1 /****************************************************************************** 2 * 3 * Module Name: exstorob - AML Interpreter object store support, store to object 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2015, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include <contrib/dev/acpica/include/acpi.h> 45 #include <contrib/dev/acpica/include/accommon.h> 46 #include <contrib/dev/acpica/include/acinterp.h> 47 48 49 #define _COMPONENT ACPI_EXECUTER 50 ACPI_MODULE_NAME ("exstorob") 51 52 53 /******************************************************************************* 54 * 55 * FUNCTION: AcpiExStoreBufferToBuffer 56 * 57 * PARAMETERS: SourceDesc - Source object to copy 58 * TargetDesc - Destination object of the copy 59 * 60 * RETURN: Status 61 * 62 * DESCRIPTION: Copy a buffer object to another buffer object. 63 * 64 ******************************************************************************/ 65 66 ACPI_STATUS 67 AcpiExStoreBufferToBuffer ( 68 ACPI_OPERAND_OBJECT *SourceDesc, 69 ACPI_OPERAND_OBJECT *TargetDesc) 70 { 71 UINT32 Length; 72 UINT8 *Buffer; 73 74 75 ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc); 76 77 78 /* If Source and Target are the same, just return */ 79 80 if (SourceDesc == TargetDesc) 81 { 82 return_ACPI_STATUS (AE_OK); 83 } 84 85 /* We know that SourceDesc is a buffer by now */ 86 87 Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer); 88 Length = SourceDesc->Buffer.Length; 89 90 /* 91 * If target is a buffer of length zero or is a static buffer, 92 * allocate a new buffer of the proper length 93 */ 94 if ((TargetDesc->Buffer.Length == 0) || 95 (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)) 96 { 97 TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length); 98 if (!TargetDesc->Buffer.Pointer) 99 { 100 return_ACPI_STATUS (AE_NO_MEMORY); 101 } 102 103 TargetDesc->Buffer.Length = Length; 104 } 105 106 /* Copy source buffer to target buffer */ 107 108 if (Length <= TargetDesc->Buffer.Length) 109 { 110 /* Clear existing buffer and copy in the new one */ 111 112 memset (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length); 113 memcpy (TargetDesc->Buffer.Pointer, Buffer, Length); 114 115 #ifdef ACPI_OBSOLETE_BEHAVIOR 116 /* 117 * NOTE: ACPI versions up to 3.0 specified that the buffer must be 118 * truncated if the string is smaller than the buffer. However, "other" 119 * implementations of ACPI never did this and thus became the defacto 120 * standard. ACPI 3.0A changes this behavior such that the buffer 121 * is no longer truncated. 122 */ 123 124 /* 125 * OBSOLETE BEHAVIOR: 126 * If the original source was a string, we must truncate the buffer, 127 * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer 128 * copy must not truncate the original buffer. 129 */ 130 if (OriginalSrcType == ACPI_TYPE_STRING) 131 { 132 /* Set the new length of the target */ 133 134 TargetDesc->Buffer.Length = Length; 135 } 136 #endif 137 } 138 else 139 { 140 /* Truncate the source, copy only what will fit */ 141 142 memcpy (TargetDesc->Buffer.Pointer, Buffer, 143 TargetDesc->Buffer.Length); 144 145 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 146 "Truncating source buffer from %X to %X\n", 147 Length, TargetDesc->Buffer.Length)); 148 } 149 150 /* Copy flags */ 151 152 TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags; 153 TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER; 154 return_ACPI_STATUS (AE_OK); 155 } 156 157 158 /******************************************************************************* 159 * 160 * FUNCTION: AcpiExStoreStringToString 161 * 162 * PARAMETERS: SourceDesc - Source object to copy 163 * TargetDesc - Destination object of the copy 164 * 165 * RETURN: Status 166 * 167 * DESCRIPTION: Copy a String object to another String object 168 * 169 ******************************************************************************/ 170 171 ACPI_STATUS 172 AcpiExStoreStringToString ( 173 ACPI_OPERAND_OBJECT *SourceDesc, 174 ACPI_OPERAND_OBJECT *TargetDesc) 175 { 176 UINT32 Length; 177 UINT8 *Buffer; 178 179 180 ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc); 181 182 183 /* If Source and Target are the same, just return */ 184 185 if (SourceDesc == TargetDesc) 186 { 187 return_ACPI_STATUS (AE_OK); 188 } 189 190 /* We know that SourceDesc is a string by now */ 191 192 Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer); 193 Length = SourceDesc->String.Length; 194 195 /* 196 * Replace existing string value if it will fit and the string 197 * pointer is not a static pointer (part of an ACPI table) 198 */ 199 if ((Length < TargetDesc->String.Length) && 200 (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))) 201 { 202 /* 203 * String will fit in existing non-static buffer. 204 * Clear old string and copy in the new one 205 */ 206 memset (TargetDesc->String.Pointer, 0, 207 (ACPI_SIZE) TargetDesc->String.Length + 1); 208 memcpy (TargetDesc->String.Pointer, Buffer, Length); 209 } 210 else 211 { 212 /* 213 * Free the current buffer, then allocate a new buffer 214 * large enough to hold the value 215 */ 216 if (TargetDesc->String.Pointer && 217 (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))) 218 { 219 /* Only free if not a pointer into the DSDT */ 220 221 ACPI_FREE (TargetDesc->String.Pointer); 222 } 223 224 TargetDesc->String.Pointer = ACPI_ALLOCATE_ZEROED ( 225 (ACPI_SIZE) Length + 1); 226 if (!TargetDesc->String.Pointer) 227 { 228 return_ACPI_STATUS (AE_NO_MEMORY); 229 } 230 231 TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER; 232 memcpy (TargetDesc->String.Pointer, Buffer, Length); 233 } 234 235 /* Set the new target length */ 236 237 TargetDesc->String.Length = Length; 238 return_ACPI_STATUS (AE_OK); 239 } 240