/[gxemul]/trunk/README
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 36 - (hide annotations)
Mon Oct 8 16:21:34 2007 UTC (13 years, 3 months ago) by dpavlin
File size: 3329 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1497 2007/03/18 03:41:36 debug Exp $
20070224	Minor update to the initialization of the ns16550 in
		machine_walnut.c, to allow that machine type to boot with the
		new interrupt system (although it is still a dummy machine).
		Adding a wdc at 0x14000000 to machine_landisk.c, and fixing
		the SCIF serial interrupts of the SH4 cpu enough to get
		NetBSD/landisk booting from a disk image :-)  Adding a
		preliminary install instruction skeleton to guestoses.html.
20070306	Adding SH-IPL+G PROM emulation, and also passing the "end"
		symbol in r5 on bootup, for Landisk emulation. This is enough
		to get OpenBSD/landisk to install :)  Adding a preliminary
		install instruction skeleton to the documentation. SuperH
		emulation is still shaky, though :-/
20070307	Fixed a strangeness in memory_sh.c (read/write was never
		returned for any page). (Unknown whether this fixes any actual
		problems, though.)
20070308	dev_ram.c fix: invalidate code translations on writes to
		RAM, emulated as separate devices. Linux/dreamcast gets
		further in the boot process than before, but still bugs out
		in userland.
		Fixing bugs in the "stc.l gbr,@-rN" and "ldc.l @rN+,gbr" SuperH 
		instructions (they should NOT check the MD bit), allowing the
		Linux/dreamcast Live CD to reach userland correctly :-)
20070310	Changing the cpu name "Alpha" in src/useremul.c to "21364" to
		unbreak userland syscall emulation of FreeBSD/Alpha binaries.
20070314	Applying a patch from Michael Yaroslavtsev which fixes the
		previous Linux lib64 patch to the configure script.
20070315	Adding a (dummy) sun4v machine type, and SPARC T1 cpu type.
20070316	Creating a new directory, src/disk, and moving diskimage.c
		to it. Separating out bootblock loading stuff from emul.c into
		new files in src/disk.
		Adding some more SPARC registers.
20070318	Preparing/testing for a minirelease, 0.4.4.1.

==============  RELEASE 0.4.4.1  ==============


1 dpavlin 36 Gavare's eXperimental Emulator -- GXemul 0.4.4.1
2     ====================================================
3 dpavlin 2
4 dpavlin 34 Copyright (C) 2003-2007 Anders Gavare.
5 dpavlin 2
6    
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 34 Processors (ARM, MIPS, PowerPC, SuperH) are emulated using dynamic
16     translation. Unlike some other dynamically translating emulators, GXemul
17     does not need to generate native code, only a "runnable intermediate
18     representation", and will thus run on any host architecture.
19 dpavlin 2
20 dpavlin 34 The documentation lists the machines and guest operating systems that can
21     be regarded as "working" in GXemul. The best working guest operating
22     systems are probably NetBSD/pmax and NetBSD/cats.
23    
24 dpavlin 24 Possible uses of the emulator include:
25 dpavlin 12
26 dpavlin 24 o) educational purposes, e.g. to learn how to write code for MIPS
27 dpavlin 20
28 dpavlin 24 o) hobby operating system development; the emulator can be used as a
29     complement to testing your code on real hardware
30    
31     o) running guest operating systems in a "sandboxed" environment
32    
33     o) compiling your source code inside a guest operating system which you
34     otherwise would not have access to (e.g. various exotic ports of
35     NetBSD), to make sure that your source code is portable to those
36     platforms
37    
38     o) simulating (ethernet) networks of computers running various
39     operating systems, to study their interaction with each other
40    
41     o) debugging code in general
42    
43     Use your imagination :-)
44    
45    
46     GXemul's limitations
47     --------------------
48    
49     o) GXemul is not (in general) a cycle-accurate simulator, because it does
50     not simulate things smaller than an instruction. Pipe-line stalls,
51     instruction latency effects etc. are more or less completely ignored.
52    
53     o) Hardware devices have been implemented in an ad-hoc and as-needed
54     manner, usually only enough to fool certain guest operating systems
55     (e.g. NetBSD) that the hardware devices exist and function well
56     enough for those guest operating systems to use them.
57    
58     A consequence of this is that a machine mode may be implemented well
59     enough to run NetBSD for that machine mode, but other guest operating
60     systems may not run at all, or behave strangely.
61    
62    
63 dpavlin 2 Quick start
64     -----------
65    
66 dpavlin 4 To compile, type './configure' and then 'make'. This should work on most
67 dpavlin 28 Unix-like systems. If it does not, then please mail me a bug report.
68 dpavlin 2
69 dpavlin 24 You might want to experiment with various CC and CFLAGS environment
70     variable settings, to get optimum performance.
71    
72 dpavlin 10 If you are impatient, and want to try out running a guest operating system
73 dpavlin 22 inside GXemul, read this: doc/guestoses.html#netbsdcatsinstall
74 dpavlin 2
75 dpavlin 10 If you want to use GXemul for experimenting with code of your own,
76     then I suggest you compile a Hello World program according to the tips
77     listed here: doc/experiments.html#hello
78 dpavlin 2
79 dpavlin 10 Please read the rest of the documentation in the doc/ sub-directory for
80     more detailed information on how to use the emulator.
81    
82    
83 dpavlin 2 Feedback
84     --------
85    
86     If you have found GXemul useful in some way, or feel like sending me
87     comments or feedback in general, then mail me at anders(at)gavare.se.
88    

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