1 /******************************************************************************* 2 * 3 * Module Name: utownerid - Support for Table/Method Owner IDs 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 "acnamesp.h" 155 156 157 #define _COMPONENT ACPI_UTILITIES 158 ACPI_MODULE_NAME ("utownerid") 159 160 161 /******************************************************************************* 162 * 163 * FUNCTION: AcpiUtAllocateOwnerId 164 * 165 * PARAMETERS: OwnerId - Where the new owner ID is returned 166 * 167 * RETURN: Status 168 * 169 * DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to 170 * track objects created by the table or method, to be deleted 171 * when the method exits or the table is unloaded. 172 * 173 ******************************************************************************/ 174 175 ACPI_STATUS 176 AcpiUtAllocateOwnerId ( 177 ACPI_OWNER_ID *OwnerId) 178 { 179 UINT32 i; 180 UINT32 j; 181 UINT32 k; 182 ACPI_STATUS Status; 183 184 185 ACPI_FUNCTION_TRACE (UtAllocateOwnerId); 186 187 188 /* Guard against multiple allocations of ID to the same location */ 189 190 if (*OwnerId) 191 { 192 ACPI_ERROR ((AE_INFO, 193 "Owner ID [0x%2.2X] already exists", *OwnerId)); 194 return_ACPI_STATUS (AE_ALREADY_EXISTS); 195 } 196 197 /* Mutex for the global ID mask */ 198 199 Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES); 200 if (ACPI_FAILURE (Status)) 201 { 202 return_ACPI_STATUS (Status); 203 } 204 205 /* 206 * Find a free owner ID, cycle through all possible IDs on repeated 207 * allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index 208 * may have to be scanned twice. 209 */ 210 for (i = 0, j = AcpiGbl_LastOwnerIdIndex; 211 i < (ACPI_NUM_OWNERID_MASKS + 1); 212 i++, j++) 213 { 214 if (j >= ACPI_NUM_OWNERID_MASKS) 215 { 216 j = 0; /* Wraparound to start of mask array */ 217 } 218 219 for (k = AcpiGbl_NextOwnerIdOffset; k < 32; k++) 220 { 221 if (AcpiGbl_OwnerIdMask[j] == ACPI_UINT32_MAX) 222 { 223 /* There are no free IDs in this mask */ 224 225 break; 226 } 227 228 /* 229 * Note: the UINT32 cast ensures that 1 is stored as a unsigned 230 * integer. Omitting the cast may result in 1 being stored as an 231 * int. Some compilers or runtime error detection may flag this as 232 * an error. 233 */ 234 if (!(AcpiGbl_OwnerIdMask[j] & ((UINT32) 1 << k))) 235 { 236 /* 237 * Found a free ID. The actual ID is the bit index plus one, 238 * making zero an invalid Owner ID. Save this as the last ID 239 * allocated and update the global ID mask. 240 */ 241 AcpiGbl_OwnerIdMask[j] |= ((UINT32) 1 << k); 242 243 AcpiGbl_LastOwnerIdIndex = (UINT8) j; 244 AcpiGbl_NextOwnerIdOffset = (UINT8) (k + 1); 245 246 /* 247 * Construct encoded ID from the index and bit position 248 * 249 * Note: Last [j].k (bit 255) is never used and is marked 250 * permanently allocated (prevents +1 overflow) 251 */ 252 *OwnerId = (ACPI_OWNER_ID) ((k + 1) + ACPI_MUL_32 (j)); 253 254 ACPI_DEBUG_PRINT ((ACPI_DB_VALUES, 255 "Allocated OwnerId: %2.2X\n", (unsigned int) *OwnerId)); 256 goto Exit; 257 } 258 } 259 260 AcpiGbl_NextOwnerIdOffset = 0; 261 } 262 263 /* 264 * All OwnerIds have been allocated. This typically should 265 * not happen since the IDs are reused after deallocation. The IDs are 266 * allocated upon table load (one per table) and method execution, and 267 * they are released when a table is unloaded or a method completes 268 * execution. 269 * 270 * If this error happens, there may be very deep nesting of invoked 271 * control methods, or there may be a bug where the IDs are not released. 272 */ 273 Status = AE_OWNER_ID_LIMIT; 274 ACPI_ERROR ((AE_INFO, 275 "Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT")); 276 277 Exit: 278 (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES); 279 return_ACPI_STATUS (Status); 280 } 281 282 283 /******************************************************************************* 284 * 285 * FUNCTION: AcpiUtReleaseOwnerId 286 * 287 * PARAMETERS: OwnerIdPtr - Pointer to a previously allocated OwnerID 288 * 289 * RETURN: None. No error is returned because we are either exiting a 290 * control method or unloading a table. Either way, we would 291 * ignore any error anyway. 292 * 293 * DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255 294 * 295 ******************************************************************************/ 296 297 void 298 AcpiUtReleaseOwnerId ( 299 ACPI_OWNER_ID *OwnerIdPtr) 300 { 301 ACPI_OWNER_ID OwnerId = *OwnerIdPtr; 302 ACPI_STATUS Status; 303 UINT32 Index; 304 UINT32 Bit; 305 306 307 ACPI_FUNCTION_TRACE_U32 (UtReleaseOwnerId, OwnerId); 308 309 310 /* Always clear the input OwnerId (zero is an invalid ID) */ 311 312 *OwnerIdPtr = 0; 313 314 /* Zero is not a valid OwnerID */ 315 316 if (OwnerId == 0) 317 { 318 ACPI_ERROR ((AE_INFO, "Invalid OwnerId: 0x%2.2X", OwnerId)); 319 return_VOID; 320 } 321 322 /* Mutex for the global ID mask */ 323 324 Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES); 325 if (ACPI_FAILURE (Status)) 326 { 327 return_VOID; 328 } 329 330 /* Normalize the ID to zero */ 331 332 OwnerId--; 333 334 /* Decode ID to index/offset pair */ 335 336 Index = ACPI_DIV_32 (OwnerId); 337 Bit = (UINT32) 1 << ACPI_MOD_32 (OwnerId); 338 339 /* Free the owner ID only if it is valid */ 340 341 if (AcpiGbl_OwnerIdMask[Index] & Bit) 342 { 343 AcpiGbl_OwnerIdMask[Index] ^= Bit; 344 } 345 else 346 { 347 ACPI_ERROR ((AE_INFO, 348 "Release of non-allocated OwnerId: 0x%2.2X", OwnerId + 1)); 349 } 350 351 (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES); 352 return_VOID; 353 } 354