MFSH_PHYSTOVIRT - Convert physical to virtual address
Purpose
Translate the physical address of a data buffer into a virtual address.
Calling Sequence
int far pascal MFSH_PHYSTOVIRT(ulAddr, usLen, pusSel)
unsigned long ulAddr;
unsigned short usLen;
unsigned short far * pusSel;
Where
ulAddr is the physical address to be translated.
usLen is the length of the segment for the physical address.
pusSel is a pointer to the word in which the selector or segment is
returned .
Returns
If an error is not detected, a zero error code is returned. If an error is
detected, the following error is returned:
oERROR_PROTECTION_VIOLATION
the supplied address is invalid.
Remarks
This helper is for use by a mini-FSD with an imbedded device driver. It is
the same as the standard device driver helper PHYSTOVIRT. A segment/offset
pair is returned in real mode for addresses below the 1-Meg boundary. Else
a selector/offset pair is returned.
A caller must issue a corresponding UNPHYSTOVIRT before returning to its
caller or using any other helpers.
Created using Inf-PHP v.2 (c) 2003 Yuri Prokushev
Created using Inf-HTML v.0.9b (c) 1995 Peter Childs