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PeiServicesTablePointerLib.h File Reference

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Functions

CONST EFI_PEI_SERVICES **EFIAPI GetPeiServicesTablePointer (VOID)
 
VOID EFIAPI SetPeiServicesTablePointer (IN CONST EFI_PEI_SERVICES **PeiServicesTablePointer)
 
VOID EFIAPI MigratePeiServicesTablePointer (VOID)
 

Detailed Description

Provides a service to retrieve a pointer to the PEI Services Table.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file PeiServicesTablePointerLib.h.

Function Documentation

◆ GetPeiServicesTablePointer()

CONST EFI_PEI_SERVICES **EFIAPI GetPeiServicesTablePointer ( VOID  )

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().

Returns
The pointer to PeiServices.

Definition at line 51 of file PeiServicesTablePointer.c.

◆ MigratePeiServicesTablePointer()

VOID EFIAPI MigratePeiServicesTablePointer ( VOID  )

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.

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.

If The cached PEI Services Table pointer is NULL, then ASSERT(). If the permanent memory is allocated failed, then ASSERT().

Definition at line 74 of file PeiServicesTablePointer.c.

◆ SetPeiServicesTablePointer()

VOID EFIAPI SetPeiServicesTablePointer ( IN CONST EFI_PEI_SERVICES **  PeiServicesTablePointer)

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().

Parameters
PeiServicesTablePointerThe address of PeiServices pointer.

Caches a pointer PEI Services Table.

Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer in a platform specific manner.

If PeiServicesTablePointer is NULL, then ASSERT().

Parameters
PeiServicesTablePointerThe address of PeiServices pointer.

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. The function set the pointer of PEI services immediately preceding the IDT table according to PI specification.

If PeiServicesTablePointer is NULL, then ASSERT().

Parameters
PeiServicesTablePointerThe address of PeiServices pointer.

Definition at line 30 of file PeiServicesTablePointer.c.