1 /** @file 2 System Management System Table Services SmmInstallConfigurationTable service 3 4 Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials are licensed and made available 6 under the terms and conditions of the BSD License which accompanies this 7 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 "PiSmmCore.h" 16 17 #define CONFIG_TABLE_SIZE_INCREASED 0x10 18 19 UINTN mSmmSystemTableAllocateSize = 0; 20 21 /** 22 The SmmInstallConfigurationTable() function is used to maintain the list 23 of configuration tables that are stored in the System Management System 24 Table. The list is stored as an array of (GUID, Pointer) pairs. The list 25 must be allocated from pool memory with PoolType set to EfiRuntimeServicesData. 26 27 @param SystemTable A pointer to the SMM System Table (SMST). 28 @param Guid A pointer to the GUID for the entry to add, update, or remove. 29 @param Table A pointer to the buffer of the table to add. 30 @param TableSize The size of the table to install. 31 32 @retval EFI_SUCCESS The (Guid, Table) pair was added, updated, or removed. 33 @retval EFI_INVALID_PARAMETER Guid is not valid. 34 @retval EFI_NOT_FOUND An attempt was made to delete a non-existent entry. 35 @retval EFI_OUT_OF_RESOURCES There is not enough memory available to complete the operation. 36 37 **/ 38 EFI_STATUS 39 EFIAPI 40 SmmInstallConfigurationTable ( 41 IN CONST EFI_SMM_SYSTEM_TABLE2 *SystemTable, 42 IN CONST EFI_GUID *Guid, 43 IN VOID *Table, 44 IN UINTN TableSize 45 ) 46 { 47 UINTN Index; 48 EFI_CONFIGURATION_TABLE *ConfigurationTable; 49 50 // 51 // If Guid is NULL, then this operation cannot be performed 52 // 53 if (Guid == NULL) { 54 return EFI_INVALID_PARAMETER; 55 } 56 57 ConfigurationTable = gSmmCoreSmst.SmmConfigurationTable; 58 59 // 60 // Search all the table for an entry that matches Guid 61 // 62 for (Index = 0; Index < gSmmCoreSmst.NumberOfTableEntries; Index++) { 63 if (CompareGuid (Guid, &(ConfigurationTable[Index].VendorGuid))) { 64 break; 65 } 66 } 67 68 if (Index < gSmmCoreSmst.NumberOfTableEntries) { 69 // 70 // A match was found, so this is either a modify or a delete operation 71 // 72 if (Table != NULL) { 73 // 74 // If Table is not NULL, then this is a modify operation. 75 // Modify the table enty and return. 76 // 77 ConfigurationTable[Index].VendorTable = Table; 78 return EFI_SUCCESS; 79 } 80 81 // 82 // A match was found and Table is NULL, so this is a delete operation. 83 // 84 gSmmCoreSmst.NumberOfTableEntries--; 85 86 // 87 // Copy over deleted entry 88 // 89 CopyMem ( 90 &(ConfigurationTable[Index]), 91 &(ConfigurationTable[Index + 1]), 92 (gSmmCoreSmst.NumberOfTableEntries - Index) * sizeof (EFI_CONFIGURATION_TABLE) 93 ); 94 95 } else { 96 // 97 // No matching GUIDs were found, so this is an add operation. 98 // 99 if (Table == NULL) { 100 // 101 // If Table is NULL on an add operation, then return an error. 102 // 103 return EFI_NOT_FOUND; 104 } 105 106 // 107 // Assume that Index == gSmmCoreSmst.NumberOfTableEntries 108 // 109 if ((Index * sizeof (EFI_CONFIGURATION_TABLE)) >= mSmmSystemTableAllocateSize) { 110 // 111 // Allocate a table with one additional entry. 112 // 113 mSmmSystemTableAllocateSize += (CONFIG_TABLE_SIZE_INCREASED * sizeof (EFI_CONFIGURATION_TABLE)); 114 ConfigurationTable = AllocatePool (mSmmSystemTableAllocateSize); 115 if (ConfigurationTable == NULL) { 116 // 117 // If a new table could not be allocated, then return an error. 118 // 119 return EFI_OUT_OF_RESOURCES; 120 } 121 122 if (gSmmCoreSmst.SmmConfigurationTable != NULL) { 123 // 124 // Copy the old table to the new table. 125 // 126 CopyMem ( 127 ConfigurationTable, 128 gSmmCoreSmst.SmmConfigurationTable, 129 Index * sizeof (EFI_CONFIGURATION_TABLE) 130 ); 131 132 // 133 // Free Old Table 134 // 135 FreePool (gSmmCoreSmst.SmmConfigurationTable); 136 } 137 138 // 139 // Update System Table 140 // 141 gSmmCoreSmst.SmmConfigurationTable = ConfigurationTable; 142 } 143 144 // 145 // Fill in the new entry 146 // 147 CopyGuid ((VOID *)&ConfigurationTable[Index].VendorGuid, Guid); 148 ConfigurationTable[Index].VendorTable = Table; 149 150 // 151 // This is an add operation, so increment the number of table entries 152 // 153 gSmmCoreSmst.NumberOfTableEntries++; 154 } 155 156 // 157 // CRC-32 field is ignorable for SMM System Table and should be set to zero 158 // 159 160 return EFI_SUCCESS; 161 } 162
