From: Gao, Liming <liming.gao@intel.com>
Date: Wed, 15 Jan 2014 11:51:38 +0000 (+0000)
Subject: ArmPlatformPkg/PeiServicesTablePointerLib: Update PeiServicesTablePointerLib instance... 
X-Git-Tag: edk2-stable201903~11837
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=382e45e7fd04312e54affee81db2dd0a2be5d496;p=mirror_edk2.git

ArmPlatformPkg/PeiServicesTablePointerLib: Update PeiServicesTablePointerLib instance to add new API MigratePeiServicesTablePointer()

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gao, Liming <liming.gao@intel.com>
Reviewed-By: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15120 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/ArmPlatformPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c b/ArmPlatformPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
index cb0041f90d..8be91c000d 100644
--- a/ArmPlatformPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
+++ b/ArmPlatformPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
@@ -67,4 +67,24 @@ GetPeiServicesTablePointer (
   return (CONST EFI_PEI_SERVICES**)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;
+}