/[gxemul]/trunk/TODO
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Revision 22 - (hide annotations)
Mon Oct 8 16:19:37 2007 UTC (13 years ago) by dpavlin
File size: 9155 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1121 2006/02/18 21:03:08 debug Exp $
20051126	Cobalt and PReP now work with the 21143 NIC.
		Continuing on Alpha dyntrans things.
		Fixing some more left-shift-by-24 to unsigned.
20051127	Working on OpenFirmware emulation; major cleanup/redesign.
		Progress on MacPPC emulation: NetBSD detects two CPUs (when
		running with -n 2), framebuffer output (for text) works.
		Adding quick-hack Bandit PCI controller and "gc" interrupt
		controller for MacPPC.
20051128	Changing from a Bandit to a Uni-North controller for macppc.
		Continuing on OpenFirmware and MacPPC emulation in general
		(obio controller, and wdc attached to the obio seems to work).
20051129	More work on MacPPC emulation (adding a dummy ADB controller).
		Continuing the PCI bus cleanup (endianness and tag composition)
		and rewriting all PCI controllers' access functions.
20051130	Various minor PPC dyntrans optimizations.
		Manually inlining some parts of the framebuffer redraw routine.
		Slowly beginning the conversion of the old MIPS emulation into
		dyntrans (but this will take quite some time to get right).
		Generalizing quick_pc_to_pointers.
20051201	Documentation update (David Muse has made available a kernel
		which simplifies Debian/DECstation installation).
		Continuing on the ADB bus controller.
20051202	Beginning a rewrite of the Zilog serial controller (dev_zs).
20051203	Continuing on the zs rewrite (now called dev_z8530); conversion
		to devinit style.
		Reworking some of the input-only vs output-only vs input-output
		details of src/console.c, better warning messages, and adding
		a debug dump.
		Removing the concept of "device state"; it wasn't really used.
		Changing some debug output (-vv should now be used to show all
		details about devices and busses; not shown during normal
		startup anymore).
		Beginning on some SPARC instruction disassembly support.
20051204	Minor PPC updates (WALNUT skeleton stuff).
		Continuing on the MIPS dyntrans rewrite.
		More progress on the ADB controller (a keyboard is "detected"
		by NetBSD and OpenBSD).
		Downgrading OpenBSD/arc as a guest OS from "working" to
		"almost working" in the documentation.
		Progress on Algor emulation ("v3" PCI controller).
20051205	Minor updates.
20051207	Sorting devices according to address; this reduces complexity
		of device lookups from O(n) to O(log n) in memory_rw (but no
		real performance increase (yet) in experiments).
20051210	Beginning the work on native dyntrans backends (by making a
		simple skeleton; so far only for Alpha hosts).
20051211	Some very minor SPARC updates.
20051215	Fixing a bug in the MIPS mul (note: not mult) instruction,
		so it also works with non-64-bit emulation. (Thanks to Alec
		Voropay for noticing the problem.)
20051216	More work on the fake/empty/simple/skeleton/whatever backend;
		performance doesn't increase, so this isn't really worth it,
		but it was probably worth it to prepare for a real backend
		later.
20051219	More instr call statistics gathering and analysis stuff.
20051220	Another fix for MIPS 'mul'. Also converting mul and {d,}cl{o,z}
		to dyntrans.
		memory_ppc.c syntax error fix (noticed by Peter Valchev).
		Beginning to move out machines from src/machine.c into
		individual files in src/machines (in a way similar to the
		autodev system for devices).
20051222	Updating the documentation regarding NetBSD/pmax 3.0.
20051223	- " - NetBSD/cats 3.0.
20051225	- " - NetBSD/hpcmips 3.0.
20051226	Continuing on the machine registry redesign.
		Adding support for ARM rrx (33-bit rotate).
		Fixing some signed/unsigned issues (exposed by gcc -W).
20051227	Fixing the bug which prevented a NetBSD/prep 3.0 install kernel
		from starting (triggered when an mtmsr was the last instruction
		on a page). Unfortunately not enough to get the kernel to run
		as well as the 2.1 kernels did.
20051230	Some dyntrans refactoring.
20051231	Continuing on the machine registry redesign.
20060101-10	Continuing... moving more machines. Moving MD interrupt stuff
		from machine.c into a new src/machines/interrupts.c.
20060114	Adding various mvmeppc machine skeletons.
20060115	Continuing on mvme* stuff. NetBSD/mvmeppc prints boot messages
		(for MVME1600) and reaches the root device prompt, but no
		specific hardware devices are emulated yet.
20060116	Minor updates to the mvme1600 emulation mode; the Eagle PCI bus
		seems to work without much modification, and a 21143 can be
		detected, interrupts might work (but untested so far).
		Adding a fake MK48Txx (mkclock) device, for NetBSD/mvmeppc.
20060121	Adding an aux control register for ARM. (A BIG thank you to
		Olivier Houchard for tracking down this bug.)
20060122	Adding more ARM instructions (smulXY), and dev_iq80321_7seg.
20060124	Adding disassembly of more ARM instructions (mia*, mra/mar),
		and some semi-bogus XScale and i80321 registers.
20060201-02	Various minor updates. Moving the last machines out of
		machine.c.
20060204	Adding a -c command line option, for running debugger commands
		before the simulation starts, but after all files have been
		loaded.
		Minor iq80321-related updates.
20060209	Minor hacks (DEVINIT macro, etc).
		Preparing for the generalization of the 64-bit dyntrans address
		translation subsystem.
20060216	Adding ARM ldrd (double-register load).
20060217	Continuing on various ARM-related stuff.
20060218	More progress on the ATA/wdc emulation for NetBSD/iq80321.
		NetBSD/evbarm can now be installed :-)  Updating the docs, etc.
		Continuing on Algor emulation.

==============  RELEASE 0.3.8  ==============


1 dpavlin 22 $Id: TODO,v 1.209 2006/02/18 21:03:09 debug Exp $
2 dpavlin 2
3 dpavlin 22 Hm. This file is in random order, and not all parts of it are up-to-date.
4 dpavlin 20
5 dpavlin 22 Algor: PCI and ISA and LOCAL interrupts! --> wdc could start working
6     Add interrupt controller in dev_algor.c.
7 dpavlin 2
8 dpavlin 14 Dyntrans:
9 dpavlin 22 TOP Priority:
10     x) 64-bit stuff: good generic virtual memory translation, and
11     other structures. not all 64 bits need to be used
12     (e.g. Alpha)
13     x) Delay slots!
14     x) Old MIPS -> dyntrans!
15     Other stuff:
16     x) INVALIDATION should cause translations in _all_ cpus to be
17     invalidated, e.g. on a write to a write-protected page
18     (containing code)
19     x) Think about sharing code between CPUs of the same
20     arch/bitlength/endianness (the translation caches).
21     (Eg. a little-endian R4000 and a little-endian R5000 could
22     share code, but not an R3000 and an R4000.)
23     x) better (meaningful) instr call statistics
24     x) Call/return hints?
25     x) 16-bit encodings? (MIPS16, ARM Thumb, SH3, ...)
26     x) PPC optimizations; instr combs
27     x) Alpha
28     x) SPARC
29     x) PPC (64-bit stuff)
30 dpavlin 18 x) Lots of other stuff: see src/cpus/README_DYNTRANS
31 dpavlin 22 x) true recompilation backend? think carefully about this,
32     experiment in a separate project (not in GXemul)
33 dpavlin 18
34 dpavlin 22 More generic out_of_memory error reporting, and check everywhere!
35     Causes: OpenBSD has low default limits for normal users.
36     Host is 32-bit? (32-bit hosts are limited to 4 GB or less
37     of userspace memory.)
38     You are actually low on RAM. (As trivial as this might sound,
39     Unix systems usually allow processes to allocate virtual
40     memory beyond the amount of RAM in the machine.)
41    
42     Breakpoints: 32-bit vs 64-bit sign extension for MIPS, warnings, etc.
43     Use the debugger's symbolic name stuff. (which will have to be
44     extended soon to support stuff like "2*x + symbol + y" etc. cool
45     stuff)
46    
47     Sprite (guest OS for DECstation emulation)
48     x) Timing problems during bootup?
49    
50     The Device subsystem:
51     x) allow devices to be moved and/or changed in size (down to a
52     minimum size, etc, or up to a max size)
53     x) keep track of interrupts and busses? actually, allowing any device
54     to be a bus might be a nice idea
55     x) refactor various clocks/nvram/cmos into one device?
56    
57     ARM:
58     o) add ID for "i80321 600MHz rev 2 (XScale core)"
59     o) make the ata controller usable for FreeBSD!
60     x) zaurus for openbsd...
61    
62     PCI:
63     x) add support for address fixups
64     x) generalize the interrupt routing stuff (lines etc). this should
65     be per machine? or per bus, that's better
66    
67     MacPPC:
68     x) dev_zs / interrupts?
69     x) adb controller; keyboard
70     x) make OpenBSD/macppc work (PCI controller stuff)
71    
72     Network layer:
73     o) DHCP (for Debian and BSD installers :-)
74     o) increase performance
75     o) don't rely on NetBSD-ish usage
76     o) Multiple networks per emulation, and let different
77     NICs in machines connect to different networks.
78     o) many other issues: see src/net.c
79    
80     Busses:
81     o) Redesign the entire "mainbus" concept!
82     o) Busses should be placed in a hierarchical tree!
83     o) Easily configurable interrupt routing in SMP systems.
84     o) Specific clock/bus speeds, cpu speeds etc.
85     o) Synchronization over network? or at least in dyntrans within
86     one emulated machine
87     o) dev->bus: TurboChannel, PCMCIA, ADB?
88    
89     Config file parser:
90     o) Refresh/rewrite it :)
91     o) Usage of any expression available through the debugger
92     o) Expressions such as "add device" would be nice to be able
93     to do on the command line manually.
94     o) Allow machine() entries even if there is no emul() entry (but
95     then don't allow any emul() entries at all).
96     o) Support for running debugger commands (like the -c
97     command line option)
98    
99     Floating point layer:
100     o) make it common enough to be used by _all_ emulation modes
101     o) non-IEEE modes (i.e. x86)?
102    
103 dpavlin 14 Userland emulation:
104 dpavlin 22 x) Lots of stuff; freebsd and netbsd (and linux?) syscalls.
105 dpavlin 14 x) Dynamic linking? Hm.
106 dpavlin 12
107 dpavlin 22 Sound:
108     x) generic sound framework
109     x) add one or more sound cards as devices
110 dpavlin 12
111 dpavlin 22 Caches / memory hierarchies: (this is mostly MIPS-specific)
112     o) MIPS coproc.c: bits in config registers should reflect
113     correct cache sizes for _all_ CPU types. (currently only
114     implemented for R4000, R1x000, and a few others)
115     o) src/memory*.c: Implement correct cache emulation for
116     all CPU types. (currently only R2000/R3000 is implemented)
117     (per CPU, multiple levels should be possible,
118     associativity etc!)
119     o) R2000/R3000 isn't _100%_ correct, just almost correct :)
120     o) Move the -S (fill mem with random) functionality into the
121     memory.c subsystem, not machine.c or wherever it is now
122     o) ECC stuff, simulation of memory errors? (Machine dependent)
123     o) More than 4GB of emulated RAM, when run on a 32-bit host?
124     (using manual swap-out of blocks to disk, ugly)
125     o) A global command line option should be used to turn
126     cache emulation on or off. When off, caches should be
127     faked like they are right now. When on, caches and
128     memory latencies should be emulated as correctly as
129     possible.
130 dpavlin 2
131 dpavlin 22 MIPS CPU emulation: (note: this is for the OLD mips stuff)
132     o) i386 bintrans backend: movn etc, slt[u] for
133     64-bit mode, 64-bit shifts etc
134     o) Instructions:
135     o) All ISAs:
136     o) Floating point exception handling, and
137     add more instructions.
138     o) Finish the MIPS16 translator, and test it!
139     o) MIPS ISA I, II, III, IV
140     o) MIPS V (SIMD vector stuff?)
141     o) MDMX (MIPS Digital Media Extension)
142     o) MIPS 3D
143     o) MIPS MT (Multi-thread stuff) (What's this?)
144     o) Warn about mis-used bit fields (ie bits that
145     should be all zeroes, warn about if they are not)!
146     Both for coprocessor registers and for instruction
147     opcodes.
148     o) the special2 stuff is a mess right now
149     o) warn and/or cause exceptions for unimplemented
150     instructions (depending on CPU type)
151     o) R2000/R3000:
152     x) R3000 "tri-byte stores". (What's this?)
153     o) R4000 and others:
154     x) watchhi/watchlo exceptions, and other exception
155     handling details
156     o) R10000 and others: (R12000, R14000 ?)
157     x) memory space, exceptions, ...
158     x) use cop0 framemask for tlb lookups
159     (http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/hdwr/bks/SGI_Developer/books/R10K_UM/sgi_html/t5.Ver.2.0.book_284.html)
160     o) Implement load delays? Warnings on interlocks.
161     o) Implement all coprocessor 0 bits / functions.
162     x) coproc 0 selectors! (R4000 ?)
163     o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird
164     TLB/cache? 128-bit GPRs, new instructions),
165     4K (note: NOT R4000), 5K (note: NOT R5000),
166     R6000 (ISA II), R8000
167     o) Multi-cpu stuff:
168     +) Interrupt routing (ie devices vs mainbus, or
169     connect each device to a fixed cpu)
170     +) SGI's NUMA architecture. Study
171     x) Linux sources
172     x) SGI's specs on NUMA address space
173     +) Ultrix? NetBSD doesn't do SMP on MIPS yet :-(
174     +) Own experiments with ycx2.
175 dpavlin 2
176 dpavlin 22 File/disk/symbol handling:
177     o) Better handling of tape files
178     o) Read function argument count and types from binaries? (ELF?)
179     o) Demangle C++ names.
180 dpavlin 2
181 dpavlin 22 Debugger:
182     o) see src/debugger.c for more
183 dpavlin 2
184 dpavlin 22 Userland ABI emulation:
185     o) see src/useremul.c
186 dpavlin 12
187 dpavlin 22 Terminal/console:
188     o) allow emulated serial ports to be connected to the outside
189     world in a more generic way, or even to other emulated
190     machines(?)
191 dpavlin 2
192 dpavlin 22 Save state of the whole emulated machine, to be able to load it back
193     in later? (Memory, all device's states, all registers and
194     so on. Like taking a snapshot. (SimOS seems to do this,
195     according to its website.))
196 dpavlin 6
197 dpavlin 22 Better framebuffer and X-windows functionality:
198     o) -Yx sometimes causes crashes.
199     o) Simple device access to framebuffer_blockcopyfill() etc,
200     and text output (using the built-in fonts), for dev_fb.
201     o) CLEAN UP the ugly event code
202     o) Mouse clicks can be "missed" in the current system; this is
203     not good. They should be put on a stack of some kind.
204     o) More 2D and 3D framebuffer acceleration.
205     o) Non-resizable windows? Or choose scaledown depending
206     on size (and center the image, with a black border).
207     o) Different scaledown on different windows?
208     o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
209     o) Keyboard and mouse events:
210     x) Do this for more machines than just DECstation
211     x) more X11 cursor keycodes
212     x) Keys like CTRL, ALT, SHIFT do not get through
213     by themselves (these are necessary for example
214     to change the font of an xterm in X in the
215     emulator)
216     o) Generalize the framebuffer stuff by moving _ALL_ X11
217     specific code to src/x11.c!
218 dpavlin 2
219 dpavlin 22 Statistics: (this could be interesting)
220     o) Save to file and show graphics. It should be possible to
221     run gxemul after a simulation to just show the graphics,
222     or convert to a .ppm or .tga or similar.
223     o) memory accesses (to measure cache efficiency and
224     page coloring efficiency)
225     o) nr of simultaneous ASIDs in use in the TLB, for MIPS
226     o) percentage of time spent in different "states", such as
227     running userland code, kernel code, or idling (for CPUs
228     that have such an instruction, or whenever the PC is
229     inside a specific idle-function (address range)).
230     Possible additional state (for example on R3000): caches
231     disabled.
232     o) position of read/write on (SCSI) disks
233 dpavlin 2

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