1. Add new API MigratePeiServicesTablePointer() in PeiServicesTablePointerLib class.

[mirror_edk2.git] / MdePkg / Library / PeiServicesTablePointerLibKr7 / PeiServicesTablePointer.c

diff --git a/MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c b/MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c
index 41466512aa1d5b5c8b435f3fd357ad3821a423d4..5da6e1d7578223b16bf7f1727bcdadd831ff6932 100644 (file)
--- a/MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c
+++ b/MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c
@@ -1,40 +1,90 @@
 /** @file\r
-  PEI Services Table Pointer Library implementation for IPF that uses Kernel \r
+  PEI Services Table Pointer Library implementation for IPF that uses Kernel\r
   Register 7 to store the pointer.\r
 \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
-  http://opensource.org/licenses/bsd-license.php                                            \r
+  Copyright (c) 2006 - 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
+  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
-\r
+#include <PiPei.h>\r
 #include <Library/BaseLib.h>\r
+#include <Library/DebugLib.h>\r
 \r
 /**\r
-  The function returns the pointer to PeiServices.\r
+  Retrieves the cached value of the PEI Services Table pointer.\r
 \r
-  The function returns the pointer to PeiServices.\r
-  It will ASSERT() if the pointer to PeiServices is NULL.\r
+  Returns the cached value of the PEI Services Table pointer in a CPU specific manner \r
+  as specified in the CPU binding section of the Platform Initialization Pre-EFI \r
+  Initialization Core Interface Specification.\r
+  \r
+  If the cached PEI Services Table pointer is NULL, then ASSERT().\r
 \r
-  @retval  The pointer to PeiServices.\r
+  @return  The pointer to PeiServices.\r
 \r
 **/\r
-EFI_PEI_SERVICES **\r
+CONST EFI_PEI_SERVICES **\r
 EFIAPI\r
 GetPeiServicesTablePointer (\r
   VOID\r
   )\r
 {\r
-  EFI_PEI_SERVICES  **PeiServices;\r
+  CONST EFI_PEI_SERVICES  **PeiServices;\r
 \r
-  PeiServices = (EFI_PEI_SERVICES **)(UINTN)AsmReadKr7 ();\r
+  PeiServices = (CONST EFI_PEI_SERVICES **)(UINTN)AsmReadKr7 ();\r
   ASSERT (PeiServices != NULL);\r
   return PeiServices;\r
 }\r
 \r
+\r
+/**\r
+  Caches a pointer PEI Services Table. \r
+ \r
+  Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer \r
+  in a CPU specific manner as specified in the CPU binding section of the Platform Initialization \r
+  Pre-EFI Initialization Core Interface Specification. \r
+  The function set the pointer of PEI services in KR7 register \r
+  according to PI specification.\r
+  \r
+  If PeiServicesTablePointer is NULL, then ASSERT().\r
+  \r
+  @param    PeiServicesTablePointer   The address of PeiServices pointer.\r
+**/\r
+VOID\r
+EFIAPI\r
+SetPeiServicesTablePointer (\r
+  IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer\r
+  )\r
+{\r
+  ASSERT (PeiServicesTablePointer != NULL);\r
+  AsmWriteKr7 ((UINT64)(UINTN)PeiServicesTablePointer);\r
+}\r
+  \r
+/**\r
+  Perform CPU specific actions required to migrate the PEI Services Table \r
+  pointer from temporary RAM to permanent RAM.\r
+\r
+  For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes \r
+  immediately preceding the Interrupt Descriptor Table (IDT) in memory.\r
+  For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes \r
+  immediately preceding the Interrupt Descriptor Table (IDT) in memory.\r
+  For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in\r
+  a dedicated CPU register.  This means that there is no memory storage \r
+  associated with storing the PEI Services Table pointer, so no additional \r
+  migration actions are required for Itanium or ARM CPUs.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+MigratePeiServicesTablePointer (\r
+  )\r
+{\r
+  return;\r
+}\r
+\r