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 26 - (hide annotations)
Mon Oct 8 16:20:10 2007 UTC (13 years, 3 months ago) by dpavlin
File size: 3277 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1264 2006/06/25 11:08:04 debug Exp $
20060624	Replacing the error-prone machine type initialization stuff
		with something more reasonable.
		Finally removing the old "cpu_run" kludge; moving around stuff
		in machine.c and emul.c to better suit the dyntrans system.
		Various minor dyntrans cleanups (renaming translate_address to
		translate_v2p, and experimenting with template physpages).
20060625	Removing the speed hack which separated the vph entries into
		two halves (code vs data); things seem a lot more stable now.
		Minor performance hack: R2000/R3000 cache isolation now only
		clears address translations when going into isolation, not
		when going out of it.
		Fixing the MIPS interrupt problems by letting mtc0 immediately
		cause interrupts.

==============  RELEASE  ==============

1 dpavlin 26 Gavare's eXperimental Emulator -- GXemul
2     ====================================================
3 dpavlin 2
4 dpavlin 22 Copyright (C) 2003-2006 Anders Gavare.
5 dpavlin 2
7 dpavlin 24 Overview -- What is GXemul?
8     -----------------------------
9 dpavlin 2
10 dpavlin 14 GXemul is an experimental instruction-level machine emulator. Several
11     emulation modes are available. In some modes, processors and surrounding
12 dpavlin 12 hardware components are emulated well enough to let unmodified operating
13     systems (e.g. NetBSD) run as if they were running on a real machine.
14 dpavlin 2
15 dpavlin 24 Processors (ARM, MIPS, PowerPC) are emulated using a kind of dynamic
16     translation system. Performance is somewhere between traditional
17     interpretation and recompilation into native code. However, the dynamic
18     translation system used in GXemul does not (currently) generate native
19     code, and thus does not require platform-specific back-ends. In plain
20     English, this means that the dyntrans system works on any host platform.
21 dpavlin 2
22 dpavlin 24 Possible uses of the emulator include:
23 dpavlin 12
24 dpavlin 24 o) educational purposes, e.g. to learn how to write code for MIPS
25 dpavlin 20
26 dpavlin 24 o) hobby operating system development; the emulator can be used as a
27     complement to testing your code on real hardware
29     o) running guest operating systems in a "sandboxed" environment
31     o) compiling your source code inside a guest operating system which you
32     otherwise would not have access to (e.g. various exotic ports of
33     NetBSD), to make sure that your source code is portable to those
34     platforms
36     o) simulating (ethernet) networks of computers running various
37     operating systems, to study their interaction with each other
39     o) debugging code in general
41     Use your imagination :-)
44     GXemul's limitations
45     --------------------
47     o) GXemul is not (in general) a cycle-accurate simulator, because it does
48     not simulate things smaller than an instruction. Pipe-line stalls,
49     instruction latency effects etc. are more or less completely ignored.
51     o) Hardware devices have been implemented in an ad-hoc and as-needed
52     manner, usually only enough to fool certain guest operating systems
53     (e.g. NetBSD) that the hardware devices exist and function well
54     enough for those guest operating systems to use them.
56     A consequence of this is that a machine mode may be implemented well
57     enough to run NetBSD for that machine mode, but other guest operating
58     systems may not run at all, or behave strangely.
61 dpavlin 2 Quick start
62     -----------
64 dpavlin 4 To compile, type './configure' and then 'make'. This should work on most
65     Unix-like systems. If not, then please mail me a bug report.
66 dpavlin 2
67 dpavlin 24 You might want to experiment with various CC and CFLAGS environment
68     variable settings, to get optimum performance.
70 dpavlin 10 If you are impatient, and want to try out running a guest operating system
71 dpavlin 22 inside GXemul, read this: doc/guestoses.html#netbsdcatsinstall
72 dpavlin 2
73 dpavlin 10 If you want to use GXemul for experimenting with code of your own,
74     then I suggest you compile a Hello World program according to the tips
75     listed here: doc/experiments.html#hello
76 dpavlin 2
77 dpavlin 10 Please read the rest of the documentation in the doc/ sub-directory for
78     more detailed information on how to use the emulator.
81 dpavlin 2 Feedback
82     --------
84     If you have found GXemul useful in some way, or feel like sending me
85     comments or feedback in general, then mail me at anders(at)gavare.se.

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