;; @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