1 /****************************************************************************** 2 * 3 * Module Name: tbinstal - ACPI table installation and removal 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, 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 "acpi.h" 45 #include "accommon.h" 46 #include "actables.h" 47 48 #define _COMPONENT ACPI_TABLES 49 ACPI_MODULE_NAME ("tbinstal") 50 51 /* Local prototypes */ 52 53 static BOOLEAN 54 AcpiTbCompareTables ( 55 ACPI_TABLE_DESC *TableDesc, 56 UINT32 TableIndex); 57 58 59 /******************************************************************************* 60 * 61 * FUNCTION: AcpiTbCompareTables 62 * 63 * PARAMETERS: TableDesc - Table 1 descriptor to be compared 64 * TableIndex - Index of table 2 to be compared 65 * 66 * RETURN: TRUE if both tables are identical. 67 * 68 * DESCRIPTION: This function compares a table with another table that has 69 * already been installed in the root table list. 70 * 71 ******************************************************************************/ 72 73 static BOOLEAN 74 AcpiTbCompareTables ( 75 ACPI_TABLE_DESC *TableDesc, 76 UINT32 TableIndex) 77 { 78 ACPI_STATUS Status = AE_OK; 79 BOOLEAN IsIdentical; 80 ACPI_TABLE_HEADER *Table; 81 UINT32 TableLength; 82 UINT8 TableFlags; 83 84 85 Status = AcpiTbAcquireTable (&AcpiGbl_RootTableList.Tables[TableIndex], 86 &Table, &TableLength, &TableFlags); 87 if (ACPI_FAILURE (Status)) 88 { 89 return (FALSE); 90 } 91 92 /* 93 * Check for a table match on the entire table length, 94 * not just the header. 95 */ 96 IsIdentical = (BOOLEAN)((TableDesc->Length != TableLength || 97 memcmp (TableDesc->Pointer, Table, TableLength)) ? 98 FALSE : TRUE); 99 100 /* Release the acquired table */ 101 102 AcpiTbReleaseTable (Table, TableLength, TableFlags); 103 return (IsIdentical); 104 } 105 106 107 /******************************************************************************* 108 * 109 * FUNCTION: AcpiTbInstallTableWithOverride 110 * 111 * PARAMETERS: NewTableDesc - New table descriptor to install 112 * Override - Whether override should be performed 113 * TableIndex - Where the table index is returned 114 * 115 * RETURN: None 116 * 117 * DESCRIPTION: Install an ACPI table into the global data structure. The 118 * table override mechanism is called to allow the host 119 * OS to replace any table before it is installed in the root 120 * table array. 121 * 122 ******************************************************************************/ 123 124 void 125 AcpiTbInstallTableWithOverride ( 126 ACPI_TABLE_DESC *NewTableDesc, 127 BOOLEAN Override, 128 UINT32 *TableIndex) 129 { 130 UINT32 i; 131 ACPI_STATUS Status; 132 133 134 Status = AcpiTbGetNextTableDescriptor (&i, NULL); 135 if (ACPI_FAILURE (Status)) 136 { 137 return; 138 } 139 140 /* 141 * ACPI Table Override: 142 * 143 * Before we install the table, let the host OS override it with a new 144 * one if desired. Any table within the RSDT/XSDT can be replaced, 145 * including the DSDT which is pointed to by the FADT. 146 */ 147 if (Override) 148 { 149 AcpiTbOverrideTable (NewTableDesc); 150 } 151 152 AcpiTbInitTableDescriptor (&AcpiGbl_RootTableList.Tables[i], 153 NewTableDesc->Address, NewTableDesc->Flags, NewTableDesc->Pointer); 154 155 AcpiTbPrintTableHeader (NewTableDesc->Address, NewTableDesc->Pointer); 156 157 /* This synchronizes AcpiGbl_DsdtIndex */ 158 159 *TableIndex = i; 160 161 /* Set the global integer width (based upon revision of the DSDT) */ 162 163 if (i == AcpiGbl_DsdtIndex) 164 { 165 AcpiUtSetIntegerWidth (NewTableDesc->Pointer->Revision); 166 } 167 } 168 169 170 /******************************************************************************* 171 * 172 * FUNCTION: AcpiTbInstallFixedTable 173 * 174 * PARAMETERS: Address - Physical address of DSDT or FACS 175 * Signature - Table signature, NULL if no need to 176 * match 177 * TableIndex - Where the table index is returned 178 * 179 * RETURN: Status 180 * 181 * DESCRIPTION: Install a fixed ACPI table (DSDT/FACS) into the global data 182 * structure. 183 * 184 ******************************************************************************/ 185 186 ACPI_STATUS 187 AcpiTbInstallFixedTable ( 188 ACPI_PHYSICAL_ADDRESS Address, 189 char *Signature, 190 UINT32 *TableIndex) 191 { 192 ACPI_TABLE_DESC NewTableDesc; 193 ACPI_STATUS Status; 194 195 196 ACPI_FUNCTION_TRACE (TbInstallFixedTable); 197 198 199 if (!Address) 200 { 201 ACPI_ERROR ((AE_INFO, "Null physical address for ACPI table [%s]", 202 Signature)); 203 return (AE_NO_MEMORY); 204 } 205 206 /* Fill a table descriptor for validation */ 207 208 Status = AcpiTbAcquireTempTable (&NewTableDesc, Address, 209 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL); 210 if (ACPI_FAILURE (Status)) 211 { 212 ACPI_ERROR ((AE_INFO, "Could not acquire table length at %8.8X%8.8X", 213 ACPI_FORMAT_UINT64 (Address))); 214 return_ACPI_STATUS (Status); 215 } 216 217 /* Validate and verify a table before installation */ 218 219 Status = AcpiTbVerifyTempTable (&NewTableDesc, Signature); 220 if (ACPI_FAILURE (Status)) 221 { 222 goto ReleaseAndExit; 223 } 224 225 /* Add the table to the global root table list */ 226 227 AcpiTbInstallTableWithOverride (&NewTableDesc, TRUE, TableIndex); 228 229 ReleaseAndExit: 230 231 /* Release the temporary table descriptor */ 232 233 AcpiTbReleaseTempTable (&NewTableDesc); 234 return_ACPI_STATUS (Status); 235 } 236 237 238 /******************************************************************************* 239 * 240 * FUNCTION: AcpiTbInstallStandardTable 241 * 242 * PARAMETERS: Address - Address of the table (might be a virtual 243 * address depending on the TableFlags) 244 * Flags - Flags for the table 245 * Reload - Whether reload should be performed 246 * Override - Whether override should be performed 247 * TableIndex - Where the table index is returned 248 * 249 * RETURN: Status 250 * 251 * DESCRIPTION: This function is called to install an ACPI table that is 252 * neither DSDT nor FACS (a "standard" table.) 253 * When this function is called by "Load" or "LoadTable" opcodes, 254 * or by AcpiLoadTable() API, the "Reload" parameter is set. 255 * After sucessfully returning from this function, table is 256 * "INSTALLED" but not "VALIDATED". 257 * 258 ******************************************************************************/ 259 260 ACPI_STATUS 261 AcpiTbInstallStandardTable ( 262 ACPI_PHYSICAL_ADDRESS Address, 263 UINT8 Flags, 264 BOOLEAN Reload, 265 BOOLEAN Override, 266 UINT32 *TableIndex) 267 { 268 UINT32 i; 269 ACPI_STATUS Status = AE_OK; 270 ACPI_TABLE_DESC NewTableDesc; 271 272 273 ACPI_FUNCTION_TRACE (TbInstallStandardTable); 274 275 276 /* Acquire a temporary table descriptor for validation */ 277 278 Status = AcpiTbAcquireTempTable (&NewTableDesc, Address, Flags); 279 if (ACPI_FAILURE (Status)) 280 { 281 ACPI_ERROR ((AE_INFO, 282 "Could not acquire table length at %8.8X%8.8X", 283 ACPI_FORMAT_UINT64 (Address))); 284 return_ACPI_STATUS (Status); 285 } 286 287 /* 288 * Optionally do not load any SSDTs from the RSDT/XSDT. This can 289 * be useful for debugging ACPI problems on some machines. 290 */ 291 if (!Reload && 292 AcpiGbl_DisableSsdtTableInstall && 293 ACPI_COMPARE_NAME (&NewTableDesc.Signature, ACPI_SIG_SSDT)) 294 { 295 ACPI_INFO (( 296 "Ignoring installation of %4.4s at %8.8X%8.8X", 297 NewTableDesc.Signature.Ascii, ACPI_FORMAT_UINT64 (Address))); 298 goto ReleaseAndExit; 299 } 300 301 /* Validate and verify a table before installation */ 302 303 Status = AcpiTbVerifyTempTable (&NewTableDesc, NULL); 304 if (ACPI_FAILURE (Status)) 305 { 306 goto ReleaseAndExit; 307 } 308 309 if (Reload) 310 { 311 /* 312 * Validate the incoming table signature. 313 * 314 * 1) Originally, we checked the table signature for "SSDT" or "PSDT". 315 * 2) We added support for OEMx tables, signature "OEM". 316 * 3) Valid tables were encountered with a null signature, so we just 317 * gave up on validating the signature, (05/2008). 318 * 4) We encountered non-AML tables such as the MADT, which caused 319 * interpreter errors and kernel faults. So now, we once again allow 320 * only "SSDT", "OEMx", and now, also a null signature. (05/2011). 321 */ 322 if ((NewTableDesc.Signature.Ascii[0] != 0x00) && 323 (!ACPI_COMPARE_NAME (&NewTableDesc.Signature, ACPI_SIG_SSDT)) && 324 (strncmp (NewTableDesc.Signature.Ascii, "OEM", 3))) 325 { 326 ACPI_BIOS_ERROR ((AE_INFO, 327 "Table has invalid signature [%4.4s] (0x%8.8X), " 328 "must be SSDT or OEMx", 329 AcpiUtValidNameseg (NewTableDesc.Signature.Ascii) ? 330 NewTableDesc.Signature.Ascii : "????", 331 NewTableDesc.Signature.Integer)); 332 333 Status = AE_BAD_SIGNATURE; 334 goto ReleaseAndExit; 335 } 336 337 /* Check if table is already registered */ 338 339 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i) 340 { 341 /* 342 * Check for a table match on the entire table length, 343 * not just the header. 344 */ 345 if (!AcpiTbCompareTables (&NewTableDesc, i)) 346 { 347 continue; 348 } 349 350 /* 351 * Note: the current mechanism does not unregister a table if it is 352 * dynamically unloaded. The related namespace entries are deleted, 353 * but the table remains in the root table list. 354 * 355 * The assumption here is that the number of different tables that 356 * will be loaded is actually small, and there is minimal overhead 357 * in just keeping the table in case it is needed again. 358 * 359 * If this assumption changes in the future (perhaps on large 360 * machines with many table load/unload operations), tables will 361 * need to be unregistered when they are unloaded, and slots in the 362 * root table list should be reused when empty. 363 */ 364 if (AcpiGbl_RootTableList.Tables[i].Flags & 365 ACPI_TABLE_IS_LOADED) 366 { 367 /* Table is still loaded, this is an error */ 368 369 Status = AE_ALREADY_EXISTS; 370 goto ReleaseAndExit; 371 } 372 else 373 { 374 /* 375 * Table was unloaded, allow it to be reloaded. 376 * As we are going to return AE_OK to the caller, we should 377 * take the responsibility of freeing the input descriptor. 378 * Refill the input descriptor to ensure 379 * AcpiTbInstallTableWithOverride() can be called again to 380 * indicate the re-installation. 381 */ 382 AcpiTbUninstallTable (&NewTableDesc); 383 *TableIndex = i; 384 return_ACPI_STATUS (AE_OK); 385 } 386 } 387 } 388 389 /* Add the table to the global root table list */ 390 391 AcpiTbInstallTableWithOverride (&NewTableDesc, Override, TableIndex); 392 393 ReleaseAndExit: 394 395 /* Release the temporary table descriptor */ 396 397 AcpiTbReleaseTempTable (&NewTableDesc); 398 return_ACPI_STATUS (Status); 399 } 400 401 402 /******************************************************************************* 403 * 404 * FUNCTION: AcpiTbOverrideTable 405 * 406 * PARAMETERS: OldTableDesc - Validated table descriptor to be 407 * overridden 408 * 409 * RETURN: None 410 * 411 * DESCRIPTION: Attempt table override by calling the OSL override functions. 412 * Note: If the table is overridden, then the entire new table 413 * is acquired and returned by this function. 414 * Before/after invocation, the table descriptor is in a state 415 * that is "VALIDATED". 416 * 417 ******************************************************************************/ 418 419 void 420 AcpiTbOverrideTable ( 421 ACPI_TABLE_DESC *OldTableDesc) 422 { 423 ACPI_STATUS Status; 424 char *OverrideType; 425 ACPI_TABLE_DESC NewTableDesc; 426 ACPI_TABLE_HEADER *Table; 427 ACPI_PHYSICAL_ADDRESS Address; 428 UINT32 Length; 429 430 431 /* (1) Attempt logical override (returns a logical address) */ 432 433 Status = AcpiOsTableOverride (OldTableDesc->Pointer, &Table); 434 if (ACPI_SUCCESS (Status) && Table) 435 { 436 AcpiTbAcquireTempTable (&NewTableDesc, ACPI_PTR_TO_PHYSADDR (Table), 437 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL); 438 OverrideType = "Logical"; 439 goto FinishOverride; 440 } 441 442 /* (2) Attempt physical override (returns a physical address) */ 443 444 Status = AcpiOsPhysicalTableOverride (OldTableDesc->Pointer, 445 &Address, &Length); 446 if (ACPI_SUCCESS (Status) && Address && Length) 447 { 448 AcpiTbAcquireTempTable (&NewTableDesc, Address, 449 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL); 450 OverrideType = "Physical"; 451 goto FinishOverride; 452 } 453 454 return; /* There was no override */ 455 456 457 FinishOverride: 458 459 /* Validate and verify a table before overriding */ 460 461 Status = AcpiTbVerifyTempTable (&NewTableDesc, NULL); 462 if (ACPI_FAILURE (Status)) 463 { 464 return; 465 } 466 467 ACPI_INFO (("%4.4s 0x%8.8X%8.8X" 468 " %s table override, new table: 0x%8.8X%8.8X", 469 OldTableDesc->Signature.Ascii, 470 ACPI_FORMAT_UINT64 (OldTableDesc->Address), 471 OverrideType, ACPI_FORMAT_UINT64 (NewTableDesc.Address))); 472 473 /* We can now uninstall the original table */ 474 475 AcpiTbUninstallTable (OldTableDesc); 476 477 /* 478 * Replace the original table descriptor and keep its state as 479 * "VALIDATED". 480 */ 481 AcpiTbInitTableDescriptor (OldTableDesc, NewTableDesc.Address, 482 NewTableDesc.Flags, NewTableDesc.Pointer); 483 AcpiTbValidateTempTable (OldTableDesc); 484 485 /* Release the temporary table descriptor */ 486 487 AcpiTbReleaseTempTable (&NewTableDesc); 488 } 489 490 491 /******************************************************************************* 492 * 493 * FUNCTION: AcpiTbUninstallTable 494 * 495 * PARAMETERS: TableDesc - Table descriptor 496 * 497 * RETURN: None 498 * 499 * DESCRIPTION: Delete one internal ACPI table 500 * 501 ******************************************************************************/ 502 503 void 504 AcpiTbUninstallTable ( 505 ACPI_TABLE_DESC *TableDesc) 506 { 507 508 ACPI_FUNCTION_TRACE (TbUninstallTable); 509 510 511 /* Table must be installed */ 512 513 if (!TableDesc->Address) 514 { 515 return_VOID; 516 } 517 518 AcpiTbInvalidateTable (TableDesc); 519 520 if ((TableDesc->Flags & ACPI_TABLE_ORIGIN_MASK) == 521 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) 522 { 523 ACPI_FREE (ACPI_PHYSADDR_TO_PTR (TableDesc->Address)); 524 } 525 526 TableDesc->Address = ACPI_PTR_TO_PHYSADDR (NULL); 527 return_VOID; 528 } 529