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$Id: TODO,v 1.127 2005/04/15 21:39:54 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. |
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Order is random. Don't trust it to be up-to-date. |
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Caches / memory hierarchies: (this is mostly MIPS-specific) |
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o) MIPS coproc.c: bits in config registers should reflect |
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correct cache sizes for _all_ CPU types. (currently only |
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implemented for R4000, R1x000, and a few others) |
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o) src/memory*.c: Implement correct cache emulation for |
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all CPU types. (currently only R2000/R3000 is implemented) |
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(per CPU, multiple levels should be possible, |
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associativity etc!) |
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o) R2000/R3000 isn't _100%_ correct, just almost correct :) |
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o) Move the -S (fill mem with random) functionality into the |
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memory.c subsystem, not machine.c or wherever it is now |
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o) ECC stuff, simulation of memory errors? (Machine dependant) |
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o) More than 4GB of emulated RAM, when run on a 32-bit host? |
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(using manual swap-out of blocks to disk, ugly) |
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o) A global command line option should be used to turn |
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cache emulation on or off. When off, caches should be |
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faked like they are right now. When on, caches and |
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memory latencies should be emulated as correctly as |
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possible. |
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|
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Network layer: |
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o) Multiple networks per emulation, and let different |
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NICs in machines connect to different networks. |
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o) Network across multiple hosts. |
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o) Fixed MAC addresses for NICs, fixed IPv4 addresses if |
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DHCP or RARP is used. |
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o) many other issues: see src/net.c |
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|
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Configure script: |
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o) Only enable Alpha prefetch on pca56 etc, not on ev4, ev5. |
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o) Use getopts? |
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o) X11 libs and headers via command line option? |
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o) Verify that the configure script, building and running |
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the emulator works on some platforms: |
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+) Irix, AIX, QNX |
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+) MacOS X (I've not tried this personally yet) |
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+) Ultrix using gcc? (Inside the emulator) |
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|
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CPU emulation: |
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o) Binary translation: |
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+) use an Intermediate Representation! |
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+) recursive translation? |
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+) basic blocks instead of one-instruction? :) |
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+) on Alpha: don't assume pca56-like byte load/store? |
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+) write backends for UltraSparc and MIPS |
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+) see src/bintrans.c for more info |
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o) All the non-MIPS modes need a bit of work. |
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|
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MIPS CPU emulation: |
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o) Instructions: |
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o) Regression tests (see tests/README for more info): |
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o) Floating point exception handling, and |
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add more instructions. |
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o) Finish the MIPS16 translator, and test it! |
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o) MIPS ISA I, II, III, IV |
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o) MIPS V (SIMD vector stuff?) |
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o) MDMX (MIPS Digital Media Extension) |
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o) MIPS 3D |
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o) MIPS MT (Multi-thread stuff) (What's this?) |
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o) Warn about mis-used bit fields (ie bits that |
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should be all zeroes, warn about if they are not)! |
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Both for coprocessor registers and for instruction |
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opcodes. |
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o) the special2 stuff is a mess right now |
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o) warn and/or cause exceptions for unimplemented |
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instructions (depending on CPU type) |
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o) R2000/R3000: |
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x) R3000 "tri-byte stores". (What's this?) |
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o) R4000 and others: |
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x) watchhi/watchlo exceptions, and other exception |
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handling details |
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o) R10000 and others: (R12000, R14000 ?) |
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x) memory space, exceptions, ... |
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x) use cop0 framemask for tlb lookups |
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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) |
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o) Implement load delays? Warnings on interlocks. |
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o) Implement all coprocessor 0 bits / functions. |
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x) coproc 0 selectors! (R4000 ?) |
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o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird |
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TLB/cache? 128-bit GPRs, new instructions), |
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4K (note: NOT R4000), 5K (note: NOT R5000), |
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R6000 (ISA II), R8000 |
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o) Multi-cpu stuff: |
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+) SGI's NUMA architecture. Study |
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x) Linux sources |
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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 :-( |
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+) Own experiments with ycx2. |
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|
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Emulation of specific machines and devices: |
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o) Clean up stuff to make it possible to emulate multiple |
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(different) machines simultaneously. |
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o) Use same clock for all emulations and machines. |
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o) Clean up the device stuff (registering of devices etc) |
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o) Various SCSI and IDE controllers |
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o) PS/2-style keyboard controller (for several machines) |
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o) Generic busses; |
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x) PCI: i/o and interrupts |
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x) QBus-22 (DECsystem 5500, 5400?) |
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o) DECstations (pmax): |
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x) ioasic |
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x) framebuffers: |
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+) better cursor support, overlays?, |
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+) 2D/3D acceleration, PX[G] |
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x) status words / control words, make this more |
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portable/cleaner |
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x) scsi controller(s): sii, DMA for asc |
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x) serial controllers: ssc, scc (and more work on dc?) |
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x) nvram on decstation 5000/125: when using X11, |
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set console=g or similar |
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x) DECstation 5840? "xbi-based SMP" |
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o) SGI and ARC machines (sgimips, arc): |
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x) IP32 ("O2"): (Lots of stuff) |
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+) mec (ethernet) |
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+) pci |
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+) ahc (scsi) |
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+) ps2 kbd |
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+) memory controller |
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+) framebuffer/graphics |
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+) caches |
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x) more ARCBIOS stuff |
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x) Memory/interrupt controllers |
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x) IP30 (Linux with graphics support?) |
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x) SMP / NUMA? (SGI and various ARC machines) |
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o) Playstation 2: |
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Hardware: OHCI usb controller, keyboard, ... |
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o) Cobalt: PCI and interrupt system, ethernet, |
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harddisk controller(s) |
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o) Less interesting platforms: |
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o) newsmips: |
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o) NetBSD/newsmips, get it to detect a "real" |
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model, right now everything is 100% bogus |
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o) mipsco? (NetBSD) |
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o) wgrisc? (big endian R3000, in OpenBSD's attic) |
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o) other embedded / evaluation MIPS boards |
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o) Playstation 1? R3000A. Weird hardware? |
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No FPU, but something as coproc 2. |
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o) Nintendo 64, http://www.nintendo.com/systems/n64/n64_specs.jsp |
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(R4300, 4MB RAM, really weird memory map) |
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o) non-MIPS |
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File/disk handling: |
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o) More than one type of disk in a machine (say, IDE + FLOPPY, |
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or SCSI + IDE); how to handle this nicely? |
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o) Read function argument count and types from binaries? (ELF?) |
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o) ELF: separate LE/BE (MIPS instruction format) from LSB/MSB |
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(ELF structure format)? |
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o) Better handling of tape files |
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|
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Userland ABI emulation: |
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o) see src/useremul.c |
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|
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Terminal based interactive debugger: |
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o) see src/debugger.c |
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|
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GDB interface? (Maybe not necessary; the built-in debugger feels |
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more useful.) |
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|
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GUI, interactive debugger? GTK+? (The GUI _must be optional_!) |
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o) Breakpoints (complex expressions? combinations of register |
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states, memory accesses and so on) |
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o) Instruction trace |
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o) Disassembly of RAM (_NOT_ the same as instruction trace) |
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o) Function call trace |
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o) Inspection of CPU registers/state, coprocessor |
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registers/state, any device registers/state/contents |
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o) Framebuffers in windows / tabs. |
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o) Contents of RAM |
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o) "Start new emulation" should allow amount of |
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RAM and nr of cpus to easily be specified. |
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Multiple simultaneous machines should be possible. |
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o) Disk images. |
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Regression tests: |
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o) see tests/ |
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|
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Save state of the whole emulated machine, to be able to load it back |
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in later? (Memory, all device's states, all registers and |
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so on. Like taking a snapshot. (SimOS seems to do this, |
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according to its website.)) |
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|
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Better X-windows functionality: |
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o) CLEAN UP the ugly event code |
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o) Mouse clicks can be "missed" in the current system; this is |
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not good. They should be put on a stack of some kind. |
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o) More 2D and 3D framebuffer acceleration. |
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o) Non-resizable windows? Or choose scaledown depending |
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on size (and center the image, with a black border). |
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o) Different scaledown on different windows? |
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o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) |
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o) Keyboard and mouse events: |
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x) Do this for more machines than just DECstation |
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x) more X11 cursor keycodes |
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x) Keys like CTRL, ALT, SHIFT do not get through |
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by themselves (these are necessary for example |
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to change the font of an xterm in X in the |
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emulator) |
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o) Generalize the framebuffer stuff by moving _ALL_ X11 |
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specific code to src/x11.c! |
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|
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Statistics: (this could be interesting) |
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o) Save to file and show graphics. It should be possible to |
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run gxemul after a simulation to just show the graphics, |
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or convert to a .ppm or .tga or similar. |
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o) memory accesses (to measure cache efficiency and |
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page coloring efficiency) |
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o) nr of simultaneous ASIDs in use in the TLB, for MIPS |
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o) percentage of time spent in different "states", such as |
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running userland code, kernel code, or idling (for CPUs |
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that have such an instruction, or whenever the PC is |
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inside a specific idle-function (address range)). |
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Possible additional state (for example on R3000): caches |
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disabled. |
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o) position of read/write on (SCSI) disks |
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