1 /** @file 2 This module provide Hand-Off Block manupulation. 3 4 Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include "PeiMain.h" 16 17 /** 18 19 Gets the pointer to the HOB List. 20 21 @param PeiServices An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation. 22 @param HobList Pointer to the HOB List. 23 24 @retval EFI_SUCCESS Get the pointer of HOB List 25 @retval EFI_NOT_AVAILABLE_YET the HOB List is not yet published 26 @retval EFI_INVALID_PARAMETER HobList is NULL (in debug mode) 27 28 **/ 29 EFI_STATUS 30 EFIAPI 31 PeiGetHobList ( 32 IN CONST EFI_PEI_SERVICES **PeiServices, 33 IN OUT VOID **HobList 34 ) 35 { 36 PEI_CORE_INSTANCE *PrivateData; 37 38 // 39 // Only check this parameter in debug mode 40 // 41 42 DEBUG_CODE_BEGIN (); 43 if (HobList == NULL) { 44 return EFI_INVALID_PARAMETER; 45 } 46 DEBUG_CODE_END (); 47 48 PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices); 49 50 *HobList = PrivateData->HobList.Raw; 51 52 return EFI_SUCCESS; 53 } 54 55 56 /** 57 Add a new HOB to the HOB List. 58 59 @param PeiServices An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation. 60 @param Type Type of the new HOB. 61 @param Length Length of the new HOB to allocate. 62 @param Hob Pointer to the new HOB. 63 64 @return EFI_SUCCESS Success to create hob. 65 @retval EFI_INVALID_PARAMETER if Hob is NULL 66 @retval EFI_NOT_AVAILABLE_YET if HobList is still not available. 67 @retval EFI_OUT_OF_RESOURCES if there is no more memory to grow the Hoblist. 68 69 **/ 70 EFI_STATUS 71 EFIAPI 72 PeiCreateHob ( 73 IN CONST EFI_PEI_SERVICES **PeiServices, 74 IN UINT16 Type, 75 IN UINT16 Length, 76 IN OUT VOID **Hob 77 ) 78 { 79 EFI_STATUS Status; 80 EFI_HOB_HANDOFF_INFO_TABLE *HandOffHob; 81 EFI_HOB_GENERIC_HEADER *HobEnd; 82 EFI_PHYSICAL_ADDRESS FreeMemory; 83 84 85 Status = PeiGetHobList (PeiServices, Hob); 86 if (EFI_ERROR(Status)) { 87 return Status; 88 } 89 90 HandOffHob = *Hob; 91 92 // 93 // Check Length to avoid data overflow. 94 // 95 if (0x10000 - Length <= 0x7) { 96 return EFI_INVALID_PARAMETER; 97 } 98 Length = (UINT16)((Length + 0x7) & (~0x7)); 99 100 FreeMemory = HandOffHob->EfiFreeMemoryTop - 101 HandOffHob->EfiFreeMemoryBottom; 102 103 if (FreeMemory < Length) { 104 DEBUG ((EFI_D_ERROR, "PeiCreateHob fail: Length - 0x%08x\n", (UINTN)Length)); 105 DEBUG ((EFI_D_ERROR, " FreeMemoryTop - 0x%08x\n", (UINTN)HandOffHob->EfiFreeMemoryTop)); 106 DEBUG ((EFI_D_ERROR, " FreeMemoryBottom - 0x%08x\n", (UINTN)HandOffHob->EfiFreeMemoryBottom)); 107 return EFI_OUT_OF_RESOURCES; 108 } 109 110 *Hob = (VOID*) (UINTN) HandOffHob->EfiEndOfHobList; 111 ((EFI_HOB_GENERIC_HEADER*) *Hob)->HobType = Type; 112 ((EFI_HOB_GENERIC_HEADER*) *Hob)->HobLength = Length; 113 ((EFI_HOB_GENERIC_HEADER*) *Hob)->Reserved = 0; 114 115 HobEnd = (EFI_HOB_GENERIC_HEADER*) ((UINTN) *Hob + Length); 116 HandOffHob->EfiEndOfHobList = (EFI_PHYSICAL_ADDRESS) (UINTN) HobEnd; 117 118 HobEnd->HobType = EFI_HOB_TYPE_END_OF_HOB_LIST; 119 HobEnd->HobLength = (UINT16) sizeof (EFI_HOB_GENERIC_HEADER); 120 HobEnd->Reserved = 0; 121 HobEnd++; 122 HandOffHob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS) (UINTN) HobEnd; 123 124 return EFI_SUCCESS; 125 } 126 127 /** 128 129 Builds a Handoff Information Table HOB 130 131 @param BootMode - Current Bootmode 132 @param MemoryBegin - Start Memory Address. 133 @param MemoryLength - Length of Memory. 134 135 @return EFI_SUCCESS Always success to initialize HOB. 136 137 **/ 138 EFI_STATUS 139 PeiCoreBuildHobHandoffInfoTable ( 140 IN EFI_BOOT_MODE BootMode, 141 IN EFI_PHYSICAL_ADDRESS MemoryBegin, 142 IN UINT64 MemoryLength 143 ) 144 { 145 EFI_HOB_HANDOFF_INFO_TABLE *Hob; 146 EFI_HOB_GENERIC_HEADER *HobEnd; 147 148 Hob = (VOID *)(UINTN)MemoryBegin; 149 HobEnd = (EFI_HOB_GENERIC_HEADER*) (Hob+1); 150 Hob->Header.HobType = EFI_HOB_TYPE_HANDOFF; 151 Hob->Header.HobLength = (UINT16) sizeof (EFI_HOB_HANDOFF_INFO_TABLE); 152 Hob->Header.Reserved = 0; 153 154 HobEnd->HobType = EFI_HOB_TYPE_END_OF_HOB_LIST; 155 HobEnd->HobLength = (UINT16) sizeof (EFI_HOB_GENERIC_HEADER); 156 HobEnd->Reserved = 0; 157 158 Hob->Version = EFI_HOB_HANDOFF_TABLE_VERSION; 159 Hob->BootMode = BootMode; 160 161 Hob->EfiMemoryTop = MemoryBegin + MemoryLength; 162 Hob->EfiMemoryBottom = MemoryBegin; 163 Hob->EfiFreeMemoryTop = MemoryBegin + MemoryLength; 164 Hob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS) (UINTN) (HobEnd + 1); 165 Hob->EfiEndOfHobList = (EFI_PHYSICAL_ADDRESS) (UINTN) HobEnd; 166 167 return EFI_SUCCESS; 168 } 169
