add internal command header reference

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ebc / SwitchStack.c

diff --git a/MdePkg/Library/BaseLib/Ebc/SwitchStack.c b/MdePkg/Library/BaseLib/Ebc/SwitchStack.c
index 73b8edb1afae601487986ab73301120bcb13f996..1f76933ae0ff2126f49238e4e300a2a272ead242 100644 (file)
--- a/MdePkg/Library/BaseLib/Ebc/SwitchStack.c
+++ b/MdePkg/Library/BaseLib/Ebc/SwitchStack.c
@@ -1,7 +1,7 @@
 /** @file\r
   Switch Stack functions.\r
 \r
-  Copyright (c) 2006, Intel Corporation<BR>\r
+  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
   All rights reserved. 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
@@ -13,14 +13,21 @@
   Module Name:  SwitchStack.c\r
 \r
 **/\r
+//\r
+// Include common header file for this module.\r
+//\r
+#include <BaseLibInternals.h>\r
 \r
 /**\r
   Transfers control to a function starting with a new stack.\r
 \r
-  Transfers control to the function specified by EntryPoint using the new stack\r
-  specified by NewStack and passing in the parameters specified by Context1 and\r
-  Context2. Context1 and Context2 are optional and may be NULL. The function\r
-  EntryPoint must never return.\r
+  Transfers control to the function specified by EntryPoint using the\r
+  new stack specified by NewStack and passing in the parameters specified\r
+  by Context1 and Context2.  Context1 and Context2 are optional and may\r
+  be NULL.  The function EntryPoint must never return.\r
+  Marker will be ignored on IA-32, x64, and EBC.\r
+  IPF CPUs expect one additional parameter of type VOID * that specifies\r
+  the new backing store pointer.\r
 \r
   If EntryPoint is NULL, then ASSERT().\r
   If NewStack is NULL, then ASSERT().\r
@@ -32,21 +39,30 @@
                       function.\r
   @param  NewStack    A pointer to the new stack to use for the EntryPoint\r
                       function.\r
+  @param  Marker      VA_LIST marker for the variable argument list.\r
 \r
 **/\r
 VOID\r
 EFIAPI\r
-SwitchStack (\r
+InternalSwitchStack (\r
   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,\r
-  IN      VOID                      *Context1,  OPTIONAL\r
-  IN      VOID                      *Context2,  OPTIONAL\r
-  IN      VOID                      *NewStack\r
+  IN      VOID                      *Context1,   OPTIONAL\r
+  IN      VOID                      *Context2,   OPTIONAL\r
+  IN      VOID                      *NewStack,\r
+  IN      VA_LIST                   Marker\r
   )\r
+\r
 {\r
   //\r
   // This version of this function does not actually change the stack pointer\r
   // This is to support compilation of CPU types that do not support assemblers\r
   // such as EBC\r
   //\r
+\r
+  //\r
+  // Stack should be aligned with CPU_STACK_ALIGNMENT\r
+  //\r
+  ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);\r
+\r
   EntryPoint (Context1, Context2);\r
 }\r