MFSH VIRT2PHYS

From EDM2
Jump to: navigation, search

Convert virtual to physical address. Translate the address of a data buffer into a physical address.

Syntax

int far pascal MFSH_VIRT2PHYS(ulVirtAddr, pulPhysAddr)

Parameters

ulVirtAddr
contains the virtual address of the data area.
PhysAddr
is a pointer to a double word in which the helper returns the physical address of the data area.

Returns

If no error is detected, a zero error code is returned. If an error is detected, the following error is returned:

ERROR_PROTECTION_VIOLATION
the supplied address is invalid.

Sample

unsigned long ulVirtAddr;
unsigned long far * pulPhysAddr;

int far pascal MFSH_VIRT2PHYS(ulVirtAddr, pulPhysAddr)

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 VIRTTOPHYS.