DevHelp ABIOSCall

This service starts an ABIOS function for the Operating System Transfer Convention.

Syntax
USHORT APIENTRY DevHelp_ABIOSCall (USHORT Lid,                                   NPBYTE ReqBlk,                                    USHORT Entry_Type)

Parameters

 * Lid (USHORT) - (input):Logical ID
 * ReqBlk (NPBYTE) - (input):Offset in data segment to ABIOS request block
 * Entry_Type (USHORT) - input:Specifies entry point
 * ABIOS_EP_START    start
 * ABIOS_EP_INTERRUPT interrupt
 * ABIOS_EP_TIMEOUT  timeout

Return Code
Success indicator: 0

Possible errors:
 * ERROR_LID_DOES_NOT_EXIST (0x02)
 * ERROR_ABIOS_NOT_PRESENT  (0x03)
 * ERROR_NOT_YOUR_LID       (0x04)
 * ERROR_INVALID_ENTRY_POINT (0x05)

Remarks
ABIOSCall sets up the stack for the call to ABIOS. The indicated ABIOS function is called according to the Operating System Transfer Convention. When the ABIOS function returns, ABIOSCall cleans up the stack before returning to the physical device driver.

The DS register must point to the physical device driver's data segment. If the DS register was used in a previous call to PhysToVirt, it must be reset to the device driver's data segment.

C
Calling Sequence in C 
 * 1) include "abios.h"
 * 2) include "dhcalls.h"

USHORT APIENTRY DevHelp_ABIOSCall (USHORT Lid,                                  NPBYTE ReqBlk,                                   USHORT Entry_Type) 

Assembler
Calling Sequence in Assembler  MOV  AX,LID              ; Logical ID MOV   SI,RB_Offset        ; Offset in data segment to ABIOS request block MOV  DH,Entry_Point      ; Specifies entry point ; 0 = start ; 1 = interrupt ; 2 = timeout MOV  DL,DevHlp_ABIOSCall

CALL [Device_Help]  Results in Assembler  'C' Clear if successful. The ABIOS service is invoked.

'C' Set if error. AX = Error code. Possible errors: ERROR_LID_DOES_NOT_EXIST             (0x02) ERROR_ABIOS_NOT_PRESENT              (0x03) ERROR_NOT_YOUR_LID                   (0x04) ERROR_INVALID_ENTRY_POINT            (0x05) 