1 /****************************************************************************** 2 * 3 * Module Name: tbutils - ACPI Table utilities 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 ("tbutils") 50 51 52 /* Local prototypes */ 53 54 static ACPI_PHYSICAL_ADDRESS 55 AcpiTbGetRootTableEntry ( 56 UINT8 *TableEntry, 57 UINT32 TableEntrySize); 58 59 60 #if (!ACPI_REDUCED_HARDWARE) 61 /******************************************************************************* 62 * 63 * FUNCTION: AcpiTbInitializeFacs 64 * 65 * PARAMETERS: None 66 * 67 * RETURN: Status 68 * 69 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global 70 * for accessing the Global Lock and Firmware Waking Vector 71 * 72 ******************************************************************************/ 73 74 ACPI_STATUS 75 AcpiTbInitializeFacs ( 76 void) 77 { 78 ACPI_TABLE_FACS *Facs; 79 80 81 /* If Hardware Reduced flag is set, there is no FACS */ 82 83 if (AcpiGbl_ReducedHardware) 84 { 85 AcpiGbl_FACS = NULL; 86 return (AE_OK); 87 } 88 else if (AcpiGbl_FADT.XFacs && 89 (!AcpiGbl_FADT.Facs || !AcpiGbl_Use32BitFacsAddresses)) 90 { 91 (void) AcpiGetTableByIndex (AcpiGbl_XFacsIndex, 92 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &Facs)); 93 AcpiGbl_FACS = Facs; 94 } 95 else if (AcpiGbl_FADT.Facs) 96 { 97 (void) AcpiGetTableByIndex (AcpiGbl_FacsIndex, 98 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &Facs)); 99 AcpiGbl_FACS = Facs; 100 } 101 102 /* If there is no FACS, just continue. There was already an error msg */ 103 104 return (AE_OK); 105 } 106 #endif /* !ACPI_REDUCED_HARDWARE */ 107 108 109 /******************************************************************************* 110 * 111 * FUNCTION: AcpiTbCheckDsdtHeader 112 * 113 * PARAMETERS: None 114 * 115 * RETURN: None 116 * 117 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect 118 * if the DSDT has been replaced from outside the OS and/or if 119 * the DSDT header has been corrupted. 120 * 121 ******************************************************************************/ 122 123 void 124 AcpiTbCheckDsdtHeader ( 125 void) 126 { 127 128 /* Compare original length and checksum to current values */ 129 130 if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length || 131 AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum) 132 { 133 ACPI_BIOS_ERROR ((AE_INFO, 134 "The DSDT has been corrupted or replaced - " 135 "old, new headers below")); 136 137 AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader); 138 AcpiTbPrintTableHeader (0, AcpiGbl_DSDT); 139 140 /* Disable further error messages */ 141 142 AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length; 143 AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum; 144 } 145 } 146 147 148 /******************************************************************************* 149 * 150 * FUNCTION: AcpiTbCopyDsdt 151 * 152 * PARAMETERS: TableDesc - Installed table to copy 153 * 154 * RETURN: None 155 * 156 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. 157 * Some very bad BIOSs are known to either corrupt the DSDT or 158 * install a new, bad DSDT. This copy works around the problem. 159 * 160 ******************************************************************************/ 161 162 ACPI_TABLE_HEADER * 163 AcpiTbCopyDsdt ( 164 UINT32 TableIndex) 165 { 166 ACPI_TABLE_HEADER *NewTable; 167 ACPI_TABLE_DESC *TableDesc; 168 169 170 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex]; 171 172 NewTable = ACPI_ALLOCATE (TableDesc->Length); 173 if (!NewTable) 174 { 175 ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X", 176 TableDesc->Length)); 177 return (NULL); 178 } 179 180 memcpy (NewTable, TableDesc->Pointer, TableDesc->Length); 181 AcpiTbUninstallTable (TableDesc); 182 183 AcpiTbInitTableDescriptor ( 184 &AcpiGbl_RootTableList.Tables[AcpiGbl_DsdtIndex], 185 ACPI_PTR_TO_PHYSADDR (NewTable), 186 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, NewTable); 187 188 ACPI_INFO (( 189 "Forced DSDT copy: length 0x%05X copied locally, original unmapped", 190 NewTable->Length)); 191 192 return (NewTable); 193 } 194 195 196 /******************************************************************************* 197 * 198 * FUNCTION: AcpiTbGetRootTableEntry 199 * 200 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry 201 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT) 202 * 203 * RETURN: Physical address extracted from the root table 204 * 205 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on 206 * both 32-bit and 64-bit platforms 207 * 208 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on 209 * 64-bit platforms. 210 * 211 ******************************************************************************/ 212 213 static ACPI_PHYSICAL_ADDRESS 214 AcpiTbGetRootTableEntry ( 215 UINT8 *TableEntry, 216 UINT32 TableEntrySize) 217 { 218 UINT64 Address64; 219 220 221 /* 222 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): 223 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT 224 */ 225 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE) 226 { 227 /* 228 * 32-bit platform, RSDT: Return 32-bit table entry 229 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return 230 */ 231 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR ( 232 UINT32, TableEntry))); 233 } 234 else 235 { 236 /* 237 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return 238 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, 239 * return 64-bit 240 */ 241 ACPI_MOVE_64_TO_64 (&Address64, TableEntry); 242 243 #if ACPI_MACHINE_WIDTH == 32 244 if (Address64 > ACPI_UINT32_MAX) 245 { 246 /* Will truncate 64-bit address to 32 bits, issue warning */ 247 248 ACPI_BIOS_WARNING ((AE_INFO, 249 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," 250 " truncating", 251 ACPI_FORMAT_UINT64 (Address64))); 252 } 253 #endif 254 return ((ACPI_PHYSICAL_ADDRESS) (Address64)); 255 } 256 } 257 258 259 /******************************************************************************* 260 * 261 * FUNCTION: AcpiTbParseRootTable 262 * 263 * PARAMETERS: Rsdp - Pointer to the RSDP 264 * 265 * RETURN: Status 266 * 267 * DESCRIPTION: This function is called to parse the Root System Description 268 * Table (RSDT or XSDT) 269 * 270 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must 271 * be mapped and cannot be copied because it contains the actual 272 * memory location of the ACPI Global Lock. 273 * 274 ******************************************************************************/ 275 276 ACPI_STATUS 277 AcpiTbParseRootTable ( 278 ACPI_PHYSICAL_ADDRESS RsdpAddress) 279 { 280 ACPI_TABLE_RSDP *Rsdp; 281 UINT32 TableEntrySize; 282 UINT32 i; 283 UINT32 TableCount; 284 ACPI_TABLE_HEADER *Table; 285 ACPI_PHYSICAL_ADDRESS Address; 286 UINT32 Length; 287 UINT8 *TableEntry; 288 ACPI_STATUS Status; 289 UINT32 TableIndex; 290 291 292 ACPI_FUNCTION_TRACE (TbParseRootTable); 293 294 295 /* Map the entire RSDP and extract the address of the RSDT or XSDT */ 296 297 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP)); 298 if (!Rsdp) 299 { 300 return_ACPI_STATUS (AE_NO_MEMORY); 301 } 302 303 AcpiTbPrintTableHeader (RsdpAddress, 304 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp)); 305 306 /* Use XSDT if present and not overridden. Otherwise, use RSDT */ 307 308 if ((Rsdp->Revision > 1) && 309 Rsdp->XsdtPhysicalAddress && 310 !AcpiGbl_DoNotUseXsdt) 311 { 312 /* 313 * RSDP contains an XSDT (64-bit physical addresses). We must use 314 * the XSDT if the revision is > 1 and the XSDT pointer is present, 315 * as per the ACPI specification. 316 */ 317 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress; 318 TableEntrySize = ACPI_XSDT_ENTRY_SIZE; 319 } 320 else 321 { 322 /* Root table is an RSDT (32-bit physical addresses) */ 323 324 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress; 325 TableEntrySize = ACPI_RSDT_ENTRY_SIZE; 326 } 327 328 /* 329 * It is not possible to map more than one entry in some environments, 330 * so unmap the RSDP here before mapping other tables 331 */ 332 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP)); 333 334 /* Map the RSDT/XSDT table header to get the full table length */ 335 336 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER)); 337 if (!Table) 338 { 339 return_ACPI_STATUS (AE_NO_MEMORY); 340 } 341 342 AcpiTbPrintTableHeader (Address, Table); 343 344 /* 345 * Validate length of the table, and map entire table. 346 * Minimum length table must contain at least one entry. 347 */ 348 Length = Table->Length; 349 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER)); 350 351 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize)) 352 { 353 ACPI_BIOS_ERROR ((AE_INFO, 354 "Invalid table length 0x%X in RSDT/XSDT", Length)); 355 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 356 } 357 358 Table = AcpiOsMapMemory (Address, Length); 359 if (!Table) 360 { 361 return_ACPI_STATUS (AE_NO_MEMORY); 362 } 363 364 /* Validate the root table checksum */ 365 366 Status = AcpiTbVerifyChecksum (Table, Length); 367 if (ACPI_FAILURE (Status)) 368 { 369 AcpiOsUnmapMemory (Table, Length); 370 return_ACPI_STATUS (Status); 371 } 372 373 /* Get the number of entries and pointer to first entry */ 374 375 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) / 376 TableEntrySize); 377 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER)); 378 379 /* Initialize the root table array from the RSDT/XSDT */ 380 381 for (i = 0; i < TableCount; i++) 382 { 383 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ 384 385 Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize); 386 387 /* Skip NULL entries in RSDT/XSDT */ 388 389 if (!Address) 390 { 391 goto NextTable; 392 } 393 394 Status = AcpiTbInstallStandardTable (Address, 395 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE, &TableIndex); 396 397 if (ACPI_SUCCESS (Status) && 398 ACPI_COMPARE_NAME ( 399 &AcpiGbl_RootTableList.Tables[TableIndex].Signature, 400 ACPI_SIG_FADT)) 401 { 402 AcpiGbl_FadtIndex = TableIndex; 403 AcpiTbParseFadt (); 404 } 405 406 NextTable: 407 408 TableEntry += TableEntrySize; 409 } 410 411 AcpiOsUnmapMemory (Table, Length); 412 return_ACPI_STATUS (AE_OK); 413 } 414