/[gxemul]/trunk/TODO
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Revision 18 - (hide annotations)
Mon Oct 8 16:19:11 2007 UTC (13 years ago) by dpavlin
File size: 6257 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1004 2005/10/27 14:01:10 debug Exp $
20051011        Passing -A as the default boot arg for CATS (works fine with
                OpenBSD/cats).
20051012	Fixing the VGA cursor offset bug, and speeding up framebuffer
		redraws if character cells contain the same thing as during
		the last redraw.
20051013	Adding a slow strd ARM instruction hack.
20051017	Minor updates: Adding a dummy i80321 Verde controller (for
		XScale emulation), fixing the disassembly of the ARM "ldrd"
		instruction, adding "support" for less-than-4KB pages for ARM
		(by not adding them to translation tables).
20051020	Continuing on some HPCarm stuff. A NetBSD/hpcarm kernel prints
		some boot messages on an emulated Jornada 720.
		Making dev_ram work better with dyntrans (speeds up some things
		quite a bit).
20051021	Automatically generating some of the most common ARM load/store
		multiple instructions.
20051022	Better statistics gathering for the ARM load/store multiple.
		Various other dyntrans and device updates.
20051023	Various minor updates.
20051024	Continuing; minor device and dyntrans fine-tuning. Adding the
		first "reasonable" instruction combination hacks for ARM (the
		cores of NetBSD/cats' memset and memcpy).
20051025	Fixing a dyntrans-related bug in dev_vga. Also changing the
		dyntrans low/high access notification to only be updated on
		writes, not reads. Hopefully it will be enough. (dev_vga in
		charcell mode now seems to work correctly with both reads and
		writes.)
		Experimenting with gathering dyntrans statistics (which parts
		of emulated RAM that are actually executed), and adding
		instruction combination hacks for cache cleaning and a part of
		NetBSD's scanc() function.
20051026	Adding a bitmap for ARM emulation which indicates if a page is
		(specifically) user accessible; loads and stores with the t-
		flag set can now use the translation arrays, which results in
		a measurable speedup.
20051027	Dyntrans updates; adding an extra bitmap array for 32-bit
		emulation modes, speeding up the check whether a physical page
		has any code translations or not (O(n) -> O(1)). Doing a
		similar reduction of O(n) to O(1) by avoiding the scan through
		the translation entries on a translation update (32-bit mode
		only).
		Various other minor hacks.
20051029	Quick release, without any testing at all.

==============  RELEASE 0.3.6.2  ==============


1 dpavlin 18 $Id: TODO,v 1.175 2005/10/23 14:24:09 debug Exp $
2 dpavlin 2
3 dpavlin 12 ===============================================================================
4 dpavlin 2
5 dpavlin 12 High priority stuff:
6    
7    
8 dpavlin 14 Old MIPS bintrans:
9    
10 dpavlin 12 x) call/return address cache?
11    
12 dpavlin 14 x) Turn the MIPS cpu family stuff into dyntrans.
13 dpavlin 12
14    
15 dpavlin 14 Dyntrans:
16 dpavlin 12
17 dpavlin 18 x) Separate data and instruction translations?
18 dpavlin 12
19 dpavlin 18 x) Generalize the inline quick_pc_to_pointers?
20 dpavlin 12
21 dpavlin 18 x) Call/return hints...
22    
23     x) More 64-bit stuff.
24    
25     x) Lots of other stuff: see src/cpus/README_DYNTRANS
26    
27    
28 dpavlin 14 Userland emulation:
29 dpavlin 12
30 dpavlin 14 x) Lots of stuff.
31 dpavlin 12
32 dpavlin 14 x) Dynamic linking? Hm.
33 dpavlin 12
34     ===============================================================================
35    
36     Lower priority, but still important:
37    
38     Redesign the entire "mainbus" concept:
39     o) Easily configurable interrupt routing in SMP systems.
40     o) Specific clock/bus speeds, cpu speeds etc.
41     o) Synchronization over network?
42    
43 dpavlin 2 Caches / memory hierarchies: (this is mostly MIPS-specific)
44     o) MIPS coproc.c: bits in config registers should reflect
45     correct cache sizes for _all_ CPU types. (currently only
46     implemented for R4000, R1x000, and a few others)
47     o) src/memory*.c: Implement correct cache emulation for
48     all CPU types. (currently only R2000/R3000 is implemented)
49     (per CPU, multiple levels should be possible,
50     associativity etc!)
51     o) R2000/R3000 isn't _100%_ correct, just almost correct :)
52     o) Move the -S (fill mem with random) functionality into the
53     memory.c subsystem, not machine.c or wherever it is now
54     o) ECC stuff, simulation of memory errors? (Machine dependant)
55     o) More than 4GB of emulated RAM, when run on a 32-bit host?
56     (using manual swap-out of blocks to disk, ugly)
57     o) A global command line option should be used to turn
58     cache emulation on or off. When off, caches should be
59     faked like they are right now. When on, caches and
60     memory latencies should be emulated as correctly as
61     possible.
62    
63     Network layer:
64     o) Multiple networks per emulation, and let different
65     NICs in machines connect to different networks.
66     o) many other issues: see src/net.c
67    
68     MIPS CPU emulation:
69 dpavlin 12 o) i386 bintrans backend: movn etc, slt[u] for
70     64-bit mode, 64-bit shifts etc
71 dpavlin 2 o) Instructions:
72 dpavlin 12 o) All ISAs:
73 dpavlin 2 o) Floating point exception handling, and
74     add more instructions.
75     o) Finish the MIPS16 translator, and test it!
76     o) MIPS ISA I, II, III, IV
77     o) MIPS V (SIMD vector stuff?)
78     o) MDMX (MIPS Digital Media Extension)
79     o) MIPS 3D
80     o) MIPS MT (Multi-thread stuff) (What's this?)
81     o) Warn about mis-used bit fields (ie bits that
82     should be all zeroes, warn about if they are not)!
83     Both for coprocessor registers and for instruction
84     opcodes.
85     o) the special2 stuff is a mess right now
86     o) warn and/or cause exceptions for unimplemented
87     instructions (depending on CPU type)
88     o) R2000/R3000:
89     x) R3000 "tri-byte stores". (What's this?)
90     o) R4000 and others:
91     x) watchhi/watchlo exceptions, and other exception
92     handling details
93     o) R10000 and others: (R12000, R14000 ?)
94     x) memory space, exceptions, ...
95     x) use cop0 framemask for tlb lookups
96     (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)
97     o) Implement load delays? Warnings on interlocks.
98     o) Implement all coprocessor 0 bits / functions.
99     x) coproc 0 selectors! (R4000 ?)
100     o) R4300 (nintendo64, no mmu?), R5900 (playstation2, weird
101     TLB/cache? 128-bit GPRs, new instructions),
102     4K (note: NOT R4000), 5K (note: NOT R5000),
103     R6000 (ISA II), R8000
104     o) Multi-cpu stuff:
105 dpavlin 12 +) Interrupt routing (ie devices vs mainbus, or
106     connect each device to a fixed cpu)
107 dpavlin 2 +) SGI's NUMA architecture. Study
108     x) Linux sources
109     x) SGI's specs on NUMA address space
110     +) Ultrix? NetBSD doesn't do SMP on MIPS yet :-(
111     +) Own experiments with ycx2.
112    
113     File/disk handling:
114     o) Better handling of tape files
115    
116 dpavlin 12 Debugger:
117     o) Read function argument count and types from binaries? (ELF?)
118     o) Demangle C++ names.
119 dpavlin 14 o) see src/debugger.c for more stuff
120 dpavlin 12
121 dpavlin 2 Userland ABI emulation:
122     o) see src/useremul.c
123    
124 dpavlin 6 Terminal/console stuff:
125     o) allow emulated serial ports to be connected to the outside
126     world in a more generic way, or even to other emulated
127     machines(!)
128    
129 dpavlin 12 Regression tests. (Needs to be totally rewritten, the old framework
130     was removed because it was useless.)
131 dpavlin 2
132     Save state of the whole emulated machine, to be able to load it back
133     in later? (Memory, all device's states, all registers and
134     so on. Like taking a snapshot. (SimOS seems to do this,
135     according to its website.))
136    
137     Better X-windows functionality:
138     o) CLEAN UP the ugly event code
139     o) Mouse clicks can be "missed" in the current system; this is
140     not good. They should be put on a stack of some kind.
141     o) More 2D and 3D framebuffer acceleration.
142     o) Non-resizable windows? Or choose scaledown depending
143     on size (and center the image, with a black border).
144     o) Different scaledown on different windows?
145     o) Switch scaledown during runtime? (Ala CTRL-ALT-plus/minus)
146     o) Keyboard and mouse events:
147     x) Do this for more machines than just DECstation
148     x) more X11 cursor keycodes
149     x) Keys like CTRL, ALT, SHIFT do not get through
150     by themselves (these are necessary for example
151     to change the font of an xterm in X in the
152     emulator)
153     o) Generalize the framebuffer stuff by moving _ALL_ X11
154     specific code to src/x11.c!
155    
156     Statistics: (this could be interesting)
157     o) Save to file and show graphics. It should be possible to
158     run gxemul after a simulation to just show the graphics,
159     or convert to a .ppm or .tga or similar.
160     o) memory accesses (to measure cache efficiency and
161     page coloring efficiency)
162     o) nr of simultaneous ASIDs in use in the TLB, for MIPS
163     o) percentage of time spent in different "states", such as
164     running userland code, kernel code, or idling (for CPUs
165     that have such an instruction, or whenever the PC is
166     inside a specific idle-function (address range)).
167     Possible additional state (for example on R3000): caches
168     disabled.
169     o) position of read/write on (SCSI) disks
170    

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