MFSH_VIRT2PHYS - Convert virtual to physical address

Purpose

Translate the address of a data buffer into a physical address.

Calling Sequence

int far pascal MFSH_VIRT2PHYS(ulVirtAddr, pulPhysAddr) unsigned long ulVirtAddr; unsigned long far * pulPhysAddr;

Where

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.

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.