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TITLE SerialCallback.ASM - Oem callback function from sredir.bin
;****************************************************************************
;****************************************************************************
;** **
;** (C)Copyright 1985-2010, American Megatrends, Inc. **
;** **
;** All Rights Reserved. **
;** **
;** 5555 Oakbrook Pkwy, Suite 200, Norcross, GA 30093 **
;** **
;** Phone (770)-246-8600 **
;** **
;****************************************************************************
;****************************************************************************
;****************************************************************************
; $Header: /Alaska/SOURCE/Modules/Legacy Serial Redirection/SerialCallback.ASM 1 5/03/10 1:53a Rameshr $
;
; $Revision: 1 $
;
; $Date: 5/03/10 1:53a $
;****************************************************************************
; Revision History
; ----------------
; $Log: /Alaska/SOURCE/Modules/Legacy Serial Redirection/SerialCallback.ASM $
;
; 1 5/03/10 1:53a Rameshr
; Callback function added for read and write function of the Serial Port.
; EIP 37850
;
;****************************************************************************
;----------------------------------------------------------------------------
; INCLUDE FILES
;----------------------------------------------------------------------------
;----------------------------------------------------------------------------
; EXTERNS USED
;----------------------------------------------------------------------------
.586p
OEM16_CSEG SEGMENT PARA PUBLIC 'CODE' USE16
ASSUME cs:OEM16_CSEG, ds:OEM16_CSEG
;-------------------------------------------------------------------------
PUBLIC SerialCallBackApiModuleStart
SerialCallBackApiModuleStart LABEL BYTE
jmp SHORT SerialCallbackCsm16Api
;<AMI_PHDR_START>
;----------------------------------------------------------------------------
;
; Procedure: SerialCsm16_API
;
; Description: This routine is implementation of the CSM16 API #B
;
; Input: CX 00h - Serial Read
; 01h - Serial Write
;
; Output:
;
; Modified: None
;
;----------------------------------------------------------------------------
;<AMI_PHDR_END>
SerialCallbackCsm16Api PROC FAR PUBLIC
; Adjust current IP so that the data offsets are valid
call $+3 ; Push curent IP
pop bx ; Get current IP in BX
shr bx, 4
mov ax, cs ; Always x000h
add ax, bx ; New CS
push ax
push newSerialOffset-SerialCallBackApiModuleStart
retf ; Execute from new CS:IP
newSerialOffset:
push bp
mov bp, sp
mov dx, ss:[bp+42h] ; Serial Port Address
mov ax, ss:[bp+40h] ; Write Data, For read it's invalid
cmp cx, 0
je SerialRead
cmp cx,1
je SerialWrite
jmp UnknownFunction
SerialRead:
Call ReadSerialPort
jmp UnknownFunction
SerialWrite:
Call WriteSerialPort
jmp UnknownFunction
UnknownFunction:
pop bp
; Adjust sp as if we returned to csm16_func_ret
add sp, 4 ; cs:ip of F000:csm16_func_ret
; Save AX, restore it after popad
push ax
pop ds
popad
push ds
pop ax
pop gs
pop fs
pop es
pop ds
popf
pop ds
pop si
add sp, 2 ; Do not "pop ax", preserving return code
pop bp
add sp, 4
clc
retf
SerialCallbackCsm16Api ENDP
;<AMI_PHDR_START>
;----------------------------------------------------------------------------
;
; Procedure: WriteSerialPort
;
; Description: Oem Function before serial Read
;
; Input: None
;
; Output: None
;
; Modified: None
;
;----------------------------------------------------------------------------
;<AMI_PHDR_END>
WriteSerialPort PROC NEAR PUBLIC
out dx,al
jmp $+2
ret
WriteSerialPort ENDP
;<AMI_PHDR_START>
;----------------------------------------------------------------------------
;
; Procedure: ReadSerialPort
;
; Description: Oem Function before serial Write
;
; Input: None
;
; Output: None
;
; Modified: None
;
;----------------------------------------------------------------------------
;<AMI_PHDR_END>
ReadSerialPort PROC NEAR PUBLIC
in al,dx
jmp $+2
ret
ReadSerialPort ENDP
OEM16_CSEG ENDS
END
;****************************************************************************
;****************************************************************************
;** **
;** (C)Copyright 1985-2010, American Megatrends, Inc. **
;** **
;** All Rights Reserved. **
;** **
;** 5555 Oakbrook Pkwy, Suite 200, Norcross, GA 30093 **
;** **
;** Phone (770)-246-8600 **
;** **
;****************************************************************************
;****************************************************************************
|
