224 lines
13 KiB
HTML
224 lines
13 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 4B/AX=8103h
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 4B/AX=8103h - Virtual DMA Specification - LOCK DMA REGION -
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AX = 8103h
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DX = flags (see #03220)
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ES:DI - DMA descriptor structure (see #03221,#03222,#03223)
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Return: CF clear if successful
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DDS physical address field filled in
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DDS buffer ID field filled (0000h if no buffer allocated)
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CF set on error
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AL = error code (see #03218)
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DDS region size field filled wth maximum contiguous length in bytes
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BUGS: Windows 3.0 does not correctly support automatic remapping or copying
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">
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<META NAME="robots" CONTENT="none">
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</HEAD>
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<BODY BGCOLOR="#FFD0A0">
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<center>
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<h2>Int 4B/AX=8103h
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</h2>
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</center><p>
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<td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<h3><font color=#C00040>Virtual DMA Specification - LOCK DMA REGION</font></h3>
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<PRE>
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AX = 8103h
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DX = flags <a href="rb-6263.htm#Table3220" tppabs="http://www.ctyme.com/intr/rb-6263.htm#Table3220">(see #03220)</a>
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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,#03223)<br>
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<p><b>Return:</b><br>CF clear if successful
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DDS physical address field filled in
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DDS buffer ID field filled (0000h if no buffer allocated)
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CF set on error
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AL = error code <a href="rb-6262.htm#Table3218" tppabs="http://www.ctyme.com/intr/rb-6262.htm#Table3218">(see #03218)</a>
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DDS region size field filled wth maximum contiguous length in bytes
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</PRE>
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<p><b>BUGS:</b>
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Windows 3.0 does not correctly support automatic remapping or copying
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in enhanced mode.
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Windows 3.0 in enhanced mode does not return a correct code on error
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<p><b>See Also:</b>
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<a href="rb-6264.htm" tppabs="http://www.ctyme.com/intr/rb-6264.htm">AX=8104h</a> - <a href="rb-6265.htm" tppabs="http://www.ctyme.com/intr/rb-6265.htm">AX=8105h</a>
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<PRE>
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<p>
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Bitfields for VDS flags:
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<a name=table3220></a>
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Bit(s) Description (Table 03220)
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0 reserved (zero)
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1 data should be copied into buffer (ignored if 2 set)
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2 buffer should not be allocated if region noncontiguous or crosses
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physical alignment boundary specified by 4-5
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3 don't attempt automatic remap
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4 region must not cross 64K physical alignment boundary
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5 region must not cross 128K physical alignment boundary
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6-15 reserved (zero)
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<p>
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Format of DMA descriptor structure (DDS):
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<a name=table3221></a>
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Offset Size Description (Table 03221)
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00h DWORD region size
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04h DWORD offset
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08h WORD segment/selector
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0Ah WORD buffer ID
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0Ch DWORD physical address
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<p>
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Format of Extended DMA descriptor structure (EDDS):
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<a name=table3222></a>
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Offset Size Description (Table 03222)
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00h DWORD region size
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04h DWORD offset
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08h WORD segment/selector
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0Ah WORD reserved
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0Ch WORD number available
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0Eh WORD number used
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10h DWORD region 0 physical address
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14h DWORD region 0 size in bytes
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18h DWORD region 1 physical address
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1Ch DWORD region 1 size in bytes.
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...
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<p>
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Format of Extended DMA descriptor structure (EDDS) with page table entries:
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<a name=table3223></a>
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Offset Size Description (Table 03223)
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00h DWORD region size
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04h DWORD offset
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08h WORD segment/selector
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0Ah WORD reserved
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0Ch WORD number available
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0Eh WORD number used
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10h DWORD page table entry 0 (same as 80386 page table entry)
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14h DWORD page table entry 1.
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...
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</PRE>
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<p><b>Note:</b>
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Bits 1-11 of the page table entries should be zero; bit 0 set if page
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is present and locked
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<p>
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<b>Category: <a href="cat-008.htm" tppabs="http://www.ctyme.com/intr/cat-008.htm">
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Disk I/O Enhancements</a>
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- <a href="int-4b-1.htm" tppabs="http://www.ctyme.com/intr/int-4B.htm">
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Int 4Bh</a>
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- <a href="alpha-v.htm" tppabs="http://www.ctyme.com/intr/alpha-v.htm">
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V</a>
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