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Diffstat (limited to 'Board/EM/Sredir/SerialCallback.Asm')
| -rw-r--r-- | Board/EM/Sredir/SerialCallback.Asm | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/Board/EM/Sredir/SerialCallback.Asm b/Board/EM/Sredir/SerialCallback.Asm new file mode 100644 index 0000000..6c5005c --- /dev/null +++ b/Board/EM/Sredir/SerialCallback.Asm @@ -0,0 +1,185 @@ + + 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 ** +;** ** +;**************************************************************************** +;**************************************************************************** |