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$Id: TODO,v 1.127 2005/04/15 21:39:54 debug Exp $ |
$Id: TODO,v 1.410 2006/11/06 05:32:38 debug Exp $ |
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Here's a short list of what I have left to do on GXemul. This file is a mess. |
This file is my list of things I want to work on in the future. It is in |
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Order is random. Don't trust it to be up-to-date. |
random order, and some parts of it are probably out-to-date by now. |
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Caches / memory hierarchies: (this is mostly MIPS-specific) |
Dyntrans: |
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o) MIPS coproc.c: bits in config registers should reflect |
x) Instruction combination collisions? How to avoid easily... |
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correct cache sizes for _all_ CPU types. (currently only |
x) Think about how to do both SHmedia and SHcompact in a reasonable |
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implemented for R4000, R1x000, and a few others) |
way! (Or AMD64 long/protected/real, for that matter.) |
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o) src/memory*.c: Implement correct cache emulation for |
x) 68K emulation; think about how to do variable instruction |
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all CPU types. (currently only R2000/R3000 is implemented) |
lengths across page boundaries. |
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(per CPU, multiple levels should be possible, |
x) Dyntrans with valgrind-inspired memory checker. (In memory_rw, |
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associativity etc!) |
it would be reasonably simple to add; in each individual fast |
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o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
load/store routine = a lot more work, and it would become |
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o) Move the -S (fill mem with random) functionality into the |
kludgy very fast.) |
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memory.c subsystem, not machine.c or wherever it is now |
x) Dyntrans with SMP... lots of work to be done here. |
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o) ECC stuff, simulation of memory errors? (Machine dependant) |
x) Dyntrans with cache emulation... lots of work here as well. |
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o) More than 4GB of emulated RAM, when run on a 32-bit host? |
o) dev_mp doesn't work well with dyntrans yet |
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(using manual swap-out of blocks to disk, ugly) |
o) In general, IPIs, CAS, LL/SC etc must be made to work with dyntrans |
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o) A global command line option should be used to turn |
x) Redesign/rethink the delay slot mechanism used for e.g. MIPS, |
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cache emulation on or off. When off, caches should be |
so that it caches a translation (that is, an instruction |
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faked like they are right now. When on, caches and |
word and the instr_call it was translated to the last |
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memory latencies should be emulated as correctly as |
time), so that it doesn't need to do slow |
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possible. |
to_be_translated for each end of page? |
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x) Program Counter statistics: |
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Network layer: |
Per machine? What about SMP? All data to the same file? |
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o) Multiple networks per emulation, and let different |
A debugger command should be possible to use to enable/ |
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NICs in machines connect to different networks. |
disable statistics gathering. |
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o) Network across multiple hosts. |
Configuration file option! |
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o) Fixed MAC addresses for NICs, fixed IPv4 addresses if |
x) Breakpoints: |
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DHCP or RARP is used. |
o) Physical vs virtual addresses! |
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o) many other issues: see src/net.c |
o) 32-bit vs 64-bit sign extension for MIPS, and others? |
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x) INVALIDATION should cause translations in _all_ cpus to be |
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Configure script: |
invalidated, e.g. on a write to a write-protected page |
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o) Only enable Alpha prefetch on pca56 etc, not on ev4, ev5. |
(containing code) |
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o) Use getopts? |
x) 16-bit encodings? (MIPS16, ARM Thumb, 32-bit SH on SH64) |
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o) X11 libs and headers via command line option? |
x) Lots of other stuff: see src/cpus/README_DYNTRANS |
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o) Verify that the configure script, building and running |
x) true recompilation backend? think carefully about this, |
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the emulator works on some platforms: |
experiment in a separate project (not in GXemul) |
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+) Irix, AIX, QNX |
o) First test would be to just implement a simple |
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+) MacOS X (I've not tried this personally yet) |
instruction such as MIPS' addiu or lui, on AMD64 |
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+) Ultrix using gcc? (Inside the emulator) |
hosts... |
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CPU emulation: |
Simple Valgrind-like checks? |
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o) Binary translation: |
o) Mark every address with bits which tell whether or not the address |
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+) use an Intermediate Representation! |
has been written to. |
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+) recursive translation? |
o) What should happen when programs are loaded? Text/data, bss (zero |
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+) basic blocks instead of one-instruction? :) |
filled). But stack space and heap is uninitialized. |
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+) on Alpha: don't assume pca56-like byte load/store? |
o) Uninitialized local variables: |
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+) write backends for UltraSparc and MIPS |
A load from a place on the stack which has not previously |
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+) see src/bintrans.c for more info |
been stored to => warning. Increasing the stack pointer using |
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o) All the non-MIPS modes need a bit of work. |
any available means should reset the memory to uninitialized. |
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o) If calls to malloc() and free() can be intercepted: |
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MIPS CPU emulation: |
o) Access to a memory area after free() => warning. |
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o) Instructions: |
o) Memory returned by malloc() is marked as not-initialized. |
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o) Regression tests (see tests/README for more info): |
o) Non-passive, but good to have: Change the argument |
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o) Floating point exception handling, and |
given to malloc, to return a slightly larger memory |
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add more instructions. |
area, i.e. margin_before + size + margin_after, |
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o) Finish the MIPS16 translator, and test it! |
and return the pointer + margin_before. |
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o) MIPS ISA I, II, III, IV |
Any access to the margin_before or _after space results |
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o) MIPS V (SIMD vector stuff?) |
in warnings. (free() must be modified to free the |
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o) MDMX (MIPS Digital Media Extension) |
actually allocated address.) |
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o) MIPS 3D |
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o) MIPS MT (Multi-thread stuff) (What's this?) |
MIPS: |
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o) Warn about mis-used bit fields (ie bits that |
o) Nicer MIPS status bits in register dumps. |
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should be all zeroes, warn about if they are not)! |
o) Alignment exceptions. |
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Both for coprocessor registers and for instruction |
o) Floating point exception correctness. |
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opcodes. |
o) Fix this? Triggered by NetBSD/sgimips? Hm: |
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o) the special2 stuff is a mess right now |
to_be_translated(): TODO: unimplemented instruction: |
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o) warn and/or cause exceptions for unimplemented |
000000000065102c: 00200800 (d) rot_00 at,zr,0 |
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instructions (depending on CPU type) |
o) Some more work on opcodes. |
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o) R2000/R3000: |
x) MIPS64 revision 2. |
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x) R3000 "tri-byte stores". (What's this?) |
o) Find out which actual CPUs implement the rev2 ISA! |
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o) R4000 and others: |
o) DROTR32 and similar MIPS64 rev 2 instructions, |
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x) watchhi/watchlo exceptions, and other exception |
which have a rotation bit which differs from |
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handling details |
previous ISAs. |
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o) R10000 and others: (R12000, R14000 ?) |
o) EI and DI instructions for MIPS64/32 rev 2. |
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x) memory space, exceptions, ... |
NOTE: These are _NOT_ the same as for R5900! |
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x) use cop0 framemask for tlb lookups |
x) _MAYBE_ TX79 and R5900 actually differ in their |
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(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) |
opcodes? Check this carefully! |
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o) Implement load delays? Warnings on interlocks. |
o) Dyntrans: Count register updates are probably not 100% correct yet. |
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o) Implement all coprocessor 0 bits / functions. |
o) Refactor code for performance and readability/maintainability. |
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x) coproc 0 selectors! (R4000 ?) |
o) (Re)implement 128-bit loads/stores for R5900. |
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o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird |
o) R4000 and others: |
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TLB/cache? 128-bit GPRs, new instructions), |
x) watchhi/watchlo exceptions, and other exception |
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4K (note: NOT R4000), 5K (note: NOT R5000), |
handling details |
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R6000 (ISA II), R8000 |
o) R10000 and others: (R12000, R14000 ?) |
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o) Multi-cpu stuff: |
x) memory space, exceptions, ... |
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+) SGI's NUMA architecture. Study |
x) use cop0 framemask for tlb lookups |
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x) Linux sources |
(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) |
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x) SGI's specs on NUMA address space |
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+) Ultrix? NetBSD doesn't do SMP on MIPS yet :-( |
SuperH: |
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+) Own experiments with ycx2. |
x) DMA (0xffa00000) |
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x) Instruction tracing should include symbols for branch targets, |
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Emulation of specific machines and devices: |
and so on... |
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o) Clean up stuff to make it possible to emulate multiple |
x) SH4 interrupt controller: |
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(different) machines simultaneously. |
x) Implement correct priorities of interrupts |
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o) Use same clock for all emulations and machines. |
x) SH4 BSC (Bus State Controller) |
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o) Clean up the device stuff (registering of devices etc) |
x) NetBSD/evbsh3, dreamcast, mmeye, hpcsh! Linux? |
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o) Various SCSI and IDE controllers |
x) Replace pc-relative loads with immediate load, if within the |
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o) PS/2-style keyboard controller (for several machines) |
same page. (Similar to the same optimization for ARM.) |
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o) Generic busses; |
x) Floating point exception correctness. |
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x) PCI: i/o and interrupts |
x) Floating point speed! |
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x) QBus-22 (DECsystem 5500, 5400?) |
x) Think carefully about how to implement SH5/SH64 (for evbsh5). |
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o) DECstations (pmax): |
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x) ioasic |
Dreamcast: |
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x) framebuffers: |
x) CD image bootup: |
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+) better cursor support, overlays?, |
0) Find IP.BIN, and load it to 0x8c008000. |
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+) 2D/3D acceleration, PX[G] |
1) Run code at 0x8c008300 (SEGA license code). |
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x) status words / control words, make this more |
2) When the license code runs a "boot menu" syscall, |
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portable/cleaner |
load the 1ST_READ.BIN file (unscrambled?) to 0x8c010000. |
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x) scsi controller(s): sii, DMA for asc |
3) Run code at 0x8c00b800 (Bootstrap 1). This will in turn |
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x) serial controllers: ssc, scc (and more work on dc?) |
jump to 0x8c00e000 (Bootstrap 2), and then jump to |
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x) nvram on decstation 5000/125: when using X11, |
0x8c010000, to start the program. |
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set console=g or similar |
(Try with e.g. Comstedt's Serial IP Slave, to make sure it |
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x) DECstation 5840? "xbi-based SMP" |
works as expected.) |
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o) SGI and ARC machines (sgimips, arc): |
x) LAN adapter. |
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x) IP32 ("O2"): (Lots of stuff) |
x) PVR: Lots of stuff. See dev_pvr.c. |
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+) mec (ethernet) |
x) Maple bus: |
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+) pci |
x) Correct controller input |
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+) ahc (scsi) |
x) Mouse input |
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+) ps2 kbd |
x) PROM/BIOS calls: |
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+) memory controller |
x) GD-ROM emulation |
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+) framebuffer/graphics |
x) NetBSD/dreamcast: Root on nfs? |
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+) caches |
x) Linux/dreamcast? (The gentoo kernel currently crashes.) |
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x) more ARCBIOS stuff |
x) More homebrew demos/games. |
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x) Memory/interrupt controllers |
x) Sound emulation (ARM cpu). |
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x) IP30 (Linux with graphics support?) |
x) VME processor emulation? |
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x) SMP / NUMA? (SGI and various ARC machines) |
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o) Playstation 2: |
Transputer: |
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Hardware: OHCI usb controller, keyboard, ... |
x) Implement support for Helios binaries. |
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o) Cobalt: PCI and interrupt system, ethernet, |
x) Stack and register contents at startup? |
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harddisk controller(s) |
x) Figure out how to boot an entire Helios distribution. |
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o) Less interesting platforms: |
x) Implement all instructions. :) |
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o) newsmips: |
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o) NetBSD/newsmips, get it to detect a "real" |
RCA1802/RCA1805, CHIP8: |
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model, right now everything is 100% bogus |
x) CHIP8 -> RCA180x conversion |
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o) mipsco? (NetBSD) |
x) Think about how to do dual-mode, variable-instr-length |
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o) wgrisc? (big endian R3000, in OpenBSD's attic) |
ISAs, and switch between modes. |
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o) other embedded / evaluation MIPS boards |
x) 1805 "extended" opcode -> trigger CHIP8 emulation? |
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o) Playstation 1? R3000A. Weird hardware? |
That is, all calls 0NNN could point to 0x68 opcodes, |
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No FPU, but something as coproc 2. |
which, if running on a 1802 in CHIP8-emulation-mode, |
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o) Nintendo 64, http://www.nintendo.com/systems/n64/n64_specs.jsp |
would be manually interpreted. |
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(R4300, 4MB RAM, really weird memory map) |
x) Better solution: |
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o) non-MIPS |
CHIP8 calls to 00xx => handle at high level, |
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calls to 0xxx in general = call 180X machine code |
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File/disk handling: |
(0000 = reboot?) |
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o) More than one type of disk in a machine (say, IDE + FLOPPY, |
x) 1802 info: http://www.nyx.net/~lturner/public_html/Cosmac.html |
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or SCSI + IDE); how to handle this nicely? |
and: http://www.elf-emulation.com/1802.html |
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o) Read function argument count and types from binaries? (ELF?) |
x) 1805 extended opcodes: Implement at least disassembly support! |
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o) ELF: separate LE/BE (MIPS instruction format) from LSB/MSB |
x) Keyboard input. |
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(ELF structure format)? |
x) Sound (beep only). |
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o) Better handling of tape files |
x) Slow-down to correct speed? Wikipedia: "it was usually operated |
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at 3.58 MHz/2 to suit the requirements of the 1861 chip which |
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Userland ABI emulation: |
gave a speed of a little over 100,000 instructions per second" |
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o) see src/useremul.c |
(Note that _CHIP8_ emulation would then be even slower.) |
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x) SCHIP48 (Super) emulation: |
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Terminal based interactive debugger: |
Some more opcodes, 128x64 framebuffer, larger |
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o) see src/debugger.c |
sprites and fonts. |
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GDB interface? (Maybe not necessary; the built-in debugger feels |
Alpha: |
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more useful.) |
x) OSF1 PALcode, Virtual memory support. |
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x) PALcode replacement! PAL1E etc opcodes...? |
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GUI, interactive debugger? GTK+? (The GUI _must be optional_!) |
x) Interrupt/exception/trap handling. |
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o) Breakpoints (complex expressions? combinations of register |
x) Floating point exception correctness. |
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states, memory accesses and so on) |
x) More work on bootup memory and register contents. |
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o) Instruction trace |
x) More Alpha machine types, so it could work with |
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o) Disassembly of RAM (_NOT_ the same as instruction trace) |
OpenBSD, FreeBSD, and Linux too? |
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o) Function call trace |
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o) Inspection of CPU registers/state, coprocessor |
SPARC: |
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registers/state, any device registers/state/contents |
o) Implement Adress space identifiers; load/stores etc. |
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o) Framebuffers in windows / tabs. |
o) Save/restore register windows etc! |
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o) Contents of RAM |
o) Finish the subcc and addcc flag computation code. |
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o) "Start new emulation" should allow amount of |
o) Add more registers (floating point, control regs etc) |
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RAM and nr of cpus to easily be specified. |
o) Exception/trap handling. |
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Multiple simultaneous machines should be possible. |
o) Disassemly of some more instructions? |
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o) Disk images. |
o) Are sll etc 32-bit sign-extending or zero-extending? |
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o) Finish the GDB register stuff. |
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Regression tests: |
x) Floating point exception correctness. |
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o) see tests/ |
o) SPARC v8, v7 etc? |
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Save state of the whole emulated machine, to be able to load it back |
Debugger: |
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in later? (Memory, all device's states, all registers and |
o) How does SMP debugging work? Does it simply use "threads"? |
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so on. Like taking a snapshot. (SimOS seems to do this, |
What if the guest OS (running on an emulated SMP machine) |
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according to its website.)) |
has a usertask running, with userland threads? |
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o) Try to make the debugger more modular and, if possible, reentrant! |
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Better X-windows functionality: |
o) Remove the emul command? (But show network info if showing |
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o) CLEAN UP the ugly event code |
machines?) |
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o) Mouse clicks can be "missed" in the current system; this is |
o) Settings: |
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not good. They should be put on a stack of some kind. |
x) Special handlers for Write! |
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o) More 2D and 3D framebuffer acceleration. |
+) MIPS coproc regs |
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o) Non-resizable windows? Or choose scaledown depending |
+) Alpha/MIPS/SPARC zero registers |
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on size (and center the image, with a black border). |
+) x86 64/32/16-bit registers |
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o) Different scaledown on different windows? |
x) Value formatter for resulting output. |
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o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
o) see src/debugger.c for more |
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o) Keyboard and mouse events: |
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x) Do this for more machines than just DECstation |
POWER/PowerPC: |
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x) more X11 cursor keycodes |
x) find and fix the bug which causes NetBSD/macppc to fail after |
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x) Keys like CTRL, ALT, SHIFT do not get through |
an install! |
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by themselves (these are necessary for example |
x) NetBSD/prep 3.x triggers a possible bug in the emulator: |
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to change the font of an xterm in X in the |
<wdc_exec_command(0xd005e514,0xd60cdd30,0,8,..)> |
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emulator) |
<ata_get_xfer(0,0xd60cdd30,0,8,..)> |
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o) Generalize the framebuffer stuff by moving _ALL_ X11 |
<0x26c550(&ata_xfer_pool,2,0,8,..)> |
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specific code to src/x11.c! |
<0x35c71c(0x3f27000,0,52,8,..)> |
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<ata_exec_xfer(0xd005e4c8,0x3f27000,0,13,..)> |
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Statistics: (this could be interesting) |
<atastart(0xd005e4c8,0x3f27000,0,13,..)> |
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o) Save to file and show graphics. It should be possible to |
<__wdccommand_start(0xd005e4c8,0x3f27000,0,13,..)> |
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run gxemul after a simulation to just show the graphics, |
<bsw1(&prep_isa_io_space_tag,0x800001f6,0,176,..)> |
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or convert to a .ppm or .tga or similar. |
[ wdc: write to SDH: 0xb0 (sectorsize 2, lba=1, drive 1, head 0) ] |
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o) memory accesses (to measure cache efficiency and |
<wdcwait(0xd005e4c8,72,64,0xbb8,..)> |
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page coloring efficiency) |
<0x198120(0xd005e4c8,72,64,0xbb8,..)> |
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o) nr of simultaneous ASIDs in use in the TLB, for MIPS |
<bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)> |
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o) percentage of time spent in different "states", such as |
<delay(100,0,0,0xbb8,..)> |
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running userland code, kernel code, or idling (for CPUs |
Note: <bsr1(&prep_isa_io_space_tag,0,0,0xbb8,..)> |
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that have such an instruction, or whenever the PC is |
x) PPC optimizations; instr combs |
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inside a specific idle-function (address range)). |
x) 64-bit stuff: either Linux on G5, or perhaps some hobbyist |
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Possible additional state (for example on R3000): caches |
version of AIX? (if there exists such a thing) |
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disabled. |
x) macppc: adb controller; keyboard (for framebuffer mode) |
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o) position of read/write on (SCSI) disks |
x) make OpenBSD/macppc work (PCI controller stuff) |
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x) Floating point exception correctness. |
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x) Alignment exceptions. |
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Algor: |
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o) Other models than the P5064? |
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o) PCI interrupts... needed for stuff like the tlp NIC? |
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HPCmips: |
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x) Mouse/pad support! :) |
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x) A NIC? (As a PCMCIA device?) |
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AVR: |
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o) Everything. |
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AVR32: |
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o) Everything. It would be good if there was NetBSD/avr32 to |
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experiment with... |
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ARM: |
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o) See netwinder_reset() in NetBSD; the current "an internal error |
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occured" message after reboot/halt is too ugly. |
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o) ARM "wait"-like instruction? |
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o) try to get netbsd/evbarm 3.x running (iq80321) |
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o) make the xscale counter registers (ccnt) work |
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o) make the ata controller usable for FreeBSD! |
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o) zaurus for openbsd... |
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o) debian/cats crashes because of unimplemented coproc stuff. |
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fix this? |
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Test machines: |
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+ dev_fb block fill and copy |
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+ dev_fb draw characters (from the built-in font)? |
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+ dev_fb input device? mouse pointer coordinates and buttons |
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(allow changes in these to cause interrupts as well?) |
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+ Redefine the halt() function so that it stops "sometimes |
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soon", i.e. usage in demo code should be: |
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for (;;) { |
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halt(); |
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} |
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Better CD Image file support: |
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x) Support CD formats that contain more than 1 track, e.g. |
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CDI files (?). These can then contain a mixture of e.g. sound |
| 264 |
|
and data tracks, and booting from an ISO filesystem path |
| 265 |
|
would boot from [by default] the first data track. |
| 266 |
|
(This would make sense for e.g. Dreamcast CD images, or |
| 267 |
|
possibly other live-CD formats.) |
| 268 |
|
|
| 269 |
|
Networking: |
| 270 |
|
x) Fix performance problems caused by only allowing a |
| 271 |
|
single TCP packet to be unacked. |
| 272 |
|
x) Don't hardcode offsets into packets! |
| 273 |
|
x) Test with lower than 100 max tcp/udp connections, |
| 274 |
|
to make sure that reuse works! |
| 275 |
|
x) Make OpenBSD work better as a guest OS! |
| 276 |
|
x) DHCP? Debian doesn't actually send DHCP packets, even |
| 277 |
|
though it claims to? So it is hard to test. |
| 278 |
|
x) Multiple networks per emulation, and let different |
| 279 |
|
NICs in machines connect to different networks. |
| 280 |
|
x) Support VDE (vde.sf.net)? Easiest/cleanest (before a |
| 281 |
|
redesign of the network framework has been done) is |
| 282 |
|
probably to connect it using the current (udp) solution. |
| 283 |
|
x) Allow SLIP connections, possibly PPP, in addition to |
| 284 |
|
ethernet? |
| 285 |
|
|
| 286 |
|
Cache simulation: |
| 287 |
|
o) Command line flags for: |
| 288 |
|
o) CPU endianness? |
| 289 |
|
o) Cache sizes? (multiple levels) |
| 290 |
|
o) Separate from the CPU concept, so that multi-core CPUs sharing |
| 291 |
|
e.g. a L2 cache can be simulated (?) |
| 292 |
|
o) Instruction cache emulation is easiest (if separate from the |
| 293 |
|
data cache); similar hack as the S;I; hack in cpu_dyntrans.c. |
| 294 |
|
NOTE: if the architecture has a delay slot, then an instruction |
| 295 |
|
slot can actually be executed as 2 instructions. |
| 296 |
|
o) Data cache emulation = harder; each arch's load/store routines |
| 297 |
|
must include support? running one instruction at a time and |
| 298 |
|
having a cpu-dependant lookup function for each instruction |
| 299 |
|
is another option (easier to implement, but very very slow). |
| 300 |
|
|
| 301 |
|
Documentation: |
| 302 |
|
x) Note about sandboxing/security: |
| 303 |
|
Not all emulated instructions fail in the way they would |
| 304 |
|
do on real hardware (e.g. a userspace program writing to |
| 305 |
|
a system register might work in GXemul, but it would |
| 306 |
|
fail on real hardware). Sandbox = contain from the |
| 307 |
|
host OS. But the emulated programs will run "less |
| 308 |
|
securely". |
| 309 |
|
x) Try NetBSD/arc 4.x! (It seems to work with disk images!) |
| 310 |
|
x) NetBSD/pmax 4 install instructions: xterm instead of vt100! |
| 311 |
|
x) DEVICE_TICK in technical.html |
| 312 |
|
x) Rewrite the section about experimental devices, after the |
| 313 |
|
framebuffer acceleration has been implemented, and demos |
| 314 |
|
written. (Symbolic names instead of numbers; example |
| 315 |
|
use cases, etc. Mention demo files that use the various |
| 316 |
|
features?) |
| 317 |
|
x) "a very simple linear framebuffer device (for graphics output)" |
| 318 |
|
under "which machines does gxemul emulate" ==> better |
| 319 |
|
description? |
| 320 |
|
x) Better description on how to set up a cross compiler? |
| 321 |
|
Example for MIPS64. |
| 322 |
|
o) Automagic documentation generation? |
| 323 |
|
x) machines, cpus, devices. |
| 324 |
|
x) REMEMBER that several machines/devices can be in |
| 325 |
|
the same source file! |
| 326 |
|
o) Try to rewrite the install instructions for those machines |
| 327 |
|
that use 3MAX into using CATS or hpcmips? (To remove the need |
| 328 |
|
to use a raw ffs partition, using up all of the disk image.) |
| 329 |
|
|
| 330 |
|
More generic out_of_memory error reporting, and check everywhere! |
| 331 |
|
Causes: OpenBSD has low default limits for normal users. |
| 332 |
|
Host is 32-bit? (32-bit hosts are limited to 4 GB or less |
| 333 |
|
of userspace memory.) |
| 334 |
|
You are actually low on RAM. (As trivial as this might sound, |
| 335 |
|
Unix systems usually allow processes to allocate virtual |
| 336 |
|
memory beyond the amount of RAM in the machine.) |
| 337 |
|
|
| 338 |
|
The Device subsystem: |
| 339 |
|
x) allow devices to be moved and/or changed in size (down to a |
| 340 |
|
minimum size, etc, or up to a max size); if there is a collision, |
| 341 |
|
return false. It is up to the caller to handle this situation! |
| 342 |
|
x) NOTE: Translations must be invalidated, both for |
| 343 |
|
registering new devices, and for moving existing ones. |
| 344 |
|
cpu->invalidate translation caches, for all CPUs that |
| 345 |
|
are connected to a specific memory. |
| 346 |
|
x) keep track of interrupts and busses? actually, allowing any device |
| 347 |
|
to be a bus might be a nice idea. |
| 348 |
|
x) turn interrupt controllers into devices? :-) |
| 349 |
|
x) refactor various clocks/nvram/cmos into one device? |
| 350 |
|
|
| 351 |
|
PCI: |
| 352 |
|
x) last write was ffffffff ==> fix this, it should be used |
| 353 |
|
together with a mask to get the correct bits. also, not ALL |
| 354 |
|
bits are size bits! (lowest 4 vs lowest 2?) |
| 355 |
|
x) add support for address fixups |
| 356 |
|
x) generalize the interrupt routing stuff (lines etc) |
| 357 |
|
|
| 358 |
|
Clocks and timers: |
| 359 |
|
x) DON'T HARDCODE 100 HZ IN cpu_mips_coproc.c! |
| 360 |
|
x) Test the 8253? Right now it doesn't seem to be used? |
| 361 |
|
x) NetWinder timeofday is incorrect! |
| 362 |
|
x) Cobalt TOD is incorrect! |
| 363 |
|
x) Go through all other machines, one by one, and fix them. |
| 364 |
|
|
| 365 |
|
Busses: |
| 366 |
|
o) Redesign the entire "mainbus" concept! |
| 367 |
|
x) Busses should be placed in a hierarchical tree (?) |
| 368 |
|
x) Specific clock/bus speeds, cpu speeds etc. |
| 369 |
|
o) Interrupt routing subsystem: |
| 370 |
|
x) IF POSSIBLE, try to make the new system work with the |
| 371 |
|
current system, but print annoying warning messages. :) |
| 372 |
|
Think carefully about this. |
| 373 |
|
x) Registry for all available interrupts. |
| 374 |
|
+) Each interrupt controller (including CPU cores |
| 375 |
|
that can handle interrupts) should register its |
| 376 |
|
interrupts, e.g. |
| 377 |
|
cpu[0].irq[3] |
| 378 |
|
cpu[0].irq[3].pcmcia_slot[1] |
| 379 |
|
cpu[0].irq.pci[3] |
| 380 |
|
+) Note: MIPS cpus have multiple irqs in the core, |
| 381 |
|
while some other CPUs only have one (irq[0] |
| 382 |
|
or just irq). |
| 383 |
|
x) Users should use interrupt _names_ instead of integers |
| 384 |
|
when attaching to an interrupt controller, but when |
| 385 |
|
asserting/deasserting irq lines, small integers must |
| 386 |
|
still be used (for obvious performance reasons). |
| 387 |
|
Figure out a way to do this nicely! |
| 388 |
|
x) Any users need to say whether they need the interrupt line |
| 389 |
|
exclusively or allow shared access. |
| 390 |
|
x) Must work with everything from native IRQs to |
| 391 |
|
TurboChannel/PCI/ISA/ADB/PCMCIA/... |
| 392 |
|
x) Must work with SMP emulation! |
| 393 |
|
x) Make it with device_add(). How does the end user find |
| 394 |
|
out the name of an interrupt controller/line in e.g. |
| 395 |
|
a configuration file? |
| 396 |
|
o) Synchronization over network? or at least in dyntrans within |
| 397 |
|
one emulated machine |
| 398 |
|
o) Convert to real busses: TurboChannel, PCMCIA, ADB |
| 399 |
|
|
| 400 |
|
Config file parser: |
| 401 |
|
o) Rewrite it from scratch! |
| 402 |
|
o) Usage of any expression available through the debugger |
| 403 |
|
o) Support for running debugger commands (like the -c |
| 404 |
|
command line option) |
| 405 |
|
|
| 406 |
|
Floating point layer: |
| 407 |
|
o) make it common enough to be used by _all_ emulation modes |
| 408 |
|
o) implement correct error/exception handling and rounding modes |
| 409 |
|
o) implement more helper functions (i.e. add, sub, mul...) |
| 410 |
|
o) non-IEEE modes (i.e. x86)? |
| 411 |
|
|
| 412 |
|
Userland emulation: |
| 413 |
|
x) Lots of stuff; freebsd and netbsd (and linux?) syscalls. |
| 414 |
|
x) Dynamic linking? Hm. |
| 415 |
|
|
| 416 |
|
Sound: |
| 417 |
|
x) generic sound framework |
| 418 |
|
x) add one or more sound cards as devices; add a testmachine |
| 419 |
|
sound card first? |
| 420 |
|
|
| 421 |
|
ASC SCSI controller: |
| 422 |
|
x) NetBSD/arc 2.0 uses the ASC controller in a way which GXemul |
| 423 |
|
cannot yet handle. (NetBSD 1.6.2 works ok.) (Possibly a problem |
| 424 |
|
in NetBSD itself, http://mail-index.netbsd.org/source-changes/ |
| 425 |
|
2005/11/06/0024.html suggests that.) |
| 426 |
|
NetBSD 4.x seems to work? :) |
| 427 |
|
|
| 428 |
|
Caches / memory hierarchies: (this is mostly MIPS-specific) |
| 429 |
|
o) src/memory*.c: Implement correct cache emulation for |
| 430 |
|
all CPU types. (currently only R2000/R3000 is implemented) |
| 431 |
|
(per CPU, multiple levels should be possible, associativity etc!) |
| 432 |
|
o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
| 433 |
|
o) Move the -S (fill mem with random) functionality into the |
| 434 |
|
memory.c subsystem, not machine.c or wherever it is now |
| 435 |
|
o) ECC stuff, simulation of memory errors? (Machine dependent) |
| 436 |
|
o) More than 4GB of emulated RAM, when run on a 32-bit host? |
| 437 |
|
(using manual swap-out of blocks to disk, ugly) |
| 438 |
|
o) A global command line option should be used to turn |
| 439 |
|
cache emulation on or off. When off, caches should be |
| 440 |
|
faked like they are right now. When on, caches and |
| 441 |
|
memory latencies should be emulated as correctly as |
| 442 |
|
possible. |
| 443 |
|
|
| 444 |
|
File/disk/symbol handling: |
| 445 |
|
o) Remove some of the complexity in file format guessing, for |
| 446 |
|
Ultrix kernels that are actually disk images? |
| 447 |
|
o) Better handling of tape files |
| 448 |
|
o) Read function argument count and types from binaries? (ELF?) |
| 449 |
|
o) Better demangling of C++ names. Note: GNU's C++ differs from e.g. |
| 450 |
|
Microsoft's C++, so multiple schemes must be possible. See |
| 451 |
|
URL at top of src/symbol_demangle.c for more info. |
| 452 |
|
|
| 453 |
|
Userland ABI emulation: |
| 454 |
|
o) see src/useremul.c |
| 455 |
|
|
| 456 |
|
Terminal/console: |
| 457 |
|
o) allow emulated serial ports to be connected to the outside |
| 458 |
|
world in a more generic way, or even to other emulated |
| 459 |
|
machines(?) |
| 460 |
|
|
| 461 |
|
Save state of the whole emulated machine, to be able to load it back |
| 462 |
|
in later? (Memory, all device's states, all registers and |
| 463 |
|
so on. Like taking a snapshot. (SimOS seems to do this, |
| 464 |
|
according to its website.)) |
| 465 |
|
|
| 466 |
|
Better framebuffer and X-windows functionality: |
| 467 |
|
o) Generalize the update_x1y1x2y2 stuff to an extend-region() |
| 468 |
|
function... |
| 469 |
|
o) -Yx sometimes causes crashes. |
| 470 |
|
o) Simple device access to framebuffer_blockcopyfill() etc, |
| 471 |
|
and text output (using the built-in fonts), for dev_fb. |
| 472 |
|
o) CLEAN UP the ugly event code |
| 473 |
|
o) Mouse clicks can be "missed" in the current system; this is |
| 474 |
|
not good. They should be put on a stack of some kind. |
| 475 |
|
o) More 2D and 3D framebuffer acceleration. |
| 476 |
|
o) Non-resizable windows? Or choose scaledown depending |
| 477 |
|
on size (and center the image, with a black border). |
| 478 |
|
o) Different scaledown on different windows? |
| 479 |
|
o) Non-integral scale-up? (E.g. 640x480 -> 1024x768) |
| 480 |
|
o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
| 481 |
|
o) Bug reported by Elijah Rutschman on MacOS with weird |
| 482 |
|
keys (F5 = cursor down?). |
| 483 |
|
o) Keyboard and mouse events: |
| 484 |
|
x) Do this for more machines than just DECstation |
| 485 |
|
x) more X11 cursor keycodes |
| 486 |
|
x) Keys like CTRL, ALT, SHIFT do not get through |
| 487 |
|
by themselves (these are necessary for example |
| 488 |
|
to change the font of an xterm in X in the |
| 489 |
|
emulator) |
| 490 |
|
o) Generalize the framebuffer stuff by moving _ALL_ X11 |
| 491 |
|
specific code to src/x11.c! |
| 492 |
|
|
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Revision Log
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Patch