1 ;; @file 2 ; This is the assembly code for transferring to control to OS S3 waking vector 3 ; for IA32 platform 4 ; 5 ; Copyright (c) 2013-2015 Intel Corporation. 6 ; 7 ; This program and the accompanying materials 8 ; are licensed and made available under the terms and conditions of the BSD License 9 ; which accompanies this distribution. The full text of the license may be found at 10 ; http://opensource.org/licenses/bsd-license.php 11 ; 12 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 13 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 14 15 .586P 16 .model flat,C 17 .code 18 19 ;----------------------------------------- 20 ;VOID 21 ;AsmTransferControl ( 22 ; IN UINT32 S3WakingVector, 23 ; IN UINT32 AcpiLowMemoryBase 24 ; ); 25 ;----------------------------------------- 26 27 AsmTransferControl PROC 28 ; S3WakingVector :DWORD 29 ; AcpiLowMemoryBase :DWORD 30 push ebp 31 mov ebp, esp 32 lea eax, @F 33 push 28h ; CS 34 push eax 35 mov ecx, [ebp + 8] 36 shrd ebx, ecx, 20 37 and ecx, 0fh 38 mov bx, cx 39 mov @jmp_addr, ebx 40 retf 41 @@: 42 DB 0b8h, 30h, 0 ; mov ax, 30h as selector 43 mov ds, ax 44 mov es, ax 45 mov fs, ax 46 mov gs, ax 47 mov ss, ax 48 mov eax, cr0 ; Get control register 0 49 DB 66h 50 DB 83h, 0e0h, 0feh ; and eax, 0fffffffeh ; Clear PE bit (bit #0) 51 DB 0fh, 22h, 0c0h ; mov cr0, eax ; Activate real mode 52 DB 0eah ; jmp far @jmp_addr 53 @jmp_addr DD ? 54 55 AsmTransferControl ENDP 56 57 END 58
