1 files changed, 68 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ipf/InternalSwitchStack.c b/MdePkg/Library/BaseLib/Ipf/InternalSwitchStack.c
new file mode 100644
index 0000000000..60d0a37562
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ipf/InternalSwitchStack.c
@@ -0,0 +1,68 @@
+/** @file
+  SwitchStack() function for IPF.
+
+  Copyright (c) 2007, Intel Corporation<BR>
+  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:  InternalSwitchStack.c
+
+**/
+
+#include <BaseLibInternals.h>
+
+/**
+  Transfers control to a function starting with a new stack.
+
+  Transfers control to the function specified by EntryPoint using the
+  new stack specified by NewStack and passing in the parameters specified
+  by Context1 and Context2.  Context1 and Context2 are optional and may
+  be NULL.  The function EntryPoint must never return.
+  Marker will be ignored on IA-32, x64, and EBC.
+  IPF CPUs expect one additional parameter of type VOID * that specifies
+  the new backing store pointer.
+
+  If EntryPoint is NULL, then ASSERT().
+  If NewStack is NULL, then ASSERT().
+
+  @param  EntryPoint  A pointer to function to call with the new stack.
+  @param  Context1    A pointer to the context to pass into the EntryPoint
+                      function.
+  @param  Context2    A pointer to the context to pass into the EntryPoint
+                      function.
+  @param  NewStack    A pointer to the new stack to use for the EntryPoint
+                      function.
+  @param  Marker      VA_LIST marker for the variable argument list.
+
+**/
+VOID
+EFIAPI
+InternalSwitchStack (
+  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
+  IN      VOID                      *Context1,   OPTIONAL
+  IN      VOID                      *Context2,   OPTIONAL
+  IN      VOID                      *NewStack,
+  IN      VA_LIST                   Marker
+  )
+
+{
+  VOID                      *NewBsp;
+
+  //
+  // Get new backing store pointer from variable list
+  //
+  NewBsp   = VA_ARG (Marker, VOID *);
+
+  //
+  // Stack should be aligned with CPU_STACK_ALIGNMENT
+  //
+  ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);
+  ASSERT (((UINTN)NewBsp & (CPU_STACK_ALIGNMENT - 1)) == 0);
+
+  AsmSwitchStackAndBackingStore (EntryPoint, Context1, Context2, NewStack, NewBsp);
+}