/[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 10 by dpavlin, Mon Oct 8 16:18:27 2007 UTC revision 22 by dpavlin, Mon Oct 8 16:19:37 2007 UTC
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1  $Id: TODO,v 1.139 2005/06/23 06:55:43 debug Exp $  $Id: TODO,v 1.209 2006/02/18 21:03:09 debug Exp $
2    
3  Here's a short list of what I have left to do on GXemul. This file is a mess.  Hm. This file is in random order, and not all parts of it are up-to-date.
 Order is random. Don't trust it to be up-to-date.  
4    
5          Caches / memory hierarchies: (this is mostly MIPS-specific)  Algor:  PCI and ISA and LOCAL interrupts! --> wdc could start working
6                  o)  MIPS coproc.c: bits in config registers should reflect          Add interrupt controller in dev_algor.c.
7                      correct cache sizes for _all_ CPU types. (currently only  
8                      implemented for R4000, R1x000, and a few others)  Dyntrans:
9                  o)  src/memory*.c: Implement correct cache emulation for          TOP Priority:
10                      all CPU types. (currently only R2000/R3000 is implemented)                  x)  64-bit stuff: good generic virtual memory translation, and
11                      (per CPU, multiple levels should be possible,                      other structures. not all 64 bits need to be used
12                      associativity etc!)                      (e.g. Alpha)
13                  o)  R2000/R3000 isn't _100%_ correct, just almost correct :)                  x)  Delay slots!
14                  o)  Move the -S (fill mem with random) functionality into the                  x)  Old MIPS -> dyntrans!
15                      memory.c subsystem, not machine.c or wherever it is now          Other stuff:
16                  o)  ECC stuff, simulation of memory errors?  (Machine dependant)          x)  INVALIDATION should cause translations in _all_ cpus to be
17                  o)  More than 4GB of emulated RAM, when run on a 32-bit host?              invalidated, e.g. on a write to a write-protected page
18                      (using manual swap-out of blocks to disk, ugly)              (containing code)
19                  o)  A global command line option should be used to turn          x)  Think about sharing code between CPUs of the same
20                      cache emulation on or off. When off, caches should be              arch/bitlength/endianness (the translation caches).
21                      faked like they are right now. When on, caches and              (Eg. a little-endian R4000 and a little-endian R5000 could
22                      memory latencies should be emulated as correctly as              share code, but not an R3000 and an R4000.)
23                      possible.          x)  better (meaningful) instr call statistics
24            x)  Call/return hints?
25          Network layer:          x)  16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)
26                  o)  Multiple networks per emulation, and let different          x)  PPC optimizations; instr combs
27                      NICs in machines connect to different networks.          x)  Alpha
28                  o)  many other issues: see src/net.c          x)  SPARC
29            x)  PPC (64-bit stuff)
30          CPU emulation:          x)  Lots of other stuff: see src/cpus/README_DYNTRANS
31                  o)  Binary translation:          x)  true recompilation backend? think carefully about this,
32                          +)  use an Intermediate Representation!              experiment in a separate project (not in GXemul)
33                          +)  recursive translation?  
34                          +)  basic blocks instead of one-instruction? :)  More generic out_of_memory error reporting, and check everywhere!
35                          +)  on Alpha: don't assume pca56-like byte load/store?          Causes: OpenBSD has low default limits for normal users.
36                          +)  write backends for UltraSparc and MIPS                  Host is 32-bit? (32-bit hosts are limited to 4 GB or less
37                          +)  see src/bintrans.c for more info                  of userspace memory.)
38                  o)  Dynamic-but-not-binary translation?                  You are actually low on RAM. (As trivial as this might sound,
39                  o)  All the non-MIPS modes need a bit of work.                  Unix systems usually allow processes to allocate virtual
40                    memory beyond the amount of RAM in the machine.)
41          MIPS CPU emulation:  
42                  o)  Instructions:  Breakpoints: 32-bit vs 64-bit sign extension for MIPS, warnings, etc.
43                          o)  Regression tests (see tests/README for more info):          Use the debugger's symbolic name stuff. (which will have to be
44                                  o)  Floating point exception handling, and          extended soon to support stuff like  "2*x + symbol + y" etc. cool
45                                          add more instructions.          stuff)
46                                  o)  Finish the MIPS16 translator, and test it!  
47                                  o)  MIPS ISA I, II, III, IV  Sprite (guest OS for DECstation emulation)
48                                  o)  MIPS V (SIMD vector stuff?)          x)  Timing problems during bootup?
49                                  o)  MDMX  (MIPS Digital Media Extension)  
50                                  o)  MIPS 3D  The Device subsystem:
51                                  o)  MIPS MT (Multi-thread stuff) (What's this?)          x)  allow devices to be moved and/or changed in size (down to a
52                          o)  Warn about mis-used bit fields (ie bits that              minimum size, etc, or up to a max size)
53                              should be all zeroes, warn about if they are not)!          x)  keep track of interrupts and busses? actually, allowing any device
54                              Both for coprocessor registers and for instruction              to be a bus might be a nice idea
55                              opcodes.          x)  refactor various clocks/nvram/cmos into one device?
56                          o)  the special2 stuff is a mess right now  
57                          o)  warn and/or cause exceptions for unimplemented  ARM:
58                              instructions (depending on CPU type)          o)  add ID for "i80321 600MHz rev 2 (XScale core)"
59                  o)  R2000/R3000:          o)  make the ata controller usable for FreeBSD!
60                          x)  R3000 "tri-byte stores". (What's this?)          x)  zaurus for openbsd...
61                  o)  R4000 and others:  
62                          x)  watchhi/watchlo exceptions, and other exception  PCI:
63                              handling details          x)  add support for address fixups
64                  o)  R10000 and others:  (R12000, R14000 ?)          x)  generalize the interrupt routing stuff (lines etc). this should
65                          x)  memory space, exceptions, ...              be per machine? or per bus, that's better
66                          x)  use cop0 framemask for tlb lookups  
67                              (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)  MacPPC:
68                  o)  Implement load delays?  Warnings on interlocks.          x)  dev_zs / interrupts?
69                  o)  Implement all coprocessor 0 bits / functions.          x)  adb controller; keyboard
70                          x)  coproc 0 selectors! (R4000 ?)          x)  make OpenBSD/macppc work (PCI controller stuff)
71                  o)  R4300 (nintendo64, no mmu?), R5900 (playstation2, weird  
72                          TLB/cache? 128-bit GPRs, new instructions),  Network layer:
73                          4K (note: NOT R4000), 5K (note: NOT R5000),          o)  DHCP (for Debian and BSD installers :-)
74                          R6000 (ISA II), R8000          o)  increase performance
75                  o)  Multi-cpu stuff:          o)  don't rely on NetBSD-ish usage
76                          +)  SGI's NUMA architecture. Study          o)  Multiple networks per emulation, and let different
77                                  x)  Linux sources              NICs in machines connect to different networks.
78                                  x)  SGI's specs on NUMA address space          o)  many other issues: see src/net.c
79                          +)  Ultrix?  NetBSD doesn't do SMP on MIPS yet :-(  
80                          +)  Own experiments with ycx2.  Busses:
81            o)  Redesign the entire "mainbus" concept!
82          Emulation of specific machines and devices:          o)  Busses should be placed in a hierarchical tree!
83                  o)  Use same clock for all emulations and machines.          o)  Easily configurable interrupt routing in SMP systems.
84                  o)  Clean up the device stuff (registering of devices etc)          o)  Specific clock/bus speeds, cpu speeds etc.
85                  o)  Various SCSI and IDE controllers          o)  Synchronization over network? or at least in dyntrans within
86                  o)  PS/2-style keyboard controller (for several machines)              one emulated machine
87                  o)  Generic busses;          o)  dev->bus: TurboChannel, PCMCIA, ADB?
88                          x)  PCI:  i/o and interrupts  
89                          x)  QBus-22 (DECsystem 5500, 5400?)  Config file parser:
90                  o)  DECstations (pmax):          o)  Refresh/rewrite it :)
91                          x)  ioasic          o)  Usage of any expression available through the debugger
92                          x)  framebuffers:          o)  Expressions such as "add device" would be nice to be able
93                                  +)  better cursor support, overlays?,              to do on the command line manually.
94                                  +)  2D/3D acceleration, PX[G]          o)  Allow machine() entries even if there is no emul() entry (but
95                          x)  status words / control words, make this more              then don't allow any emul() entries at all).
96                                  portable/cleaner          o)  Support for running debugger commands (like the -c
97                          x)  scsi controller(s): sii, DMA for asc              command line option)
98                          x)  serial controllers: ssc, scc (and more work on dc?)  
99                          x)  nvram on decstation 5000/125:  when using X11,  Floating point layer:
100                                  set console=g or similar          o)  make it common enough to be used by _all_ emulation modes
101                          x)  DECstation 5840? "xbi-based SMP"          o)  non-IEEE modes (i.e. x86)?
102                  o)  SGI and ARC machines (sgimips, arc):  
103                          x)  IP32 ("O2"): (Lots of stuff)  Userland emulation:
104                                  +)  mec (ethernet)          x)  Lots of stuff; freebsd and netbsd (and linux?) syscalls.
105                                  +)  pci          x)  Dynamic linking? Hm.
106                                  +)  ahc (scsi)  
107                                  +)  ps2 kbd  Sound:
108                                  +)  memory controller          x)  generic sound framework
109                                  +)  framebuffer/graphics          x)  add one or more sound cards as devices
110                                  +)  caches  
111                          x)  more ARCBIOS stuff  Caches / memory hierarchies: (this is mostly MIPS-specific)
112                          x)  Memory/interrupt controllers          o)  MIPS coproc.c: bits in config registers should reflect
113                          x)  IP30 (Linux with graphics support?)              correct cache sizes for _all_ CPU types. (currently only
114                          x)  SMP / NUMA?  (SGI and various ARC machines)              implemented for R4000, R1x000, and a few others)
115                  o)  Playstation 2:          o)  src/memory*.c: Implement correct cache emulation for
116                          Hardware:  OHCI usb controller, keyboard, ...              all CPU types. (currently only R2000/R3000 is implemented)
117                  o)  Less interesting platforms:              (per CPU, multiple levels should be possible,
118                          o)  newsmips:              associativity etc!)
119                                  o)  NetBSD/newsmips, get it to detect a "real"          o)  R2000/R3000 isn't _100%_ correct, just almost correct :)
120                                      model, right now everything is 100% bogus          o)  Move the -S (fill mem with random) functionality into the
121                          o)  mipsco? (NetBSD)              memory.c subsystem, not machine.c or wherever it is now
122                          o)  wgrisc? (big endian R3000, in OpenBSD's attic)          o)  ECC stuff, simulation of memory errors?  (Machine dependent)
123                          o)  other embedded / evaluation MIPS boards          o)  More than 4GB of emulated RAM, when run on a 32-bit host?
124                          o)  Playstation 1? R3000A. Weird hardware?              (using manual swap-out of blocks to disk, ugly)
125                                  No FPU, but something as coproc 2.          o)  A global command line option should be used to turn
126                          o)  Nintendo 64, http://www.nintendo.com/systems/n64/n64_specs.jsp              cache emulation on or off. When off, caches should be
127                                  (R4300, 4MB RAM, really weird memory map)              faked like they are right now. When on, caches and
128                memory latencies should be emulated as correctly as
129          File/disk handling:              possible.
130                  o)  Read function argument count and types from binaries? (ELF?)  
131                  o)  Better handling of tape files  MIPS CPU emulation:  (note: this is for the OLD mips stuff)
132            o)  i386 bintrans backend: movn etc, slt[u] for
133          Userland ABI emulation:                  64-bit mode, 64-bit shifts etc
134                  o)  see src/useremul.c          o)  Instructions:
135                    o)  All ISAs:
136          Terminal based interactive debugger:                          o)  Floating point exception handling, and
137                  o)  see src/debugger.c                                  add more instructions.
138                            o)  Finish the MIPS16 translator, and test it!
139          Terminal/console stuff:                          o)  MIPS ISA I, II, III, IV
140                  o)  allow emulated serial ports to be connected to the outside                          o)  MIPS V (SIMD vector stuff?)
141                      world in a more generic way, or even to other emulated                          o)  MDMX  (MIPS Digital Media Extension)
142                      machines(!)                          o)  MIPS 3D
143                            o)  MIPS MT (Multi-thread stuff) (What's this?)
144          Regression tests:  (Should be totally rewritten.)                  o)  Warn about mis-used bit fields (ie bits that
145                  o)  see tests/                      should be all zeroes, warn about if they are not)!
146                        Both for coprocessor registers and for instruction
147          Save state of the whole emulated machine, to be able to load it back                      opcodes.
148                  in later?  (Memory, all device's states, all registers and                  o)  the special2 stuff is a mess right now
149                  so on.  Like taking a snapshot. (SimOS seems to do this,                  o)  warn and/or cause exceptions for unimplemented
150                  according to its website.))                      instructions (depending on CPU type)
151            o)  R2000/R3000:
152          Better X-windows functionality:                  x)  R3000 "tri-byte stores". (What's this?)
153                  o)  CLEAN UP the ugly event code          o)  R4000 and others:
154                  o)  Mouse clicks can be "missed" in the current system; this is                  x)  watchhi/watchlo exceptions, and other exception
155                      not good. They should be put on a stack of some kind.                      handling details
156                  o)  More 2D and 3D framebuffer acceleration.          o)  R10000 and others:  (R12000, R14000 ?)
157                  o)  Non-resizable windows?  Or choose scaledown depending                  x)  memory space, exceptions, ...
158                          on size (and center the image, with a black border).                  x)  use cop0 framemask for tlb lookups
159                  o)  Different scaledown on different windows?                      (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)
160                  o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)          o)  Implement load delays?  Warnings on interlocks.
161                  o)  Keyboard and mouse events:          o)  Implement all coprocessor 0 bits / functions.
162                          x)  Do this for more machines than just DECstation                  x)  coproc 0 selectors! (R4000 ?)
163                          x)  more X11 cursor keycodes          o)  R4300 (nintendo64, no mmu?), R5900 (playstation2, weird
164                          x)  Keys like CTRL, ALT, SHIFT do not get through                  TLB/cache? 128-bit GPRs, new instructions),
165                              by themselves (these are necessary for example                  4K (note: NOT R4000), 5K (note: NOT R5000),
166                              to change the font of an xterm in X in the                  R6000 (ISA II), R8000
167                              emulator)          o)  Multi-cpu stuff:
168                  o)  Generalize the framebuffer stuff by moving _ALL_ X11                  +)  Interrupt routing (ie devices vs mainbus, or
169                          specific code to src/x11.c!                      connect each device to a fixed cpu)
170                    +)  SGI's NUMA architecture. Study
171          Statistics:  (this could be interesting)                          x)  Linux sources
172                  o)  Save to file and show graphics. It should be possible to                          x)  SGI's specs on NUMA address space
173                      run gxemul after a simulation to just show the graphics,                  +)  Ultrix?  NetBSD doesn't do SMP on MIPS yet :-(
174                      or convert to a .ppm or .tga or similar.                  +)  Own experiments with ycx2.
175                  o)  memory accesses (to measure cache efficiency and  
176                          page coloring efficiency)  File/disk/symbol handling:
177                  o)  nr of simultaneous ASIDs in use in the TLB, for MIPS          o)  Better handling of tape files
178                  o)  percentage of time spent in different "states", such as          o)  Read function argument count and types from binaries? (ELF?)
179                      running userland code, kernel code, or idling (for CPUs          o)  Demangle C++ names.
180                      that have such an instruction, or whenever the PC is  
181                      inside a specific idle-function (address range)).  Debugger:
182                      Possible additional state (for example on R3000): caches          o)  see src/debugger.c for more
183                      disabled.  
184                  o)  position of read/write on (SCSI) disks  Userland ABI emulation:
185            o)  see src/useremul.c
186    
187    Terminal/console:
188            o)  allow emulated serial ports to be connected to the outside
189                world in a more generic way, or even to other emulated
190                machines(?)
191    
192    Save state of the whole emulated machine, to be able to load it back
193            in later?  (Memory, all device's states, all registers and
194            so on.  Like taking a snapshot. (SimOS seems to do this,
195            according to its website.))
196    
197    Better framebuffer and X-windows functionality:
198            o)  -Yx sometimes causes crashes.
199            o)  Simple device access to framebuffer_blockcopyfill() etc,
200                and text output (using the built-in fonts), for dev_fb.
201            o)  CLEAN UP the ugly event code
202            o)  Mouse clicks can be "missed" in the current system; this is
203                not good. They should be put on a stack of some kind.
204            o)  More 2D and 3D framebuffer acceleration.
205            o)  Non-resizable windows?  Or choose scaledown depending
206                    on size (and center the image, with a black border).
207            o)  Different scaledown on different windows?
208            o)  Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
209            o)  Keyboard and mouse events:
210                    x)  Do this for more machines than just DECstation
211                    x)  more X11 cursor keycodes
212                    x)  Keys like CTRL, ALT, SHIFT do not get through
213                        by themselves (these are necessary for example
214                        to change the font of an xterm in X in the
215                        emulator)
216            o)  Generalize the framebuffer stuff by moving _ALL_ X11
217                    specific code to src/x11.c!
218    
219    Statistics:  (this could be interesting)
220            o)  Save to file and show graphics. It should be possible to
221                run gxemul after a simulation to just show the graphics,
222                or convert to a .ppm or .tga or similar.
223            o)  memory accesses (to measure cache efficiency and
224                    page coloring efficiency)
225            o)  nr of simultaneous ASIDs in use in the TLB, for MIPS
226            o)  percentage of time spent in different "states", such as
227                running userland code, kernel code, or idling (for CPUs
228                that have such an instruction, or whenever the PC is
229                inside a specific idle-function (address range)).
230                Possible additional state (for example on R3000): caches
231                disabled.
232            o)  position of read/write on (SCSI) disks
233    

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