1 |
$Id: TODO,v 1.125 2005/03/06 08:21:10 debug Exp $ |
$Id: TODO,v 1.453 2007/02/19 01:34:42 debug Exp $ |
2 |
|
|
3 |
Here's a short list of what I have left to do on GXemul. This file is a mess. |
------------------------------------------------------------------------------- |
|
Order is random. Don't trust it to be up-to-date. |
|
4 |
|
|
5 |
|
Fix after the 0.4.4 release: |
6 |
|
Fix the PowerPC DECR interrupt speed! |
7 |
|
|
8 |
Caches / memory hierarchies: (this is mostly MIPS-specific) |
------------------------------------------------------------------------------- |
9 |
o) MIPS coproc.c: bits in config registers should reflect |
|
10 |
correct cache sizes for _all_ CPU types. (currently only |
Possible (relatively large) work packages to concentrate on in the future: |
11 |
implemented for R4000, R1x000, and a few others) |
|
12 |
o) src/memory*.c: Implement correct cache emulation for |
x) SMP: |
13 |
all CPU types. (currently only R2000/R3000 is implemented) |
Get SMP working again. It is pretty much broken since I started |
14 |
(per CPU, multiple levels should be possible, |
the conversion from the old bintrans system to the new dyntrans system. |
15 |
associativity etc!) |
Add better Test machine demos for SMP in the demos directory. |
16 |
o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
|
17 |
o) Move the -S (fill mem with random) functionality into the |
x) Network: |
18 |
memory.c subsystem, not machine.c or wherever it is now |
Redesign of the networking subsystem, at least the NAT translation |
19 |
o) ECC stuff, simulation of memory errors? (Machine dependant) |
part. The current way of allowing raw ethernet frames to be |
20 |
o) More than 4GB of emulated RAM, when run on a 32-bit host? |
transfered to/from the emulator via UDP should probably be extended |
21 |
(using manual swap-out of blocks to disk, ugly) |
to allow the frames to be transmitted other ways as well. |
22 |
o) A global command line option should be used to turn |
Also adding support for connecting ttys (either to xterms, or to |
23 |
cache emulation on or off. When off, caches should be |
pipes/sockets etc, or even to PPP->NAT or SLIP->NAT :-). |
24 |
faked like they are right now. When on, caches and |
|
25 |
memory latencies should be emulated as correctly as |
x) PCI: |
26 |
possible. |
Pretty much everything related to runtime configuration, device |
27 |
|
slots, interrupts, whatever. The current code is very hardcoded |
28 |
Network layer: |
and ugly. |
29 |
o) Multiple networks per emulation, and let different |
|
30 |
NICs in machines connect to different networks. |
x) Debugging: |
31 |
o) Network across multiple hosts. |
Think more about SMP debugging, etc. Right now, the |
32 |
o) Fixed MAC addresses for NICs, fixed IPv4 addresses if |
debugger is a mess. Also, a better connection to GDB would be |
33 |
DHCP or RARP is used. |
very nice to have. |
34 |
o) many other issues: see src/net.c |
|
35 |
|
x) Userland emulation: |
36 |
Configure script: |
Primary goals would be NetBSD and Linux syscall emulation. |
37 |
o) Only enable Alpha prefetch on pca56 etc, not on ev4, ev5. |
|
38 |
o) Use getopts? |
And of course, there are _LOTS_ of minor TODOs spread out throughout |
39 |
o) X11 libs and headers via command line option? |
the source code, which must be fixed sooner or later. |
40 |
o) Verify that the configure script, building and running |
|
41 |
the emulator works on some platforms: |
------------------------------------------------------------------------------- |
42 |
+) Irix, AIX, QNX |
|
43 |
+) MacOS X (I've not tried this personally yet) |
Some other things, in random order, that I'd like to fix: (Some items in |
44 |
+) Ultrix using gcc? (Inside the emulator) |
this list are probably out-to-date by now.) |
45 |
|
|
46 |
CPU emulation: |
Dyntrans: |
47 |
o) Binary translation: |
x) Instruction combination collisions? How to avoid easily... |
48 |
+) use an Intermediate Representation! |
x) Think about how to do both SHmedia and SHcompact in a reasonable |
49 |
+) recursive translation? |
way! (Or AMD64 long/protected/real, for that matter.) |
50 |
+) basic blocks instead of one-instruction? :) |
x) 68K emulation; think about how to do variable instruction |
51 |
+) on Alpha: don't assume pca56-like byte load/store? |
lengths across page boundaries. |
52 |
+) write backends for UltraSparc and MIPS |
x) Dyntrans with valgrind-inspired memory checker. (In memory_rw, |
53 |
+) see src/bintrans.c for more info |
it would be reasonably simple to add; in each individual fast |
54 |
|
load/store routine = a lot more work, and it would become |
55 |
MIPS CPU emulation: |
kludgy very fast.) |
56 |
o) Instructions: |
x) Dyntrans with SMP... lots of work to be done here. |
57 |
o) Regression tests (see tests/README for more info): |
x) Dyntrans with cache emulation... lots of work here as well. |
58 |
o) Floating point exception handling, and |
o) dev_mp doesn't work well with dyntrans yet |
59 |
add more instructions. |
o) In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans |
60 |
o) Finish the MIPS16 translator, and test it! |
x) Redesign/rethink the delay slot mechanism used for e.g. MIPS, |
61 |
o) MIPS ISA I, II, III, IV |
so that it caches a translation (that is, an instruction |
62 |
o) MIPS V (SIMD vector stuff?) |
word and the instr_call it was translated to the last |
63 |
o) MDMX (MIPS Digital Media Extension) |
time), so that it doesn't need to do slow |
64 |
o) MIPS 3D |
to_be_translated for each end of page? |
65 |
o) MIPS MT (Multi-thread stuff) (What's this?) |
x) Program Counter statistics: |
66 |
o) Warn about mis-used bit fields (ie bits that |
Per machine? What about SMP? All data to the same file? |
67 |
should be all zeroes, warn about if they are not)! |
A debugger command should be possible to use to enable/ |
68 |
Both for coprocessor registers and for instruction |
disable statistics gathering. |
69 |
opcodes. |
Configuration file option! |
70 |
o) the special2 stuff is a mess right now |
x) Breakpoints: |
71 |
o) warn and/or cause exceptions for unimplemented |
o) Physical vs virtual addresses! |
72 |
instructions (depending on CPU type) |
o) 32-bit vs 64-bit sign extension for MIPS, and others? |
73 |
o) R2000/R3000: |
x) INVALIDATION should cause translations in _all_ cpus to be |
74 |
x) R3000 "tri-byte stores". (What's this?) |
invalidated, e.g. on a write to a write-protected page |
75 |
o) R4000 and others: |
(containing code) |
76 |
x) watchhi/watchlo exceptions, and other exception |
x) 16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64) |
77 |
handling details |
x) Lots of other stuff: see src/cpus/README_DYNTRANS |
78 |
o) R10000 and others: (R12000, R14000 ?) |
x) true recompilation backend? think carefully about this. |
79 |
x) memory space, exceptions, ... |
o) abstract syntax for emitting opcopdes |
80 |
x) use cop0 framemask for tlb lookups |
o) convert into native code only after an entire |
81 |
(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) |
block has been translated? probably best. |
82 |
o) Implement load delays? Warnings on interlocks. |
o) x86/amd64 code generator can be very similar... perhaps |
83 |
o) Implement all coprocessor 0 bits / functions. |
o) branches to already translated code blocks can |
84 |
x) coproc 0 selectors! (R4000 ?) |
link the blocks together |
85 |
o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird |
o) load/store are the most important. |
86 |
TLB/cache? 128-bit GPRs, new instructions), |
|
87 |
4K (note: NOT R4000), 5K (note: NOT R5000), |
Simple Valgrind-like checks? |
88 |
R6000 (ISA II), R8000 |
o) Mark every address with bits which tell whether or not the address |
89 |
o) Multi-cpu stuff: |
has been written to. |
90 |
+) SGI's NUMA architecture. Study |
o) What should happen when programs are loaded? Text/data, bss (zero |
91 |
x) Linux sources |
filled). But stack space and heap is uninitialized. |
92 |
x) SGI's specs on NUMA address space |
o) Uninitialized local variables: |
93 |
+) Ultrix? NetBSD doesn't do SMP on MIPS yet :-( |
A load from a place on the stack which has not previously |
94 |
+) Own experiments with ycx2. |
been stored to => warning. Increasing the stack pointer using |
95 |
|
any available means should reset the memory to uninitialized. |
96 |
Emulation of specific machines and devices: |
o) If calls to malloc() and free() can be intercepted: |
97 |
o) Clean up stuff to make it possible to emulate multiple |
o) Access to a memory area after free() => warning. |
98 |
(different) machines simultaneously. |
o) Memory returned by malloc() is marked as not-initialized. |
99 |
o) Use same clock for all emulations and machines. |
o) Non-passive, but good to have: Change the argument |
100 |
o) Clean up the device stuff (registering of devices etc) |
given to malloc, to return a slightly larger memory |
101 |
o) Various SCSI and IDE controllers |
area, i.e. margin_before + size + margin_after, |
102 |
o) PS/2-style keyboard controller (for several machines) |
and return the pointer + margin_before. |
103 |
o) Generic busses; |
Any access to the margin_before or _after space results |
104 |
x) PCI: i/o and interrupts |
in warnings. (free() must be modified to free the |
105 |
x) QBus-22 (DECsystem 5500, 5400?) |
actually allocated address.) |
106 |
o) DECstations (pmax): |
|
107 |
x) ioasic |
MIPS: |
108 |
x) framebuffers: |
o) Nicer MIPS status bits in register dumps. |
109 |
+) better cursor support, overlays?, |
o) Alignment exceptions. |
110 |
+) 2D/3D acceleration, PX[G] |
o) Floating point exception correctness. |
111 |
x) status words / control words, make this more |
o) Fix this? Triggered by NetBSD/sgimips? Hm: |
112 |
portable/cleaner |
to_be_translated(): TODO: unimplemented instruction: |
113 |
x) scsi controller(s): sii, DMA for asc |
000000000065102c: 00200800 (d) rot_00 at,zr,0 |
114 |
x) serial controllers: ssc, scc (and more work on dc?) |
o) Some more work on opcodes. |
115 |
x) nvram on decstation 5000/125: when using X11, |
x) MIPS64 revision 2. |
116 |
set console=g or similar |
o) Find out which actual CPUs implement the rev2 ISA! |
117 |
x) DECstation 5840? "xbi-based SMP" |
o) DROTR32 and similar MIPS64 rev 2 instructions, |
118 |
o) SGI and ARC machines (sgimips, arc): |
which have a rotation bit which differs from |
119 |
x) IP32 ("O2"): (Lots of stuff) |
previous ISAs. |
120 |
+) mec (ethernet) |
o) EI and DI instructions for MIPS64/32 rev 2. |
121 |
+) pci |
NOTE: These are _NOT_ the same as for R5900! |
122 |
+) ahc (scsi) |
x) _MAYBE_ TX79 and R5900 actually differ in their |
123 |
+) ps2 kbd |
opcodes? Check this carefully! |
124 |
+) memory controller |
o) Dyntrans: Count register updates are probably not 100% correct yet. |
125 |
+) framebuffer/graphics |
o) Refactor code for performance and readability/maintainability. |
126 |
+) caches |
o) (Re)implement 128-bit loads/stores for R5900. |
127 |
x) more ARCBIOS stuff |
o) R4000 and others: |
128 |
x) Memory/interrupt controllers |
x) watchhi/watchlo exceptions, and other exception |
129 |
x) IP30 (Linux with graphics support?) |
handling details |
130 |
x) SMP / NUMA? (SGI and various ARC machines) |
o) R10000 and others: (R12000, R14000 ?) |
131 |
o) Cobalt: PCI and interrupt system, ethernet, |
x) The code before the line |
132 |
harddisk controller(s) |
/* reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK; */ |
133 |
o) Playstation 2: |
in cpu_mips.c is not correct for R10000 according to |
134 |
Hardware: OHCI usb controller, keyboard, IDE, ... |
Lemote's Godson patches for GXemul. TODO: Go through all |
135 |
Has an R3000A as a subsystem (!) |
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 |
o) hpcmips: framebuffer(s) and harddisk controller, |
and make sure everything works with R10000. |
137 |
among other things |
Then test with OpenBSD/sgi? |
138 |
o) newsmips: |
x) memory space, exceptions, ... |
139 |
o) NetBSD/newsmips, get it to detect a "real" |
x) use cop0 framemask for tlb lookups |
140 |
model, right now everything is 100% bogus |
(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 |
o) Less interesting platforms: |
|
142 |
o) mipsco? (NetBSD) |
SuperH: |
143 |
o) wgrisc? (big endian R3000, in OpenBSD's attic) |
x) SH4 interrupt controller: |
144 |
o) other embedded / evaluation MIPS boards |
x) Implement correct priorities of interrupts |
145 |
o) Playstation 1? R3000A. Weird hardware? |
x) SH4 DMA (0xffa00000) |
146 |
No FPU, but something as coproc 2. |
x) SH4 UBC (0xff200000) |
147 |
o) Nintendo 64, http://www.nintendo.com/systems/n64/n64_specs.jsp |
x) Store queues can copy 32 bytes at a time, there's no need to |
148 |
(R4300, 4MB RAM, really weird memory map) |
copy individual 32-bit words. (Performance improvement.) |
149 |
|
x) SH4 BSC (Bus State Controller) |
150 |
File/disk handling: |
x) SH4 RTC: Read the host's clock. |
151 |
o) Read function argument count and types from binaries? (ELF?) |
x) SH4 SCIF: Serial _interrupts_ |
152 |
o) ELF: separate LE/BE (MIPS instruction format) from LSB/MSB |
x) Instruction tracing should include symbols for branch targets, |
153 |
(ELF structure format)? |
and so on, to make the output more human readable. |
154 |
o) Better handling of tape files |
x) NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux? |
155 |
|
x) Replace pc-relative loads with immediate load, if within the |
156 |
Userland ABI emulation: |
same page. (Similar to the same optimization for ARM.) |
157 |
o) see src/useremul.c |
x) Floating point speed! |
158 |
|
x) Floating point exception correctness. |
159 |
Terminal based interactive debugger: |
x) Think carefully about how to implement SH5/SH64 (for evbsh5). |
160 |
o) see src/debugger.c |
|
161 |
|
Dreamcast: |
162 |
GDB interface? (Maybe not necessary; the built-in debugger feels |
x) G2 DMA |
163 |
more useful.) |
x) LAN adapter (dev_mb8696x.c). NetBSD root-on-nfs. |
164 |
|
x) PVR: Lots of stuff. See dev_pvr.c. |
165 |
GUI, interactive debugger? GTK+? (The GUI _must be optional_!) |
x) GDROM |
166 |
o) Breakpoints (complex expressions? combinations of register |
x) Modem |
167 |
states, memory accesses and so on) |
x) PCI bridge/bus? |
168 |
o) Instruction trace |
x) Maple bus: |
169 |
o) Disassembly of RAM (_NOT_ the same as instruction trace) |
x) Correct controller input |
170 |
o) Function call trace |
x) Mouse input |
171 |
o) Inspection of CPU registers/state, coprocessor |
x) Software emulation of BIOS calls: |
172 |
registers/state, any device registers/state/contents |
x) GD-ROM emulation: Use the GDROM device. |
173 |
o) Framebuffers in windows / tabs. |
x) Use the VGA font as a fake ROM font. (Better than |
174 |
o) Contents of RAM |
nothing.) |
175 |
o) "Start new emulation" should allow amount of |
x) Linux/dreamcast? (The gentoo kernel currently crashes.) |
176 |
RAM and nr of cpus to easily be specified. |
x) Make as many as possible of the KOS examples run! |
177 |
Multiple simultaneous machines should be possible. |
x) More homebrew demos/games. |
178 |
o) Disk images. |
x) SPU: Sound emulation (ARM cpu). |
179 |
|
x) VME processor emulation? "(Sanyo LC8670 "Potato")" according to |
180 |
Regression tests: |
Wikipedia, LC86K87 according to Comstedt's page. See |
181 |
o) see tests/ |
http://www.maushammer.com/vmu.html for a good description of |
182 |
|
the differences between LC86104C and the one used in the VME. |
183 |
Save state of the whole emulated machine, to be able to load it back |
|
184 |
in later? (Memory, all device's states, all registers and |
Transputer: |
185 |
so on. Like taking a snapshot. (SimOS seems to do this, |
x) Implement support for Helios binaries. |
186 |
according to its website.)) |
x) Stack and register contents at startup? |
187 |
|
x) Figure out how to boot an entire Helios distribution. |
188 |
Better X-windows functionality: |
x) Implement all instructions. :) |
189 |
o) CLEAN UP the ugly event code |
|
190 |
o) Mouse clicks can be "missed" in the current system; this is |
RCA1802/RCA1805, CHIP8: |
191 |
not good. They should be put on a stack of some kind. |
x) CHIP8 -> RCA180x conversion |
192 |
o) More 2D and 3D framebuffer acceleration. |
x) Think about how to do dual-mode, variable-instr-length |
193 |
o) Non-resizable windows? Or choose scaledown depending |
ISAs, and switch between modes. |
194 |
on size (and center the image, with a black border). |
x) 1805 "extended" opcode -> trigger CHIP8 emulation? |
195 |
o) Different scaledown on different windows? |
That is, all calls 0NNN could point to 0x68 opcodes, |
196 |
o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
which, if running on a 1802 in CHIP8-emulation-mode, |
197 |
o) Keyboard and mouse events: |
would be manually interpreted. |
198 |
x) Do this for more machines than just DECstation |
x) Better solution: |
199 |
x) more X11 cursor keycodes |
CHIP8 calls to 00xx => handle at high level, |
200 |
x) Keys like CTRL, ALT, SHIFT do not get through |
calls to 0xxx in general = call 180X machine code |
201 |
by themselves (these are necessary for example |
(0000 = reboot?) |
202 |
to change the font of an xterm in X in the |
x) 1802 info: http://www.nyx.net/~lturner/public_html/Cosmac.html |
203 |
emulator) |
and: http://www.elf-emulation.com/1802.html |
204 |
o) Generalize the framebuffer stuff by moving _ALL_ X11 |
x) 1805 extended opcodes: Implement at least disassembly support! |
205 |
specific code to src/x11.c! |
x) Keyboard input. |
206 |
|
x) Sound (beep only). |
207 |
Statistics: (this could be interesting) |
x) Slow-down to correct speed? Wikipedia: "it was usually operated |
208 |
o) Save to file and show graphics. It should be possible to |
at 3.58 MHz/2 to suit the requirements of the 1861 chip which |
209 |
run gxemul after a simulation to just show the graphics, |
gave a speed of a little over 100,000 instructions per second" |
210 |
or convert to a .ppm or .tga or similar. |
(Note that _CHIP8_ emulation would then be even slower.) |
211 |
o) memory accesses (to measure cache efficiency and |
x) SCHIP48 (Super) emulation: |
212 |
page coloring efficiency) |
Some more opcodes, 128x64 framebuffer, larger |
213 |
o) nr of simultaneous ASIDs in use in the TLB, for MIPS |
sprites and fonts. |
214 |
o) percentage of time spent in different "states", such as |
|
215 |
running userland code, kernel code, or idling (for CPUs |
Alpha: |
216 |
that have such an instruction, or whenever the PC is |
x) OSF1 PALcode, Virtual memory support. |
217 |
inside a specific idle-function (address range)). |
x) PALcode replacement! PAL1E etc opcodes...? |
218 |
Possible additional state (for example on R3000): caches |
x) Interrupt/exception/trap handling. |
219 |
disabled. |
x) Floating point exception correctness. |
220 |
o) position of read/write on (SCSI) disks |
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: |
225 |
|
o) Implement Adress space identifiers; load/stores etc. |
226 |
|
o) Save/restore register windows etc! Both v9 and pre-v9! |
227 |
|
o) Finish the subcc and addcc flag computation code. |
228 |
|
o) Add more registers (floating point, control regs etc) |
229 |
|
o) Exception/trap handling. |
230 |
|
o) Disassemly of some more instructions? |
231 |
|
o) Are sll etc 32-bit sign-extending or zero-extending? |
232 |
|
o) Finish the GDB register stuff. |
233 |
|
x) Floating point exception correctness. |
234 |
|
o) SPARC v8, v7 etc? |
235 |
|
|
236 |
|
Debugger: |
237 |
|
o) How does SMP debugging work? Does it simply use "threads"? |
238 |
|
What if the guest OS (running on an emulated SMP machine) |
239 |
|
has a usertask running, with userland threads? |
240 |
|
o) Try to make the debugger more modular and, if possible, reentrant! |
241 |
|
o) Remove the emul command? (But show network info if showing |
242 |
|
machines?) |
243 |
|
o) Evaluate expressions within []? That would allow stuff like |
244 |
|
cpu[x] where x is an expression. |
245 |
|
o) Settings: |
246 |
|
x) Special handlers for Write! |
247 |
|
+) MIPS coproc regs |
248 |
|
+) Alpha/MIPS/SPARC zero registers |
249 |
|
+) x86 64/32/16-bit registers |
250 |
|
x) Value formatter for resulting output. |
251 |
|
o) see src/debugger.c for more |
252 |
|
|
253 |
|
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 |
271 |
|
x) 64-bit stuff: either Linux on G5, or perhaps some hobbyist |
272 |
|
version of AIX? (if there exists such a thing) |
273 |
|
x) macppc: adb controller; keyboard (for framebuffer mode) |
274 |
|
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: |
282 |
|
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: |
298 |
|
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 |
303 |
|
o) make the ata controller usable for FreeBSD! |
304 |
|
o) Zaurus emulation, for e.g. OpenBSD/zaurus |
305 |
|
o) Debian/cats crashes because of unimplemented coproc stuff. |
306 |
|
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: |
345 |
|
o) Command line flags for: |
346 |
|
o) CPU endianness? |
347 |
|
o) Cache sizes? (multiple levels) |
348 |
|
o) Separate from the CPU concept, so that multi-core CPUs sharing |
349 |
|
e.g. a L2 cache can be simulated (?) |
350 |
|
o) Instruction cache emulation is easiest (if separate from the |
351 |
|
data cache); similar hack as the S;I; hack in cpu_dyntrans.c. |
352 |
|
NOTE: if the architecture has a delay slot, then an instruction |
353 |
|
slot can actually be executed as 2 instructions. |
354 |
|
o) Data cache emulation = harder; each arch's load/store routines |
355 |
|
must include support? running one instruction at a time and |
356 |
|
having a cpu-dependant lookup function for each instruction |
357 |
|
is another option (easier to implement, but very very slow). |
358 |
|
|
359 |
|
Documentation: |
360 |
|
x) Note about sandboxing/security: |
361 |
|
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 |
388 |
|
the same source file! |
389 |
|
o) Try to rewrite the install instructions for those machines |
390 |
|
that use 3MAX into using CATS or hpcmips? (To remove the need |
391 |
|
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! |
394 |
|
Causes: OpenBSD has low default limits for normal users. |
395 |
|
Host is 32-bit? (32-bit hosts are limited to 4 GB or less |
396 |
|
of userspace memory.) |
397 |
|
You are actually low on RAM. (As trivial as this might sound, |
398 |
|
Unix systems usually allow processes to allocate virtual |
399 |
|
memory beyond the amount of RAM in the machine.) |
400 |
|
|
401 |
|
The Device subsystem: |
402 |
|
x) allow devices to be moved and/or changed in size (down to a |
403 |
|
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 |
410 |
|
to be a bus might be a nice idea. |
411 |
|
x) turn interrupt controllers into devices? :-) |
412 |
|
x) refactor various clocks/nvram/cmos into one device? |
413 |
|
|
414 |
|
PCI: |
415 |
|
x) last write was ffffffff ==> fix this, it should be used |
416 |
|
together with a mask to get the correct bits. also, not ALL |
417 |
|
bits are size bits! (lowest 4 vs lowest 2?) |
418 |
|
x) add support for address fixups |
419 |
|
x) generalize the interrupt routing stuff (lines etc) |
420 |
|
|
421 |
|
Clocks and timers: |
422 |
|
x) DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c! |
423 |
|
x) Test the 8253? Right now it doesn't seem to be used? |
424 |
|
x) NetWinder timeofday is incorrect! |
425 |
|
x) Cobalt TOD is incorrect! |
426 |
|
x) Go through all other machines, one by one, and fix them. |
427 |
|
|
428 |
|
Config file parser: |
429 |
|
o) Rewrite it from scratch! |
430 |
|
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 |
434 |
|
command line option) |
435 |
|
|
436 |
|
Floating point layer: |
437 |
|
o) make it common enough to be used by _all_ emulation modes |
438 |
|
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)? |
441 |
|
|
442 |
|
Userland emulation: |
443 |
|
x) Lots of stuff; freebsd and netbsd (and linux?) syscalls. |
444 |
|
x) Dynamic linking? Hm. |
445 |
|
|
446 |
|
Sound: |
447 |
|
x) generic sound framework |
448 |
|
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: |
453 |
|
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 |
455 |
|
in NetBSD itself, http://mail-index.netbsd.org/source-changes/ |
456 |
|
2005/11/06/0024.html suggests that.) |
457 |
|
NetBSD 4.x seems to work? :) |
458 |
|
|
459 |
|
Caches / memory hierarchies: (this is mostly MIPS-specific) |
460 |
|
o) src/memory*.c: Implement correct cache emulation for |
461 |
|
all CPU types. (currently only R2000/R3000 is implemented) |
462 |
|
(per CPU, multiple levels should be possible, associativity etc!) |
463 |
|
o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
464 |
|
o) Move the -S (fill mem with random) functionality into the |
465 |
|
memory.c subsystem, not machine.c or wherever it is now |
466 |
|
o) ECC stuff, simulation of memory errors? (Machine dependent) |
467 |
|
o) More than 4GB of emulated RAM, when run on a 32-bit host? |
468 |
|
(using manual swap-out of blocks to disk, ugly) |
469 |
|
o) A global command line option should be used to turn |
470 |
|
cache emulation on or off. When off, caches should be |
471 |
|
faked like they are right now. When on, caches and |
472 |
|
memory latencies should be emulated as correctly as |
473 |
|
possible. |
474 |
|
|
475 |
|
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 |
479 |
|
Ultrix kernels that are actually disk images? |
480 |
|
o) Better handling of tape files |
481 |
|
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. |
483 |
|
Microsoft's C++, so multiple schemes must be possible. See |
484 |
|
URL at top of src/symbol_demangle.c for more info. |
485 |
|
|
486 |
|
Userland ABI emulation: |
487 |
|
o) see src/useremul.c |
488 |
|
|
489 |
|
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. |
493 |
|
o) Simple device access to framebuffer_blockcopyfill() etc, |
494 |
|
and text output (using the built-in fonts), for dev_fb. |
495 |
|
o) CLEAN UP the ugly event code |
496 |
|
o) Mouse clicks can be "missed" in the current system; this is |
497 |
|
not good. They should be put on a stack of some kind. |
498 |
|
o) More 2D and 3D framebuffer acceleration. |
499 |
|
o) Non-resizable windows? Or choose scaledown depending |
500 |
|
on size (and center the image, with a black border). |
501 |
|
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) |
504 |
|
o) Bug reported by Elijah Rutschman on MacOS with weird |
505 |
|
keys (F5 = cursor down?). |
506 |
|
o) Keyboard and mouse events: |
507 |
|
x) Do this for more machines than just DECstation |
508 |
|
x) more X11 cursor keycodes |
509 |
|
x) Keys like CTRL, ALT, SHIFT do not get through |
510 |
|
by themselves (these are necessary for example |
511 |
|
to change the font of an xterm in X in the |
512 |
|
emulator) |
513 |
|
o) Generalize the framebuffer stuff by moving _ALL_ X11 |
514 |
|
specific code to src/x11.c! |
515 |
|
|