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oldlinux-files/docs/interrupts/int-html/rb-6264.htm
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<TITLE>Int 4B/AX=8104h
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Int 4B/AX=8104h - Virtual DMA Specification - UNLOCK DMA REGION -
AX = 8104h
DX = flags
bit 0: reserved (zero)
bit 1: data should be copied out of buffer
bits 2-15 reserved (zero)
ES:DI - DMA descriptor structure (see #03221,#03222) with region size,
physical address, and buffer ID fields set
Return: CF clear if successful
DDS physical address field set
DDS buffer ID field set (0000h if no buffer allocated)
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<h2>Int 4B/AX=8104h
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<h3><font color=#C00040>Virtual DMA Specification - UNLOCK DMA REGION</font></h3>
<PRE>
AX = 8104h
DX = flags
<p><b>bit 0:</b><br>Reserved (zero)
<p><b>bit 1:</b><br>Data should be copied out of buffer
bits 2-15 reserved (zero).
ES:DI -> DMA descriptor structure <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #03221,#03222) with region size,
physical address, and buffer ID fields set<br>
<p><b>Return:</b><br>CF clear if successful
DDS physical address field set
DDS buffer ID field set (0000h if no buffer allocated)
CF set on error
AL = error code <a href="rb-6262.htm#Table3218" tppabs="http://www.ctyme.com/intr/rb-6262.htm#Table3218">(see #03218)</a>
DDS region size field filled wth maximum contiguous length in bytes
</PRE>
<p><b>Note:</b>
Windows 3.0 does not check whether the region extends beyond the end of
a segment
<p><b>BUG:</b>
Windows 3.0 in enhanced mode does not return a correct code on error
<p><b>See Also:</b>
<a href="rb-6263.htm" tppabs="http://www.ctyme.com/intr/rb-6263.htm">AX=8103h</a> - <a href="rb-6266.htm" tppabs="http://www.ctyme.com/intr/rb-6266.htm">AX=8106h</a>
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<b>Category: <a href="cat-008.htm" tppabs="http://www.ctyme.com/intr/cat-008.htm">
Disk I/O Enhancements</a>
- <a href="int-4b-1.htm" tppabs="http://www.ctyme.com/intr/int-4B.htm">
Int 4Bh</a>
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