mirror of https://github.com/acidanthera/audk.git
52 lines
1.2 KiB
NASM
52 lines
1.2 KiB
NASM
;; @file
|
|
; This is the assembly code for transferring to control to OS S3 waking vector
|
|
; for IA32 platform
|
|
;
|
|
; Copyright (c) 2013-2015 Intel Corporation.
|
|
;
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
.586P
|
|
.model flat,C
|
|
.code
|
|
|
|
;-----------------------------------------
|
|
;VOID
|
|
;AsmTransferControl (
|
|
; IN UINT32 S3WakingVector,
|
|
; IN UINT32 AcpiLowMemoryBase
|
|
; );
|
|
;-----------------------------------------
|
|
|
|
AsmTransferControl PROC
|
|
; S3WakingVector :DWORD
|
|
; AcpiLowMemoryBase :DWORD
|
|
push ebp
|
|
mov ebp, esp
|
|
lea eax, @F
|
|
push 28h ; CS
|
|
push eax
|
|
mov ecx, [ebp + 8]
|
|
shrd ebx, ecx, 20
|
|
and ecx, 0fh
|
|
mov bx, cx
|
|
mov @jmp_addr, ebx
|
|
retf
|
|
@@:
|
|
DB 0b8h, 30h, 0 ; mov ax, 30h as selector
|
|
mov ds, ax
|
|
mov es, ax
|
|
mov fs, ax
|
|
mov gs, ax
|
|
mov ss, ax
|
|
mov eax, cr0 ; Get control register 0
|
|
DB 66h
|
|
DB 83h, 0e0h, 0feh ; and eax, 0fffffffeh ; Clear PE bit (bit #0)
|
|
DB 0fh, 22h, 0c0h ; mov cr0, eax ; Activate real mode
|
|
DB 0eah ; jmp far @jmp_addr
|
|
@jmp_addr DD ?
|
|
|
|
AsmTransferControl ENDP
|
|
|
|
END
|