1 /** @file 2 PEI Services Table Pointer Library implementation for IPF that uses Kernel 3 Register 7 to store the pointer. 4 5 Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR> 6 This program and the accompanying materials 7 are licensed and made available under the terms and conditions of the BSD License 8 which accompanies this distribution. The full text of the license may be found at 9 http://opensource.org/licenses/bsd-license.php. 10 11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 13 14 **/ 15 16 #include <PiPei.h> 17 #include <Library/BaseLib.h> 18 #include <Library/DebugLib.h> 19 20 /** 21 Retrieves the cached value of the PEI Services Table pointer. 22 23 Returns the cached value of the PEI Services Table pointer in a CPU specific manner 24 as specified in the CPU binding section of the Platform Initialization Pre-EFI 25 Initialization Core Interface Specification. 26 27 If the cached PEI Services Table pointer is NULL, then ASSERT(). 28 29 @return The pointer to PeiServices. 30 31 **/ 32 CONST EFI_PEI_SERVICES ** 33 EFIAPI 34 GetPeiServicesTablePointer ( 35 VOID 36 ) 37 { 38 CONST EFI_PEI_SERVICES **PeiServices; 39 40 PeiServices = (CONST EFI_PEI_SERVICES **)(UINTN)AsmReadKr7 (); 41 ASSERT (PeiServices != NULL); 42 return PeiServices; 43 } 44 45 46 /** 47 Caches a pointer PEI Services Table. 48 49 Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer 50 in a CPU specific manner as specified in the CPU binding section of the Platform Initialization 51 Pre-EFI Initialization Core Interface Specification. 52 The function set the pointer of PEI services in KR7 register 53 according to PI specification. 54 55 If PeiServicesTablePointer is NULL, then ASSERT(). 56 57 @param PeiServicesTablePointer The address of PeiServices pointer. 58 **/ 59 VOID 60 EFIAPI 61 SetPeiServicesTablePointer ( 62 IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer 63 ) 64 { 65 ASSERT (PeiServicesTablePointer != NULL); 66 AsmWriteKr7 ((UINT64)(UINTN)PeiServicesTablePointer); 67 } 68 69 /** 70 Perform CPU specific actions required to migrate the PEI Services Table 71 pointer from temporary RAM to permanent RAM. 72 73 For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes 74 immediately preceding the Interrupt Descriptor Table (IDT) in memory. 75 For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes 76 immediately preceding the Interrupt Descriptor Table (IDT) in memory. 77 For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in 78 a dedicated CPU register. This means that there is no memory storage 79 associated with storing the PEI Services Table pointer, so no additional 80 migration actions are required for Itanium or ARM CPUs. 81 82 **/ 83 VOID 84 EFIAPI 85 MigratePeiServicesTablePointer ( 86 VOID 87 ) 88 { 89 return; 90 } 91 92
