1 files changed, 77 insertions, 0 deletions
diff --git a/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/Ia32/Stack.asm b/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/Ia32/Stack.asm
new file mode 100644
index 0000000000..1efab52059
--- /dev/null
+++ b/IntelFsp2Pkg/Library/BaseFspSwitchStackLib/Ia32/Stack.asm
@@ -0,0 +1,77 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2014 - 2015, 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.
+;
+; Abstract:
+;
+;   Switch the stack from temporary memory to permenent memory.
+;
+;------------------------------------------------------------------------------
+
+    .586p
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; UINT32
+; EFIAPI
+; Pei2LoaderSwitchStack (
+;   VOID
+;   )
+;------------------------------------------------------------------------------
+EXTERNDEF  C   MeasurePoint:PROC
+Pei2LoaderSwitchStack   PROC C PUBLIC
+    xor     eax, eax
+    jmp     FspSwitchStack
+Pei2LoaderSwitchStack   ENDP
+
+;------------------------------------------------------------------------------
+; UINT32
+; EFIAPI
+; Loader2PeiSwitchStack (
+;   VOID
+;   )
+;------------------------------------------------------------------------------
+Loader2PeiSwitchStack   PROC C PUBLIC
+    jmp     FspSwitchStack
+Loader2PeiSwitchStack   ENDP
+
+;------------------------------------------------------------------------------
+; UINT32
+; EFIAPI
+; FspSwitchStack (
+;   VOID
+;   )
+;------------------------------------------------------------------------------
+EXTERNDEF  C   SwapStack:PROC
+FspSwitchStack   PROC C PUBLIC
+    ; Save current contexts
+    push    eax
+    pushfd
+    cli
+    pushad
+    sub     esp, 8
+    sidt    fword ptr [esp]
+
+    ; Load new stack
+    push    esp
+    call    SwapStack
+    mov     esp, eax
+
+    ; Restore previous contexts
+    lidt    fword ptr [esp]
+    add     esp, 8
+    popad
+    popfd
+    add     esp, 4
+    ret
+FspSwitchStack   ENDP
+
+    END