mirror of https://github.com/acidanthera/audk.git
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/** @file
|
|
PEI Services Table Pointer Library for PEI Core.
|
|
|
|
This library is used for PEI Core which does executed from flash device directly but
|
|
executed in memory. When the PEI Core does a Set of the PEI Service table pointer
|
|
a PPI is reinstalled so that PEIMs can update the copy of the PEI Services table
|
|
they have cached.
|
|
|
|
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
|
|
Portiions copyrigth (c) 2011, Apple Inc. 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/PeiServicesTablePointerLib.h>
|
|
#include <Library/DebugLib.h>
|
|
|
|
#include <Ppi/EmuPeiServicesTableUpdate.h>
|
|
|
|
|
|
CONST EFI_PEI_SERVICES **gPeiServices = NULL;
|
|
|
|
/**
|
|
Caches a pointer PEI Services Table.
|
|
|
|
Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
|
|
in a CPU specific manner as specified in the CPU binding section of the Platform Initialization
|
|
Pre-EFI Initialization Core Interface Specification.
|
|
|
|
If PeiServicesTablePointer is NULL, then ASSERT().
|
|
|
|
@param PeiServicesTablePointer The address of PeiServices pointer.
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
SetPeiServicesTablePointer (
|
|
IN CONST EFI_PEI_SERVICES **PeiServicesTablePointer
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
EFI_PEI_PPI_DESCRIPTOR *PpiDescriptor;
|
|
VOID *NotUsed;
|
|
|
|
gPeiServices = PeiServicesTablePointer;
|
|
|
|
Status = (*PeiServicesTablePointer)->LocatePpi (
|
|
PeiServicesTablePointer,
|
|
&gEmuPeiServicesTableUpdatePpiGuid, // GUID
|
|
0, // INSTANCE
|
|
&PpiDescriptor, // EFI_PEI_PPI_DESCRIPTOR
|
|
&NotUsed // PPI
|
|
);
|
|
if (!EFI_ERROR (Status)) {
|
|
//
|
|
// Standard PI Mechanism is to use negative offset from IDT.
|
|
// We can't do that in the emulator, so we make up a constant location
|
|
// that every one can use. The first try may fail as the PEI Core is still
|
|
// initializing its self, but that is OK.
|
|
//
|
|
|
|
// Reinstall PPI to consumers know to update PEI Services pointer
|
|
Status = (*PeiServicesTablePointer)->ReInstallPpi (
|
|
PeiServicesTablePointer,
|
|
PpiDescriptor,
|
|
PpiDescriptor
|
|
);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
Retrieves the cached value of the PEI Services Table pointer.
|
|
|
|
Returns the cached value of the PEI Services Table pointer in a CPU specific manner
|
|
as specified in the CPU binding section of the Platform Initialization Pre-EFI
|
|
Initialization Core Interface Specification.
|
|
|
|
If the cached PEI Services Table pointer is NULL, then ASSERT().
|
|
|
|
@return The pointer to PeiServices.
|
|
|
|
**/
|
|
CONST EFI_PEI_SERVICES **
|
|
EFIAPI
|
|
GetPeiServicesTablePointer (
|
|
VOID
|
|
)
|
|
{
|
|
ASSERT (gPeiServices != NULL);
|
|
ASSERT (*gPeiServices != NULL);
|
|
return gPeiServices;
|
|
}
|
|
|
|
|