MdeModulePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdeModulePkg / Universal / Acpi / BootScriptExecutorDxe / IA32 / S3Asm.nasm

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