DevHelp FreePhys

This service releases physical memory allocated by the DevHlp_AllocPhys.

Syntax

C

USHORT APIENTRY DevHelp_FreePhys(PULONG PhysAddr)

Assembler

MOV   BX,address_low          ; 32-bit physical address
MOV   AX,address_high         ;
MOV   DL,DevHlp_FreePhys

CALL  [Device_Help]

Parameters

C

PhysAddr (PULONG) - input 

Pointer to the 32 bit physical address of memory to be freed.

Assembler

MOV   BX,address_low          ; 32-bit physical address
MOV   AX,address_high         ;

Return Code

C

Success Indicator

0

Possible errors

Memory not freed

Assembler

  'C' Clear if memory freed.
  'C' Set if memory not freed.

Remarks

Any memory that the physical device driver allocated by way of the DevHlp_AllocPhys should be released prior to device driver termination. Memory that was not allocated with AllocPhys cannot be freed.

Example Code

C

#include  "dhcalls.h"

USHORT APIENTRY DevHelp_FreePhys(PULONG PhysAddr)