From 382e45e7fd04312e54affee81db2dd0a2be5d496 Mon Sep 17 00:00:00 2001 From: "Gao, Liming" Date: Wed, 15 Jan 2014 11:51:38 +0000 Subject: [PATCH 1/1] ArmPlatformPkg/PeiServicesTablePointerLib: Update PeiServicesTablePointerLib instance to add new API MigratePeiServicesTablePointer() Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Gao, Liming Reviewed-By: Olivier Martin git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15120 6f19259b-4bc3-4df7-8a09-765794883524 --- .../PeiServicesTablePointer.c | 20 +++++++++++++++++++ 1 file changed, 20 insertions(+) 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; +} -- 2.39.2