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;**********************************************************************
;**********************************************************************
;** **
;** (C)Copyright 1985-2014, American Megatrends, Inc. **
;** **
;** All Rights Reserved. **
;** **
;** 5555 Oakbrook Parkway, Suite 200, Norcross, GA 30093 **
;** **
;** Phone: (770)-246-8600 **
;** **
;**********************************************************************
;**********************************************************************
;**********************************************************************
; $Header: /Alaska/SOURCE/Modules/Legacy Serial Redirection/SredirBootFail.asm 3 6/16/14 7:40a Divyac $
;
; $Revision: 3 $
;
; $Date: 6/16/14 7:40a $
;**********************************************************************
; Revision History
; ----------------
; $Log: /Alaska/SOURCE/Modules/Legacy Serial Redirection/SredirBootFail.asm $
;
; 3 6/16/14 7:40a Divyac
; [TAG] EIP172120
; [Category] Bug Fix
; [Severity] Important
; [Symptom] Redirection After BIOS POST feature is not working.
; [RootCause] The flag Indicating whether redirection can happen or not
; is not updated.
; 1)The way of Defining signatures and Comparing Signatures are
; different.
; 2)The variables defined in CSM16 files( SreDirBin_Base_Segadd,
; SreDirBin_Base_Offadd, Flag ) are accessed wrongly.
;
; [Solution] a) The pointer used to check for signatures must be
; UINT32* or we should define signatures byte by byte (db
; '$','S','B','F', db '$','S','B','C'). so changed the way of defining
; Signatures in CSM16 files from dd '$SBF' to db '$','S','B','F'.
; b) Variables should be accessed using OFFSET Keyword.
; [Files] SerialBootCall.asm, SerialBootFail.asm
;
; 2 5/29/13 8:54a Srikantakumarp
; [TAG] EIP122394
; [Category] Bug Fix
; [Severity] Normal
; [Symptom] 0xE0000~0xEFFFF was overwrite by Legacy Serial Redirection
; module.
; [RootCause] LegacySerialRedirection driver assumed that
; SerialBootcall.asm will be the first entry in CsmOem16Functions which
; was wrong.
; [Solution] Added a Signature check code for SerialBootCall.asm and
; SredirBootFail.asm before it writes to the memory location
; 0xE0000~0xEFFFF.
; [Files] LegacySredir.c, SerialBootCall.asm, SredirBootFail.asm
;
; 1 2/27/12 5:58a Jittenkumarp
; [TAG] EIP81401
; [Category] New Feature
; [Description] Select Redirection After BIOS POST as BootLoader in
; serial redirection, the behaviour is made same as Core8.
; [Files] LegacySredir.c, LegacySredir.mak, LegacySredir.sdl,
; LegacySredir_Setup.c, LegacySredir.h ,SerialBootCall.asm,
; SredirBootFail.asm,GRAPHREDIR.ASM, INT10REDIR.ASM, OR_MOD.EQU,
; SREDIR.ASM
;
;**********************************************************************
;<AMI_FHDR_START>
;
; Name: SredirBootFail.asm
;
; Description: Call Back function registered for CSM16_OEM_ON_BOOT_FAIL
;
;<AMI_FHDR_END>
;**********************************************************************
;----------------------------------------------------------------------------
; INCLUDE FILES
;----------------------------------------------------------------------------
include token.equ
;----------------------------------------------------------------------------
; EXTERNS USED
;----------------------------------------------------------------------------
.586p
OEM16_CSEG SEGMENT PARA PUBLIC 'CODE' USE16
ASSUME cs:OEM16_CSEG, ds:OEM16_CSEG
;-------------------------------------------------------------------------
PUBLIC EnableLegcaySredirModuleStart
EnableLegcaySredirModuleStart LABEL BYTE
jmp SHORT EnableLegcaySredirCsm16Api
db '$','S','B','F'
SreDirBin_Base_Segadd dw 0000h ;SreDirBin Segement Address
SreDirBin_Base_Offadd dw 0000h ;SreDirbin offset Address
Flag dw 0000h
;----------------------------------------------------------------------------
; IMPORTANT: Do not put any OEM/CHIPSET code above this, the above code and
; and data are at fixed locations.
;----------------------------------------------------------------------------
;-------------------------------------------------------------------------
; LEGACYSREDIR_CSM16_API_Start
;----------------------------------------------------------------------------
; This routine is implementation of the CSM16 API #6.
; Input: BX - SreDirBin Segment add
; BX - SreDirBin Offset add
; AX - Flag offset value
;
; Output: None
;
; Register Usage: Do not destroy any register
;
;----------------------------------------------------------------------------
EnableLegcaySredirCsm16Api 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 newOffset-EnableLegcaySredirModuleStart
retf ; Execute from new CS:IP
newOffset:
push bx
push si
push ax
push es
push 0
pop es
mov si, offset SreDirBin_Base_Segadd
mov bx, word ptr cs:[si]
mov es, bx
mov si, offset SreDirBin_Base_Offadd
mov bx, word ptr cs:[si]
mov si, offset Flag
mov ax, word ptr cs:[si]
mov si, ax
add si, bx
mov al, 00h
mov byte ptr es:[si], al
pop es
pop ax
pop si
pop bx
retf
EnableLegcaySredirCsm16Api ENDP
OEM16_CSEG ENDS
END
;**********************************************************************
;**********************************************************************
;** **
;** (C)Copyright 1985-2014, American Megatrends, Inc. **
;** **
;** All Rights Reserved. **
;** **
;** 5555 Oakbrook Parkway, Suite 200, Norcross, GA 30093 **
;** **
;** Phone: (770)-246-8600 **
;** **
;**********************************************************************
;**********************************************************************
|
