From 3c4b742c182785b0e3ae0217a8e3a08b47b5c7a8 Mon Sep 17 00:00:00 2001
From: oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 1 Jul 2011 15:45:52 +0000
Subject: ArmPlatformPkg/PrePiHobListPointerLib: Get the HobListPointer from
 the stop of the stack

When using ArmPlatformPkg/PrePeiCore or ArmPlatformPkg/PrePi, the global variable during
the XIP phase are stored on the top of the stack.
Global variables are defined by their PCD offset from the top of this stack.

For example, the HobListPtr is defined at the offset PcdHobListPtrGlobalOffset.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11958 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../PrePiHobListPointerLib/PrePiHobListPointer.c   | 69 ++++++++++++++++++++++
 .../PrePiHobListPointerLib.inf                     | 37 ++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100755 ArmPlatformPkg/Library/PrePiHobListPointerLib/PrePiHobListPointer.c
 create mode 100755 ArmPlatformPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf

diff --git a/ArmPlatformPkg/Library/PrePiHobListPointerLib/PrePiHobListPointer.c b/ArmPlatformPkg/Library/PrePiHobListPointerLib/PrePiHobListPointer.c
new file mode 100755
index 0000000..dfcc27e
--- /dev/null
+++ b/ArmPlatformPkg/Library/PrePiHobListPointerLib/PrePiHobListPointer.c
@@ -0,0 +1,69 @@
+/** @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 (PcdCPUCoresNonSecStackBase) + (PcdGet32 (PcdCPUCoresNonSecStackSize) / 2) - PcdGet32 (PcdHobListPtrGlobalOffset));
+  } 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;
+}
diff --git a/ArmPlatformPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf b/ArmPlatformPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf
new file mode 100755
index 0000000..5142f19
--- /dev/null
+++ b/ArmPlatformPkg/Library/PrePiHobListPointerLib/PrePiHobListPointerLib.inf
@@ -0,0 +1,37 @@
+#/** @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                      = d751d880-5ee2-11e0-b93e-0002a5d5c51b
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PrePiHobListPointerLib
+
+[Sources]
+  PrePiHobListPointer.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  ArmPlatformPkg/ArmPlatformPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+
+[LibraryClasses]
+  
+[FixedPcd.common]
+  gArmPlatformTokenSpaceGuid.PcdHobListPtrGlobalOffset
+  gArmPlatformTokenSpaceGuid.PcdCPUCoresNonSecStackBase
+  gArmPlatformTokenSpaceGuid.PcdCPUCoresNonSecStackSize
+  
\ No newline at end of file
-- 
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