View source for DevHelp FreePhys

{{DISPLAYTITLE:DevHelp_FreePhys}}
This service releases physical memory allocated by the DevHlp_AllocPhys. 
==Syntax==
===C===
<PRE>
USHORT APIENTRY DevHelp_FreePhys(PULONG PhysAddr)
</PRE>

===Assembler===
<PRE>
MOV   BX,address_low          ; 32-bit physical address
MOV   AX,address_high         ;
MOV   DL,DevHlp_FreePhys

CALL  [Device_Help]
</PRE>
==Parameters==
===C===
; PhysAddr (PULONG) - input : Pointer to the 32 bit physical address of memory to be freed.

===Assembler===
<PRE>
MOV   BX,address_low          ; 32-bit physical address
MOV   AX,address_high         ;
</PRE>

==Return Code==
===C===
; Success Indicator: 0

; Possible errors:
::Memory not freed

===Assembler===
<PRE>
  'C' Clear if memory freed.
  'C' Set if memory not freed.
</PRE>

==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===
<PRE>
#include  "dhcalls.h"

USHORT APIENTRY DevHelp_FreePhys(PULONG PhysAddr)
</PRE>

==Related Functions==

[[Category:DevHlps]]