--- trunk/TODO 2007/10/08 16:19:23 20 +++ trunk/TODO 2007/10/08 16:19:37 22 @@ -1,155 +1,233 @@ -$Id: TODO,v 1.176 2005/11/13 00:14:05 debug Exp $ +$Id: TODO,v 1.209 2006/02/18 21:03:09 debug Exp $ -NOTE: This TODO is hopefully out-of-date. I don't keep it updated. +Hm. This file is in random order, and not all parts of it are up-to-date. -=============================================================================== - -Old MIPS bintrans: - x) call/return address cache? - x) Turn the MIPS cpu family stuff into dyntrans. +Algor: PCI and ISA and LOCAL interrupts! --> wdc could start working + Add interrupt controller in dev_algor.c. Dyntrans: - x) Separate data and instruction translations? - x) Generalize the inline quick_pc_to_pointers? - x) Call/return hints... - x) More 64-bit stuff. + TOP Priority: + x) 64-bit stuff: good generic virtual memory translation, and + other structures. not all 64 bits need to be used + (e.g. Alpha) + x) Delay slots! + x) Old MIPS -> dyntrans! + Other stuff: + x) INVALIDATION should cause translations in _all_ cpus to be + invalidated, e.g. on a write to a write-protected page + (containing code) + x) Think about sharing code between CPUs of the same + arch/bitlength/endianness (the translation caches). + (Eg. a little-endian R4000 and a little-endian R5000 could + share code, but not an R3000 and an R4000.) + x) better (meaningful) instr call statistics + x) Call/return hints? + x) 16-bit encodings? (MIPS16, ARM Thumb, SH3, ...) + x) PPC optimizations; instr combs + x) Alpha + x) SPARC + x) PPC (64-bit stuff) x) Lots of other stuff: see src/cpus/README_DYNTRANS + x) true recompilation backend? think carefully about this, + experiment in a separate project (not in GXemul) + +More generic out_of_memory error reporting, and check everywhere! + Causes: OpenBSD has low default limits for normal users. + Host is 32-bit? (32-bit hosts are limited to 4 GB or less + of userspace memory.) + You are actually low on RAM. (As trivial as this might sound, + Unix systems usually allow processes to allocate virtual + memory beyond the amount of RAM in the machine.) + +Breakpoints: 32-bit vs 64-bit sign extension for MIPS, warnings, etc. + Use the debugger's symbolic name stuff. (which will have to be + extended soon to support stuff like "2*x + symbol + y" etc. cool + stuff) + +Sprite (guest OS for DECstation emulation) + x) Timing problems during bootup? + +The Device subsystem: + x) allow devices to be moved and/or changed in size (down to a + minimum size, etc, or up to a max size) + x) keep track of interrupts and busses? actually, allowing any device + to be a bus might be a nice idea + x) refactor various clocks/nvram/cmos into one device? + +ARM: + o) add ID for "i80321 600MHz rev 2 (XScale core)" + o) make the ata controller usable for FreeBSD! + x) zaurus for openbsd... + +PCI: + x) add support for address fixups + x) generalize the interrupt routing stuff (lines etc). this should + be per machine? or per bus, that's better + +MacPPC: + x) dev_zs / interrupts? + x) adb controller; keyboard + x) make OpenBSD/macppc work (PCI controller stuff) + +Network layer: + o) DHCP (for Debian and BSD installers :-) + o) increase performance + o) don't rely on NetBSD-ish usage + o) Multiple networks per emulation, and let different + NICs in machines connect to different networks. + o) many other issues: see src/net.c + +Busses: + o) Redesign the entire "mainbus" concept! + o) Busses should be placed in a hierarchical tree! + o) Easily configurable interrupt routing in SMP systems. + o) Specific clock/bus speeds, cpu speeds etc. + o) Synchronization over network? or at least in dyntrans within + one emulated machine + o) dev->bus: TurboChannel, PCMCIA, ADB? + +Config file parser: + o) Refresh/rewrite it :) + o) Usage of any expression available through the debugger + o) Expressions such as "add device" would be nice to be able + to do on the command line manually. + o) Allow machine() entries even if there is no emul() entry (but + then don't allow any emul() entries at all). + o) Support for running debugger commands (like the -c + command line option) + +Floating point layer: + o) make it common enough to be used by _all_ emulation modes + o) non-IEEE modes (i.e. x86)? Userland emulation: - x) Lots of stuff. + x) Lots of stuff; freebsd and netbsd (and linux?) syscalls. x) Dynamic linking? Hm. -Misc: - Redesign the entire "mainbus" concept: - o) Easily configurable interrupt routing in SMP systems. - o) Specific clock/bus speeds, cpu speeds etc. - o) Synchronization over network? - - Caches / memory hierarchies: (this is mostly MIPS-specific) - o) MIPS coproc.c: bits in config registers should reflect - correct cache sizes for _all_ CPU types. (currently only - implemented for R4000, R1x000, and a few others) - o) src/memory*.c: Implement correct cache emulation for - all CPU types. (currently only R2000/R3000 is implemented) - (per CPU, multiple levels should be possible, - associativity etc!) - o) R2000/R3000 isn't _100%_ correct, just almost correct :) - o) Move the -S (fill mem with random) functionality into the - memory.c subsystem, not machine.c or wherever it is now - o) ECC stuff, simulation of memory errors? (Machine dependant) - o) More than 4GB of emulated RAM, when run on a 32-bit host? - (using manual swap-out of blocks to disk, ugly) - o) A global command line option should be used to turn - cache emulation on or off. When off, caches should be - faked like they are right now. When on, caches and - memory latencies should be emulated as correctly as - possible. - - Network layer: - o) Multiple networks per emulation, and let different - NICs in machines connect to different networks. - o) many other issues: see src/net.c - - MIPS CPU emulation: - o) i386 bintrans backend: movn etc, slt[u] for - 64-bit mode, 64-bit shifts etc - o) Instructions: - o) All ISAs: - o) Floating point exception handling, and - add more instructions. - o) Finish the MIPS16 translator, and test it! - o) MIPS ISA I, II, III, IV - o) MIPS V (SIMD vector stuff?) - o) MDMX (MIPS Digital Media Extension) - o) MIPS 3D - o) MIPS MT (Multi-thread stuff) (What's this?) - o) Warn about mis-used bit fields (ie bits that - should be all zeroes, warn about if they are not)! - Both for coprocessor registers and for instruction - opcodes. - o) the special2 stuff is a mess right now - o) warn and/or cause exceptions for unimplemented - instructions (depending on CPU type) - o) R2000/R3000: - x) R3000 "tri-byte stores". (What's this?) - o) R4000 and others: - x) watchhi/watchlo exceptions, and other exception - handling details - o) R10000 and others: (R12000, R14000 ?) - x) memory space, exceptions, ... - x) use cop0 framemask for tlb lookups - (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) - o) Implement load delays? Warnings on interlocks. - o) Implement all coprocessor 0 bits / functions. - x) coproc 0 selectors! (R4000 ?) - o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird - TLB/cache? 128-bit GPRs, new instructions), - 4K (note: NOT R4000), 5K (note: NOT R5000), - R6000 (ISA II), R8000 - o) Multi-cpu stuff: - +) Interrupt routing (ie devices vs mainbus, or - connect each device to a fixed cpu) - +) SGI's NUMA architecture. Study - x) Linux sources - x) SGI's specs on NUMA address space - +) Ultrix? NetBSD doesn't do SMP on MIPS yet :-( - +) Own experiments with ycx2. - - File/disk handling: - o) Better handling of tape files - - Debugger: - o) Read function argument count and types from binaries? (ELF?) - o) Demangle C++ names. - o) see src/debugger.c for more stuff - - Userland ABI emulation: - o) see src/useremul.c - - Terminal/console stuff: - o) allow emulated serial ports to be connected to the outside - world in a more generic way, or even to other emulated - machines(!) - - Regression tests. (Needs to be totally rewritten, the old framework - was removed because it was useless.) - - Save state of the whole emulated machine, to be able to load it back - in later? (Memory, all device's states, all registers and - so on. Like taking a snapshot. (SimOS seems to do this, - according to its website.)) - - Better X-windows functionality: - o) CLEAN UP the ugly event code - o) Mouse clicks can be "missed" in the current system; this is - not good. They should be put on a stack of some kind. - o) More 2D and 3D framebuffer acceleration. - o) Non-resizable windows? Or choose scaledown depending - on size (and center the image, with a black border). - o) Different scaledown on different windows? - o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) - o) Keyboard and mouse events: - x) Do this for more machines than just DECstation - x) more X11 cursor keycodes - x) Keys like CTRL, ALT, SHIFT do not get through - by themselves (these are necessary for example - to change the font of an xterm in X in the - emulator) - o) Generalize the framebuffer stuff by moving _ALL_ X11 - specific code to src/x11.c! - - Statistics: (this could be interesting) - o) Save to file and show graphics. It should be possible to - run gxemul after a simulation to just show the graphics, - or convert to a .ppm or .tga or similar. - o) memory accesses (to measure cache efficiency and - page coloring efficiency) - o) nr of simultaneous ASIDs in use in the TLB, for MIPS - o) percentage of time spent in different "states", such as - running userland code, kernel code, or idling (for CPUs - that have such an instruction, or whenever the PC is - inside a specific idle-function (address range)). - Possible additional state (for example on R3000): caches - disabled. - o) position of read/write on (SCSI) disks +Sound: + x) generic sound framework + x) add one or more sound cards as devices + +Caches / memory hierarchies: (this is mostly MIPS-specific) + o) MIPS coproc.c: bits in config registers should reflect + correct cache sizes for _all_ CPU types. (currently only + implemented for R4000, R1x000, and a few others) + o) src/memory*.c: Implement correct cache emulation for + all CPU types. (currently only R2000/R3000 is implemented) + (per CPU, multiple levels should be possible, + associativity etc!) + o) R2000/R3000 isn't _100%_ correct, just almost correct :) + o) Move the -S (fill mem with random) functionality into the + memory.c subsystem, not machine.c or wherever it is now + o) ECC stuff, simulation of memory errors? (Machine dependent) + o) More than 4GB of emulated RAM, when run on a 32-bit host? + (using manual swap-out of blocks to disk, ugly) + o) A global command line option should be used to turn + cache emulation on or off. When off, caches should be + faked like they are right now. When on, caches and + memory latencies should be emulated as correctly as + possible. + +MIPS CPU emulation: (note: this is for the OLD mips stuff) + o) i386 bintrans backend: movn etc, slt[u] for + 64-bit mode, 64-bit shifts etc + o) Instructions: + o) All ISAs: + o) Floating point exception handling, and + add more instructions. + o) Finish the MIPS16 translator, and test it! + o) MIPS ISA I, II, III, IV + o) MIPS V (SIMD vector stuff?) + o) MDMX (MIPS Digital Media Extension) + o) MIPS 3D + o) MIPS MT (Multi-thread stuff) (What's this?) + o) Warn about mis-used bit fields (ie bits that + should be all zeroes, warn about if they are not)! + Both for coprocessor registers and for instruction + opcodes. + o) the special2 stuff is a mess right now + o) warn and/or cause exceptions for unimplemented + instructions (depending on CPU type) + o) R2000/R3000: + x) R3000 "tri-byte stores". (What's this?) + o) R4000 and others: + x) watchhi/watchlo exceptions, and other exception + handling details + o) R10000 and others: (R12000, R14000 ?) + x) memory space, exceptions, ... + x) use cop0 framemask for tlb lookups + (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) + o) Implement load delays? Warnings on interlocks. + o) Implement all coprocessor 0 bits / functions. + x) coproc 0 selectors! (R4000 ?) + o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird + TLB/cache? 128-bit GPRs, new instructions), + 4K (note: NOT R4000), 5K (note: NOT R5000), + R6000 (ISA II), R8000 + o) Multi-cpu stuff: + +) Interrupt routing (ie devices vs mainbus, or + connect each device to a fixed cpu) + +) SGI's NUMA architecture. Study + x) Linux sources + x) SGI's specs on NUMA address space + +) Ultrix? NetBSD doesn't do SMP on MIPS yet :-( + +) Own experiments with ycx2. + +File/disk/symbol handling: + o) Better handling of tape files + o) Read function argument count and types from binaries? (ELF?) + o) Demangle C++ names. + +Debugger: + o) see src/debugger.c for more + +Userland ABI emulation: + o) see src/useremul.c + +Terminal/console: + o) allow emulated serial ports to be connected to the outside + world in a more generic way, or even to other emulated + machines(?) + +Save state of the whole emulated machine, to be able to load it back + in later? (Memory, all device's states, all registers and + so on. Like taking a snapshot. (SimOS seems to do this, + according to its website.)) + +Better framebuffer and X-windows functionality: + o) -Yx sometimes causes crashes. + o) Simple device access to framebuffer_blockcopyfill() etc, + and text output (using the built-in fonts), for dev_fb. + o) CLEAN UP the ugly event code + o) Mouse clicks can be "missed" in the current system; this is + not good. They should be put on a stack of some kind. + o) More 2D and 3D framebuffer acceleration. + o) Non-resizable windows? Or choose scaledown depending + on size (and center the image, with a black border). + o) Different scaledown on different windows? + o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus) + o) Keyboard and mouse events: + x) Do this for more machines than just DECstation + x) more X11 cursor keycodes + x) Keys like CTRL, ALT, SHIFT do not get through + by themselves (these are necessary for example + to change the font of an xterm in X in the + emulator) + o) Generalize the framebuffer stuff by moving _ALL_ X11 + specific code to src/x11.c! + +Statistics: (this could be interesting) + o) Save to file and show graphics. It should be possible to + run gxemul after a simulation to just show the graphics, + or convert to a .ppm or .tga or similar. + o) memory accesses (to measure cache efficiency and + page coloring efficiency) + o) nr of simultaneous ASIDs in use in the TLB, for MIPS + o) percentage of time spent in different "states", such as + running userland code, kernel code, or idling (for CPUs + that have such an instruction, or whenever the PC is + inside a specific idle-function (address range)). + Possible additional state (for example on R3000): caches + disabled. + o) position of read/write on (SCSI) disks