1 files changed, 62 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/S3Asm.nasm b/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/S3Asm.nasm
new file mode 100644
index 00000000..1f7c1f58
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/S3Asm.nasm
@@ -0,0 +1,62 @@
+;; @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
+