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;; @file
; This is the assembly code for transferring to control to OS S3 waking vector
; for IA32 platform
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
;
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
;;
SECTION .text
global ASM_PFX(AsmFixAddress16)
global ASM_PFX(AsmJmpAddr32)
;-----------------------------------------
;VOID
;AsmTransferControl (
; IN UINT32 S3WakingVector,
; IN UINT32 AcpiLowMemoryBase
; );
;-----------------------------------------
global ASM_PFX(AsmTransferControl)
ASM_PFX(AsmTransferControl):
; S3WakingVector :DWORD
; AcpiLowMemoryBase :DWORD
push ebp
mov ebp, esp
lea eax, [.0]
push 0x28 ; CS
push eax
mov ecx, [ebp + 8]
shrd ebx, ecx, 20
and ecx, 0xf
mov bx, cx
mov [@jmp_addr + 1], ebx
retf
BITS 16
.0:
mov ax, 0x30
o32 mov ds, eax
o32 mov es, eax
o32 mov fs, eax
o32 mov gs, eax
o32 mov ss, eax
mov eax, cr0 ; Get control register 0
and eax, 0x0fffffffe ; Clear PE bit (bit #0)
mov cr0, eax ; Activate real mode
@jmp_addr:
jmp 0x0:0x0
global ASM_PFX(AsmTransferControl32)
ASM_PFX(AsmTransferControl32):
jmp ASM_PFX(AsmTransferControl)
; dummy
global ASM_PFX(AsmTransferControl16)
ASM_PFX(AsmTransferControl16):
ASM_PFX(AsmFixAddress16): DD 0
ASM_PFX(AsmJmpAddr32): DD 0
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