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<TITLE>Int 2F/AX=1607h/BX=0015h
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Int 2F/AX=1607h/BX=0015h - MS Windows - DOSMGR VIRTUAL DEVICE API -
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AX = 1607h
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BX = 0015h (VxD identifier of DOSMGR)
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CX = function
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0000h query instance processing
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DX = 0000h
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Return: CX = state
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0000h not instanced
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other instanced (DOS 5+ kernel returns 0001h)
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DX = segment of DOS drivers or 0000h for
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default of 0070h
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<h2>Int 2F/AX=1607h/BX=0015h
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<h3><font color=#C00040>MS Windows - DOSMGR VIRTUAL DEVICE API</font></h3>
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<PRE>
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AX = 1607h
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BX = 0015h (VxD identifier of "DOSMGR")
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CX = function
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0000h query instance processing
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DX = 0000h
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<p><b>Return:</b><br>CX = state
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0000h not instanced
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other instanced (DOS 5+ kernel returns 0001h)
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DX = segment of DOS drivers or 0000h for
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default of 0070h
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ES:BX -> patch table <a href="rb-4506.htm#Table2637" tppabs="http://www.ctyme.com/intr/rb-4506.htm#Table2637">(see #02637)</a>
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0001h set patches in DOS
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DX = bit mask of patch requests <a href="rb-4506.htm#Table2636" tppabs="http://www.ctyme.com/intr/rb-4506.htm#Table2636">(see #02636)</a>
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<p><b>Return:</b><br>AX = B97Ch
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BX = bit mask of patches applied <a href="rb-4506.htm#Table2636" tppabs="http://www.ctyme.com/intr/rb-4506.htm#Table2636">(see #02636)</a>
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DX = A2ABh
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0002h remove patches in DOS (ignored by DOS 5.0 kernel)
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DX = bit mask of patch requests <a href="rb-4506.htm#Table2636" tppabs="http://www.ctyme.com/intr/rb-4506.htm#Table2636">(see #02636)</a>
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<p><b>Return:</b><br>CX = 0000h (DOS 5-6)
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</PRE>
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<p><b>Note:</b>
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Return values are ignored by DOSMGR in Windows 3.1
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0003h get size of DOS data structures
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DX = bit mask of request (only one bit can be set)
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<PRE>
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<p><b>bit 0:</b><br>Current Directory Structure size
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<p><b>Return:</b><br>If supported request:
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AX = B97Ch
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CX = size in bytes of requested structure
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DX = A2ABh
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else:
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CX = 0000h
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all other registers preserved
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0004h determine instanced data structures
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<p><b>Return:</b><br>AX = B97Ch if supported
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DX = A2ABh if supported (DOS 5+ kernel returns 0000h)
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BX = bit mask of instanced items
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<p><b>bit 0:</b><br>CDS
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<p><b>bit 1:</b><br>SFT
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<p><b>bit 2:</b><br>Device list
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<p><b>bit 3:</b><br>DOS swappable data area
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0005h get device driver size
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ES = segment of device driver
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<p><b>Return:</b><br>DX:AX = 0000h:0000h on error (not dev. driver segment)
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DX:AX = A2ABh:B97Ch if successful
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BX:CX = size of device driver in bytes
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</PRE>
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<p><b>Notes:</b>
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DOSMGR (DOS Manager) will check whether the OEM DOS/BIOS data has
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been instanced via this API and will not perform its own default
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instancing of the normal DOS/BIOS data if so; if this API is not
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supported, DOSMGR will also try to access instancing data through
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INT 2F/AX=1603h.
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These functions are supported by the DOS 5+ kernel; DOSMGR contains
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tables of instancing information for earlier versions of DOS.
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See Geoff Chappell's book _DOS_Internals_ for additional discussions of
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DOSMGR's behavior and instancing in general
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<p><b>See Also:</b>
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<a href="rb-4497.htm" tppabs="http://www.ctyme.com/intr/rb-4497.htm">AX=1603h</a> - <a href="rb-4498.htm" tppabs="http://www.ctyme.com/intr/rb-4498.htm">AX=1605h</a> - <a href="rb-4502.htm" tppabs="http://www.ctyme.com/intr/rb-4502.htm">AX=1607h/BX=000Ch</a> - <a href="rb-4505.htm" tppabs="http://www.ctyme.com/intr/rb-4505.htm">AX=16
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<p><b>See Also:</b>
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<a href="rb-4501.htm" tppabs="http://www.ctyme.com/intr/rb-4501.htm">AX=1684h"DEVICE API"</a>
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<PRE>
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<p>
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Bitfields for DOSMGR patch requests:
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<a name=table2636></a>
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Bit(s) Description (Table 02636)
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0 enable critical sections
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1 NOP setting/checking user ID
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2 turn INT 21/AH=3Fh on STDIN into polling loop
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3 trap stack fault in "SYSINIT" to WIN386
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4 BIOS patch to trap "Insert disk X:" to WIN386
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<p>
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Format of DOSMGR patch table:
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<a name=table2637></a>
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Offset Size Description (Table 02637)
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00h 2 BYTEs DOS version (major, minor)
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02h WORD offset in DOS data segment of "SAVEDS"
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04h WORD offset in DOS data segment of "SAVEBX"
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06h WORD offset in DOS data segment of InDOS flag
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08h WORD offset in DOS data segment of User ID word
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0Ah WORD offset in DOS data segment of "CritPatch" table to enable
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critical section calls (see INT 2A/AH=80h)
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0Ch WORD (DOS 5+ only) offset in DOS data segment of "UMB_HEAD",
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containing segment of last MCB in conventional memory
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</PRE>
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<p>
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
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DOS Kernel</a>
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- <a href="int-2f-1.htm" tppabs="http://www.ctyme.com/intr/int-2F.htm">
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Int 2Fh</a>
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