mirror of https://github.com/acidanthera/audk.git
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/** @file
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PEI Services Table Pointer Library.
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This library is used for PEIM which does executed from flash device directly but
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executed in memory.
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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Portiions copyrigth (c) 2011, Apple Inc. All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiPei.h>
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#include <Library/PeiServicesTablePointerLib.h>
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#include <Library/DebugLib.h>
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#include <Ppi/MemoryDiscovered.h>
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CONST EFI_PEI_SERVICES **gPeiServices = NULL;
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/**
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Caches a pointer PEI Services Table.
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Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
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in a CPU specific manner as specified in the CPU binding section of the Platform Initialization
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Pre-EFI Initialization Core Interface Specification.
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If PeiServicesTablePointer is NULL, then ASSERT().
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@param PeiServicesTablePointer The address of PeiServices pointer.
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**/
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VOID
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EFIAPI
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SetPeiServicesTablePointer (
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IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
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)
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{
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ASSERT (PeiServicesTablePointer != NULL);
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ASSERT (*PeiServicesTablePointer != NULL);
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gPeiServices = PeiServicesTablePointer;
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}
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/**
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Retrieves the cached value of the PEI Services Table pointer.
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Returns the cached value of the PEI Services Table pointer in a CPU specific manner
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as specified in the CPU binding section of the Platform Initialization Pre-EFI
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Initialization Core Interface Specification.
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If the cached PEI Services Table pointer is NULL, then ASSERT().
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@return The pointer to PeiServices.
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**/
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CONST EFI_PEI_SERVICES **
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EFIAPI
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GetPeiServicesTablePointer (
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VOID
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)
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{
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ASSERT (gPeiServices != NULL);
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ASSERT (*gPeiServices != NULL);
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return gPeiServices;
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}
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/**
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Notification service to be called when gEmuThunkPpiGuid is installed.
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@param PeiServices Indirect reference to the PEI Services Table.
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@param NotifyDescriptor Address of the notification descriptor data structure. Type
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EFI_PEI_NOTIFY_DESCRIPTOR is defined above.
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@param Ppi Address of the PPI that was installed.
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@retval EFI_STATUS This function will install a PPI to PPI database. The status
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code will be the code for (*PeiServices)->InstallPpi.
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**/
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EFI_STATUS
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EFIAPI
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PeiServicesTablePointerNotifyCallback (
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IN EFI_PEI_SERVICES **PeiServices,
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IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDescriptor,
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IN VOID *Ppi
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)
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{
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gPeiServices = (CONST EFI_PEI_SERVICES **)PeiServices;
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return EFI_SUCCESS;
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}
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EFI_PEI_NOTIFY_DESCRIPTOR mNotifyOnThunkList = {
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(EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
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&gEfiPeiMemoryDiscoveredPpiGuid,
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PeiServicesTablePointerNotifyCallback
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};
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/**
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Constructor register notification on when PPI updates. If PPI is
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alreay installed registering the notify will cause the handle to
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run.
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@param FileHandle The handle of FFS header the loaded driver.
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@param PeiServices The pointer to the PEI services.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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PeiServicesTablePointerLibConstructor (
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IN EFI_PEI_FILE_HANDLE FileHandle,
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IN CONST EFI_PEI_SERVICES **PeiServices
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)
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{
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EFI_STATUS Status;
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gPeiServices = (CONST EFI_PEI_SERVICES **)PeiServices;
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// register to be told when PeiServices pointer is updated
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Status = (*PeiServices)->NotifyPpi (PeiServices, &mNotifyOnThunkList);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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