1 files changed, 87 insertions, 0 deletions
diff --git a/EDK/Foundation/Core/Pei/Ia32/SwitchCoreStacks.asm b/EDK/Foundation/Core/Pei/Ia32/SwitchCoreStacks.asm
new file mode 100644
index 0000000..655d43f
--- /dev/null
+++ b/EDK/Foundation/Core/Pei/Ia32/SwitchCoreStacks.asm
@@ -0,0 +1,87 @@
+      TITLE   SwitchCoreStacks.asm: Core stack switching routine
+
+;------------------------------------------------------------------------------
+;Copyright (c) 2004, Intel Corporation                                                         
+;All rights reserved. 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.             
+;
+;Module Name:
+;
+;    SwitchCoreStacks.asm
+;
+;Abstract:
+;
+;    Core stack switching routine, invoked when real system memory is
+;    discovered and installed.
+;
+;------------------------------------------------------------------------------
+
+  .686P
+  .XMM
+  .MODEL SMALL
+  .CODE
+
+AsmWriteMm7 PROTO C
+
+AsmWriteMm7 PROC C 
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmWriteMm7 (
+;   IN UINT64   Value
+;   );
+;------------------------------------------------------------------------------
+    movq    mm7, [esp + 4]
+    ret
+AsmWriteMm7 ENDP
+  
+SwitchCoreStacks PROTO C  EntryPoint: DWORD, Parameter1: DWORD, Parameter2: DWORD, NewStack: DWORD
+
+SwitchCoreStacks PROC C   EntryPoint: DWORD, Parameter1: DWORD, Parameter2: DWORD, NewStack: DWORD
+
+;------------------------------------------------------------------------------
+; VOID
+; SwitchCoreStacks (
+;   IN VOID  *EntryPoint,
+;   IN UINTN Parameter1,
+;   IN UINTN Parameter2,
+;   IN VOID  *NewStack
+;   )
+;
+; Routine Description:
+; 
+;   Routine for PEI switching stacks.
+;
+; Arguments:
+;
+;   EntryPoint - Entry point with new stack.
+;   Parameter1 - First parameter for entry point.
+;   Parameter2 - Second parameter for entry point.
+;   NewStack   - Pointer to new stack.
+;   
+; Returns:
+;
+;   None
+;
+;----------------------------------------------------
+
+  mov    ebx, Parameter1
+  mov    edx, Parameter2
+  mov    ecx, EntryPoint
+  mov    esp, NewStack
+  
+  ; First push Parameter2, and then Parameter1.
+  push   edx
+  push   ebx
+  call   ecx
+  
+  ret
+  
+SwitchCoreStacks ENDP
+
+END