/[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!
ViewVC logotype

Diff of /trunk/TODO

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 37 by dpavlin, Mon Oct 8 16:21:34 2007 UTC revision 38 by dpavlin, Mon Oct 8 16:21:53 2007 UTC
# Line 1  Line 1 
1  $Id: TODO,v 1.464 2007/03/16 14:13:59 debug Exp $  $Id: TODO,v 1.476 2007/04/14 05:39:47 debug Exp $
2    
3  -------------------------------------------------------------------------------  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.)
 Landisk SH4:  
         HITTA OCH FIXA SH4-STABILITETSPROBLEMEN!  
         SH4 RTC, läs värdmaskinens klocka.  
         När NetBSD 4.0 och OpenBSD 4.1 kommit ut, uppdatera  
         installationsinstruktionerna i dokumentationen, flytta upp till  
         supportat OS (guestos & index).  
         Lägg till landisk i emulated machines i intro.html.  
         Sätt machine_landisk stable = 1, om/när allt funkar.  
   
 Add a special function to the testmachine devices, console perhaps?  
 which prints a zero-terminated string like "[[ %s ]]\n" when given  
 a virtual memory address (or a physical? or perhaps both should be possible).  
         o) NOT to the console, but to the emulator's controlling terminal.  
            DEBUG output, not console output!  
         o) Very useful for debugging. DOCUMENT it!  
   
 Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)  
   
 Prova att installera GNU Linux/DECstation _UTAN_  
 slow_serial_interrupts_hack_for_linux! Det kanske funkar med  
 nya interruptsystemet?  
   
 -------------------------------------------------------------------------------  
   
 Possible (relatively large) work packages to concentrate on in the future:  
   
   x)  SMP:  
         Get SMP working again. It is pretty much broken since I started  
         the conversion from the old bintrans system to the new dyntrans system.  
         Add better Test machine demos for SMP in the demos directory.  
         Either multiple dev_mp (one per cpu), or the single dev_mp must  
         _really_ keep all per-cpu values separate.  
   
   x)  Alpha and SPARC emulation:  
         These are the next two CPU/machine families that I want to emulate.  
   
   x)  Network:  
         Redesign of the networking subsystem, at least the NAT translation  
         part. The current way of allowing raw ethernet frames to be  
         transfered to/from the emulator via UDP should probably be extended  
         to allow the frames to be transmitted other ways as well.  
         Also adding support for connecting ttys (either to xterms, or to  
         pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-).  
         Documentation updates (!) are very important, making it easier to  
         use the (already existing) network emulation features.  
   
   x)  PCI:  
         Pretty much everything related to runtime configuration, device  
         slots, interrupts, whatever. The current code is very hardcoded  
         and ugly.  
         o) Allow cards to be added/removed during runtime more easily.  
         o) Allow cards to be enabled/disabled (i/o ports, etc, like  
            NetBSD needs for disk controller detection).  
         o) Allow devices to be moved in memory during runtime.  
         o) Interrupts per PCI slot, etc. (A-D).  
         o) PCI interrupt controller logic... very hard to get right,  
            because these differ a lot from one machine to the next.  
   
   x)  Debugging:  
         Think more about SMP debugging, etc. Right now, the  
         debugger is a mess. Also, a better connection to GDB would be  
         very nice to have.  
   
   x)  Userland emulation:  
         Primary goals would be NetBSD and Linux syscall emulation.  
   
   x)  Variable-length ISA support:  
         The support for emulation of variable length ISAs (such as  
         M68K, AMD64/i386, or AVR32) is not really there yet. It would  
         be very fun to work on this, to get it right.  
   
   x)  Native code generation backends.  
         Not necessary to have the emulator working, but speed is  
         always nice to have.  
   
   x)  Remove all "addr mult" device support!  
         Long term goal. Replace the current hacks with address  
         multiplication _per device_ with layered devices, so that the  
         end device (wdc, ns16550, whatever) only supports one access  
         style, and the layers in between convert to 16/32/64-bit  
         word alignment.  
   
 And of course, there are _LOTS_ of minor TODOs spread out throughout  
 the source code, which must be fixed sooner or later.  
   
 -------------------------------------------------------------------------------  
   
 Some other things, in random order, that I'd like to fix: (Some items in  
 this list are probably out-to-date by now.)  
5    
6  Dyntrans:  Dyntrans:
7          x)  Instruction combination collisions? How to avoid easily...          x)  Instruction combination collisions? How to avoid easily...
# Line 126  Dyntrans: Line 37  Dyntrans:
37              (containing code)              (containing code)
38          x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)          x)  16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64)
39          x)  Lots of other stuff: see src/cpus/README_DYNTRANS          x)  Lots of other stuff: see src/cpus/README_DYNTRANS
40          x)  true recompilation backend? think carefully about this.          x)  Native code generation backends:
41                  o)  abstract syntax for emitting opcopdes                  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                  o)  convert into native code only after an entire
47                          block has been translated? probably best.                          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                  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                  o)  branches to already translated code blocks can
57                          link the blocks together                          link the blocks together
58                  o)  load/store are the most important.                  o)  load/store are the most important to optimize
59    
60  Simple Valgrind-like checks?  Simple Valgrind-like checks?
61          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 193  MIPS: Line 115  MIPS:
115    
116  SuperH:  SuperH:
117          x)  SH4 interrupt controller:          x)  SH4 interrupt controller:
118                  x)  Implement correct priorities of interrupts                  x)  MASKING should be possible!
119          x)  SH4 DMA (0xffa00000)          x)  SH4 DMA (0xffa00000)
120          x)  SH4 UBC (0xff200000)          x)  SH4 UBC (0xff200000)
121            x)  SH4 timers are going too fast!
122          x)  Store queues can copy 32 bytes at a time, there's no need to          x)  Store queues can copy 32 bytes at a time, there's no need to
123              copy individual 32-bit words. (Performance improvement.)              copy individual 32-bit words. (Performance improvement.)
124          x)  SH4 BSC (Bus State Controller)          x)  SH4 BSC (Bus State Controller)
         x)  SH4 RTC: Read the host's clock.  
125          x)  Instruction tracing should include symbols for branch targets,          x)  Instruction tracing should include symbols for branch targets,
126              and so on, to make the output more human readable.              and so on, to make the output more human readable.
127          x)  NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux?          x)  SH3-specific devices: Pretty much everything!
128            x)  NetBSD/evbsh3, mmeye, hpcsh! Linux?
129          x)  Replace pc-relative loads with immediate load, if within the          x)  Replace pc-relative loads with immediate load, if within the
130              same page. (Similar to the same optimization for ARM.)              same page. (Similar to the same optimization for ARM.)
131          x)  Floating point speed!          x)  Floating point speed!
132          x)  Floating point exception correctness.          x)  Floating point exception correctness.
133          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).          x)  Think carefully about how to implement SH5/SH64 (for evbsh5).
134    
135    Landisk SH4:
136            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:  Dreamcast:
141          x)  G2 DMA          x)  G2 DMA
142          x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.          x)  LAN adapter (dev_mb8696x.c).  NetBSD root-on-nfs.
143          x)  PVR:  Lots of stuff. See dev_pvr.c.          x)  PVR:  Lots of stuff. See dev_pvr.c.
144          x)  GDROM          x)  Better GDROM support
145          x)  Modem          x)  Modem
146          x)  PCI bridge/bus?          x)  PCI bridge/bus?
147          x)  Maple bus:          x)  Maple bus:
# Line 223  Dreamcast: Line 151  Dreamcast:
151                  x)  GD-ROM emulation: Use the GDROM device.                  x)  GD-ROM emulation: Use the GDROM device.
152                  x)  Use the VGA font as a fake ROM font. (Better than                  x)  Use the VGA font as a fake ROM font. (Better than
153                      nothing.)                      nothing.)
         x)  Linux/dreamcast? (The gentoo kernel currently crashes.)  
154          x)  Make as many as possible of the KOS examples run!          x)  Make as many as possible of the KOS examples run!
155          x)  More homebrew demos/games.          x)  More homebrew demos/games.
156          x)  SPU: Sound emulation (ARM cpu).          x)  SPU: Sound emulation (ARM cpu).
# Line 232  Dreamcast: Line 159  Dreamcast:
159              http://www.maushammer.com/vmu.html for a good description of              http://www.maushammer.com/vmu.html for a good description of
160              the differences between LC86104C and the one used in the VME.              the differences between LC86104C and the one used in the VME.
161    
 Transputer:  
         x)  Implement support for Helios binaries.  
         x)  Stack and register contents at startup?  
         x)  Figure out how to boot an entire Helios distribution.  
         x)  Implement all instructions. :)  
   
 RCA1802/RCA1805, CHIP8:  
         x)  CHIP8 -> RCA180x conversion  
                 x)  Think about how to do dual-mode, variable-instr-length  
                     ISAs, and switch between modes.  
                 x)  1805 "extended" opcode -> trigger CHIP8 emulation?  
                         That is, all calls 0NNN could point to 0x68 opcodes,  
                         which, if running on a 1802 in CHIP8-emulation-mode,  
                         would be manually interpreted.  
                 x)  Better solution:  
                         CHIP8 calls to 00xx => handle at high level,  
                               calls to 0xxx in general = call 180X machine code  
                                 (0000 = reboot?)  
         x)  1802 info: http://www.nyx.net/~lturner/public_html/Cosmac.html  
             and:  http://www.elf-emulation.com/1802.html  
         x)  1805 extended opcodes: Implement at least disassembly support!  
         x)  Keyboard input.  
         x)  Sound (beep only).  
         x)  Slow-down to correct speed? Wikipedia: "it was usually operated  
             at 3.58 MHz/2 to suit the requirements of the 1861 chip which  
             gave a speed of a little over 100,000 instructions per second"  
             (Note that _CHIP8_ emulation would then be even slower.)  
         x)  SCHIP48 (Super) emulation:  
                 Some more opcodes, 128x64 framebuffer, larger  
                 sprites and fonts.  
   
162  Alpha:  Alpha:
163          x)  OSF1 PALcode, Virtual memory support.          x)  OSF1 PALcode, Virtual memory support.
164          x)  PALcode replacement! PAL1E etc opcodes...?          x)  PALcode replacement! PAL1E etc opcodes...?
# Line 272  Alpha: Line 168  Alpha:
168          x)  More Alpha machine types, so it could work with          x)  More Alpha machine types, so it could work with
169              OpenBSD, FreeBSD, and Linux too?              OpenBSD, FreeBSD, and Linux too?
170    
171  SPARC:  SPARC (both the ISA and the machines):
172          o)  Implement Adress space identifiers; load/stores etc.          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!          o)  Save/restore register windows etc! Both v9 and pre-v9!
175          o)  Finish the subcc and addcc flag computation code.          o)  Finish the subcc and addcc flag computation code.
176          o)  Add more registers (floating point, control regs etc)          o)  Add more registers (floating point, control regs etc)
         o)  Exception/trap handling.  
177          o)  Disassemly of some more instructions?          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 GDB register stuff.          o)  Floating point exception correctness.
         x)  Floating point exception correctness.  
180          o)  SPARC v8, v7 etc?          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 327  POWER/PowerPC: Line 223  POWER/PowerPC:
223          x)  Alignment exceptions.          x)  Alignment exceptions.
224    
225  PReP:  PReP:
226          Clock time! ("Bad battery blah blah")          x)  Clock time! ("Bad battery blah blah")
227    
228  Algor:  Algor:
229          o)  Other models than the P5064?          o)  Other models than the P5064?
# Line 379  Better CD Image file support: Line 275  Better CD Image file support:
275              possibly other live-CD formats.)              possibly other live-CD formats.)
276    
277  Networking:  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          x)  Fix performance problems caused by only allowing a
288              single TCP packet to be unacked.              single TCP packet to be unacked.
289          x)  Don't hardcode offsets into packets!          x)  Don't hardcode offsets into packets!
# Line 466  The Device subsystem: Line 371  The Device subsystem:
371          x)  refactor various clocks/nvram/cmos into one device?          x)  refactor various clocks/nvram/cmos into one device?
372    
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?)
# Line 473  PCI: Line 388  PCI:
388          x)  generalize the interrupt routing stuff (lines etc)          x)  generalize the interrupt routing stuff (lines etc)
389    
390  Clocks and timers:  Clocks and timers:
391            x)  Fix the PowerPC DECR interrupt speed! (MacPPC and PReP speed, etc.)
392          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!          x)  DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c!
393          x)  Test the 8253? Right now it doesn't seem to be used?          x)  Test the 8253? Right now it doesn't seem to be used?
394          x)  NetWinder timeofday is incorrect!          x)  NetWinder timeofday is incorrect!
# Line 494  Floating point layer: Line 410  Floating point layer:
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
Legend:
Removed from v.37  
changed lines
  Added in v.38
  ViewVC Help
Powered by ViewVC 1.1.26