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;; @file
; This is the assembly code for transferring to control to OS S3 waking vector
; for X64 platform
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
;
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
;;
.code
EXTERNDEF AsmFixAddress16:DWORD
EXTERNDEF AsmJmpAddr32:DWORD
AsmTransferControl PROC
; rcx S3WakingVector :DWORD
; rdx AcpiLowMemoryBase :DWORD
lea eax, @F
mov r8, 2800000000h
or rax, r8
push rax
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, eax
mov es, eax
mov fs, eax
mov gs, eax
mov ss, eax
mov rax, cr0
mov rbx, cr4
DB 66h
and eax, ((NOT 080000001h) AND 0ffffffffh)
and bl, NOT (1 SHL 5)
mov cr0, rax
DB 66h
mov ecx, 0c0000080h
rdmsr
and ah, NOT 1
wrmsr
mov cr4, rbx
DB 0eah ; jmp far @jmp_addr
@jmp_addr DD ?
AsmTransferControl ENDP
AsmTransferControl32 PROC
; S3WakingVector :DWORD
; AcpiLowMemoryBase :DWORD
push rbp
mov ebp, esp
DB 8dh, 05h ; lea eax, AsmTransferControl16
AsmFixAddress16 DD ?
push 28h ; CS
push rax
retf
AsmTransferControl32 ENDP
AsmTransferControl16 PROC
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 rax, 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 AsmJmpAddr32
AsmJmpAddr32 DD ?
AsmTransferControl16 ENDP
END
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