
1864     20050420 Renaming x86 register name indices from R_xx to X86_R_xx (this
1865     makes building on Tru64 nicer).
1866     20050422 Adding a check for duplicate MIPS TLB entries on tlbwr/tlbwi.
1867     20050427 Adding screenshots to guestoses.html.
1868     Some minor fixes and testing for the next release.
1870     ============== RELEASE 0.3.2 ==============
1872 dpavlin 6 20050428 Disabling the "-fmove-all-movables" option in the configure
1873     script, because it causes the compile to fail on OpenBSD/sgi.
1874     20050502 Minor updates.
1875     20050503 Removing the WRT54G mode (it was bogus anyway), and adding a
1876     comment about Windows NT for MIPS in doc/experiments.html.
1877     Minor updates to the x86 instruction decoding.
1878     20050504 Adding some more x86 instructions.
1879     Adding support for reading files from ISO9660 CDROMs (including
1880     gzipped files). It's an ugly hack, but it seems to work.
1881     Various other minor updates (dev_vga.c, pc_bios.c etc).
1882     20050505 Some more x86-related updates.
1883     Beginning (what I hope will be) a major code cleanup phase.
1884     "bootris" (an x86 bootsector) runs :-)
1885     20050506 Adding some more x86 instructions.
1886     20050507 tmpnam => mkstemp.
1887     Working on a hack to allow VGA charcells to be shown even when
1888     not running with X11.
1889     Adding more x86 instructions.
1890     20050508 x86 32-bit SIB addressing fix, and more instructions.
1891     20050509 Adding more x86 instructions.
1892     20050510 Minor documentation updates, and other updates (x86 stuff etc.)
1893     20050511 More x86-related updates.
1894     20050513 Various updates, mostly x86-related. (Trying to fix flag
1895     calculation, factoring out the ugly shift/rotate code, and
1896     some other things.)
1897     20050514 Adding support for loading some old i386 a.out executables.
1898     Finally beginning the cleanup of machine/PROM/bios dependant
1899     info.
1900     Some minor documentation updates.
1901     Trying to clean up ARCBIOS stuff a little.
1902     20050515 Trying to make it possible to actually use more than one disk
1903     type per machine (floppy, ide, scsi).
1904     Trying to clean up the kbd vs PROM console stuff. (For PC and
1905     ARC emulation modes, mostly.)
1906     Beginning to add an 8259 interrupt controller, and connecting
1907     it to the x86 emulation.
1908     20050516 The first x86 interrupts seem to work (keyboard stuff).
1909     Adding a 8253/8254 programmable interval timer skeleton.
1910     FreeDOS now reaches a command prompt and can be interacted
1911     with.
1912     20050517 After some bugfixes, MS-DOS also (sometimes) reaches a
1913     command prompt now.
1914     Trying to fix the pckbc to work with MS-DOS' keyb.com, but no
1915     success yet.
1916     20050518 Adding a simple 32-bit x86 MMU skeleton.
1917     20050519 Some more work on the x86 stuff. (Beginning the work on paging,
1918     and various other fixes).
1919     20050520 More updates. Working on dev_vga (4-bit graphics modes), adding
1920     40 columns support to the PC bios emulation.
1921     Trying to add support for resizing windows when switching
1922     between graphics modes.
1923     20050521 Many more x86-related updates.
1924     20050522 Correcting the initial stack pointer's sign-extension for
1925     ARCBIOS emulation (thanks to Alec Voropay for noticing the
1926     error).
1927     Continuing on the cleanup (ARCBIOS etc).
1928     dev_vga updates.
1929     20050523 More x86 updates: trying to add some support for protected mode
1930     interrupts (via gate descriptors) and many other fixes.
1931     More ARCBIOS cleanup.
1932     Adding a device flag which indicates that reads cause no
1933     side-effects. (Useful for the "dump" command in the debugger,
1934     and other things.)
1935     Adding support for directly starting up x86 ELFs, skipping the
1936     bootloader stage. (Most ELFs, however, are not suitable for
1937     this.)
1938     20050524 Adding simple 32-bit x86 TSS task switching, but no privilege
1939     level support yet.
1940     More work on dev_vga. A small "Copper bars" demo works. :-)
1941     Adding support for Trap Flag (single-step exceptions), at least
1942     in real mode, and various other x86-related fixes.
1943     20050525 Adding a new disk image prefix (gH;S;) which can be used to
1944     override the default nr of heads and sectors per track.
1945     20050527 Various bug fixes, more work on the x86 mode (stack change on
1946     interrupts between different priv.levels), and some minor
1947     documentation updates.
1948     20050528 Various fixes (x86 stuff).
1949     20050529 More x86 fixes. An OpenBSD/i386 bootfloppy reaches userland
1950     and can be interacted with (although there are problems with
1951     key repetition). NetBSD/i386 triggers a serious CISC-related
1952     problem: instruction fetches across page boundaries, where
1953     the later part isn't actually part of the instruction.
1954     20050530 Various minor updates. (Documentation updates, etc.)
1955     20050531 Adding some experimental code (experiments/new_test_*) which
1956     could be useful for dynamic (but not binary) translation in
1957     the future.
1958     20050602 Adding a dummy ARM skeleton.
1959     Fixing the pckbc key repetition problem (by adding release
1960     scancodes for all keypresses).
1961     20050603 Minor updates for the next release.
1962     20050604 Release testing. Minor updates.
1964     ============== RELEASE 0.3.3 ==============
1966     20050604 There'll probably be a release soon, with some very
1967     very tiny updates.
1969 dpavlin 8 ============== RELEASE ==============
1971     20050609 Adding simple MIPS IPIs (to dev_mp).
1972     20050611 Adding an ugly hack to track down low-reference bugs
1973     (define TRACE_NULL_CRASHES, or configure --tracenull).
1974     Other minor updates.
1975     20050612 Adding a dummy evbmips mode.
1977     ============== RELEASE ==============
1979 dpavlin 10 20050617 Experimenting some more with netbooting OpenBSD/sgi. Adding
1980     a hack which allows emulated ethernet networks to be
1981     distributed across multiple emulator processes.
1982     20050618 Minor updates (documentation, dummy YAMON emulation, etc).
1983     20050620 strcpy/strcat -> strlcpy/strlcat updates.
1984     Some more progress on evbmips (Malta).
1985     20050621 Adding a section to doc/configfiles.html about ethernet
1986     emulation across multiple hosts.
1987     Beginning the work on the ARM translation engine (using the
1988     dynamic-but-not-binary translation method).
1989     Fixing a bintrans bug: 0x9fc00000 should always be treated as
1990     PROM area, just as 0xbfc00000 is.
1991     Minor progress on Malta emulation (the PCI-ISA bus).
1992     20050622 NetBSD/evbmips can now be installed (using another emulated
1993     machine) and run (including userland and so on). :-)
1994     Spliting up the bintrans haddr_entry field into two (one for
1995     read, one for write). Probably not much of a speed increase,
1996     though.
1997     Updating some NetBSD 2.0 -> 2.0.2 in the documentation.
1998     20050623 Minor updates (documentation, the TODO file, etc).
1999     gzipped kernels are now always automagically gunzipped when
2000     loaded.
2001     20050624 Adding a dummy Playstation Portable (PSP) mode, just barely
2002     enough to run Hello World (in weird colors :-).
2003     Removing the -b command line option; old bintrans is enabled
2004     by default instead. It makes more sense.
2005     Trying to finally fix the non-working performance measurement
2006     thing (instr/second etc).
2007     20050625 Continuing on the essential basics for ARM emulation. Two
2008     instructions seem to work, a branch and a simple "mov". (The
2009     mov arguments are not correct yet.) Performance is definitely
2010     reasonable.
2011     Various other minor updates.
2012     Adding the ARM "bl" instruction.
2013     Adding support for combining multiple ARM instructions into one
2014     function call. ("mov" + "mov" is the only one implemented so
2015     far, but it seems to work.)
2016     Cleaning up some IP32 interrupt things (crime/mace); disabling
2017     the PS/2 keyboard controller on IP32, so that NetBSD/sgimips
2018     boots into userland again.
2019     20050626 Finally! NetBSD/sgimips netboots. Adding instructions to
2020     doc/guestoses.html on how to set up an nfs server etc.
2021     Various other minor fixes.
2022     Playstation Portable ".pbp" files can now be used directly.
2023     (The ELF part of the .pbp is extracted transparently.)
2024     Converting some sprintf -> snprintf.
2025     Adding some more instructions to the ARM disassembler.
2026     20050627 More ARM updates. Adding some simple ldr(b), str(b),
2027     cmps, and conditional branch instructions, enough to run
2028     a simple Hello World program.
2029     All ARM instructions are now inlined/generated for all possible
2030     condition codes.
2031     Adding add and sub, and more load/store instructions.
2032     Removing dummy files: cpu_alpha.c, cpu_hppa.c, and cpu_sparc.c.
2033     Some minor documentation updates; preparing for a 0.3.4
2034     release. Updating some URLs.
2036     ============== RELEASE 0.3.4 ==============
2038 dpavlin 12 20050628 Continuing the work on the ARM translation engine. end_of_page
2039     works. Experimenting with load/store translation caches
2040     (virtual -> physical -> host).
2041     20050629 More ARM stuff (memory access translation cache, mostly). This
2042     might break a lot of stuff elsewhere, probably some MIPS-
2043     related translation things.
2044     20050630 Many load/stores are now automatically generated and included
2045     into cpu_arm_instr.c; 1024 functions in total (!).
2046     Fixes based on feedback from Alec Voropay: only print 8 hex
2047     digits instead of 16 in some cases when emulating 32-bit
2048     machines; similar 8 vs 16 digit fix for breakpoint addresses;
2049     4Kc has 16 TLB entries, not 48; the MIPS config select1
2050     register is now printed with "reg ,0".
2051     Also changing many other occurances of 16 vs 8 digit output.
2052     Adding cache associativity fields to mips_cpu_types.h; updating
2053     some other cache fields; making the output of
2054     mips_cpu_dumpinfo() look nicer.
2055     Generalizing the bintrans stuff for device accesses to also
2056     work with the new translation system. (This might also break
2057     some MIPS things.)
2058     Adding multi-load/store instructions to the ARM disassembler
2059     and the translator, and some optimizations of various kinds.
2060     20050701 Adding a simple dev_disk (it can read/write sectors from
2061     disk images).
2062     20050712 Adding dev_ether (a simple ethernet send/receive device).
2063     Debugger command "ninstrs" for toggling show_nr_of_instructions
2064     during runtime.
2065     Removing the framebuffer logo.
2066     20050713 Continuing on dev_ether.
2067     Adding a dummy cpu_alpha (again).
2068     20050714 More work on cpu_alpha.
2069     20050715 More work on cpu_alpha. Many instructions work, enough to run
2070     a simple framebuffer fill test (similar to the ARM test).
2071     20050716 More Alpha stuff.
2072     20050717 Minor updates (Alpha stuff).
2073     20050718 Minor updates (Alpha stuff).
2074     20050719 Generalizing some Alpha instructions.
2075     20050720 More Alpha-related updates.
2076     20050721 Continuing on cpu_alpha. Importing rpb.h from NetBSD/alpha.
2077     20050722 Alpha-related updates: userland stuff (Hello World using
2078     write() compiled statically for FreeBSD/Alpha runs fine), and
2079     more instructions are now implemented.
2080     20050723 Fixing ldq_u and stq_u.
2081     Adding more instructions (conditional moves, masks, extracts,
2082     shifts).
2083     20050724 More FreeBSD/Alpha userland stuff, and adding some more
2084     instructions (inserts).
2085     20050725 Continuing on the Alpha stuff. (Adding dummy ldt/stt.)
2086     Adding a -A command line option to turn off alignment checks
2087     in some cases (for translated code).
2088     Trying to remove the old bintrans code which updated the pc
2089     and nr_of_executed_instructions for every instruction.
2090     20050726 Making another attempt att removing the pc/nr of instructions
2091     code. This time it worked, huge performance increase for
2092     artificial test code, but performance loss for real-world
2093     code :-( so I'm scrapping that code for now.
2094     Tiny performance increase on Alpha (by using ret instead of
2095     jmp, to play nice with the Alpha's branch prediction) for the
2096     old MIPS bintrans backend.
2097     20050727 Various minor fixes and cleanups.
2098     20050728 Switching from a 2-level virtual to host/physical translation
2099     system for ARM emulation, to a 1-level translation.
2100     Trying to switch from 2-level to 1-level for the MIPS bintrans
2101     system as well (Alpha only, so far), but there is at least one
2102     problem: caches and/or how they work with device mappings.
2103     20050730 Doing the 2-level to 1-level conversion for the i386 backend.
2104     The cache/device bug is still there for R2K/3K :(
2105     Various other minor updates (Malta etc).
2106     The mc146818 clock now updates the UIP bit in a way which works
2107     better with Linux for at least sgimips and Malta emulation.
2108     Beginning the work on refactoring the dyntrans system.
2109     20050731 Continuing the dyntrans refactoring.
2110     Fixing a small but serious host alignment bug in memory_rw.
2111     Adding support for big-endian load/stores to the i386 bintrans
2112     backend.
2113     Another minor i386 bintrans backend update: stores from the
2114     zero register are now one (or two) loads shorter.
2115     The slt and sltu instructions were incorrectly implemented for
2116     the i386 backend; only using them for 32-bit mode for now.
2117     20050801 Continuing the dyntrans refactoring.
2118     Cleanup of the ns16550 serial controller (removing unnecessary
2119     code).
2120     Bugfix (memory corruption bug) in dev_gt, and a patch/hack from
2121     Alec Voropay for Linux/Malta.
2122     20050802 More cleanup/refactoring of the dyntrans subsystem: adding
2123     phys_page pointers to the lookup tables, for quick jumps
2124     between translated pages.
2125     Better fix for the ns16550 device (but still no real FIFO
2126     functionality).
2127     Converting cpu_ppc to the new dyntrans system. This means that
2128     I will have to start from scratch with implementing each
2129     instruction, and figure out how to implement dual 64/32-bit
2130     modes etc.
2131     Removing the URISC CPU family, because it was useless.
2132     20050803 When selecting a machine type, the main type can now be omitted
2133     if the subtype name is unique. (I.e. -E can be omitted.)
2134     Fixing a dyntrans/device update bug. (Writes to offset 0 of
2135     a device could sometimes go unnoticed.)
2136     Adding an experimental "instruction combination" hack for
2137     ARM for memset-like byte fill loops.
2138     20050804 Minor progress on cpu_alpha and related things.
2139     Finally fixing the MIPS dmult/dmultu bugs.
2140     Fixing some minor TODOs.
2141     20050805 Generalizing the 8259 PIC. It now also works with Cobalt
2142     and evbmips emulation, in addition to the x86 hack.
2143     Finally converting the ns16550 device to use devinit.
2144     Continuing the work on the dyntrans system. Thinking about
2145     how to add breakpoints.
2146     20050806 More dyntrans updates. Breakpoints seem to work now.
2147     20050807 Minor updates: cpu_alpha and related things; removing
2148     dev_malta (as it isn't used any more).
2149     Dyntrans: working on general "show trace tree" support.
2150     The trace tree stuff now works with both the old MIPS code and
2151     with newer dyntrans modes. :)
2152     Continuing on Alpha-related stuff (trying to get *BSD to boot
2153     a bit further, adding more instructions, etc).
2154     20050808 Adding a dummy IA64 cpu family, and continuing the refactoring
2155     of the dyntrans system.
2156     Removing the regression test stuff, because it was more or
2157     less useless.
2158     Adding loadlinked/storeconditional type instructions to the
2159     Alpha emulation. (Needed for Linux/alpha. Not very well tested
2160     yet.)
2161     20050809 The function call trace tree now prints a per-function nr of
2162     arguments. (Semi-meaningless, since that data isn't read yet
2163     from the ELFs; some hardcoded symbols such as memcpy() and
2164     strlen() work fine, though.)
2165     More dyntrans refactoring; taking out more of the things that
2166     are common to all cpu families.
2167     20050810 Working on adding support for "dual mode" for PPC dyntrans
2168     (i.e. both 64-bit and 32-bit modes).
2169     (Re)adding some simple PPC instructions.
2170     20050811 Adding a dummy M68K cpu family. The dyntrans system isn't ready
2171     for variable-length ISAs yet, so it's completely bogus so far.
2172     Re-adding more PPC instructions.
2173     Adding a hack to src/file.c which allows OpenBSD/mac68k a.out
2174     kernels to be loaded.
2175     Beginning to add PPC loads/stores. So far they only work in
2176     32-bit mode.
2177     20050812 The configure file option "add_remote" now accepts symbolic
2178     host names, in addition to numeric IPv4 addresses.
2179     Re-adding more PPC instructions.
2180     20050814 Continuing to port back more PPC instructions.
2181     Found and fixed the cache/device write-update bug for 32-bit
2182     MIPS bintrans. :-)
2183     Triggered a really weird and annoying bug in Compaq's C
2184     compiler; ccc sometimes outputs code which loads from an
2185     address _before_ checking whether the pointer was NULL or not.
2186     (I'm not sure how to handle this problem.)
2187     20050815 Removing all of the old x86 instruction execution code; adding
2188     a new (dummy) dyntrans module for x86.
2189     Taking the first steps to extend the dyntrans system to support
2190     variable-length instructions.
2191     Slowly preparing for the next release.
2192     20050816 Adding a dummy SPARC cpu module.
2193     Minor updates (documentation etc) for the release.
2195     ============== RELEASE 0.3.5 ==============

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