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revision 24 by dpavlin, Mon Oct 8 16:19:56 2007 UTC revision 42 by dpavlin, Mon Oct 8 16:22:32 2007 UTC
# Line 10  Line 10 
10    
11  <!--  <!--
12    
13  $Id: experiments.html,v 1.102 2006/06/12 10:21:12 debug Exp $  $Id: experiments.html,v 1.110 2007/06/15 18:07:08 debug Exp $
14    
15  Copyright (C) 2003-2006  Anders Gavare.  All rights reserved.  Copyright (C) 2003-2007  Anders Gavare.  All rights reserved.
16    
17  Redistribution and use in source and binary forms, with or without  Redistribution and use in source and binary forms, with or without
18  modification, are permitted provided that the following conditions are met:  modification, are permitted provided that the following conditions are met:
# Line 65  that you do two things: Line 65  that you do two things:
65    
66  <p>  <p>
67  <ul>  <ul>
68    <li>Build and install a cross-compiler for your chosen target.    <li>Build and install a cross-compiler for your chosen target,
69            e.g. <tt>mips64-unknown-elf</tt>.
70          GCC is usually a good compiler choice, because it is portable          GCC is usually a good compiler choice, because it is portable
71          and in wide-spread use. (Other compilers should work too.)          and in wide-spread use. (Other compilers should work too.)
72    
# Line 231  following experimental devices: Line 232  following experimental devices:
232            <tr>            <tr>
233              <td align="left" valign="top"><tt>0x00d0</tt></td>              <td align="left" valign="top"><tt>0x00d0</tt></td>
234              <td align="left" valign="top">Read: <b><tt>ncycles()</tt></b>.              <td align="left" valign="top">Read: <b><tt>ncycles()</tt></b>.
235                  Returns approximately the number of cycles executed.                  Returns approximately the number of cycles executed on
236                  Note: this value is not updated for every instruction,                  this CPU. Note: this value is not updated for every instruction,
237                  so it cannot be used for small measurements.</td>                  so it cannot be used for small measurements.</td>
238            </tr>            </tr>
239          </table>          </table>
# Line 367  following experimental devices: Line 368  following experimental devices:
368      </td>      </td>
369    </tr>    </tr>
370    
371      <tr height="15">
372        <td height="15">&nbsp;</td>
373      </tr>
374    
375      <tr>
376        <td align="left" valign="top">
377            <a name="expdevices_rtc"><b><tt>rtc</tt>:</b></a>
378            <p>A Real-Time Clock, used to retrieve the current time
379            and to cause periodic interrupts.
380            <p>Source code:&nbsp;&nbsp;<font color="#0000f0"><tt>src/devices/dev_rtc.c</tt></font>
381            <p>Include file:&nbsp;&nbsp;<font color="#0000f0"><tt>dev_rtc.h</tt></font>
382            <br>Default physical address:&nbsp&nbsp;<font color="#0000f0">0x15000000</font>
383        </td>
384        <td></td>
385        <td align="left" valign="top">
386            <table border="0">
387              <tr>
388                <td align="left" valign="top"><i><u>Offset:</u></i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
389                <td align="left" valign="top"><i><u>Effect:</u></i></td>
390              </tr>
391              <tr>
392                <td align="left" valign="top"><tt>0x0000</tt></td>
393                <td align="left" valign="top">Read or Write: Trigger a clock update (a gettimeofday() on the host).</td>
394              </tr>
395              <tr>
396                <td align="left" valign="top"><tt>0x0010</tt></td>
397                <td align="left" valign="top">Read: Seconds since 1st January 1970</td>
398              </tr>
399              <tr>
400                <td align="left" valign="top"><tt>0x0020</tt></td>
401                <td align="left" valign="top">Read: Microseconds</td>
402              </tr>
403              <tr>
404                <td align="left" valign="top"><tt>0x0100</tt></td>
405                <td align="left" valign="top">Read: Get the current
406                    timer interrupt frequency.<br>Write: Set the timer
407                    interrupt frequency. (Writing 0 disables the timer.)</td>
408              </tr>
409              <tr>
410                <td align="left" valign="top"><tt>0x0110</tt></td>
411                <td align="left" valign="top">Read or Write: Acknowledge
412                    one timer interrupt. (Note that if multiple interrupts
413                    are pending, only one is acknowledged.)</td>
414              </tr>
415            </table>
416        </td>
417      </tr>
418    
419      <tr height="15">
420        <td height="15">&nbsp;</td>
421      </tr>
422    
423      <tr>
424        <td align="left" valign="top">
425            <a name="expdevices_irqc"><b><tt>irqc</tt>:</b></a>
426            <p>An Interrupt Controller. (Note: Not used for the MIPS test machine.)
427            <p>Source code:&nbsp;&nbsp;<font color="#0000f0"><tt>src/devices/dev_irqc.c</tt></font>
428            <p>Include file:&nbsp;&nbsp;<font color="#0000f0"><tt>dev_irqc.h</tt></font>
429            <br>Default physical address:&nbsp&nbsp;<font color="#0000f0">0x16000000</font>
430        </td>
431        <td></td>
432        <td align="left" valign="top">
433            <table border="0">
434              <tr>
435                <td align="left" valign="top"><i><u>Offset:</u></i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>
436                <td align="left" valign="top"><i><u>Effect:</u></i></td>
437              </tr>
438              <tr>
439                <td align="left" valign="top"><tt>0x0</tt></td>
440                <td align="left" valign="top">Read: IRQ status as a 32-bit word, one bit per interrupt source.</td>
441              </tr>
442              <tr>
443                <td align="left" valign="top"><tt>0x4</tt></td>
444                <td align="left" valign="top">Write: Mask one interrupt source. Value should be an integer 0..31.</td>
445              </tr>
446              <tr>
447                <td align="left" valign="top"><tt>0x8</tt></td>
448                <td align="left" valign="top">Write: Unmask one interrupt source. Value should be an integer 0..31.</td>
449              </tr>
450            </table>
451        </td>
452      </tr>
453    
454  </table></center>  </table></center>
455    
456  <p>  <p>The include files for the test machine devices are found in
457  While these devices may resemble real-world hardware, they are  <a href="../src/include/testmachine/"><tt>src/include/testmachine/</tt></a>.
458    
459    <p>While these devices may resemble real-world hardware, they are
460  intentionally made simpler to use. (An exception is the framebuffer;  intentionally made simpler to use. (An exception is the framebuffer;
461  some machines actually have simple linear framebuffers like this.)  some machines actually have simple linear framebuffers like this.)
462    
# Line 380  means that it can be accessed at virtual Line 466  means that it can be accessed at virtual
466  <tt>0xffffffff90000000</tt> too, but devices should usually be accessed in  <tt>0xffffffff90000000</tt> too, but devices should usually be accessed in
467  a non-cached manner.)  a non-cached manner.)
468    
469  <p>When using the Alpha, ARM, or PPC test machines, the addresses are  <p>When using the ARM or PPC test machines, the addresses are
470  <tt>0x10000000</tt>, <tt>0x11000000</tt> etc., so no need to add any  <tt>0x10000000</tt>, <tt>0x11000000</tt> etc., so no need to add any
471  virtual displacement.  virtual displacement.
472    
# Line 414  what kind of IPI it was. Line 500  what kind of IPI it was.
500  <p><center>  <p><center>
501  <table border="1">  <table border="1">
502          <tr><td align="center">          <tr><td align="center">
503                  <b><tt>testmips</tt></b>                  <b><tt>testmips</tt></b> (as native MIPS interrupts)
504          </td></tr>          </td></tr>
505          <tr><td>          <tr><td>
506                  <table border="0">                  <table border="0">
# Line 424  what kind of IPI it was. Line 510  what kind of IPI it was.
510                          <td>MIPS count/compare interrupt</td></tr>                          <td>MIPS count/compare interrupt</td></tr>
511                  <tr><td align="center">6</td><td></td>                  <tr><td align="center">6</td><td></td>
512                          <td><tt>mp</tt> (inter-processor interrupts)</td></tr>                          <td><tt>mp</tt> (inter-processor interrupts)</td></tr>
513                    <tr><td align="center">4</td><td></td>
514                            <td><tt>rtc</tt></td></tr>
515                    <tr><td align="center">3</td><td></td>
516                            <td><tt>ether</tt></td></tr>
517                    <tr><td align="center">2</td><td></td>
518                            <td><tt>cons</tt></td></tr>
519                    </table>
520            </td></tr>
521    </table>
522    
523    <p><table border="1">
524            <tr><td align="center">
525                    <b><tt>testarm</tt> and others</b> (via the <tt>irqc</tt> device)
526            </td></tr>
527            <tr><td>
528                    <table border="0">
529                    <tr><td align="center">IRQ:</td><td>&nbsp;</td>
530                            <td>Used for:</td></tr>
531                    <tr><td align="center">6</td><td></td>
532                            <td><tt>mp</tt> (inter-processor interrupts)</td></tr>
533                    <tr><td align="center">4</td><td></td>
534                            <td><tt>rtc</tt></td></tr>
535                  <tr><td align="center">3</td><td></td>                  <tr><td align="center">3</td><td></td>
536                          <td><tt>ether</tt></td></tr>                          <td><tt>ether</tt></td></tr>
537                  <tr><td align="center">2</td><td></td>                  <tr><td align="center">2</td><td></td>
# Line 433  what kind of IPI it was. Line 541  what kind of IPI it was.
541  </table>  </table>
542  </center>  </center>
543    
 <p>Other machines:  TODO  
544    
545    
546  <p><br>  <p><br>
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