/[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 24 by dpavlin, Mon Oct 8 16:19:56 2007 UTC revision 38 by dpavlin, Mon Oct 8 16:21:53 2007 UTC
# Line 1  Line 1 
1  $Id: TODO,v 1.292 2006/06/23 09:13:34 debug Exp $  $Id: TODO,v 1.476 2007/04/14 05:39:47 debug Exp $
2    
3  Hm. This file is in random order, and not all parts of it are up-to-date.  Some things, in totally random order, that I'd like to fix:
4    (Some items in this list are probably out-to-date by now.)
5    
6  --------------  Dyntrans:
7            x)  Instruction combination collisions? How to avoid easily...
8  Possible release schedule:          x)  Think about how to do both SHmedia and SHcompact in a reasonable
9                way! (Or AMD64 long/protected/real, for that matter.)
10  0.4.0:          x)  68K emulation; think about how to do variable instruction
11          x)  Quick release, even though performance for non-R3000 MIPS dyntrans              lengths across page boundaries.
12              is really poor. (Assuming everything mentioned in the documentation          x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,
13              works as expected.)              it would be reasonably simple to add; in each individual fast
14                load/store routine = a lot more work, and it would become
15  0.4.1:              kludgy very fast.)
         x)  FIX THE NON-R3000 TRANSLATION CACHE INVALIDATION BOTTLENECKS!  
         x)  Fix the interrupt problems with Ultrix!  
         x)  Find/fix bug which is triggered when building the emulator inside  
             NetBSD/pmax 3.0 inside the emulator!  
   
 0.4.2 ...?  
         x)  Clean-up!  
         x)  Clock framework? Go through all clock devices, make sure they  
             return correct data, and run at correct speeds!  
         x)  Optimizations, continuing on 64-bit issues etc with dyntrans  
16          x)  Dyntrans with SMP... lots of work to be done here.          x)  Dyntrans with SMP... lots of work to be done here.
17          x)  Dyntrans with cache emulation... lots of work here as well.          x)  Dyntrans with cache emulation... lots of work here as well.
18          x)  Actually use the settings object, better debugger stuff, etc.          x)  Remove the concept of base RAM completely; it would be more
19          x)  Wait for new releases of NetBSD, and test with those.              generic to allow RAM devices to be used "anywhere".
   
 --------------  
   
 SMP:  
20          o)  dev_mp doesn't work well with dyntrans yet          o)  dev_mp doesn't work well with dyntrans yet
21          o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans          o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
22            x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,
23                    so that it caches a translation (that is, an instruction
24                    word and the instr_call it was translated to the last
25                    time), so that it doesn't need to do slow
26                    to_be_translated for each end of page?
27            x)  Program Counter statistics:
28                    Per machine? What about SMP? All data to the same file?
29                    A debugger command should be possible to use to enable/
30                    disable statistics gathering.
31                    Configuration file option!
32            x)  Breakpoints:
33                    o) Physical vs virtual addresses!
34                    o) 32-bit vs 64-bit sign extension for MIPS, and others?
35            x)  INVALIDATION should cause translations in _all_ cpus to be
36                invalidated, e.g. on a write to a write-protected page
37                (containing code)
38            x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)
39            x)  Lots of other stuff: see src/cpus/README_DYNTRANS
40            x)  Native code generation backends:
41                    o)  think carefully about this.
42                    o)  simple syntax for emitting opcodes; backend implementation
43                        must be optional, so I don't have to write more code
44                        than necessary. after all, the non-native (C) code should
45                        always work.
46                    o)  convert into native code only after an entire
47                            block has been translated? probably best.
48                    o)  the "almost native" opcodes may be rearranged,
49                        "peep-hole optimized", etc. and then as a separate step
50                        this list of almost native opcodes is written out
51                        as native code.
52                    o)  think about delay slots at the end of a block!
53                    o)  x86/amd64 code generator can be very similar... perhaps
54                    o)  NOTE that generation is per _ABI_, not per host arch!
55                        the configure script must detect ABI!!!
56                    o)  branches to already translated code blocks can
57                            link the blocks together
58                    o)  load/store are the most important to optimize
59    
60    Simple Valgrind-like checks?
61            o)  Mark every address with bits which tell whether or not the address
62                has been written to.
63            o)  What should happen when programs are loaded?  Text/data, bss (zero
64                filled). But stack space and heap is uninitialized.
65            o)  Uninitialized local variables:
66                    A load from a place on the stack which has not previously
67                    been stored to => warning. Increasing the stack pointer using
68                    any available means should reset the memory to uninitialized.
69            o)  If calls to malloc() and free() can be intercepted:
70                    o)  Access to a memory area after free() => warning.
71                    o)  Memory returned by malloc() is marked as not-initialized.
72                    o)  Non-passive, but good to have: Change the argument
73                        given to malloc, to return a slightly larger memory
74                        area, i.e.  margin_before + size + margin_after,
75                        and return the pointer  + margin_before.
76                        Any access to the margin_before or _after space results
77                        in warnings. (free() must be modified to free the
78                        actually allocated address.)
79    
80  MIPS:  MIPS:
81          o)  Fix invalidate_asid so it works well for non-R3000 too!          o)  Nicer MIPS status bits in register dumps.
82          x)  [Re]add an interrupt-asserted bit for MIPS, to speed up          o)  Alignment exceptions.
83              interrupt handling slightly?          o)  Floating point exception correctness.
84          +)  Print a warning on the first reserved instruction.          o)  Fix this? Triggered by NetBSD/sgimips? Hm:
85          +)  Some more work on opcodes.                  to_be_translated(): TODO: unimplemented instruction:
86                    000000000065102c: 00200800 (d)  rot_00  at,zr,0
87            o)  Some more work on opcodes.
88                  x) MIPS64 revision 2.                  x) MIPS64 revision 2.
89                            o)  Find out which actual CPUs implement the rev2 ISA!
90                            o)  DROTR32 and similar MIPS64 rev 2 instructions,
91                                which have a rotation bit which differs from
92                                previous ISAs.
93                            o)  EI and DI instructions for MIPS64/32 rev 2.
94                                NOTE: These are _NOT_ the same as for R5900!
95                  x) _MAYBE_ TX79 and R5900 actually differ in their                  x) _MAYBE_ TX79 and R5900 actually differ in their
96                     opcodes? Check this carefully!                     opcodes? Check this carefully!
97          o)  Dyntrans: Count register updates are probably not 100% correct yet.          o)  Dyntrans: Count register updates are probably not 100% correct yet.
         o)  Dyntrans: SMP correctness  
98          o)  Refactor code for performance and readability/maintainability.          o)  Refactor code for performance and readability/maintainability.
99          o)  Instruction combinations? Possible candidates (but profile first!):          o)  (Re)implement 128-bit loads/stores for R5900.
                 o)  multiple loads/stores in a row  
                 o)  strlen, memset loops etc  
                 o)  compare + branch  
         o)  DROTR32 and similar MIPS64 rev 2 instructions, which have  
             a rotation bit which differs from previous ISAs.  
         o)  EI and DI instructions for MIPS64/32 rev 2. NOTE: These are  
             _NOT_ the same as for R5900!  
100          o)  R4000 and others:          o)  R4000 and others:
101                  x)  watchhi/watchlo exceptions, and other exception                  x)  watchhi/watchlo exceptions, and other exception
102                      handling details                      handling details
103          o)  R10000 and others:  (R12000, R14000 ?)          o)  R10000 and others:  (R12000, R14000 ?)
104                    x)  The code before the line
105                            /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */
106                        in cpu_mips.c is not correct for R10000 according to
107                        Lemote's Godson patches for GXemul. TODO: Go through all
108                        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
109                        and make sure everything works with R10000.
110                        Then test with OpenBSD/sgi?
111                    x)  Entry LO mask (as above).
112                  x)  memory space, exceptions, ...                  x)  memory space, exceptions, ...
113                  x)  use cop0 framemask for tlb lookups                  x)  use cop0 framemask for tlb lookups
114                      (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)                      (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)
115    
116  Dyntrans:  SuperH:
117          x)  Move the mips_init_64bit_dummy_tables() etc calls into          x)  SH4 interrupt controller:
118              src/cpu.c, for all 64-bit cpus?                  x)  MASKING should be possible!
119          x)  64-bit "phystranslation" lookup as in 32-bit mode? Would probably          x)  SH4 DMA (0xffa00000)
120                  help performance a bit.          x)  SH4 UBC (0xff200000)
121          x)  Common fatal_abort() function, which drops into the debugger          x)  SH4 timers are going too fast!
122                  without continuing.          x)  Store queues can copy 32 bytes at a time, there's no need to
123          x)  INVALIDATION should cause translations in _all_ cpus to be              copy individual 32-bit words. (Performance improvement.)
124              invalidated, e.g. on a write to a write-protected page          x)  SH4 BSC (Bus State Controller)
125              (containing code)          x)  Instruction tracing should include symbols for branch targets,
126          x)  better (formally defined) instr call statistics (-s command              and so on, to make the output more human readable.
127              line option?), multiple different types? (virtual pc, physical pc)          x)  SH3-specific devices: Pretty much everything!
128          x)  Call/return hints?          x)  NetBSD/evbsh3, mmeye, hpcsh! Linux?
129          x)  16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)          x)  Replace pc-relative loads with immediate load, if within the
130          x)  H8?              same page. (Similar to the same optimization for ARM.)
131          x)  Lots of other stuff: see src/cpus/README_DYNTRANS          x)  Floating point speed!
132          x)  true recompilation backend? think carefully about this,          x)  Floating point exception correctness.
133              experiment in a separate project (not in GXemul)          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).
134          x)  Remove the dyntrans_alignment_check functionality; although  
135              it gives slightly higher peformance sometimes, it increases  Landisk SH4:
136              the complexity of the code too much!          x)  When NetBSD/landisk 4.0 and OpenBSD/landisk 4.1 have been
137                released, test to see if they work. (If so, update documentation,
138                guestos + index, and set stable=1 in machine_landisk.c.)
139    
140    Dreamcast:
141            x)  G2 DMA
142            x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.
143            x)  PVR:  Lots of stuff. See dev_pvr.c.
144            x)  Better GDROM support
145            x)  Modem
146            x)  PCI bridge/bus?
147            x)  Maple bus:
148                    x)  Correct controller input
149                    x)  Mouse input
150            x)  Software emulation of BIOS calls:
151                    x)  GD-ROM emulation: Use the GDROM device.
152                    x)  Use the VGA font as a fake ROM font. (Better than
153                        nothing.)
154            x)  Make as many as possible of the KOS examples run!
155            x)  More homebrew demos/games.
156            x)  SPU: Sound emulation (ARM cpu).
157            x)  VME processor emulation? "(Sanyo LC8670 "Potato")" according to
158                Wikipedia, LC86K87 according to Comstedt's page. See
159                http://www.maushammer.com/vmu.html for a good description of
160                the differences between LC86104C and the one used in the VME.
161    
162  Alpha:  Alpha:
163          o)  Virtual memory (tlbs etc)          x)  OSF1 PALcode, Virtual memory support.
164          o)  Get {NetBSD,OpenBSD,Linux}/alpha booting. :)          x)  PALcode replacement! PAL1E etc opcodes...?
165            x)  Interrupt/exception/trap handling.
166  SPARC:          x)  Floating point exception correctness.
167          o)  Add all registers (floating point, control regs etc)          x)  More work on bootup memory and register contents.
168          o)  Save/restore register windows etc!          x)  More Alpha machine types, so it could work with
169          o)  Disassemly of some more instructions.              OpenBSD, FreeBSD, and Linux too?
170    
171    SPARC (both the ISA and the machines):
172            o)  Implement Adress space identifiers; load/stores etc.
173            o)  Exception/trap/interrupt handling.
174            o)  Save/restore register windows etc! Both v9 and pre-v9!
175            o)  Finish the subcc and addcc flag computation code.
176            o)  Add more registers (floating point, control regs etc)
177            o)  Disassemly of some more instructions?
178          o)  Are sll etc 32-bit sign-extending or zero-extending?          o)  Are sll etc 32-bit sign-extending or zero-extending?
179          o)  Finish the cmp (subcc) flag computation code.          o)  Floating point exception correctness.
180          o)  Finish the GDB register stuff.          o)  SPARC v8, v7 etc?
181            o)  More machine modes and devices.
182    
183  Debugger:  Debugger:
184          o)  How does SMP debugging work? Does it simply use "threads"?          o)  How does SMP debugging work? Does it simply use "threads"?
# Line 102  Debugger: Line 187  Debugger:
187          o)  Try to make the debugger more modular and, if possible, reentrant!          o)  Try to make the debugger more modular and, if possible, reentrant!
188          o)  Remove the emul command? (But show network info if showing          o)  Remove the emul command? (But show network info if showing
189                  machines?)                  machines?)
190          o)  Generalize the expression evaluator. (debugger_expr.c?)          o)  Evaluate expressions within []? That would allow stuff like
191                  settable variables      ("show nr of instructions on average")                  cpu[x] where x is an expression.
192                  emul[x]                 defaults to current emul          o)  Settings:
193                  machine[x]              defaults to current machine                  x)  Special handlers for Write!
194                  cpu[x]                  defaults to currently focused cpu                          +)  MIPS coproc regs
195                  registers               cpu arch dependent (#-prefix)                          +)  Alpha/MIPS/SPARC zero registers
196                  symbols                 @-prefix                          +)  x86 64/32/16-bit registers
197                  numeric constants       decimal, hex, and octal ($-prefix)                  x)  Value formatter for resulting output.
                 boolean                 yes,no, true,false  
                 operators (+ - * / % & | ^ !)  
                 parentheses for grouping subexpressions  
                 NOTE: the change from % to # for register prefix!  
                 examples:  
                                 emul[0].machine[2].cpu[0].pc  
                                 machine[test2].cpu[1].ra = main  
                                 settings.show_trace_tree = yes  
   
                 Settings:  
                         o)  Remove a setting.  
                         o)  Read/write a setting given a name. (Read as  
                             string and/or int64_t simultaneously?)  
   
                 Help command should have subsections! One for "expressions",  
                 mirrored in the documentation, but the internal help should  
                 be the one that should be considered correct.  
198          o)  see src/debugger.c for more          o)  see src/debugger.c for more
199    
200  POWER/PowerPC:  POWER/PowerPC:
201            x)  Fix DECR timer speed, so it matches the host.
202            x)  NetBSD/prep 3.x triggers a possible bug in the emulator:
203                <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>
204                  <ata_get_xfer(0,0xd60cdd30,0,8,..)>
205                    <0x26c550(&ata_xfer_pool,2,0,8,..)>
206                    <0x35c71c(0x3f27000,0,52,8,..)>
207                  <ata_exec_xfer(0xd005e4c8,0x3f27000,0,13,..)>
208                    <atastart(0xd005e4c8,0x3f27000,0,13,..)>
209                      <__wdccommand_start(0xd005e4c8,0x3f27000,0,13,..)>
210                        <bsw1(&prep_isa_io_space_tag,0x800001f6,0,176,..)>
211                    [ wdc: write to SDH: 0xb0 (sectorsize 2, lba=1, drive 1, head 0) ]
212                        <wdcwait(0xd005e4c8,72,64,0xbb8,..)>
213                          <0x198120(0xd005e4c8,72,64,0xbb8,..)>
214                            <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
215                            <delay(100,0,0,0xbb8,..)>
216                Note: <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
217          x)  PPC optimizations; instr combs          x)  PPC optimizations; instr combs
218          x)  64-bit stuff          x)  64-bit stuff: either Linux on G5, or perhaps some hobbyist
219          x)  find and fix the bug which causes NetBSD/macppc to fail after                  version of AIX? (if there exists such a thing)
             an install!  
220          x)  macppc: adb controller; keyboard (for framebuffer mode)          x)  macppc: adb controller; keyboard (for framebuffer mode)
221          x)  make OpenBSD/macppc work (PCI controller stuff)          x)  make OpenBSD/macppc work (PCI controller stuff)
222            x)  Floating point exception correctness.
223            x)  Alignment exceptions.
224    
225    PReP:
226            x)  Clock time! ("Bad battery blah blah")
227    
228  Algor:  Algor:
229          PCI and ISA and LOCAL interrupts! --> wdc could start working          o)  Other models than the P5064?
230          Add interrupt controller in dev_algor.c.          o)  PCI interrupts... needed for stuff like the tlp NIC?
231    
232    BeBox:
233            o)  Interrupts. There seems to be a problem with WDC interrupts
234                "after a short while", although a few interrupts get through?
235            o)  Perhaps find a copy of BeOS and try it?
236    
237    HPCmips:
238            x)  Mouse/pad support! :)
239            x)  A NIC? (As a PCMCIA device?)
240    
241    AVR:
242            o)  Everything.
243    
244  ARM:  ARM:
245          o)  try to get netbsd/evbarm 3.x running (iq80321)          o)  See netwinder_reset() in NetBSD; the current "an internal error
246                occured" message after reboot/halt is too ugly.
247            o)  ARM "wait"-like instruction?
248            o)  try to get netbsd/evbarm 3.x or 4.x running (iq80321)
249          o)  make the xscale counter registers (ccnt) work          o)  make the xscale counter registers (ccnt) work
250          o)  make the ata controller usable for FreeBSD!          o)  make the ata controller usable for FreeBSD!
251          o)  zaurus for openbsd...          o)  Zaurus emulation:
252          o)  debian/cats crashes because of unimplemented coproc stuff.                  x)  OpenBSD/zaurus
253                    x)  NetBSD/zaurus? See the following URL:
254                        http://mail-index.netbsd.org/port-arm/2006/11/19/0000.html
255            o)  Debian/cats crashes because of unimplemented coproc stuff.
256              fix this?              fix this?
257    
258    Test machines:
259            o)  dev_fb block fill and copy
260            o)  dev_fb draw characters (from the built-in font)?
261            o)  dev_fb input device? mouse pointer coordinates and buttons
262                    (allow changes in these to cause interrupts as well?)
263            o)  Redefine the halt() function so that it stops "sometimes
264                soon", i.e. usage in demo code should be:
265                    for (;;) {
266                            halt();
267                    }
268    
269    Better CD Image file support:
270            x)  Support CD formats that contain more than 1 track, e.g.
271                CDI files (?). These can then contain a mixture of e.g. sound
272                and data tracks, and booting from an ISO filesystem path
273                would boot from [by default] the first data track.
274                (This would make sense for e.g. Dreamcast CD images, or
275                possibly other live-CD formats.)
276    
277    Networking:
278            x)  Redesign of the networking subsystem, at least the NAT translation
279                    part. The current way of allowing raw ethernet frames to be
280                    transfered to/from the emulator via UDP should probably be
281                    extended to allow the frames to be transmitted other ways as
282                    well.
283            x)  Also adding support for connecting ttys (either to xterms, or to
284                    pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).
285            x)  Documentation updates (!) are very important, making it easier to
286                    use the (already existing) network emulation features.
287            x)  Fix performance problems caused by only allowing a
288                single TCP packet to be unacked.
289            x)  Don't hardcode offsets into packets!
290            x)  Test with lower than 100 max tcp/udp connections,
291                to make sure that reuse works!
292            x)  Make OpenBSD work better as a guest OS!
293            x)  DHCP? Debian doesn't actually send DHCP packets, even
294                    though it claims to? So it is hard to test.
295            x)  Multiple networks per emulation, and let different
296                NICs in machines connect to different networks.
297            x)  Support VDE (vde.sf.net)? Easiest/cleanest (before a
298                redesign of the network framework has been done) is
299                probably to connect it using the current (udp) solution.
300            x)  Allow SLIP connections, possibly PPP, in addition to
301                ethernet?
302    
303  Cache simulation:  Cache simulation:
304            o)  Command line flags for:
305                    o)  CPU endianness?
306                    o)  Cache sizes? (multiple levels)
307          o)  Separate from the CPU concept, so that multi-core CPUs sharing          o)  Separate from the CPU concept, so that multi-core CPUs sharing
308              e.g. a L2 cache can be simulated (?)              e.g. a L2 cache can be simulated (?)
309          o)  Instruction cache emulation is easiest (if separate from the          o)  Instruction cache emulation is easiest (if separate from the
# Line 162  Cache simulation: Line 316  Cache simulation:
316              is another option (easier to implement, but very very slow).              is another option (easier to implement, but very very slow).
317    
318  Documentation:  Documentation:
319          o)  machines, cpus, devices.          x)  Note about sandboxing/security:
320          o)  Automagic documentation generation:                  Not all emulated instructions fail in the way they would
321                    do on real hardware (e.g. a userspace program writing to
322                    a system register might work in GXemul, but it would
323                    fail on real hardware).  Sandbox = contain from the
324                    host OS. But the emulated programs will run "less
325                    securely".
326            x)  Try NetBSD/arc 4.x! (It seems to work with disk images!)
327            x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!
328            x)  BETTER DEVICE EXAMPLES!
329                    o)  Move away from technical.html to somewhere new.
330                    o)  DEVICE_TICK
331                    o)  Implement example devices using interrupts, dyntrans
332                        memory access, etc.?
333            x)  Document the dyntrans core?
334            x)  Rewrite the section about experimental devices, after the
335                framebuffer acceleration has been implemented, and demos
336                written. (Symbolic names instead of numbers; example
337                use cases, etc. Mention demo files that use the various
338                features?)
339            x)  "a very simple linear framebuffer device (for graphics output)"
340                under "which machines does gxemul emulate" ==> better
341                description?
342            x)  Better description on how to set up a cross compiler?
343                Example for MIPS64.
344            o)  Automagic documentation generation?
345                    x)  machines, cpus, devices.
346                  x)  REMEMBER that several machines/devices can be in                  x)  REMEMBER that several machines/devices can be in
347                          the same source file!                          the same source file!
348          o)  Try to rewrite the install instructions for those machines          o)  Try to rewrite the install instructions for those machines
349              that use 3MAX into using CATS? (To remove the need to a raw              that use 3MAX into using CATS or hpcmips? (To remove the need
350              ffs partition using up all of the disk image.)              to use a raw ffs partition, using up all of the disk image.)
351    
352  More generic out_of_memory error reporting, and check everywhere!  More generic out_of_memory error reporting, and check everywhere!
353          Causes: OpenBSD has low default limits for normal users.          Causes: OpenBSD has low default limits for normal users.
# Line 178  More generic out_of_memory error reporti Line 357  More generic out_of_memory error reporti
357                  Unix systems usually allow processes to allocate virtual                  Unix systems usually allow processes to allocate virtual
358                  memory beyond the amount of RAM in the machine.)                  memory beyond the amount of RAM in the machine.)
359    
 Breakpoints: 32-bit vs 64-bit sign extension for MIPS, warnings, etc.  
         Use the debugger's symbolic name stuff. (which will have to be  
         extended soon to support stuff like  "2*x + symbol + y" etc. cool  
         stuff)  
   
 Sprite (guest OS for DECstation emulation)  
         x)  Timing problems during bootup?  
   
360  The Device subsystem:  The Device subsystem:
361          x)  allow devices to be moved and/or changed in size (down to a          x)  allow devices to be moved and/or changed in size (down to a
362              minimum size, etc, or up to a max size)              minimum size, etc, or up to a max size); if there is a collision,
363                return false. It is up to the caller to handle this situation!
364            x)  NOTE: Translations must be invalidated, both for
365                registering new devices, and for moving existing ones.
366                cpu->invalidate translation caches, for all CPUs that
367                are connected to a specific memory.
368          x)  keep track of interrupts and busses? actually, allowing any device          x)  keep track of interrupts and busses? actually, allowing any device
369              to be a bus might be a nice idea.              to be a bus might be a nice idea.
370          x)  turn interrupt controllers into devices? :-)          x)  turn interrupt controllers into devices? :-)
371          x)  refactor various clocks/nvram/cmos into one device?          x)  refactor various clocks/nvram/cmos into one device?
372    
 Clocks:  
         x)  General framework for automagic clock adjustment for _all_  
             kinds of clocks and timers. (Which should be possible to turn  
             off, of course, like the way DECstation emulation works now.)  
   
373  PCI:  PCI:
374            x)  Pretty much everything related to runtime configuration, device
375                slots, interrupts, etc must be redesigned/cleaned up. The current
376                code is very hardcoded and ugly.
377            o)  Allow cards to be added/removed during runtime more easily.
378            o)  Allow cards to be enabled/disabled (i/o ports, etc, like
379                NetBSD needs for disk controller detection).
380            o)  Allow devices to be moved in memory during runtime.
381            o)  Interrupts per PCI slot, etc. (A-D).
382            o)  PCI interrupt controller logic... very hard to get right,
383                because these differ a lot from one machine to the next.
384          x)  last write was ffffffff ==> fix this, it should be used          x)  last write was ffffffff ==> fix this, it should be used
385              together with a mask to get the correct bits. also, not ALL              together with a mask to get the correct bits. also, not ALL
386              bits are size bits! (lowest 4 vs lowest 2?)              bits are size bits! (lowest 4 vs lowest 2?)
387          x)  add support for address fixups          x)  add support for address fixups
388          x)  generalize the interrupt routing stuff (lines etc). this should          x)  generalize the interrupt routing stuff (lines etc)
             be per machine? or per bus, that's better  
         x)  add a "pcn" NIC (AMD PCnet32 Lance 79c970 (PCI 1022:2000)),  
             could be useful for several machine modes (Malta, Algor, evbarm,  
             hp700?, macppc, etc.)  
   
 Network layer:  
         o)  DHCP (for Debian and BSD installers :-)  
         o)  increase performance  
         o)  don't rely on NetBSD-ish usage  
         o)  Multiple networks per emulation, and let different  
             NICs in machines connect to different networks.  
         o)  many other issues: see src/net.c  
389    
390  Busses:  Clocks and timers:
391          o)  Redesign the entire "mainbus" concept!          x)  Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)
392          o)  Busses should be placed in a hierarchical tree!          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
393          o)  Easily configurable interrupt routing in SMP systems.          x)  Test the 8253? Right now it doesn't seem to be used?
394          o)  Specific clock/bus speeds, cpu speeds etc.          x)  NetWinder timeofday is incorrect!
395          o)  Synchronization over network? or at least in dyntrans within          x)  Cobalt TOD is incorrect!
396              one emulated machine          x)  Go through all other machines, one by one, and fix them.
         o)  dev->bus: TurboChannel, PCMCIA, ADB?  
397    
398  Config file parser:  Config file parser:
399          o)  Rewrite it from scratch!          o)  Rewrite it from scratch!
400          o)  Usage of any expression available through the debugger          o)  Usage of any expression available through the debugger
401            o)  Allow interrupt controllers to be added! and interrupts
402                to be used in more ways than before
403          o)  Support for running debugger commands (like the -c          o)  Support for running debugger commands (like the -c
404              command line option)              command line option)
405    
406  Floating point layer:  Floating point layer:
407          o)  make it common enough to be used by _all_ emulation modes          o)  make it common enough to be used by _all_ emulation modes
408          o)  implement more stuff          o)  implement correct error/exception handling and rounding modes
409            o)  implement more helper functions (i.e. add, sub, mul...)
410          o)  non-IEEE modes (i.e. x86)?          o)  non-IEEE modes (i.e. x86)?
411    
412  Userland emulation:  Userland emulation:
413          x)  Lots of stuff; freebsd and netbsd (and linux?) syscalls.          x)  Dynamic linking!
414          x)  Dynamic linking? Hm.          x)  Lots of stuff; freebsd, netbsd, linux, ... syscalls.
415            x)  Initial register/stack contents (environment, command line args).
416            x)  Return value (from main).
417            x)  mmap emulation layer
418            x)  errno emulation layer
419            x)  struct conversions for may syscalls
420    
421  Sound:  Sound:
422          x)  generic sound framework          x)  generic sound framework
423          x)  add one or more sound cards as devices          x)  add one or more sound cards as devices; add a testmachine
424                sound card first?
425            x)  Dreamcast sound? Generic PCI sound cards?
426    
427  ASC SCSI controller:  ASC SCSI controller:
428          x)  NetBSD/arc 2.0 uses the ASC controller in a way which GXemul          x)  NetBSD/arc 2.0 uses the ASC controller in a way which GXemul
429              cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem              cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem
430              in NetBSD itself, http://mail-index.netbsd.org/source-changes/              in NetBSD itself, http://mail-index.netbsd.org/source-changes/
431              2005/11/06/0024.html suggests that.)              2005/11/06/0024.html suggests that.)
432                NetBSD 4.x seems to work? :)
433    
434  Caches / memory hierarchies: (this is mostly MIPS-specific)  Caches / memory hierarchies: (this is mostly MIPS-specific)
         o)  MIPS coproc.c: bits in config registers should reflect  
             correct cache sizes for _all_ CPU types. (currently only  
             implemented for R4000, R1x000, and a few others)  
435          o)  src/memory*.c: Implement correct cache emulation for          o)  src/memory*.c: Implement correct cache emulation for
436              all CPU types. (currently only R2000/R3000 is implemented)              all CPU types. (currently only R2000/R3000 is implemented)
437              (per CPU, multiple levels should be possible,              (per CPU, multiple levels should be possible, associativity etc!)
             associativity etc!)  
438          o)  R2000/R3000 isn't _100%_ correct, just almost correct :)          o)  R2000/R3000 isn't _100%_ correct, just almost correct :)
439          o)  Move the -S (fill mem with random) functionality into the          o)  Move the -S (fill mem with random) functionality into the
440              memory.c subsystem, not machine.c or wherever it is now              memory.c subsystem, not machine.c or wherever it is now
# Line 273  Caches / memory hierarchies: (this is mo Line 448  Caches / memory hierarchies: (this is mo
448              possible.              possible.
449    
450  File/disk/symbol handling:  File/disk/symbol handling:
451          o)  Better handling of tape files          o)  Make sure that disks can be added/removed during runtime!
452                (Perhaps this needs a reasonably large re-write.)
453            o)  Remove some of the complexity in file format guessing, for
454                    Ultrix kernels that are actually disk images?
455            o)  Better handling of tape files      
456          o)  Read function argument count and types from binaries? (ELF?)          o)  Read function argument count and types from binaries? (ELF?)
457          o)  Better demangling of C++ names. Note: GNU's C++ differs from e.g.          o)  Better demangling of C++ names. Note: GNU's C++ differs from e.g.
458              Microsoft's C++, so multiple schemes must be possible. See              Microsoft's C++, so multiple schemes must be possible. See
# Line 282  File/disk/symbol handling: Line 461  File/disk/symbol handling:
461  Userland ABI emulation:  Userland ABI emulation:
462          o)  see src/useremul.c          o)  see src/useremul.c
463    
 Terminal/console:  
         o)  allow emulated serial ports to be connected to the outside  
             world in a more generic way, or even to other emulated  
             machines(?)  
   
 Save state of the whole emulated machine, to be able to load it back  
         in later?  (Memory, all device's states, all registers and  
         so on.  Like taking a snapshot. (SimOS seems to do this,  
         according to its website.))  
   
464  Better framebuffer and X-windows functionality:  Better framebuffer and X-windows functionality:
465            o)  Generalize the update_x1y1x2y2 stuff to an extend-region()
466                function...
467          o)  -Yx sometimes causes crashes.          o)  -Yx sometimes causes crashes.
468          o)  Simple device access to framebuffer_blockcopyfill() etc,          o)  Simple device access to framebuffer_blockcopyfill() etc,
469              and text output (using the built-in fonts), for dev_fb.              and text output (using the built-in fonts), for dev_fb.
# Line 303  Better framebuffer and X-windows functio Line 474  Better framebuffer and X-windows functio
474          o)  Non-resizable windows?  Or choose scaledown depending          o)  Non-resizable windows?  Or choose scaledown depending
475                  on size (and center the image, with a black border).                  on size (and center the image, with a black border).
476          o)  Different scaledown on different windows?          o)  Different scaledown on different windows?
477            o)  Non-integral scale-up? (E.g. 640x480 -> 1024x768)
478          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
479          o)  Bug reported by Elijah Rutschman on MacOS with weird          o)  Bug reported by Elijah Rutschman on MacOS with weird
480              keys (F5 = cursor down?).              keys (F5 = cursor down?).
# Line 316  Better framebuffer and X-windows functio Line 488  Better framebuffer and X-windows functio
488          o)  Generalize the framebuffer stuff by moving _ALL_ X11          o)  Generalize the framebuffer stuff by moving _ALL_ X11
489                  specific code to src/x11.c!                  specific code to src/x11.c!
490    
 Statistics:  (this could be interesting)  
         o)  Save to file and show graphics. It should be possible to  
             run gxemul after a simulation to just show the graphics,  
             or convert to a .ppm or .tga or similar.  
         o)  memory accesses (to measure cache efficiency and  
                 page coloring efficiency)  
         o)  nr of simultaneous ASIDs in use in the TLB, for MIPS  
         o)  percentage of time spent in different "states", such as  
             running userland code, kernel code, or idling (for CPUs  
             that have such an instruction, or whenever the PC is  
             inside a specific idle-function (address range)).  
             Possible additional state (for example on R3000): caches  
             disabled.  
         o)  position of read/write on (SCSI) disks  
   
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