1 /** @file 2 * 3 * Copyright (c) 2011, ARM Limited. All rights reserved. 4 * (C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR> 5 * 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 "Ebl.h" 17 18 #include <Guid/GlobalVariable.h> 19 20 EFI_STATUS 21 EFIAPI 22 EblGetCmd ( 23 IN UINTN Argc, 24 IN CHAR8 **Argv 25 ) 26 { 27 EFI_STATUS Status = EFI_INVALID_PARAMETER; 28 UINTN Size; 29 VOID* Value; 30 CHAR8* AsciiVariableName = NULL; 31 CHAR16* VariableName; 32 UINT32 Index; 33 34 if (Argc == 1) { 35 AsciiPrint("Variable name is missing.\n"); 36 return Status; 37 } 38 39 for (Index = 1; Index < Argc; Index++) { 40 if (Argv[Index][0] == '-') { 41 AsciiPrint("Warning: '%a' not recognized.\n",Argv[Index]); 42 } else { 43 AsciiVariableName = Argv[Index]; 44 } 45 } 46 47 if (AsciiVariableName == NULL) { 48 AsciiPrint("Variable name is missing.\n"); 49 return Status; 50 } else { 51 VariableName = AllocatePool((AsciiStrLen (AsciiVariableName) + 1) * sizeof (CHAR16)); 52 AsciiStrToUnicodeStr (AsciiVariableName,VariableName); 53 } 54 55 // Try to get the variable size. 56 Value = NULL; 57 Size = 0; 58 Status = gRT->GetVariable (VariableName, &gEfiGlobalVariableGuid, NULL, &Size, Value); 59 if (Status == EFI_NOT_FOUND) { 60 AsciiPrint("Variable name '%s' not found.\n",VariableName); 61 } else if (Status == EFI_BUFFER_TOO_SMALL) { 62 // Get the environment variable value 63 Value = AllocatePool (Size); 64 if (Value == NULL) { 65 return EFI_OUT_OF_RESOURCES; 66 } 67 68 Status = gRT->GetVariable ((CHAR16 *)VariableName, &gEfiGlobalVariableGuid, NULL, &Size, Value); 69 if (EFI_ERROR (Status)) { 70 AsciiPrint("Error: '%r'\n",Status); 71 } else { 72 AsciiPrint("%a=%a\n",AsciiVariableName,Value); 73 } 74 FreePool(Value); 75 } else { 76 AsciiPrint("Error: '%r'\n",Status); 77 } 78 79 FreePool(VariableName); 80 return Status; 81 } 82 83 EFI_STATUS 84 EFIAPI 85 EblSetCmd ( 86 IN UINTN Argc, 87 IN CHAR8 **Argv 88 ) 89 { 90 EFI_STATUS Status = EFI_INVALID_PARAMETER; 91 CHAR8* AsciiVariableSetting = NULL; 92 CHAR8* AsciiVariableName; 93 CHAR8* AsciiValue; 94 UINT32 AsciiValueLength; 95 CHAR16* VariableName; 96 UINT32 Index; 97 UINT32 EscapedQuotes = 0; 98 BOOLEAN Volatile = FALSE; 99 100 if (Argc == 1) { 101 AsciiPrint("Variable name is missing.\n"); 102 return Status; 103 } 104 105 for (Index = 1; Index < Argc; Index++) { 106 if (AsciiStrCmp(Argv[Index],"-v") == 0) { 107 Volatile = 0; 108 } else if (Argv[Index][0] == '-') { 109 AsciiPrint("Warning: '%a' not recognized.\n",Argv[Index]); 110 } else { 111 AsciiVariableSetting = Argv[Index]; 112 } 113 } 114 115 if (AsciiVariableSetting == NULL) { 116 AsciiPrint("Variable name is missing.\n"); 117 return Status; 118 } 119 120 // Check if it is a valid variable setting 121 AsciiValue = AsciiStrStr (AsciiVariableSetting,"="); 122 if (AsciiValue == NULL) { 123 // 124 // There is no value. It means this variable will be deleted 125 // 126 127 // Convert VariableName into Unicode 128 VariableName = AllocatePool((AsciiStrLen (AsciiVariableSetting) + 1) * sizeof (CHAR16)); 129 AsciiStrToUnicodeStr (AsciiVariableSetting,VariableName); 130 131 Status = gRT->SetVariable ( 132 VariableName, 133 &gEfiGlobalVariableGuid, 134 ( !Volatile ? EFI_VARIABLE_NON_VOLATILE : 0) | 135 EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, 136 0, 137 NULL 138 ); 139 if (!EFI_ERROR(Status)) { 140 AsciiPrint("Variable '%s' deleted\n",VariableName); 141 } else { 142 AsciiPrint("Variable setting is incorrect. It should be VariableName=Value\n"); 143 } 144 return Status; 145 } 146 147 AsciiValue[0] = '\0'; 148 AsciiVariableName = AsciiVariableSetting; 149 AsciiValue++; 150 151 // Clean AsciiValue from quote 152 if (AsciiValue[0] == '"') { 153 AsciiValue++; 154 } 155 AsciiValueLength = AsciiStrLen (AsciiValue); 156 if ((AsciiValue[AsciiValueLength-2] != '\\') && (AsciiValue[AsciiValueLength-1] == '"')) { 157 AsciiValue[AsciiValueLength-1] = '\0'; 158 } 159 160 // Clean AsciiValue from escaped quotes 161 for (Index = 0; Index < AsciiValueLength; Index++) { 162 if ((Index > 0) && (AsciiValue[Index-1] == '\\') && (AsciiValue[Index] == '"')) { 163 EscapedQuotes++; 164 } 165 AsciiValue[Index-EscapedQuotes] = AsciiValue[Index]; 166 } 167 // Fill the end of the value with '\0' 168 for (Index = 0; Index < EscapedQuotes; Index++) { 169 AsciiValue[AsciiValueLength-1-Index] = '\0'; 170 } 171 172 // Convert VariableName into Unicode 173 VariableName = AllocatePool((AsciiStrLen (AsciiVariableName) + 1) * sizeof (CHAR16)); 174 AsciiStrToUnicodeStr (AsciiVariableName,VariableName); 175 176 Status = gRT->SetVariable ( 177 VariableName, 178 &gEfiGlobalVariableGuid, 179 ( !Volatile ? EFI_VARIABLE_NON_VOLATILE : 0) | 180 EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, 181 AsciiStrLen (AsciiValue)+1, 182 AsciiValue 183 ); 184 if (!EFI_ERROR(Status)) { 185 AsciiPrint("'%a'='%a'\n",AsciiVariableName,AsciiValue); 186 } 187 188 return Status; 189 } 190 191 GLOBAL_REMOVE_IF_UNREFERENCED const EBL_COMMAND_TABLE mCmdVariableTemplate[] = 192 { 193 { 194 "get", 195 " ; get UEFI variable\n\r [v]; verbose", 196 NULL, 197 EblGetCmd 198 }, 199 { 200 "set", 201 " ; set UEFI variable\n\r [v]; create volatile variable", 202 NULL, 203 EblSetCmd 204 } 205 }; 206 207 /** 208 Initialize the commands in this in this file 209 **/ 210 VOID 211 EblInitializeVariableCmds ( 212 VOID 213 ) 214 { 215 EblAddCommands (mCmdVariableTemplate, sizeof (mCmdVariableTemplate)/sizeof (EBL_COMMAND_TABLE)); 216 } 217
