/[gxemul]/trunk/doc/intro.html

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 19 by dpavlin,
Mon Oct  8 16:18:51 2007 UTC
+revision 20 by dpavlin,
Mon Oct  8 16:19:23 2007 UTC
 Line 10
  <!--
- $Id: intro.html,v 1.64 2005/10/07 22:45:33 debug Exp $
+ $Id: intro.html,v 1.66 2005/11/23 22:03:24 debug Exp $
  Copyright (C) 2003-2005  Anders Gavare.  All rights reserved.
 Line 70 
 hardware components are emulated well en
  systems (e.g. NetBSD) run as if they were running on a real machine.
  <p>The processor architecture best emulated by GXemul is MIPS, but other
- architectures are also partially emulated.
+ architectures such as ARM and PowerPC are also partially emulated.
  <p>Devices and CPUs are not simulated with 100% accuracy. They are only
- ``faked'' well enough to make operating systems (e.g. NetBSD) run without
+ ``faked'' well enough to allow guest operating systems run without
  complaining too much. Still, the emulator could be of interest for
  academic research and experiments, such as when learning how to write
  operating system code.
- <p>The emulator is written in C, does not depend on external libraries
+ <p>The emulator is written in C, does not depend on third-party libraries
  (except X11, but that is optional), and should compile and run on most
- Unix-like systems. If it doesn't, then that is a bug.
+ Unix-like systems.
  <p>The emulator contains code which tries to emulate the workings of CPUs
  and surrounding hardware found in real machines, but it does not contain
 Line 159 
 mail me a bug report.
  <p>The emulator's performance is highly dependent on both runtime settings
  and on compiler settings, so you might want to experiment with different
- CC and CFLAGS environment variable values. For example, on a modern PC,
+ CC and CFLAGS environment variable values. For example, on an AMD Athlon
- you could try the following:
+ host, you might want to try setting <tt>CFLAGS</tt> to <tt>-march=athlon
- <p><pre>
+ -O3</tt> before running <tt>configure</tt>.
-         $ <b>CFLAGS="-mcpu=pentium4 -O3" ./configure</b>
-         $ <b>make</b>
- </pre>
-Line 222 
 their original meaning in those xterm wi
+Line 219 
 their original meaning in those xterm wi
  Emulation of R4000, which is a 64-bit CPU, was my initial goal.
  R2000/R3000-like CPUs (32-bit), R1x000, and generic MIPS32/MIPS64-style
  CPUs are also emulated, and are hopefully almost as stable as the R4000
- emulation.
+ emulation. Several guest operating systems for MIPS can run inside
+ the emulator.
- <p>I have written an experimental dynamic binary translation subsystem.
+ <p>(For MIPS emulation, I have written an experimental dynamic binary
- This gives higher total performance than interpreting one instruction at a
+ translation subsystem, for Alpha and i386 hosts. This gives higher total
- time and executing it. (If you wish to disable bintrans, add <b>-B</b> to
+ performance than interpreting one instruction at a time and executing it.
- the command line.)
+ If you wish to disable bintrans, add <b>-B</b> to the command line.)
  <h4>ARM:</h4>
- The ARM CPU emulation is good enough to run NetBSD/cats and OpenBSD/cats
+ ARM emulation is good enough to run NetBSD/cats 2.1 and OpenBSD/cats 3.8,
- (almost bugfree :-), but it is not as tested or fine-tuned as the MIPS
+ but it is not as tested or fine-tuned as the MIPS emulation mode.
- emulation.
- <h4>Other CPU types:</h4>
+ <h4>PowerPC:</h4>
- Some other CPU architectures can also be partially emulated. These are not
+ PowerPC emulation is still in its beginning stages, but good enough
- working well enough yet to run guest operating systems.
+ to run NetBSD/prep 2.1.
+ <p>Non-MIPS emulation modes use dynamic translation, but not recompilation
+ into native code. This makes it possible to run on any host platform.
-Line 268 
 taking place, and that clock speeds are
+Line 267 
 taking place, and that clock speeds are
  option. (Deterministic in this case does <i>not</i> mean that the
  emulation will be identical to some actual real-world machine.)
+ <p><font color="#ff0000">(Oops/TODO: User interaction means <i>both</i>
+ input to the emulated program/OS, and interacting with the emulator
+ itself. Breaking into the debugger and then continuing execution may
+ affect when/how interrupts occur.)</font>
-Line 284 
 are emulated well enough to run at least
+Line 289 
 are emulated well enough to run at least
    <li><b><u>MIPS</u></b>
    <ul>
      <li><b>DECstation 5000/200</b>&nbsp;&nbsp;("3max")
-         <br>Serial controller (including keyboard and mouse), ethernet,
-         SCSI, and graphical framebuffers.
      <p>
      <li><b>Acer Pica-61</b>&nbsp;&nbsp;(an ARC machine)
-         <br>Serial controller, "VGA" text console, and SCSI.
      <p>
      <li><b>NEC MobilePro 770, 780, 800, and 880</b>&nbsp;&nbsp;(HPCmips machines)
-         <br>Framebuffer, keyboard, and a PCMCIA IDE controller.
      <p>
      <li><b>Cobalt</b>
-         <br>Serial controller and PCI IDE.
      <p>
-     <li><b>Malta (evbmips)</b>
+     <li><b>Malta</b> (evbmips)
-         <br>Serial controller and PCI IDE.
      <p>
      <li><b>SGI O2 ("IP32")</b>
-         <br>Serial controller and ethernet.&nbsp;&nbsp;<small>(Enough for
+         <br><small>(Enough for root-on-nfs, but not for disk boot.)</small>
-         root-on-nfs, but not for disk boot.)</small>
    </ul>
    <p>
    <li><b><u>ARM</u></b>
    <ul>
      <li><b>CATS</b>
-         <br>VGA and PCI IDE.
+   </ul>
+   <p>
+   <li><b><u>PowerPC</u></b>
+   <ul>
+     <li><b>PReP (PowerPC Reference Platform)</b>
    </ul>
  </ul>
-Line 457 
 interacted with similar to a real machin
+Line 459 
 interacted with similar to a real machin
            <td></td>
          </tr>
+         <tr><td height="10"></td></tr>
+         <tr>
+           <td></td>
+           <td align="center"><a href="20051123-netbsd-prep.png"><img src="20051123-netbsd-prep_small.png"></a></td>
+           <td></td>
+           <td><a href="http://www.netbsd.org/Ports/prep/">NetBSD/prep</a>
+                 <br>PReP</td>
+           <td></td>
+         </tr>
  </table></center>

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