DevHelp VirtToLin

This service converts a selector:offset pair into a linear address.

Syntax

C

USHORT APIENTRY DevHelp_VirtToLin( SEL    Selector,
                                   ULONG  Offset,
                                   PLIN   LinearAddr)

Assembler

MOV   AX,Selector          ; Selector in  Selector:Offset
MOV   ESI,Offset           ; Offset in Selector:Offset
MOV   DL,DevHlp_VirtToLin

CALL  [Device_Help]

Parameters

C

Selector (SEL)

Selector in the selector:offset

Offset (ULONG)

Offset in the selector:offset

LinearAddr (PLIN)

Linear address to be returned

Assembler

MOV   AX,Selector          ; Selector in  Selector:Offset
MOV   ESI,Offset           ; Offset in Selector:Offset

Return Code

C

Success Indicator: 0

Possible errors: Linear address not obtained.

Assembler

   'C' Clear if Linear address obtained.
       EAX = Linear address.

   'C' Set if linear address not obtained.
       EAX = Error code.

Remarks

None.

Example Code

C

#include  "dhcalls.h"

USHORT APIENTRY DevHelp_VirtToLin( SEL    Selector,
                                   ULONG  Offset,
                                   PLIN   LinearAddr)