/[gxemul]/trunk/TODO
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Revision 36 - (hide annotations)
Mon Oct 8 16:21:34 2007 UTC (13 years, 3 months ago) by dpavlin
File size: 24543 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1497 2007/03/18 03:41:36 debug Exp $
20070224	Minor update to the initialization of the ns16550 in
		machine_walnut.c, to allow that machine type to boot with the
		new interrupt system (although it is still a dummy machine).
		Adding a wdc at 0x14000000 to machine_landisk.c, and fixing
		the SCIF serial interrupts of the SH4 cpu enough to get
		NetBSD/landisk booting from a disk image :-)  Adding a
		preliminary install instruction skeleton to guestoses.html.
20070306	Adding SH-IPL+G PROM emulation, and also passing the "end"
		symbol in r5 on bootup, for Landisk emulation. This is enough
		to get OpenBSD/landisk to install :)  Adding a preliminary
		install instruction skeleton to the documentation. SuperH
		emulation is still shaky, though :-/
20070307	Fixed a strangeness in memory_sh.c (read/write was never
		returned for any page). (Unknown whether this fixes any actual
		problems, though.)
20070308	dev_ram.c fix: invalidate code translations on writes to
		RAM, emulated as separate devices. Linux/dreamcast gets
		further in the boot process than before, but still bugs out
		in userland.
		Fixing bugs in the "stc.l gbr,@-rN" and "ldc.l @rN+,gbr" SuperH 
		instructions (they should NOT check the MD bit), allowing the
		Linux/dreamcast Live CD to reach userland correctly :-)
20070310	Changing the cpu name "Alpha" in src/useremul.c to "21364" to
		unbreak userland syscall emulation of FreeBSD/Alpha binaries.
20070314	Applying a patch from Michael Yaroslavtsev which fixes the
		previous Linux lib64 patch to the configure script.
20070315	Adding a (dummy) sun4v machine type, and SPARC T1 cpu type.
20070316	Creating a new directory, src/disk, and moving diskimage.c
		to it. Separating out bootblock loading stuff from emul.c into
		new files in src/disk.
		Adding some more SPARC registers.
20070318	Preparing/testing for a minirelease, 0.4.4.1.

==============  RELEASE 0.4.4.1  ==============


1 dpavlin 36 $Id: TODO,v 1.464 2007/03/16 14:13:59 debug Exp $
2 dpavlin 2
3 dpavlin 34 -------------------------------------------------------------------------------
4 dpavlin 20
5 dpavlin 36 Landisk SH4:
6     HITTA OCH FIXA SH4-STABILITETSPROBLEMEN!
7     SH4 RTC, läs värdmaskinens klocka.
8     När NetBSD 4.0 och OpenBSD 4.1 kommit ut, uppdatera
9     installationsinstruktionerna i dokumentationen, flytta upp till
10     supportat OS (guestos & index).
11     Lägg till landisk i emulated machines i intro.html.
12     Sätt machine_landisk stable = 1, om/när allt funkar.
13 dpavlin 30
14 dpavlin 36 Add a special function to the testmachine devices, console perhaps?
15     which prints a zero-terminated string like "[[ %s ]]\n" when given
16     a virtual memory address (or a physical? or perhaps both should be possible).
17     o) NOT to the console, but to the emulator's controlling terminal.
18     DEBUG output, not console output!
19     o) Very useful for debugging. DOCUMENT it!
20    
21     Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)
22    
23     Prova att installera GNU Linux/DECstation _UTAN_
24     slow_serial_interrupts_hack_for_linux! Det kanske funkar med
25     nya interruptsystemet?
26    
27 dpavlin 34 -------------------------------------------------------------------------------
28    
29     Possible (relatively large) work packages to concentrate on in the future:
30    
31     x) SMP:
32     Get SMP working again. It is pretty much broken since I started
33     the conversion from the old bintrans system to the new dyntrans system.
34     Add better Test machine demos for SMP in the demos directory.
35 dpavlin 36 Either multiple dev_mp (one per cpu), or the single dev_mp must
36     _really_ keep all per-cpu values separate.
37 dpavlin 34
38 dpavlin 36 x) Alpha and SPARC emulation:
39     These are the next two CPU/machine families that I want to emulate.
40    
41 dpavlin 34 x) Network:
42     Redesign of the networking subsystem, at least the NAT translation
43     part. The current way of allowing raw ethernet frames to be
44     transfered to/from the emulator via UDP should probably be extended
45     to allow the frames to be transmitted other ways as well.
46     Also adding support for connecting ttys (either to xterms, or to
47     pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).
48 dpavlin 36 Documentation updates (!) are very important, making it easier to
49     use the (already existing) network emulation features.
50 dpavlin 34
51     x) PCI:
52     Pretty much everything related to runtime configuration, device
53     slots, interrupts, whatever. The current code is very hardcoded
54     and ugly.
55 dpavlin 36 o) Allow cards to be added/removed during runtime more easily.
56     o) Allow cards to be enabled/disabled (i/o ports, etc, like
57     NetBSD needs for disk controller detection).
58     o) Allow devices to be moved in memory during runtime.
59     o) Interrupts per PCI slot, etc. (A-D).
60     o) PCI interrupt controller logic... very hard to get right,
61     because these differ a lot from one machine to the next.
62 dpavlin 34
63     x) Debugging:
64     Think more about SMP debugging, etc. Right now, the
65     debugger is a mess. Also, a better connection to GDB would be
66     very nice to have.
67    
68     x) Userland emulation:
69     Primary goals would be NetBSD and Linux syscall emulation.
70    
71 dpavlin 36 x) Variable-length ISA support:
72     The support for emulation of variable length ISAs (such as
73     M68K, AMD64/i386, or AVR32) is not really there yet. It would
74     be very fun to work on this, to get it right.
75    
76     x) Native code generation backends.
77     Not necessary to have the emulator working, but speed is
78     always nice to have.
79    
80     x) Remove all "addr mult" device support!
81     Long term goal. Replace the current hacks with address
82     multiplication _per device_ with layered devices, so that the
83     end device (wdc, ns16550, whatever) only supports one access
84     style, and the layers in between convert to 16/32/64-bit
85     word alignment.
86    
87 dpavlin 34 And of course, there are _LOTS_ of minor TODOs spread out throughout
88     the source code, which must be fixed sooner or later.
89    
90     -------------------------------------------------------------------------------
91    
92     Some other things, in random order, that I'd like to fix: (Some items in
93     this list are probably out-to-date by now.)
94    
95 dpavlin 32 Dyntrans:
96 dpavlin 28 x) Instruction combination collisions? How to avoid easily...
97 dpavlin 30 x) Think about how to do both SHmedia and SHcompact in a reasonable
98 dpavlin 32 way! (Or AMD64 long/protected/real, for that matter.)
99     x) 68K emulation; think about how to do variable instruction
100     lengths across page boundaries.
101 dpavlin 28 x) Dyntrans with valgrind-inspired memory checker. (In memory_rw,
102     it would be reasonably simple to add; in each individual fast
103     load/store routine = a lot more work, and it would become
104     kludgy very fast.)
105 dpavlin 24 x) Dyntrans with SMP... lots of work to be done here.
106     x) Dyntrans with cache emulation... lots of work here as well.
107 dpavlin 36 x) Remove the concept of base RAM completely; it would be more
108     generic to allow RAM devices to be used "anywhere".
109 dpavlin 32 o) dev_mp doesn't work well with dyntrans yet
110     o) In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
111     x) Redesign/rethink the delay slot mechanism used for e.g. MIPS,
112     so that it caches a translation (that is, an instruction
113     word and the instr_call it was translated to the last
114     time), so that it doesn't need to do slow
115     to_be_translated for each end of page?
116     x) Program Counter statistics:
117     Per machine? What about SMP? All data to the same file?
118     A debugger command should be possible to use to enable/
119     disable statistics gathering.
120     Configuration file option!
121     x) Breakpoints:
122     o) Physical vs virtual addresses!
123     o) 32-bit vs 64-bit sign extension for MIPS, and others?
124     x) INVALIDATION should cause translations in _all_ cpus to be
125     invalidated, e.g. on a write to a write-protected page
126     (containing code)
127     x) 16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)
128     x) Lots of other stuff: see src/cpus/README_DYNTRANS
129 dpavlin 34 x) true recompilation backend? think carefully about this.
130     o) abstract syntax for emitting opcopdes
131     o) convert into native code only after an entire
132     block has been translated? probably best.
133     o) x86/amd64 code generator can be very similar... perhaps
134     o) branches to already translated code blocks can
135     link the blocks together
136     o) load/store are the most important.
137 dpavlin 24
138 dpavlin 28 Simple Valgrind-like checks?
139     o) Mark every address with bits which tell whether or not the address
140     has been written to.
141     o) What should happen when programs are loaded? Text/data, bss (zero
142     filled). But stack space and heap is uninitialized.
143     o) Uninitialized local variables:
144     A load from a place on the stack which has not previously
145     been stored to => warning. Increasing the stack pointer using
146     any available means should reset the memory to uninitialized.
147     o) If calls to malloc() and free() can be intercepted:
148     o) Access to a memory area after free() => warning.
149     o) Memory returned by malloc() is marked as not-initialized.
150     o) Non-passive, but good to have: Change the argument
151     given to malloc, to return a slightly larger memory
152     area, i.e. margin_before + size + margin_after,
153     and return the pointer + margin_before.
154     Any access to the margin_before or _after space results
155     in warnings. (free() must be modified to free the
156     actually allocated address.)
157    
158 dpavlin 24 MIPS:
159 dpavlin 32 o) Nicer MIPS status bits in register dumps.
160     o) Alignment exceptions.
161     o) Floating point exception correctness.
162     o) Fix this? Triggered by NetBSD/sgimips? Hm:
163     to_be_translated(): TODO: unimplemented instruction:
164     000000000065102c: 00200800 (d) rot_00 at,zr,0
165     o) Some more work on opcodes.
166 dpavlin 24 x) MIPS64 revision 2.
167 dpavlin 28 o) Find out which actual CPUs implement the rev2 ISA!
168 dpavlin 32 o) DROTR32 and similar MIPS64 rev 2 instructions,
169     which have a rotation bit which differs from
170     previous ISAs.
171     o) EI and DI instructions for MIPS64/32 rev 2.
172     NOTE: These are _NOT_ the same as for R5900!
173 dpavlin 24 x) _MAYBE_ TX79 and R5900 actually differ in their
174     opcodes? Check this carefully!
175     o) Dyntrans: Count register updates are probably not 100% correct yet.
176     o) Refactor code for performance and readability/maintainability.
177 dpavlin 28 o) (Re)implement 128-bit loads/stores for R5900.
178 dpavlin 24 o) R4000 and others:
179     x) watchhi/watchlo exceptions, and other exception
180     handling details
181     o) R10000 and others: (R12000, R14000 ?)
182 dpavlin 34 x) The code before the line
183     /* reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK; */
184     in cpu_mips.c is not correct for R10000 according to
185     Lemote's Godson patches for GXemul. TODO: Go through all
186     register definitions according to http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/hdwr/bks/SGI_Developer/books/R10K_UM/sgi_html/t5.Ver.2.0.book_263.html#HEADING334
187     and make sure everything works with R10000.
188     Then test with OpenBSD/sgi?
189 dpavlin 36 x) Entry LO mask (as above).
190 dpavlin 24 x) memory space, exceptions, ...
191     x) use cop0 framemask for tlb lookups
192     (http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/hdwr/bks/SGI_Developer/books/R10K_UM/sgi_html/t5.Ver.2.0.book_284.html)
193    
194 dpavlin 32 SuperH:
195     x) SH4 interrupt controller:
196     x) Implement correct priorities of interrupts
197 dpavlin 34 x) SH4 DMA (0xffa00000)
198     x) SH4 UBC (0xff200000)
199     x) Store queues can copy 32 bytes at a time, there's no need to
200     copy individual 32-bit words. (Performance improvement.)
201 dpavlin 32 x) SH4 BSC (Bus State Controller)
202 dpavlin 34 x) SH4 RTC: Read the host's clock.
203     x) Instruction tracing should include symbols for branch targets,
204     and so on, to make the output more human readable.
205 dpavlin 32 x) NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux?
206     x) Replace pc-relative loads with immediate load, if within the
207     same page. (Similar to the same optimization for ARM.)
208 dpavlin 34 x) Floating point speed!
209 dpavlin 32 x) Floating point exception correctness.
210     x) Think carefully about how to implement SH5/SH64 (for evbsh5).
211 dpavlin 18
212 dpavlin 32 Dreamcast:
213 dpavlin 34 x) G2 DMA
214     x) LAN adapter (dev_mb8696x.c). NetBSD root-on-nfs.
215 dpavlin 32 x) PVR: Lots of stuff. See dev_pvr.c.
216 dpavlin 34 x) GDROM
217     x) Modem
218     x) PCI bridge/bus?
219 dpavlin 32 x) Maple bus:
220     x) Correct controller input
221     x) Mouse input
222 dpavlin 34 x) Software emulation of BIOS calls:
223     x) GD-ROM emulation: Use the GDROM device.
224     x) Use the VGA font as a fake ROM font. (Better than
225     nothing.)
226 dpavlin 32 x) Linux/dreamcast? (The gentoo kernel currently crashes.)
227 dpavlin 34 x) Make as many as possible of the KOS examples run!
228 dpavlin 32 x) More homebrew demos/games.
229 dpavlin 34 x) SPU: Sound emulation (ARM cpu).
230     x) VME processor emulation? "(Sanyo LC8670 "Potato")" according to
231     Wikipedia, LC86K87 according to Comstedt's page. See
232     http://www.maushammer.com/vmu.html for a good description of
233     the differences between LC86104C and the one used in the VME.
234 dpavlin 32
235 dpavlin 30 Transputer:
236     x) Implement support for Helios binaries.
237     x) Stack and register contents at startup?
238     x) Figure out how to boot an entire Helios distribution.
239     x) Implement all instructions. :)
240    
241 dpavlin 32 RCA1802/RCA1805, CHIP8:
242     x) CHIP8 -> RCA180x conversion
243     x) Think about how to do dual-mode, variable-instr-length
244     ISAs, and switch between modes.
245     x) 1805 "extended" opcode -> trigger CHIP8 emulation?
246     That is, all calls 0NNN could point to 0x68 opcodes,
247     which, if running on a 1802 in CHIP8-emulation-mode,
248     would be manually interpreted.
249     x) Better solution:
250     CHIP8 calls to 00xx => handle at high level,
251     calls to 0xxx in general = call 180X machine code
252     (0000 = reboot?)
253     x) 1802 info: http://www.nyx.net/~lturner/public_html/Cosmac.html
254     and: http://www.elf-emulation.com/1802.html
255     x) 1805 extended opcodes: Implement at least disassembly support!
256     x) Keyboard input.
257     x) Sound (beep only).
258     x) Slow-down to correct speed? Wikipedia: "it was usually operated
259     at 3.58 MHz/2 to suit the requirements of the 1861 chip which
260     gave a speed of a little over 100,000 instructions per second"
261     (Note that _CHIP8_ emulation would then be even slower.)
262     x) SCHIP48 (Super) emulation:
263     Some more opcodes, 128x64 framebuffer, larger
264     sprites and fonts.
265    
266 dpavlin 24 Alpha:
267 dpavlin 32 x) OSF1 PALcode, Virtual memory support.
268     x) PALcode replacement! PAL1E etc opcodes...?
269     x) Interrupt/exception/trap handling.
270     x) Floating point exception correctness.
271     x) More work on bootup memory and register contents.
272     x) More Alpha machine types, so it could work with
273     OpenBSD, FreeBSD, and Linux too?
274 dpavlin 24
275     SPARC:
276 dpavlin 32 o) Implement Adress space identifiers; load/stores etc.
277 dpavlin 34 o) Save/restore register windows etc! Both v9 and pre-v9!
278 dpavlin 30 o) Finish the subcc and addcc flag computation code.
279     o) Add more registers (floating point, control regs etc)
280 dpavlin 32 o) Exception/trap handling.
281 dpavlin 28 o) Disassemly of some more instructions?
282 dpavlin 24 o) Are sll etc 32-bit sign-extending or zero-extending?
283     o) Finish the GDB register stuff.
284 dpavlin 32 x) Floating point exception correctness.
285 dpavlin 28 o) SPARC v8, v7 etc?
286 dpavlin 24
287     Debugger:
288     o) How does SMP debugging work? Does it simply use "threads"?
289     What if the guest OS (running on an emulated SMP machine)
290     has a usertask running, with userland threads?
291     o) Try to make the debugger more modular and, if possible, reentrant!
292     o) Remove the emul command? (But show network info if showing
293     machines?)
294 dpavlin 34 o) Evaluate expressions within []? That would allow stuff like
295     cpu[x] where x is an expression.
296 dpavlin 32 o) Settings:
297     x) Special handlers for Write!
298     +) MIPS coproc regs
299     +) Alpha/MIPS/SPARC zero registers
300     +) x86 64/32/16-bit registers
301     x) Value formatter for resulting output.
302 dpavlin 24 o) see src/debugger.c for more
303    
304     POWER/PowerPC:
305 dpavlin 34 x) Fix DECR timer speed, so it matches the host.
306 dpavlin 32 x) NetBSD/prep 3.x triggers a possible bug in the emulator:
307     <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>
308     <ata_get_xfer(0,0xd60cdd30,0,8,..)>
309     <0x26c550(&ata_xfer_pool,2,0,8,..)>
310     <0x35c71c(0x3f27000,0,52,8,..)>
311     <ata_exec_xfer(0xd005e4c8,0x3f27000,0,13,..)>
312     <atastart(0xd005e4c8,0x3f27000,0,13,..)>
313     <__wdccommand_start(0xd005e4c8,0x3f27000,0,13,..)>
314     <bsw1(&prep_isa_io_space_tag,0x800001f6,0,176,..)>
315     [ wdc: write to SDH: 0xb0 (sectorsize 2, lba=1, drive 1, head 0) ]
316     <wdcwait(0xd005e4c8,72,64,0xbb8,..)>
317     <0x198120(0xd005e4c8,72,64,0xbb8,..)>
318     <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
319     <delay(100,0,0,0xbb8,..)>
320     Note: <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
321 dpavlin 24 x) PPC optimizations; instr combs
322 dpavlin 28 x) 64-bit stuff: either Linux on G5, or perhaps some hobbyist
323     version of AIX? (if there exists such a thing)
324 dpavlin 24 x) macppc: adb controller; keyboard (for framebuffer mode)
325     x) make OpenBSD/macppc work (PCI controller stuff)
326 dpavlin 32 x) Floating point exception correctness.
327     x) Alignment exceptions.
328 dpavlin 24
329 dpavlin 34 PReP:
330     Clock time! ("Bad battery blah blah")
331    
332 dpavlin 24 Algor:
333 dpavlin 32 o) Other models than the P5064?
334     o) PCI interrupts... needed for stuff like the tlp NIC?
335 dpavlin 24
336 dpavlin 34 BeBox:
337     o) Interrupts. There seems to be a problem with WDC interrupts
338     "after a short while", although a few interrupts get through?
339     o) Perhaps find a copy of BeOS and try it?
340    
341 dpavlin 32 HPCmips:
342     x) Mouse/pad support! :)
343     x) A NIC? (As a PCMCIA device?)
344    
345     AVR:
346     o) Everything.
347    
348 dpavlin 24 ARM:
349 dpavlin 32 o) See netwinder_reset() in NetBSD; the current "an internal error
350     occured" message after reboot/halt is too ugly.
351     o) ARM "wait"-like instruction?
352 dpavlin 34 o) try to get netbsd/evbarm 3.x or 4.x running (iq80321)
353 dpavlin 24 o) make the xscale counter registers (ccnt) work
354     o) make the ata controller usable for FreeBSD!
355 dpavlin 36 o) Zaurus emulation:
356     x) OpenBSD/zaurus
357     x) NetBSD/zaurus? See the following URL:
358     http://mail-index.netbsd.org/port-arm/2006/11/19/0000.html
359 dpavlin 34 o) Debian/cats crashes because of unimplemented coproc stuff.
360 dpavlin 24 fix this?
361    
362 dpavlin 32 Test machines:
363 dpavlin 34 o) dev_fb block fill and copy
364     o) dev_fb draw characters (from the built-in font)?
365     o) dev_fb input device? mouse pointer coordinates and buttons
366 dpavlin 32 (allow changes in these to cause interrupts as well?)
367 dpavlin 34 o) Redefine the halt() function so that it stops "sometimes
368     soon", i.e. usage in demo code should be:
369 dpavlin 32 for (;;) {
370     halt();
371     }
372    
373     Better CD Image file support:
374     x) Support CD formats that contain more than 1 track, e.g.
375     CDI files (?). These can then contain a mixture of e.g. sound
376     and data tracks, and booting from an ISO filesystem path
377     would boot from [by default] the first data track.
378     (This would make sense for e.g. Dreamcast CD images, or
379     possibly other live-CD formats.)
380    
381     Networking:
382     x) Fix performance problems caused by only allowing a
383     single TCP packet to be unacked.
384     x) Don't hardcode offsets into packets!
385     x) Test with lower than 100 max tcp/udp connections,
386     to make sure that reuse works!
387     x) Make OpenBSD work better as a guest OS!
388     x) DHCP? Debian doesn't actually send DHCP packets, even
389     though it claims to? So it is hard to test.
390     x) Multiple networks per emulation, and let different
391     NICs in machines connect to different networks.
392     x) Support VDE (vde.sf.net)? Easiest/cleanest (before a
393     redesign of the network framework has been done) is
394     probably to connect it using the current (udp) solution.
395     x) Allow SLIP connections, possibly PPP, in addition to
396     ethernet?
397    
398 dpavlin 24 Cache simulation:
399 dpavlin 28 o) Command line flags for:
400     o) CPU endianness?
401     o) Cache sizes? (multiple levels)
402 dpavlin 24 o) Separate from the CPU concept, so that multi-core CPUs sharing
403     e.g. a L2 cache can be simulated (?)
404     o) Instruction cache emulation is easiest (if separate from the
405     data cache); similar hack as the S;I; hack in cpu_dyntrans.c.
406     NOTE: if the architecture has a delay slot, then an instruction
407     slot can actually be executed as 2 instructions.
408     o) Data cache emulation = harder; each arch's load/store routines
409     must include support? running one instruction at a time and
410     having a cpu-dependant lookup function for each instruction
411     is another option (easier to implement, but very very slow).
412    
413     Documentation:
414 dpavlin 32 x) Note about sandboxing/security:
415     Not all emulated instructions fail in the way they would
416     do on real hardware (e.g. a userspace program writing to
417     a system register might work in GXemul, but it would
418     fail on real hardware). Sandbox = contain from the
419     host OS. But the emulated programs will run "less
420     securely".
421     x) Try NetBSD/arc 4.x! (It seems to work with disk images!)
422     x) NetBSD/pmax 4 install instructions: xterm instead of vt100!
423 dpavlin 34 x) BETTER DEVICE EXAMPLES!
424     o) Move away from technical.html to somewhere new.
425     o) DEVICE_TICK
426     o) Implement example devices using interrupts, dyntrans
427     memory access, etc.?
428     x) Document the dyntrans core?
429 dpavlin 32 x) Rewrite the section about experimental devices, after the
430     framebuffer acceleration has been implemented, and demos
431     written. (Symbolic names instead of numbers; example
432     use cases, etc. Mention demo files that use the various
433     features?)
434     x) "a very simple linear framebuffer device (for graphics output)"
435     under "which machines does gxemul emulate" ==> better
436     description?
437     x) Better description on how to set up a cross compiler?
438     Example for MIPS64.
439     o) Automagic documentation generation?
440     x) machines, cpus, devices.
441 dpavlin 24 x) REMEMBER that several machines/devices can be in
442     the same source file!
443     o) Try to rewrite the install instructions for those machines
444 dpavlin 32 that use 3MAX into using CATS or hpcmips? (To remove the need
445     to use a raw ffs partition, using up all of the disk image.)
446 dpavlin 24
447 dpavlin 22 More generic out_of_memory error reporting, and check everywhere!
448     Causes: OpenBSD has low default limits for normal users.
449     Host is 32-bit? (32-bit hosts are limited to 4 GB or less
450     of userspace memory.)
451     You are actually low on RAM. (As trivial as this might sound,
452     Unix systems usually allow processes to allocate virtual
453     memory beyond the amount of RAM in the machine.)
454    
455     The Device subsystem:
456     x) allow devices to be moved and/or changed in size (down to a
457 dpavlin 32 minimum size, etc, or up to a max size); if there is a collision,
458     return false. It is up to the caller to handle this situation!
459     x) NOTE: Translations must be invalidated, both for
460     registering new devices, and for moving existing ones.
461     cpu->invalidate translation caches, for all CPUs that
462     are connected to a specific memory.
463 dpavlin 22 x) keep track of interrupts and busses? actually, allowing any device
464 dpavlin 24 to be a bus might be a nice idea.
465     x) turn interrupt controllers into devices? :-)
466 dpavlin 22 x) refactor various clocks/nvram/cmos into one device?
467    
468     PCI:
469 dpavlin 24 x) last write was ffffffff ==> fix this, it should be used
470     together with a mask to get the correct bits. also, not ALL
471     bits are size bits! (lowest 4 vs lowest 2?)
472 dpavlin 22 x) add support for address fixups
473 dpavlin 32 x) generalize the interrupt routing stuff (lines etc)
474 dpavlin 22
475 dpavlin 32 Clocks and timers:
476     x) DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
477     x) Test the 8253? Right now it doesn't seem to be used?
478     x) NetWinder timeofday is incorrect!
479     x) Cobalt TOD is incorrect!
480     x) Go through all other machines, one by one, and fix them.
481 dpavlin 22
482     Config file parser:
483 dpavlin 24 o) Rewrite it from scratch!
484 dpavlin 22 o) Usage of any expression available through the debugger
485 dpavlin 34 o) Allow interrupt controllers to be added! and interrupts
486     to be used in more ways than before
487 dpavlin 22 o) Support for running debugger commands (like the -c
488     command line option)
489    
490     Floating point layer:
491     o) make it common enough to be used by _all_ emulation modes
492 dpavlin 32 o) implement correct error/exception handling and rounding modes
493     o) implement more helper functions (i.e. add, sub, mul...)
494 dpavlin 22 o) non-IEEE modes (i.e. x86)?
495    
496 dpavlin 14 Userland emulation:
497 dpavlin 22 x) Lots of stuff; freebsd and netbsd (and linux?) syscalls.
498 dpavlin 14 x) Dynamic linking? Hm.
499 dpavlin 12
500 dpavlin 22 Sound:
501     x) generic sound framework
502 dpavlin 32 x) add one or more sound cards as devices; add a testmachine
503     sound card first?
504 dpavlin 34 x) Dreamcast sound? Generic PCI sound cards?
505 dpavlin 12
506 dpavlin 24 ASC SCSI controller:
507     x) NetBSD/arc 2.0 uses the ASC controller in a way which GXemul
508     cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem
509     in NetBSD itself, http://mail-index.netbsd.org/source-changes/
510     2005/11/06/0024.html suggests that.)
511 dpavlin 32 NetBSD 4.x seems to work? :)
512 dpavlin 24
513 dpavlin 22 Caches / memory hierarchies: (this is mostly MIPS-specific)
514     o) src/memory*.c: Implement correct cache emulation for
515     all CPU types. (currently only R2000/R3000 is implemented)
516 dpavlin 28 (per CPU, multiple levels should be possible, associativity etc!)
517 dpavlin 22 o) R2000/R3000 isn't _100%_ correct, just almost correct :)
518     o) Move the -S (fill mem with random) functionality into the
519     memory.c subsystem, not machine.c or wherever it is now
520     o) ECC stuff, simulation of memory errors? (Machine dependent)
521     o) More than 4GB of emulated RAM, when run on a 32-bit host?
522     (using manual swap-out of blocks to disk, ugly)
523     o) A global command line option should be used to turn
524     cache emulation on or off. When off, caches should be
525     faked like they are right now. When on, caches and
526     memory latencies should be emulated as correctly as
527     possible.
528 dpavlin 2
529 dpavlin 22 File/disk/symbol handling:
530 dpavlin 34 o) Make sure that disks can be added/removed during runtime!
531     (Perhaps this needs a reasonably large re-write.)
532 dpavlin 28 o) Remove some of the complexity in file format guessing, for
533     Ultrix kernels that are actually disk images?
534 dpavlin 34 o) Better handling of tape files
535 dpavlin 22 o) Read function argument count and types from binaries? (ELF?)
536 dpavlin 24 o) Better demangling of C++ names. Note: GNU's C++ differs from e.g.
537     Microsoft's C++, so multiple schemes must be possible. See
538     URL at top of src/symbol_demangle.c for more info.
539 dpavlin 2
540 dpavlin 22 Userland ABI emulation:
541     o) see src/useremul.c
542 dpavlin 12
543 dpavlin 22 Better framebuffer and X-windows functionality:
544 dpavlin 32 o) Generalize the update_x1y1x2y2 stuff to an extend-region()
545     function...
546 dpavlin 22 o) -Yx sometimes causes crashes.
547     o) Simple device access to framebuffer_blockcopyfill() etc,
548     and text output (using the built-in fonts), for dev_fb.
549     o) CLEAN UP the ugly event code
550     o) Mouse clicks can be "missed" in the current system; this is
551     not good. They should be put on a stack of some kind.
552     o) More 2D and 3D framebuffer acceleration.
553     o) Non-resizable windows? Or choose scaledown depending
554     on size (and center the image, with a black border).
555     o) Different scaledown on different windows?
556 dpavlin 32 o) Non-integral scale-up? (E.g. 640x480 -> 1024x768)
557 dpavlin 22 o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
558 dpavlin 24 o) Bug reported by Elijah Rutschman on MacOS with weird
559     keys (F5 = cursor down?).
560 dpavlin 22 o) Keyboard and mouse events:
561     x) Do this for more machines than just DECstation
562     x) more X11 cursor keycodes
563     x) Keys like CTRL, ALT, SHIFT do not get through
564     by themselves (these are necessary for example
565     to change the font of an xterm in X in the
566     emulator)
567     o) Generalize the framebuffer stuff by moving _ALL_ X11
568     specific code to src/x11.c!
569 dpavlin 2

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