/** @file | |
PEI Services Table Pointer Library implementation for IPF that uses Kernel | |
Register 7 to store the pointer. | |
Copyright (c) 2006 - 2018, 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 | |
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/BaseLib.h> | |
#include <Library/DebugLib.h> | |
/** | |
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 | |
) | |
{ | |
CONST EFI_PEI_SERVICES **PeiServices; | |
PeiServices = (CONST EFI_PEI_SERVICES **)(UINTN)AsmReadKr7 (); | |
ASSERT (PeiServices != NULL); | |
return PeiServices; | |
} | |
/** | |
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 in KR7 register | |
according to PI specification. | |
If PeiServicesTablePointer is NULL, then ASSERT(). | |
@param PeiServicesTablePointer The address of PeiServices pointer. | |
**/ | |
VOID | |
EFIAPI | |
SetPeiServicesTablePointer ( | |
IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer | |
) | |
{ | |
ASSERT (PeiServicesTablePointer != NULL); | |
AsmWriteKr7 ((UINT64)(UINTN)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 ( | |
VOID | |
) | |
{ | |
return; | |
} | |