X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=MdePkg%2FLibrary%2FPeiServicesTablePointerLibKr7%2FPeiServicesTablePointer.c;h=5da6e1d7578223b16bf7f1727bcdadd831ff6932;hp=160e55302997f2197030f81b13e2625687d4e14b;hb=ffdb421ca50c3bb4b31f89707da4c99ca8299a77;hpb=d5b86e43cf23787da85fcf862807c1f6714bfac2

diff --git a/MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c b/MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c
index 160e553029..5da6e1d757 100644
--- a/MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c
+++ b/MdePkg/Library/PeiServicesTablePointerLibKr7/PeiServicesTablePointer.c
@@ -1,41 +1,90 @@
-/*++
+/** @file
+  PEI Services Table Pointer Library implementation for IPF that uses Kernel
+  Register 7 to store the pointer.
 
-Copyright (c) 2006 Intel Corporation. All rights reserved
-This software and associated documentation (if any) is furnished
-under a license and may only be used or copied in accordance
-with the terms of the license. Except as permitted by such
-license, no part of this software or documentation may be
-reproduced, stored in a retrieval system, or transmitted in any
-form or by any means without the express written consent of
-Intel Corporation.
+  Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+  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.
 
+**/
 
-  PEI Services Table Pointer Library.
-  
---*/
-
+#include <PiPei.h>
 #include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
 
 /**
-  The function returns the pointer to PeiServices.
+  Retrieves the cached value of the PEI Services Table pointer.
 
-  The function returns the pointer to PeiServices.
-  It will ASSERT() if the pointer to PeiServices is NULL.
+  Returns the cached value of the PEI Services Table pointer in a CPU specific manner 
+  as specified in the CPU binding section of the Platform Initialization Pre-EFI 
+  Initialization Core Interface Specification.
+  
+  If the cached PEI Services Table pointer is NULL, then ASSERT().
 
-  @retval  The pointer to PeiServices.
+  @return  The pointer to PeiServices.
 
 **/
-EFI_PEI_SERVICES **
+CONST EFI_PEI_SERVICES **
 EFIAPI
 GetPeiServicesTablePointer (
   VOID
   )
 {
-  EFI_PEI_SERVICES  **PeiServices;
+  CONST EFI_PEI_SERVICES  **PeiServices;
 
-  PeiServices = (EFI_PEI_SERVICES **)(UINTN)AsmReadKr7 ();
+  PeiServices = (CONST EFI_PEI_SERVICES **)(UINTN)AsmReadKr7 ();
   ASSERT (PeiServices != NULL);
   return PeiServices;
 }
 
+
+/**
+  Caches a pointer PEI Services Table. 
+ 
+  Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer 
+  in a CPU specific manner as specified in the CPU binding section of the Platform Initialization 
+  Pre-EFI Initialization Core Interface Specification. 
+  The function set the pointer of PEI services in KR7 register 
+  according to PI specification.
+  
+  If PeiServicesTablePointer is NULL, then ASSERT().
+  
+  @param    PeiServicesTablePointer   The address of PeiServices pointer.
+**/
+VOID
+EFIAPI
+SetPeiServicesTablePointer (
+  IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
+  )
+{
+  ASSERT (PeiServicesTablePointer != NULL);
+  AsmWriteKr7 ((UINT64)(UINTN)PeiServicesTablePointer);
+}
+  
+/**
+  Perform CPU specific actions required to migrate the PEI Services Table 
+  pointer from temporary RAM to permanent RAM.
+
+  For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes 
+  immediately preceding the Interrupt Descriptor Table (IDT) in memory.
+  For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes 
+  immediately preceding the Interrupt Descriptor Table (IDT) in memory.
+  For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in
+  a dedicated CPU register.  This means that there is no memory storage 
+  associated with storing the PEI Services Table pointer, so no additional 
+  migration actions are required for Itanium or ARM CPUs.
+
+**/
+VOID
+EFIAPI
+MigratePeiServicesTablePointer (
+  )
+{
+  return;
+}
+