Int 4B/AX=8105h

Virtual DMA Specification - SCATTER/GATHER LOCK REGION

AX = 8105h
DX = flags (see #03224)
ES:DI -> Extended DMA descriptor structure (see #03222,#03223)
region size, linear segment, linear offset, and number avail
fields set

Return:
CF clear if successful
EDDS number used field set
if DX bit 6 set, lower 12 bits of BX = offset in first page
CF set on error
AL = error code (see #03218)
EDDS region size field filled with max length in bytes that can be
locked and described in the EDDS table

BUG: Windows 3.0 in enhanced mode may return zero instead of the physical page address for pages which were originally not present

See Also: AX=8103h - AX=8106h


Bitfields for VDS flags:

Bit(s)  Description     (Table 03224)
0-5    reserved (zero)
6      EDDS should be returned with page table entries
7      only present pages should be locked (not-present pages receive entry
of 0000h)
8-15   reserved (zero)

Category: Disk I/O Enhancements - Int 4Bh - V

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