1 /****************************************************************************** 2 * 3 * Module Name: exstorob - AML object store support, store to object 4 * 5 *****************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include "acpi.h" 153 #include "accommon.h" 154 #include "acinterp.h" 155 156 157 #define _COMPONENT ACPI_EXECUTER 158 ACPI_MODULE_NAME ("exstorob") 159 160 161 /******************************************************************************* 162 * 163 * FUNCTION: AcpiExStoreBufferToBuffer 164 * 165 * PARAMETERS: SourceDesc - Source object to copy 166 * TargetDesc - Destination object of the copy 167 * 168 * RETURN: Status 169 * 170 * DESCRIPTION: Copy a buffer object to another buffer object. 171 * 172 ******************************************************************************/ 173 174 ACPI_STATUS 175 AcpiExStoreBufferToBuffer ( 176 ACPI_OPERAND_OBJECT *SourceDesc, 177 ACPI_OPERAND_OBJECT *TargetDesc) 178 { 179 UINT32 Length; 180 UINT8 *Buffer; 181 182 183 ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc); 184 185 186 /* If Source and Target are the same, just return */ 187 188 if (SourceDesc == TargetDesc) 189 { 190 return_ACPI_STATUS (AE_OK); 191 } 192 193 /* We know that SourceDesc is a buffer by now */ 194 195 Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer); 196 Length = SourceDesc->Buffer.Length; 197 198 /* 199 * If target is a buffer of length zero or is a static buffer, 200 * allocate a new buffer of the proper length 201 */ 202 if ((TargetDesc->Buffer.Length == 0) || 203 (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)) 204 { 205 TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length); 206 if (!TargetDesc->Buffer.Pointer) 207 { 208 return_ACPI_STATUS (AE_NO_MEMORY); 209 } 210 211 TargetDesc->Buffer.Length = Length; 212 } 213 214 /* Copy source buffer to target buffer */ 215 216 if (Length <= TargetDesc->Buffer.Length) 217 { 218 /* Clear existing buffer and copy in the new one */ 219 220 memset (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length); 221 memcpy (TargetDesc->Buffer.Pointer, Buffer, Length); 222 223 #ifdef ACPI_OBSOLETE_BEHAVIOR 224 /* 225 * NOTE: ACPI versions up to 3.0 specified that the buffer must be 226 * truncated if the string is smaller than the buffer. However, "other" 227 * implementations of ACPI never did this and thus became the defacto 228 * standard. ACPI 3.0A changes this behavior such that the buffer 229 * is no longer truncated. 230 */ 231 232 /* 233 * OBSOLETE BEHAVIOR: 234 * If the original source was a string, we must truncate the buffer, 235 * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer 236 * copy must not truncate the original buffer. 237 */ 238 if (OriginalSrcType == ACPI_TYPE_STRING) 239 { 240 /* Set the new length of the target */ 241 242 TargetDesc->Buffer.Length = Length; 243 } 244 #endif 245 } 246 else 247 { 248 /* Truncate the source, copy only what will fit */ 249 250 memcpy (TargetDesc->Buffer.Pointer, Buffer, 251 TargetDesc->Buffer.Length); 252 253 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 254 "Truncating source buffer from %X to %X\n", 255 Length, TargetDesc->Buffer.Length)); 256 } 257 258 /* Copy flags */ 259 260 TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags; 261 TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER; 262 return_ACPI_STATUS (AE_OK); 263 } 264 265 266 /******************************************************************************* 267 * 268 * FUNCTION: AcpiExStoreStringToString 269 * 270 * PARAMETERS: SourceDesc - Source object to copy 271 * TargetDesc - Destination object of the copy 272 * 273 * RETURN: Status 274 * 275 * DESCRIPTION: Copy a String object to another String object 276 * 277 ******************************************************************************/ 278 279 ACPI_STATUS 280 AcpiExStoreStringToString ( 281 ACPI_OPERAND_OBJECT *SourceDesc, 282 ACPI_OPERAND_OBJECT *TargetDesc) 283 { 284 UINT32 Length; 285 UINT8 *Buffer; 286 287 288 ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc); 289 290 291 /* If Source and Target are the same, just return */ 292 293 if (SourceDesc == TargetDesc) 294 { 295 return_ACPI_STATUS (AE_OK); 296 } 297 298 /* We know that SourceDesc is a string by now */ 299 300 Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer); 301 Length = SourceDesc->String.Length; 302 303 /* 304 * Replace existing string value if it will fit and the string 305 * pointer is not a static pointer (part of an ACPI table) 306 */ 307 if ((Length < TargetDesc->String.Length) && 308 (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))) 309 { 310 /* 311 * String will fit in existing non-static buffer. 312 * Clear old string and copy in the new one 313 */ 314 memset (TargetDesc->String.Pointer, 0, 315 (ACPI_SIZE) TargetDesc->String.Length + 1); 316 memcpy (TargetDesc->String.Pointer, Buffer, Length); 317 } 318 else 319 { 320 /* 321 * Free the current buffer, then allocate a new buffer 322 * large enough to hold the value 323 */ 324 if (TargetDesc->String.Pointer && 325 (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))) 326 { 327 /* Only free if not a pointer into the DSDT */ 328 329 ACPI_FREE (TargetDesc->String.Pointer); 330 } 331 332 TargetDesc->String.Pointer = 333 ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1); 334 335 if (!TargetDesc->String.Pointer) 336 { 337 return_ACPI_STATUS (AE_NO_MEMORY); 338 } 339 340 TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER; 341 memcpy (TargetDesc->String.Pointer, Buffer, Length); 342 } 343 344 /* Set the new target length */ 345 346 TargetDesc->String.Length = Length; 347 return_ACPI_STATUS (AE_OK); 348 } 349