EmbeddedPkg/PrePiHobListPointerLib: New interface to abstract the HobListPointer storage

This interface allows to use different mechanism to store the HobList Pointer.


EmbeddedPkg/PrePiHobListPointerLib: Implementation of PrePiHobListPointerLib using PCD

This library uses a PCD to store the location of the HobList Pointer.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11947 6f19259b-4bc3-4df7-8a09-765794883524

EmbeddedPkg/Include/Library/PrePiHobListPointerLib.h

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+/** @file
+*
+*  Copyright (c) 2011, ARM Limited. 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.             
+*
+**/
+
+#ifndef __PREPI_HOBLIST_POINTER_LIB_H__
+#define __PREPI_HOBLIST_POINTER_LIB_H__
+
+/**
+  Returns the pointer to the HOB list.
+
+  This function returns the pointer to first HOB in the list.
+
+  @return The pointer to the HOB list.
+
+**/
+VOID *
+EFIAPI
+PrePeiGetHobList (
+  VOID
+  );
+
+/**
+  Updates the pointer to the HOB list.
+
+  @param  HobList       Hob list pointer to store
+  
+**/
+EFI_STATUS
+EFIAPI
+PrePeiSetHobList (
+  IN  VOID      *HobList
+  );
+
+#endif

EmbeddedPkg/Library/PrePiHobListPointerLib/PrePiHobListPointer.c

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+/** @file
+*
+*  Copyright (c) 2011, ARM Limited. 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.             
+*
+**/
+
+#include <PiPei.h>
+#include <Library/PrePiHobListPointerLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+
+//
+// Have to use build system to set the original value in case we are running
+// from FLASH and globals don't work. So if you do a GetHobList() and gHobList
+// and gHobList is NULL the PCD default values are used.
+//
+VOID *gHobList = NULL;
+
+
+/**
+  Returns the pointer to the HOB list.
+
+  This function returns the pointer to first HOB in the list.
+
+  @return The pointer to the HOB list.
+
+**/
+VOID *
+EFIAPI
+PrePeiGetHobList (
+  VOID
+  )
+{
+  if (gHobList == NULL) {
+    return (VOID *)*(UINTN*)PcdGet32 (PcdPrePiHobBase);
+  } else {
+    return gHobList;
+  }
+}
+
+
+
+/**
+  Updates the pointer to the HOB list.
+
+  @param  HobList       Hob list pointer to store
+  
+**/
+EFI_STATUS
+EFIAPI
+PrePeiSetHobList (
+  IN  VOID      *HobList
+  )
+{
+  gHobList = HobList;
+  
+  //
+  // If this code is running from ROM this could fail
+  //
+  return (gHobList == HobList) ? EFI_SUCCESS: EFI_UNSUPPORTED;
+}

EmbeddedPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf

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+#/** @file
+#
+#  Copyright (c) 2011, ARM Limited. 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.             
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = PrePiHobListPointerLib
+  FILE_GUID                      = 7a6a7fc0-5ee0-11e0-b47f-0002a5d5c51b
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PrePiHobListPointerLib
+
+#
+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC (EBC is for build only)
+#
+
+[Sources]
+  PrePiHobListPointer.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+
+[LibraryClasses]
+  #DebugLib
+  
+[FixedPcd.common]
+  gEmbeddedTokenSpaceGuid.PcdPrePiHobBase
+