MdePkg: Replace BSD License with BSD+Patent License

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

diff --git a/MdePkg/Library/BaseLib/SwitchStack.c b/MdePkg/Library/BaseLib/SwitchStack.c
index 353efa8f6e56a31bf426495bbe0dceb36d1129c1..cb9f69f1eaceba690b48e9ca6b8a9af2e348bddd 100644 (file)
--- a/MdePkg/Library/BaseLib/SwitchStack.c
+++ b/MdePkg/Library/BaseLib/SwitchStack.c
@@ -1,28 +1,24 @@
 /** @file\r
   Switch Stack functions.\r
 \r
 /** @file\r
   Switch Stack functions.\r
 \r

-  Copyright (c) 2006, 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
-  Module Name:  SwitchStack.c\r
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+  SPDX-License-Identifier: BSD-2-Clause-Patent\r

 \r
 **/\r
 \r
 \r
 **/\r
 \r

-#include <BaseLibInternals.h>\r
+#include "BaseLibInternals.h"\r

 \r
 /**\r
   Transfers control to a function starting with a new stack.\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 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.  This function\r
+  supports a variable number of arguments following the NewStack parameter.\r
+  These additional arguments are 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
   If EntryPoint is NULL, then ASSERT().\r
   If NewStack is NULL, then ASSERT().\r


@@ -34,22 +30,41 @@
                       function.\r
   @param  NewStack    A pointer to the new stack to use for the EntryPoint\r
                       function.\r
                       function.\r
   @param  NewStack    A pointer to the new stack to use for the EntryPoint\r
                       function.\r

+  @param  ...         This variable argument list is ignored for IA32, x64, and EBC.\r
+                      For IPF, this variable argument list is expected to contain\r
+                      a single parameter of type VOID * that specifies the new backing\r
+                      store pointer.\r
+\r

 \r
 **/\r
 VOID\r
 EFIAPI\r
 SwitchStack (\r
   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,\r
 \r
 **/\r
 VOID\r
 EFIAPI\r
 SwitchStack (\r
   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,\r

-  IN      VOID                      *Context1,\r
-  IN      VOID                      *Context2,\r
-  IN      VOID                      *NewStack\r
+  IN      VOID                      *Context1,  OPTIONAL\r
+  IN      VOID                      *Context2,  OPTIONAL\r
+  IN      VOID                      *NewStack,\r
+  ...\r

   )\r
 {\r
   )\r
 {\r

-  ASSERT (EntryPoint != NULL && NewStack != NULL);\r
+  VA_LIST    Marker;\r
+\r
+  ASSERT (EntryPoint != NULL);\r
+  ASSERT (NewStack != NULL);\r
+\r
+  //\r
+  // New stack must be aligned with CPU_STACK_ALIGNMENT\r
+  //\r
+  ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);\r
+\r
+  VA_START (Marker, NewStack);\r
+\r
+  InternalSwitchStack (EntryPoint, Context1, Context2, NewStack, Marker);\r

 \r
 \r

-#ifdef MDE_CPU_IPF\r
-  ASSERT (((UINTN)NewStack & 0xf) == 0);\r
-#endif\r
+  VA_END (Marker);\r

 \r
 \r

-  InternalSwitchStack (EntryPoint, Context1, Context2, NewStack);\r
+  //\r
+  // InternalSwitchStack () will never return\r
+  //\r
+  ASSERT (FALSE);\r

 }\r
 }\r