1 /** @file 2 PEI Services Table Pointer Library. 3 4 This library is used for PEIM which does executed from flash device directly but 5 executed in memory. 6 7 Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR> 8 Copyright (c) 2011 Hewlett-Packard Corporation. All rights reserved.<BR> 9 This program and the accompanying materials 10 are licensed and made available under the terms and conditions of the BSD License 11 which accompanies this distribution. The full text of the license may be found at 12 http://opensource.org/licenses/bsd-license.php. 13 14 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 15 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 16 17 **/ 18 19 #include <PiPei.h> 20 #include <Library/PeiServicesTablePointerLib.h> 21 #include <Library/ArmLib.h> 22 #include <Library/DebugLib.h> 23 24 /** 25 Caches a pointer PEI Services Table. 26 27 Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer 28 in a platform specific manner. 29 30 If PeiServicesTablePointer is NULL, then ASSERT(). 31 32 @param PeiServicesTablePointer The address of PeiServices pointer. 33 **/ 34 VOID 35 EFIAPI 36 SetPeiServicesTablePointer ( 37 IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer 38 ) 39 { 40 ArmWriteTpidrurw((UINTN)PeiServicesTablePointer); 41 } 42 43 /** 44 Retrieves the cached value of the PEI Services Table pointer. 45 46 Returns the cached value of the PEI Services Table pointer in a CPU specific manner 47 as specified in the CPU binding section of the Platform Initialization Pre-EFI 48 Initialization Core Interface Specification. 49 50 If the cached PEI Services Table pointer is NULL, then ASSERT(). 51 52 @return The pointer to PeiServices. 53 54 **/ 55 CONST EFI_PEI_SERVICES ** 56 EFIAPI 57 GetPeiServicesTablePointer ( 58 VOID 59 ) 60 { 61 return (CONST EFI_PEI_SERVICES **)ArmReadTpidrurw(); 62 } 63 64 /** 65 Perform CPU specific actions required to migrate the PEI Services Table 66 pointer from temporary RAM to permanent RAM. 67 68 For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes 69 immediately preceding the Interrupt Descriptor Table (IDT) in memory. 70 For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes 71 immediately preceding the Interrupt Descriptor Table (IDT) in memory. 72 For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in 73 a dedicated CPU register. This means that there is no memory storage 74 associated with storing the PEI Services Table pointer, so no additional 75 migration actions are required for Itanium or ARM CPUs. 76 77 **/ 78 VOID 79 EFIAPI 80 MigratePeiServicesTablePointer( 81 VOID 82 ) 83 { 84 return; 85 } 86
