2001-09-15 07:06:05 +04:00
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<HTML>
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2001-09-15 07:01:35 +04:00
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2001-09-15 07:06:05 +04:00
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<HEAD>
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<TITLE>I/O Interface to Bochs Debugger</TITLE>
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</HEAD>
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<BODY TEXT="#000000" BGCOLOR="#ececec" LINK="#3333cc" VLINK="#666666">
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<CENTER><H1>I/O Interface to Bochs Debugger</H1></CENTER>
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This device was added by Dave Poirier (eks@void-core.2y.net).
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2001-09-15 07:01:35 +04:00
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<p>
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<b>Compiling bochs with support</b>
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<blockquote>
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<pre>
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./configure --enable-iodebug
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make
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</pre>
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Other optional fields may be added to the <cite>./configure</cite> line, see
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bochs documentations for all the informations.
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</blockquote>
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<p>
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<b>Using the I/O Interface to the debugger</b>
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<blockquote>
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<pre>
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port range: 0x8A00 - 0x8A02
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</pre>
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<p>
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Port <b>0x8A00</b> servers as command register. You can use it to enable the
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i/o interface, change which data register is active, etc.
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<p>
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Port <b>0x8A01</b> is used as data register for the memory monitoring.
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<p>
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Port <b>0x8A02</b> is used as data register for breakpoints/watchpoints.
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</blockquote>
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<p>
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<b>Commands supported by the 0x8A00 port</b>
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<blockquote>
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<i>note: all accesses must be done using word</i><br>
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<i>note2: reading this register will return 0x8A00 if currently activated, otherwise 0</i>
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<pre>0x8A00</pre>
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<p>
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Used to enable the device. Any I/O to the debug module before this command is
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sent is sent will simply be ignored.
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<p>
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<pre>0x8A01</pre>
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<p>
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Selects register 0: Memory monitoring range start address (inclusive)
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<p>
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<pre>0x8A02</pre>
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<p>
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Selects register 1: Memory monitoring range end address (exclusive)
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<p>
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<pre>0x8A80</pre>
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<p>
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Enable address range memory monitoring as indicated by register 0 and 1 and clears both registers
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<p>
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<pre>0x8AFF</pre>
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<p>
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Disable the I/O interface to the debugger and the memory monitoring functions.
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</blockquote>
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<p>
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<b>Access to port 0x8A01</b>
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<blockquote>
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<i>(write-only)</i>
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<p>
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All accesses to this port must be done using words. Writing to this port will
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shift to the left by 16 the current value of the register and add the provided
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value to it.
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<pre>
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i.e: reg0 = 0x01234567
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out port: 0x8A01 data: 0xABCD
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reg0 = 0x4567ABCD
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</pre>
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</body></html>
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