PI Enable:

[mirror_edk2.git] / MdeModulePkg / Core / Pei / Ipf / InternalSwitchStack.c

diff --git a/MdeModulePkg/Core/Pei/Ipf/InternalSwitchStack.c b/MdeModulePkg/Core/Pei/Ipf/InternalSwitchStack.c
new file mode 100644 (file)
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+++ b/MdeModulePkg/Core/Pei/Ipf/InternalSwitchStack.c
@@ -0,0 +1,78 @@
+/** @file\r
+  SwitchStack() function for IPF.\r
+\r
+  Copyright (c) 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
+  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
+**/\r
+\r
+#include <PeiMain.h>\r
+\r
+VOID\r
+EFIAPI\r
+IpfAsmSwitchStack (\r
+    IN  SWITCH_STACK_ENTRY_POINT  EntryPoint,\r
+    IN  VOID                      *ConText1, OPTIONAL\r
+    IN  VOID                      *Context2, OPTIONAL\r
+    IN  VOID                      *Context3, OPTIONAL\r
+    IN  VOID                      *NewStack,\r
+    IN  VOID                      *NewBsp\r
+    );\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\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
+\r
+  @param  EntryPoint  A pointer to function to call with the new stack.\r
+  @param  Context1    A pointer to the context to pass into the EntryPoint\r
+                      function.\r
+  @param  Context2    A pointer to the context to pass into the EntryPoint\r
+                      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
+InternalSwitchStack (\r
+  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,\r
+  IN      VOID                      *Context1,   OPTIONAL\r
+  IN      VOID                      *Context2,   OPTIONAL\r
+  IN      VOID                      *Context3,   OPTIONAL\r
+  IN      VOID                      *NewStack,\r
+  IN      VA_LIST                   Marker\r
+  )\r
+\r
+{\r
+  VOID                      *NewBsp;\r
+\r
+  //\r
+  // Get new backing store pointer from variable list\r
+  //\r
+  NewBsp   = VA_ARG (Marker, VOID *);\r
+\r
+  //\r
+  // Stack should be aligned with CPU_STACK_ALIGNMENT\r
+  //\r
+  ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);\r
+  ASSERT (((UINTN)NewBsp & (CPU_STACK_ALIGNMENT - 1)) == 0);\r
+\r
+  IpfAsmSwitchStack (EntryPoint, Context1, Context2, Context3, NewStack, NewBsp);\r
+}\r