/[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 30 by dpavlin, Mon Oct 8 16:20:40 2007 UTC revision 34 by dpavlin, Mon Oct 8 16:21:17 2007 UTC
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1  $Id: TODO,v 1.343 2006/08/14 18:46:30 debug Exp $  $Id: TODO,v 1.453 2007/02/19 01:34:42 debug Exp $
2    
3  Hm. This file is in random order, and not all parts of it are up-to-date.  -------------------------------------------------------------------------------
4    
5    Fix after the 0.4.4 release:
6            Fix the PowerPC DECR interrupt speed!
7    
8  Implementation:  -------------------------------------------------------------------------------
         x)  ARM "wait"-like instruction.  
         x)  CLOCK FRAMEWORK!  
         x)  Mouse support for NetBSD/pmax 4.x!  
         x)  See netwinder_reset() in NetBSD; the current "an internal error  
             occured" message after reboot/halt is too ugly.  
         x)  64-bit ranges in src/cpus/memory_mips_v2p.c  
         x)  Revert the dyntrans page template experiment? Hm.  
         x)  Refactor the cpu type detection/initialization/listing.  
                 Macro, which can be used as long as the cpu definitions  
                 contain a 'name'?  
         x)  Testmachine includes:  
                 + dev_fb block fill and copy  
                 + dev_fb draw characters (from the built-in font)?  
                 + dev_fb input device? mouse pointer coordinates and buttons  
                         (allow changes in these to cause interrupts as well?)  
                 + Redefine the halt() function so that it stops "sometimes  
                   soon", i.e. usage in demo code should be:  
                         for (;;) {  
                                 halt();  
                         }  
         x)  Continue on SPARC emulation  
                 + Enable it in the configure script as soon as it can  
                   run all the demo programs.  
         x)  Continue on Alpha emulation  (virtual memory, etc). Cleanup.  
         x)  Nicer MIPS status bits in register dumps.  
         x)  Alignment exceptions (MIPS, PPC, ARM?, ...)  
         x)  Rewrite the networking stack; make OpenBSD work better as a guest  
             OS, fix the performance problems, make Linux work with DHCP, etc.  
             Support VDE (vde.sf.net)? Allow SLIP connections, possibly PPP,  
             in addition to ethernet?  
         x)  Implement more ethernet NICs.  
         x)  IOP (I2O) device?  
9    
10  Documentation:  Possible (relatively large) work packages to concentrate on in the future:
11          x)  "Install netbsd/pmax first" => only use the install kernel?  
12          x)  Rewrite the section about experimental devices, after the    x)  SMP:
13              framebuffer acceleration has been implemented, and demos          Get SMP working again. It is pretty much broken since I started
14              written. (Symbolic names instead of numbers; example          the conversion from the old bintrans system to the new dyntrans system.
15              use cases, etc. Mention demo files that use the various          Add better Test machine demos for SMP in the demos directory.
16              features?)  
17          x)  "a very simple linear framebuffer device (for graphics output)"    x)  Network:
18              under "which machines does gxemul emulate" ==> better          Redesign of the networking subsystem, at least the NAT translation
19              description?          part. The current way of allowing raw ethernet frames to be
20          x)  Better description on how to set up a cross compiler?          transfered to/from the emulator via UDP should probably be extended
21              Example for MIPS64.          to allow the frames to be transmitted other ways as well.
22            Also adding support for connecting ttys (either to xterms, or to
23            pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).
24    
25      x)  PCI:
26            Pretty much everything related to runtime configuration, device
27            slots, interrupts, whatever. The current code is very hardcoded
28            and ugly.
29    
30      x)  Debugging:
31            Think more about SMP debugging, etc. Right now, the
32            debugger is a mess. Also, a better connection to GDB would be
33            very nice to have.
34    
35      x)  Userland emulation:
36            Primary goals would be NetBSD and Linux syscall emulation.
37    
38    And of course, there are _LOTS_ of minor TODOs spread out throughout
39    the source code, which must be fixed sooner or later.
40    
41    -------------------------------------------------------------------------------
42    
43    Some other things, in random order, that I'd like to fix: (Some items in
44    this list are probably out-to-date by now.)
45    
46  Long-term design:  Dyntrans:
47          x)  Instruction combination collisions? How to avoid easily...          x)  Instruction combination collisions? How to avoid easily...
48          x)  Think about how to do both SHmedia and SHcompact in a reasonable          x)  Think about how to do both SHmedia and SHcompact in a reasonable
49              way!              way! (Or AMD64 long/protected/real, for that matter.)
50          o)  Actually use the settings object, better debugger stuff, etc!          x)  68K emulation; think about how to do variable instruction
51          o)  Debugger command for enabling/disabling instruction statistics              lengths across page boundaries.
             during runtime.   machine.statistics = on|off  
         x)  MAINBUS REDESIGN!  
         x)  PCI redesign... I need to read up on how PCI actually works :)  
         x)  Clock framework! Go through all clock devices, make sure they  
             return correct data, and run at correct speeds!  
52          x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,          x)  Dyntrans with valgrind-inspired memory checker. (In memory_rw,
53              it would be reasonably simple to add; in each individual fast              it would be reasonably simple to add; in each individual fast
54              load/store routine = a lot more work, and it would become              load/store routine = a lot more work, and it would become
55              kludgy very fast.)              kludgy very fast.)
56          x)  Dyntrans with SMP... lots of work to be done here.          x)  Dyntrans with SMP... lots of work to be done here.
57          x)  Dyntrans with cache emulation... lots of work here as well.          x)  Dyntrans with cache emulation... lots of work here as well.
58          x)  Reimplement the config file parser from scratch.          o)  dev_mp doesn't work well with dyntrans yet
59            o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans
60  -------------------------------------------------------------------------------          x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,
61                    so that it caches a translation (that is, an instruction
62                    word and the instr_call it was translated to the last
63                    time), so that it doesn't need to do slow
64                    to_be_translated for each end of page?
65            x)  Program Counter statistics:
66                    Per machine? What about SMP? All data to the same file?
67                    A debugger command should be possible to use to enable/
68                    disable statistics gathering.
69                    Configuration file option!
70            x)  Breakpoints:
71                    o) Physical vs virtual addresses!
72                    o) 32-bit vs 64-bit sign extension for MIPS, and others?
73            x)  INVALIDATION should cause translations in _all_ cpus to be
74                invalidated, e.g. on a write to a write-protected page
75                (containing code)
76            x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)
77            x)  Lots of other stuff: see src/cpus/README_DYNTRANS
78            x)  true recompilation backend? think carefully about this.
79                    o)  abstract syntax for emitting opcopdes
80                    o)  convert into native code only after an entire
81                            block has been translated? probably best.
82                    o)  x86/amd64 code generator can be very similar... perhaps
83                    o)  branches to already translated code blocks can
84                            link the blocks together
85                    o)  load/store are the most important.
86    
87  Simple Valgrind-like checks?  Simple Valgrind-like checks?
88          o)  Mark every address with bits which tell whether or not the address          o)  Mark every address with bits which tell whether or not the address
# Line 91  Simple Valgrind-like checks? Line 104  Simple Valgrind-like checks?
104                      in warnings. (free() must be modified to free the                      in warnings. (free() must be modified to free the
105                      actually allocated address.)                      actually allocated address.)
106    
 SMP:  
         o)  dev_mp doesn't work well with dyntrans yet  
         o)  In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans  
   
107  MIPS:  MIPS:
108          +)  Some more work on opcodes.          o)  Nicer MIPS status bits in register dumps.
109                  x) The "wait" instruction. How to implement this functionality?          o)  Alignment exceptions.
110                          (SMP, non-MIPS, interrupt correctness, host idling, ...)          o)  Floating point exception correctness.
111            o)  Fix this? Triggered by NetBSD/sgimips? Hm:
112                    to_be_translated(): TODO: unimplemented instruction:
113                    000000000065102c: 00200800 (d)  rot_00  at,zr,0
114            o)  Some more work on opcodes.
115                  x) MIPS64 revision 2.                  x) MIPS64 revision 2.
116                          o)  Find out which actual CPUs implement the rev2 ISA!                          o)  Find out which actual CPUs implement the rev2 ISA!
117                            o)  DROTR32 and similar MIPS64 rev 2 instructions,
118                                which have a rotation bit which differs from
119                                previous ISAs.
120                            o)  EI and DI instructions for MIPS64/32 rev 2.
121                                NOTE: These are _NOT_ the same as for R5900!
122                  x) _MAYBE_ TX79 and R5900 actually differ in their                  x) _MAYBE_ TX79 and R5900 actually differ in their
123                     opcodes? Check this carefully!                     opcodes? Check this carefully!
124          o)  Dyntrans: Count register updates are probably not 100% correct yet.          o)  Dyntrans: Count register updates are probably not 100% correct yet.
125          o)  Refactor code for performance and readability/maintainability.          o)  Refactor code for performance and readability/maintainability.
         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!  
126          o)  (Re)implement 128-bit loads/stores for R5900.          o)  (Re)implement 128-bit loads/stores for R5900.
127          o)  R4000 and others:          o)  R4000 and others:
128                  x)  watchhi/watchlo exceptions, and other exception                  x)  watchhi/watchlo exceptions, and other exception
129                      handling details                      handling details
130          o)  R10000 and others:  (R12000, R14000 ?)          o)  R10000 and others:  (R12000, R14000 ?)
131                    x)  The code before the line
132                            /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */
133                        in cpu_mips.c is not correct for R10000 according to
134                        Lemote's Godson patches for GXemul. TODO: Go through all
135                        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
136                        and make sure everything works with R10000.
137                        Then test with OpenBSD/sgi?
138                  x)  memory space, exceptions, ...                  x)  memory space, exceptions, ...
139                  x)  use cop0 framemask for tlb lookups                  x)  use cop0 framemask for tlb lookups
140                      (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)
141    
142  Dyntrans:  SuperH:
143          x)  Redesign/rethink the delay slot mechanism used for e.g. MIPS,          x)  SH4 interrupt controller:
144                  so that it caches a translation (that is, an instruction                  x)  Implement correct priorities of interrupts
145                  word and the instr_call it was translated to the last          x)  SH4 DMA (0xffa00000)
146                  time), so that it doesn't need to do slow          x)  SH4 UBC (0xff200000)
147                  to_be_translated for each end of page?          x)  Store queues can copy 32 bytes at a time, there's no need to
148          x)  Program Counter statistics:              copy individual 32-bit words. (Performance improvement.)
149                  Per machine? What about SMP? All data to the same file?          x)  SH4 BSC (Bus State Controller)
150                  A debugger command should be possible to use to enable/          x)  SH4 RTC: Read the host's clock.
151                  disable statistics gathering.          x)  SH4 SCIF: Serial _interrupts_
152                  Configuration file option!          x)  Instruction tracing should include symbols for branch targets,
153          x)  Common fatal_abort() function, which drops into the debugger              and so on, to make the output more human readable.
154                  without continuing.          x)  NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux?
155          x)  INVALIDATION should cause translations in _all_ cpus to be          x)  Replace pc-relative loads with immediate load, if within the
156              invalidated, e.g. on a write to a write-protected page              same page. (Similar to the same optimization for ARM.)
157              (containing code)          x)  Floating point speed!
158          x)  16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)          x)  Floating point exception correctness.
159          x)  Lots of other stuff: see src/cpus/README_DYNTRANS          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).
160          x)  true recompilation backend? think carefully about this,  
161              experiment in a separate project (not in GXemul)  Dreamcast:
162                  o) First test would be to just implement a simple          x)  G2 DMA
163                     instruction such as MIPS' addiu or lui, on AMD64          x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.
164                     hosts...          x)  PVR:  Lots of stuff. See dev_pvr.c.
165          x)  Idle loop detection? (Depends on target.) Could be turned          x)  GDROM
166              into usleep(1) or similar on the host... except when doing          x)  Modem
167              e.g. SMP emulation. Then it becomes trickier.          x)  PCI bridge/bus?
168            x)  Maple bus:
169                    x)  Correct controller input
170                    x)  Mouse input
171            x)  Software emulation of BIOS calls:
172                    x)  GD-ROM emulation: Use the GDROM device.
173                    x)  Use the VGA font as a fake ROM font. (Better than
174                        nothing.)
175            x)  Linux/dreamcast? (The gentoo kernel currently crashes.)
176            x)  Make as many as possible of the KOS examples run!
177            x)  More homebrew demos/games.
178            x)  SPU: Sound emulation (ARM cpu).
179            x)  VME processor emulation? "(Sanyo LC8670 "Potato")" according to
180                Wikipedia, LC86K87 according to Comstedt's page. See
181                http://www.maushammer.com/vmu.html for a good description of
182                the differences between LC86104C and the one used in the VME.
183    
184  Transputer:  Transputer:
185          x)  Implement support for Helios binaries.          x)  Implement support for Helios binaries.
# Line 151  Transputer: Line 187  Transputer:
187          x)  Figure out how to boot an entire Helios distribution.          x)  Figure out how to boot an entire Helios distribution.
188          x)  Implement all instructions. :)          x)  Implement all instructions. :)
189    
190    RCA1802/RCA1805, CHIP8:
191            x)  CHIP8 -> RCA180x conversion
192                    x)  Think about how to do dual-mode, variable-instr-length
193                        ISAs, and switch between modes.
194                    x)  1805 "extended" opcode -> trigger CHIP8 emulation?
195                            That is, all calls 0NNN could point to 0x68 opcodes,
196                            which, if running on a 1802 in CHIP8-emulation-mode,
197                            would be manually interpreted.
198                    x)  Better solution:
199                            CHIP8 calls to 00xx => handle at high level,
200                                  calls to 0xxx in general = call 180X machine code
201                                    (0000 = reboot?)
202            x)  1802 info: http://www.nyx.net/~lturner/public_html/Cosmac.html
203                and:  http://www.elf-emulation.com/1802.html
204            x)  1805 extended opcodes: Implement at least disassembly support!
205            x)  Keyboard input.
206            x)  Sound (beep only).
207            x)  Slow-down to correct speed? Wikipedia: "it was usually operated
208                at 3.58 MHz/2 to suit the requirements of the 1861 chip which
209                gave a speed of a little over 100,000 instructions per second"
210                (Note that _CHIP8_ emulation would then be even slower.)
211            x)  SCHIP48 (Super) emulation:
212                    Some more opcodes, 128x64 framebuffer, larger
213                    sprites and fonts.
214    
215  Alpha:  Alpha:
216          o)  Virtual memory (tlbs etc)          x)  OSF1 PALcode, Virtual memory support.
217          o)  Get {NetBSD,OpenBSD,Linux}/alpha booting. :)          x)  PALcode replacement! PAL1E etc opcodes...?
218            x)  Interrupt/exception/trap handling.
219            x)  Floating point exception correctness.
220            x)  More work on bootup memory and register contents.
221            x)  More Alpha machine types, so it could work with
222                OpenBSD, FreeBSD, and Linux too?
223    
224  SPARC:  SPARC:
225          o)  Load/stores to alternate address spaces!          o)  Implement Adress space identifiers; load/stores etc.
226          o)  Save/restore register windows etc!          o)  Save/restore register windows etc! Both v9 and pre-v9!
227          o)  Finish the subcc and addcc flag computation code.          o)  Finish the subcc and addcc flag computation code.
228          o)  Add more registers (floating point, control regs etc)          o)  Add more registers (floating point, control regs etc)
229            o)  Exception/trap handling.
230          o)  Disassemly of some more instructions?          o)  Disassemly of some more instructions?
231          o)  Are sll etc 32-bit sign-extending or zero-extending?          o)  Are sll etc 32-bit sign-extending or zero-extending?
232          o)  Finish the GDB register stuff.          o)  Finish the GDB register stuff.
233            x)  Floating point exception correctness.
234          o)  SPARC v8, v7 etc?          o)  SPARC v8, v7 etc?
235    
236  Debugger:  Debugger:
# Line 172  Debugger: Line 240  Debugger:
240          o)  Try to make the debugger more modular and, if possible, reentrant!          o)  Try to make the debugger more modular and, if possible, reentrant!
241          o)  Remove the emul command? (But show network info if showing          o)  Remove the emul command? (But show network info if showing
242                  machines?)                  machines?)
243          o)  Generalize the expression evaluator. (debugger_expr.c?)          o)  Evaluate expressions within []? That would allow stuff like
244                  settable variables      ("show nr of instructions on average")                  cpu[x] where x is an expression.
245                  emul[x]                 defaults to current emul          o)  Settings:
246                  machine[x]              defaults to current machine                  x)  Special handlers for Write!
247                  cpu[x]                  defaults to currently focused cpu                          +)  MIPS coproc regs
248                  registers               cpu arch dependent (#-prefix)                          +)  Alpha/MIPS/SPARC zero registers
249                  symbols                 @-prefix                          +)  x86 64/32/16-bit registers
250                  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?)  
                         o)  Warnings when exiting the emulator, if the  
                             settings have not been removed exactly in  
                             the same way as they were added? This would  
                             improve code cleanliness in the long term.  
                             (I.e. require a corresponding _destroy()  
                             function for all _new functions... machine_  
                             cpu_ etc.)  
   
                 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.  
251          o)  see src/debugger.c for more          o)  see src/debugger.c for more
252    
253  POWER/PowerPC:  POWER/PowerPC:
254            x)  Fix DECR timer speed, so it matches the host.
255            x)  NetBSD/prep 3.x triggers a possible bug in the emulator:
256                <wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)>
257                  <ata_get_xfer(0,0xd60cdd30,0,8,..)>
258                    <0x26c550(&ata_xfer_pool,2,0,8,..)>
259                    <0x35c71c(0x3f27000,0,52,8,..)>
260                  <ata_exec_xfer(0xd005e4c8,0x3f27000,0,13,..)>
261                    <atastart(0xd005e4c8,0x3f27000,0,13,..)>
262                      <__wdccommand_start(0xd005e4c8,0x3f27000,0,13,..)>
263                        <bsw1(&prep_isa_io_space_tag,0x800001f6,0,176,..)>
264                    [ wdc: write to SDH: 0xb0 (sectorsize 2, lba=1, drive 1, head 0) ]
265                        <wdcwait(0xd005e4c8,72,64,0xbb8,..)>
266                          <0x198120(0xd005e4c8,72,64,0xbb8,..)>
267                            <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
268                            <delay(100,0,0,0xbb8,..)>
269                Note: <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)>
270          x)  PPC optimizations; instr combs          x)  PPC optimizations; instr combs
271          x)  64-bit stuff: either Linux on G5, or perhaps some hobbyist          x)  64-bit stuff: either Linux on G5, or perhaps some hobbyist
272                  version of AIX? (if there exists such a thing)                  version of AIX? (if there exists such a thing)
         x)  find and fix the bug which causes NetBSD/macppc to fail after  
             an install!  
273          x)  macppc: adb controller; keyboard (for framebuffer mode)          x)  macppc: adb controller; keyboard (for framebuffer mode)
274          x)  make OpenBSD/macppc work (PCI controller stuff)          x)  make OpenBSD/macppc work (PCI controller stuff)
275            x)  Floating point exception correctness.
276            x)  Alignment exceptions.
277    
278    PReP:
279            Clock time! ("Bad battery blah blah")
280    
281  Algor:  Algor:
282          PCI interrupts... needed or stuff like the tlp NIC?          o)  Other models than the P5064?
283            o)  PCI interrupts... needed for stuff like the tlp NIC?
284    
285    BeBox:
286            o)  Interrupts. There seems to be a problem with WDC interrupts
287                "after a short while", although a few interrupts get through?
288            o)  Perhaps find a copy of BeOS and try it?
289    
290    HPCmips:
291            x)  Mouse/pad support! :)
292            x)  A NIC? (As a PCMCIA device?)
293    
294    AVR:
295            o)  Everything.
296    
297  ARM:  ARM:
298          o)  try to get netbsd/evbarm 3.x running (iq80321)          o)  See netwinder_reset() in NetBSD; the current "an internal error
299                occured" message after reboot/halt is too ugly.
300            o)  ARM "wait"-like instruction?
301            o)  try to get netbsd/evbarm 3.x or 4.x running (iq80321)
302          o)  make the xscale counter registers (ccnt) work          o)  make the xscale counter registers (ccnt) work
303          o)  make the ata controller usable for FreeBSD!          o)  make the ata controller usable for FreeBSD!
304          o)  zaurus for openbsd...          o)  Zaurus emulation, for e.g. OpenBSD/zaurus
305          o)  debian/cats crashes because of unimplemented coproc stuff.          o)  Debian/cats crashes because of unimplemented coproc stuff.
306              fix this?              fix this?
307    
308    Test machines:
309            o)  dev_fb block fill and copy
310            o)  dev_fb draw characters (from the built-in font)?
311            o)  dev_fb input device? mouse pointer coordinates and buttons
312                    (allow changes in these to cause interrupts as well?)
313            o)  Redefine the halt() function so that it stops "sometimes
314                soon", i.e. usage in demo code should be:
315                    for (;;) {
316                            halt();
317                    }
318    
319    Better CD Image file support:
320            x)  Support CD formats that contain more than 1 track, e.g.
321                CDI files (?). These can then contain a mixture of e.g. sound
322                and data tracks, and booting from an ISO filesystem path
323                would boot from [by default] the first data track.
324                (This would make sense for e.g. Dreamcast CD images, or
325                possibly other live-CD formats.)
326    
327    Networking:
328            x)  Fix performance problems caused by only allowing a
329                single TCP packet to be unacked.
330            x)  Don't hardcode offsets into packets!
331            x)  Test with lower than 100 max tcp/udp connections,
332                to make sure that reuse works!
333            x)  Make OpenBSD work better as a guest OS!
334            x)  DHCP? Debian doesn't actually send DHCP packets, even
335                    though it claims to? So it is hard to test.
336            x)  Multiple networks per emulation, and let different
337                NICs in machines connect to different networks.
338            x)  Support VDE (vde.sf.net)? Easiest/cleanest (before a
339                redesign of the network framework has been done) is
340                probably to connect it using the current (udp) solution.
341            x)  Allow SLIP connections, possibly PPP, in addition to
342                ethernet?
343    
344  Cache simulation:  Cache simulation:
345          o)  Command line flags for:          o)  Command line flags for:
346                  o)  CPU endianness?                  o)  CPU endianness?
# Line 242  Cache simulation: Line 357  Cache simulation:
357              is another option (easier to implement, but very very slow).              is another option (easier to implement, but very very slow).
358    
359  Documentation:  Documentation:
360          o)  machines, cpus, devices.          x)  Note about sandboxing/security:
361          o)  Automagic documentation generation:                  Not all emulated instructions fail in the way they would
362                    do on real hardware (e.g. a userspace program writing to
363                    a system register might work in GXemul, but it would
364                    fail on real hardware).  Sandbox = contain from the
365                    host OS. But the emulated programs will run "less
366                    securely".
367            x)  Try NetBSD/arc 4.x! (It seems to work with disk images!)
368            x)  NetBSD/pmax 4 install instructions: xterm instead of vt100!
369            x)  BETTER DEVICE EXAMPLES!
370                    o)  Move away from technical.html to somewhere new.
371                    o)  DEVICE_TICK
372                    o)  Implement example devices using interrupts, dyntrans
373                        memory access, etc.?
374            x)  Document the dyntrans core?
375            x)  Rewrite the section about experimental devices, after the
376                framebuffer acceleration has been implemented, and demos
377                written. (Symbolic names instead of numbers; example
378                use cases, etc. Mention demo files that use the various
379                features?)
380            x)  "a very simple linear framebuffer device (for graphics output)"
381                under "which machines does gxemul emulate" ==> better
382                description?
383            x)  Better description on how to set up a cross compiler?
384                Example for MIPS64.
385            o)  Automagic documentation generation?
386                    x)  machines, cpus, devices.
387                  x)  REMEMBER that several machines/devices can be in                  x)  REMEMBER that several machines/devices can be in
388                          the same source file!                          the same source file!
389          o)  Try to rewrite the install instructions for those machines          o)  Try to rewrite the install instructions for those machines
390              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
391              ffs partition using up all of the disk image.)              to use a raw ffs partition, using up all of the disk image.)
392    
393  More generic out_of_memory error reporting, and check everywhere!  More generic out_of_memory error reporting, and check everywhere!
394          Causes: OpenBSD has low default limits for normal users.          Causes: OpenBSD has low default limits for normal users.
# Line 258  More generic out_of_memory error reporti Line 398  More generic out_of_memory error reporti
398                  Unix systems usually allow processes to allocate virtual                  Unix systems usually allow processes to allocate virtual
399                  memory beyond the amount of RAM in the machine.)                  memory beyond the amount of RAM in the machine.)
400    
 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)  
   
401  The Device subsystem:  The Device subsystem:
402          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
403              minimum size, etc, or up to a max size)              minimum size, etc, or up to a max size); if there is a collision,
404                return false. It is up to the caller to handle this situation!
405            x)  NOTE: Translations must be invalidated, both for
406                registering new devices, and for moving existing ones.
407                cpu->invalidate translation caches, for all CPUs that
408                are connected to a specific memory.
409          x)  keep track of interrupts and busses? actually, allowing any device          x)  keep track of interrupts and busses? actually, allowing any device
410              to be a bus might be a nice idea.              to be a bus might be a nice idea.
411          x)  turn interrupt controllers into devices? :-)          x)  turn interrupt controllers into devices? :-)
412          x)  refactor various clocks/nvram/cmos into one device?          x)  refactor various clocks/nvram/cmos into one device?
413    
 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.)  
   
414  PCI:  PCI:
415          x)  last write was ffffffff ==> fix this, it should be used          x)  last write was ffffffff ==> fix this, it should be used
416              together with a mask to get the correct bits. also, not ALL              together with a mask to get the correct bits. also, not ALL
417              bits are size bits! (lowest 4 vs lowest 2?)              bits are size bits! (lowest 4 vs lowest 2?)
418          x)  add support for address fixups          x)  add support for address fixups
419          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  
420    
421  Busses:  Clocks and timers:
422          o)  Redesign the entire "mainbus" concept!          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
423          o)  Busses should be placed in a hierarchical tree!          x)  Test the 8253? Right now it doesn't seem to be used?
424          o)  Easily configurable interrupt routing in SMP systems.          x)  NetWinder timeofday is incorrect!
425          o)  Specific clock/bus speeds, cpu speeds etc.          x)  Cobalt TOD is incorrect!
426          o)  Synchronization over network? or at least in dyntrans within          x)  Go through all other machines, one by one, and fix them.
             one emulated machine  
         o)  dev->bus: TurboChannel, PCMCIA, ADB?  
427    
428  Config file parser:  Config file parser:
429          o)  Rewrite it from scratch!          o)  Rewrite it from scratch!
430          o)  Usage of any expression available through the debugger          o)  Usage of any expression available through the debugger
431            o)  Allow interrupt controllers to be added! and interrupts
432                to be used in more ways than before
433          o)  Support for running debugger commands (like the -c          o)  Support for running debugger commands (like the -c
434              command line option)              command line option)
435    
436  Floating point layer:  Floating point layer:
437          o)  make it common enough to be used by _all_ emulation modes          o)  make it common enough to be used by _all_ emulation modes
438          o)  implement more stuff          o)  implement correct error/exception handling and rounding modes
439            o)  implement more helper functions (i.e. add, sub, mul...)
440          o)  non-IEEE modes (i.e. x86)?          o)  non-IEEE modes (i.e. x86)?
441    
442  Userland emulation:  Userland emulation:
# Line 321  Userland emulation: Line 445  Userland emulation:
445    
446  Sound:  Sound:
447          x)  generic sound framework          x)  generic sound framework
448          x)  add one or more sound cards as devices          x)  add one or more sound cards as devices; add a testmachine
449                sound card first?
450            x)  Dreamcast sound? Generic PCI sound cards?
451    
452  ASC SCSI controller:  ASC SCSI controller:
453          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
454              cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem              cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem
455              in NetBSD itself, http://mail-index.netbsd.org/source-changes/              in NetBSD itself, http://mail-index.netbsd.org/source-changes/
456              2005/11/06/0024.html suggests that.)              2005/11/06/0024.html suggests that.)
457                NetBSD 4.x seems to work? :)
458    
459  Caches / memory hierarchies: (this is mostly MIPS-specific)  Caches / memory hierarchies: (this is mostly MIPS-specific)
460          o)  src/memory*.c: Implement correct cache emulation for          o)  src/memory*.c: Implement correct cache emulation for
# Line 346  Caches / memory hierarchies: (this is mo Line 473  Caches / memory hierarchies: (this is mo
473              possible.              possible.
474    
475  File/disk/symbol handling:  File/disk/symbol handling:
476            o)  Make sure that disks can be added/removed during runtime!
477                (Perhaps this needs a reasonably large re-write.)
478          o)  Remove some of the complexity in file format guessing, for          o)  Remove some of the complexity in file format guessing, for
479                  Ultrix kernels that are actually disk images?                  Ultrix kernels that are actually disk images?
480          o)  Better handling of tape files          o)  Better handling of tape files      
481          o)  Read function argument count and types from binaries? (ELF?)          o)  Read function argument count and types from binaries? (ELF?)
482          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.
483              Microsoft's C++, so multiple schemes must be possible. See              Microsoft's C++, so multiple schemes must be possible. See
# Line 357  File/disk/symbol handling: Line 486  File/disk/symbol handling:
486  Userland ABI emulation:  Userland ABI emulation:
487          o)  see src/useremul.c          o)  see src/useremul.c
488    
 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.))  
   
489  Better framebuffer and X-windows functionality:  Better framebuffer and X-windows functionality:
490            o)  Generalize the update_x1y1x2y2 stuff to an extend-region()
491                function...
492          o)  -Yx sometimes causes crashes.          o)  -Yx sometimes causes crashes.
493          o)  Simple device access to framebuffer_blockcopyfill() etc,          o)  Simple device access to framebuffer_blockcopyfill() etc,
494              and text output (using the built-in fonts), for dev_fb.              and text output (using the built-in fonts), for dev_fb.
# Line 378  Better framebuffer and X-windows functio Line 499  Better framebuffer and X-windows functio
499          o)  Non-resizable windows?  Or choose scaledown depending          o)  Non-resizable windows?  Or choose scaledown depending
500                  on size (and center the image, with a black border).                  on size (and center the image, with a black border).
501          o)  Different scaledown on different windows?          o)  Different scaledown on different windows?
502            o)  Non-integral scale-up? (E.g. 640x480 -> 1024x768)
503          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)          o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
504          o)  Bug reported by Elijah Rutschman on MacOS with weird          o)  Bug reported by Elijah Rutschman on MacOS with weird
505              keys (F5 = cursor down?).              keys (F5 = cursor down?).
# Line 391  Better framebuffer and X-windows functio Line 513  Better framebuffer and X-windows functio
513          o)  Generalize the framebuffer stuff by moving _ALL_ X11          o)  Generalize the framebuffer stuff by moving _ALL_ X11
514                  specific code to src/x11.c!                  specific code to src/x11.c!
515    
 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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