Add IntelFsp2Pkg and IntelFsp2WrapperPkg.

[mirror_edk2.git] / IntelFsp2WrapperPkg / Library / SecFspWrapperPlatformSecLibSample / Ia32 / Stack.S

diff --git a/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.S b/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.S
new file mode 100644 (file)
index 0000000..ae42935
--- /dev/null
+++ b/IntelFsp2WrapperPkg/Library/SecFspWrapperPlatformSecLibSample/Ia32/Stack.S
@@ -0,0 +1,77 @@
+#------------------------------------------------------------------------------\r
+#\r
+# Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r
+# This program and the accompanying materials\r
+# are licensed and made available under the terms and conditions of the BSD License\r
+# which accompanies this distribution.  The full text of the license may be found at\r
+# http://opensource.org/licenses/bsd-license.php.\r
+#\r
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+#\r
+# Abstract:\r
+#\r
+#   Switch the stack from temporary memory to permenent memory.\r
+#\r
+#------------------------------------------------------------------------------\r
+\r
+\r
+#------------------------------------------------------------------------------\r
+# VOID\r
+# EFIAPI\r
+# SecSwitchStack (\r
+#   UINT32   TemporaryMemoryBase,\r
+#   UINT32   PermanentMemoryBase\r
+#   )#\r
+#------------------------------------------------------------------------------\r
+ASM_GLOBAL ASM_PFX (SecSwitchStack)\r
+ASM_PFX(SecSwitchStack):\r
+    #\r
+    # Save standard registers so they can be used to change stack\r
+    #\r
+    pushl %eax\r
+    pushl %ebx\r
+    pushl %ecx\r
+    pushl %edx\r
+\r
+    #\r
+    # !!CAUTION!! this function address's is pushed into stack after\r
+    # migration of whole temporary memory, so need save it to permanent\r
+    # memory at first!\r
+    #\r
+    movl  20(%esp), %ebx         # Save the first parameter\r
+    movl  24(%esp), %ecx         # Save the second parameter\r
+\r
+    #\r
+    # Save this function's return address into permanent memory at first.\r
+    # Then, Fixup the esp point to permanent memory\r
+    #\r
+    movl  %esp, %eax\r
+    subl  %ebx, %eax\r
+    addl  %ecx, %eax\r
+    movl  0(%esp), %edx          # copy pushed register's value to permanent memory\r
+    movl  %edx, 0(%eax)\r
+    movl  4(%esp), %edx\r
+    movl  %edx, 4(%eax)\r
+    movl  8(%esp), %edx\r
+    movl  %edx, 8(%eax)\r
+    movl  12(%esp), %edx\r
+    movl  %edx, 12(%eax)\r
+    movl  16(%esp), %edx        # Update this function's return address into permanent memory\r
+    movl  %edx, 16(%eax)\r
+    movl  %eax, %esp            # From now, esp is pointed to permanent memory\r
+\r
+    #\r
+    # Fixup the ebp point to permanent memory\r
+    #\r
+    movl  %ebp, %eax\r
+    subl  %ebx, %eax\r
+    addl  %ecx, %eax\r
+    movl  %eax, %ebp            # From now, ebp is pointed to permanent memory\r
+\r
+    popl  %edx\r
+    popl  %ecx\r
+    popl  %ebx\r
+    popl  %eax\r
+    ret\r
+\r