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1. Add new API MigratePeiServicesTablePointer() in PeiServicesTablePointerLib class.

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2. PeiCore will call this API to migrate the PEI Services Table pointer from temporary RAM to permanent RAM.

Signed-off-by: Gao, Liming <liming.gao@intel.com>
Reviewed-by: Kinney, Michael D <michael.d.kinney@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15114 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Gao, Liming
2014-01-15 02:16:57 +00:00
committed by lgao4
parent 2405af1993
commit ffdb421ca5
5 changed files with 120 additions and 42 deletions
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26
MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
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@@ -4,7 +4,7 @@
This library is used for PEIM which does executed from flash device directly but
executed in memory.
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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
@@ -88,4 +88,28 @@ PeiServicesTablePointerLibConstructor (
return EFI_SUCCESS;
}
/**
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 (
)
{
//
// PEI Services Table pointer is cached in the global variable. No additional
// migration actions are required.
//
return;
}