1 /****************************************************************************** 2 * 3 * Module Name: tbutils - ACPI Table utilities 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 <acpi/acpi.h> 45 #include "accommon.h" 46 #include "actables.h" 47 48 #define _COMPONENT ACPI_TABLES 49 ACPI_MODULE_NAME("tbutils") 50 51 /* Local prototypes */ 52 static acpi_physical_address 53 acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size); 54 55 #if (!ACPI_REDUCED_HARDWARE) 56 /******************************************************************************* 57 * 58 * FUNCTION: acpi_tb_initialize_facs 59 * 60 * PARAMETERS: None 61 * 62 * RETURN: Status 63 * 64 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global 65 * for accessing the Global Lock and Firmware Waking Vector 66 * 67 ******************************************************************************/ 68 69 acpi_status acpi_tb_initialize_facs(void) 70 { 71 72 /* If Hardware Reduced flag is set, there is no FACS */ 73 74 if (acpi_gbl_reduced_hardware) { 75 acpi_gbl_FACS = NULL; 76 return (AE_OK); 77 } 78 79 (void)acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, 80 ACPI_CAST_INDIRECT_PTR(struct 81 acpi_table_header, 82 &acpi_gbl_facs32)); 83 (void)acpi_get_table_by_index(ACPI_TABLE_INDEX_X_FACS, 84 ACPI_CAST_INDIRECT_PTR(struct 85 acpi_table_header, 86 &acpi_gbl_facs64)); 87 88 if (acpi_gbl_facs64 89 && (!acpi_gbl_facs32 || !acpi_gbl_use32_bit_facs_addresses)) { 90 acpi_gbl_FACS = acpi_gbl_facs64; 91 } else if (acpi_gbl_facs32) { 92 acpi_gbl_FACS = acpi_gbl_facs32; 93 } 94 95 /* If there is no FACS, just continue. There was already an error msg */ 96 97 return (AE_OK); 98 } 99 #endif /* !ACPI_REDUCED_HARDWARE */ 100 101 /******************************************************************************* 102 * 103 * FUNCTION: acpi_tb_tables_loaded 104 * 105 * PARAMETERS: None 106 * 107 * RETURN: TRUE if required ACPI tables are loaded 108 * 109 * DESCRIPTION: Determine if the minimum required ACPI tables are present 110 * (FADT, FACS, DSDT) 111 * 112 ******************************************************************************/ 113 114 u8 acpi_tb_tables_loaded(void) 115 { 116 117 if (acpi_gbl_root_table_list.current_table_count >= 4) { 118 return (TRUE); 119 } 120 121 return (FALSE); 122 } 123 124 /******************************************************************************* 125 * 126 * FUNCTION: acpi_tb_check_dsdt_header 127 * 128 * PARAMETERS: None 129 * 130 * RETURN: None 131 * 132 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect 133 * if the DSDT has been replaced from outside the OS and/or if 134 * the DSDT header has been corrupted. 135 * 136 ******************************************************************************/ 137 138 void acpi_tb_check_dsdt_header(void) 139 { 140 141 /* Compare original length and checksum to current values */ 142 143 if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length || 144 acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) { 145 ACPI_BIOS_ERROR((AE_INFO, 146 "The DSDT has been corrupted or replaced - " 147 "old, new headers below")); 148 acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header); 149 acpi_tb_print_table_header(0, acpi_gbl_DSDT); 150 151 ACPI_ERROR((AE_INFO, 152 "Please send DMI info to linux-acpi@vger.kernel.org\n" 153 "If system does not work as expected, please boot with acpi=copy_dsdt")); 154 155 /* Disable further error messages */ 156 157 acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length; 158 acpi_gbl_original_dsdt_header.checksum = 159 acpi_gbl_DSDT->checksum; 160 } 161 } 162 163 /******************************************************************************* 164 * 165 * FUNCTION: acpi_tb_copy_dsdt 166 * 167 * PARAMETERS: table_desc - Installed table to copy 168 * 169 * RETURN: None 170 * 171 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. 172 * Some very bad BIOSs are known to either corrupt the DSDT or 173 * install a new, bad DSDT. This copy works around the problem. 174 * 175 ******************************************************************************/ 176 177 struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index) 178 { 179 struct acpi_table_header *new_table; 180 struct acpi_table_desc *table_desc; 181 182 table_desc = &acpi_gbl_root_table_list.tables[table_index]; 183 184 new_table = ACPI_ALLOCATE(table_desc->length); 185 if (!new_table) { 186 ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X", 187 table_desc->length)); 188 return (NULL); 189 } 190 191 memcpy(new_table, table_desc->pointer, table_desc->length); 192 acpi_tb_uninstall_table(table_desc); 193 194 acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list. 195 tables[ACPI_TABLE_INDEX_DSDT], 196 ACPI_PTR_TO_PHYSADDR(new_table), 197 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, 198 new_table); 199 200 ACPI_INFO((AE_INFO, 201 "Forced DSDT copy: length 0x%05X copied locally, original unmapped", 202 new_table->length)); 203 204 return (new_table); 205 } 206 207 /******************************************************************************* 208 * 209 * FUNCTION: acpi_tb_get_root_table_entry 210 * 211 * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry 212 * table_entry_size - sizeof 32 or 64 (RSDT or XSDT) 213 * 214 * RETURN: Physical address extracted from the root table 215 * 216 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on 217 * both 32-bit and 64-bit platforms 218 * 219 * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on 220 * 64-bit platforms. 221 * 222 ******************************************************************************/ 223 224 static acpi_physical_address 225 acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) 226 { 227 u64 address64; 228 229 /* 230 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): 231 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT 232 */ 233 if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) { 234 /* 235 * 32-bit platform, RSDT: Return 32-bit table entry 236 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return 237 */ 238 return ((acpi_physical_address) 239 (*ACPI_CAST_PTR(u32, table_entry))); 240 } else { 241 /* 242 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return 243 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, 244 * return 64-bit 245 */ 246 ACPI_MOVE_64_TO_64(&address64, table_entry); 247 248 #if ACPI_MACHINE_WIDTH == 32 249 if (address64 > ACPI_UINT32_MAX) { 250 251 /* Will truncate 64-bit address to 32 bits, issue warning */ 252 253 ACPI_BIOS_WARNING((AE_INFO, 254 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," 255 " truncating", 256 ACPI_FORMAT_UINT64(address64))); 257 } 258 #endif 259 return ((acpi_physical_address) (address64)); 260 } 261 } 262 263 /******************************************************************************* 264 * 265 * FUNCTION: acpi_tb_parse_root_table 266 * 267 * PARAMETERS: rsdp - Pointer to the RSDP 268 * 269 * RETURN: Status 270 * 271 * DESCRIPTION: This function is called to parse the Root System Description 272 * Table (RSDT or XSDT) 273 * 274 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must 275 * be mapped and cannot be copied because it contains the actual 276 * memory location of the ACPI Global Lock. 277 * 278 ******************************************************************************/ 279 280 acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address) 281 { 282 struct acpi_table_rsdp *rsdp; 283 u32 table_entry_size; 284 u32 i; 285 u32 table_count; 286 struct acpi_table_header *table; 287 acpi_physical_address address; 288 u32 length; 289 u8 *table_entry; 290 acpi_status status; 291 u32 table_index; 292 293 ACPI_FUNCTION_TRACE(tb_parse_root_table); 294 295 /* Map the entire RSDP and extract the address of the RSDT or XSDT */ 296 297 rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp)); 298 if (!rsdp) { 299 return_ACPI_STATUS(AE_NO_MEMORY); 300 } 301 302 acpi_tb_print_table_header(rsdp_address, 303 ACPI_CAST_PTR(struct acpi_table_header, 304 rsdp)); 305 306 /* Use XSDT if present and not overridden. Otherwise, use RSDT */ 307 308 if ((rsdp->revision > 1) && 309 rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) { 310 /* 311 * RSDP contains an XSDT (64-bit physical addresses). We must use 312 * the XSDT if the revision is > 1 and the XSDT pointer is present, 313 * as per the ACPI specification. 314 */ 315 address = (acpi_physical_address) rsdp->xsdt_physical_address; 316 table_entry_size = ACPI_XSDT_ENTRY_SIZE; 317 } else { 318 /* Root table is an RSDT (32-bit physical addresses) */ 319 320 address = (acpi_physical_address) rsdp->rsdt_physical_address; 321 table_entry_size = ACPI_RSDT_ENTRY_SIZE; 322 } 323 324 /* 325 * It is not possible to map more than one entry in some environments, 326 * so unmap the RSDP here before mapping other tables 327 */ 328 acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp)); 329 330 /* Map the RSDT/XSDT table header to get the full table length */ 331 332 table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); 333 if (!table) { 334 return_ACPI_STATUS(AE_NO_MEMORY); 335 } 336 337 acpi_tb_print_table_header(address, table); 338 339 /* 340 * Validate length of the table, and map entire table. 341 * Minimum length table must contain at least one entry. 342 */ 343 length = table->length; 344 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); 345 346 if (length < (sizeof(struct acpi_table_header) + table_entry_size)) { 347 ACPI_BIOS_ERROR((AE_INFO, 348 "Invalid table length 0x%X in RSDT/XSDT", 349 length)); 350 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); 351 } 352 353 table = acpi_os_map_memory(address, length); 354 if (!table) { 355 return_ACPI_STATUS(AE_NO_MEMORY); 356 } 357 358 /* Validate the root table checksum */ 359 360 status = acpi_tb_verify_checksum(table, length); 361 if (ACPI_FAILURE(status)) { 362 acpi_os_unmap_memory(table, length); 363 return_ACPI_STATUS(status); 364 } 365 366 /* Get the number of entries and pointer to first entry */ 367 368 table_count = (u32)((table->length - sizeof(struct acpi_table_header)) / 369 table_entry_size); 370 table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header)); 371 372 /* 373 * First three entries in the table array are reserved for the DSDT 374 * and 32bit/64bit FACS, which are not actually present in the 375 * RSDT/XSDT - they come from the FADT 376 */ 377 acpi_gbl_root_table_list.current_table_count = 3; 378 379 /* Initialize the root table array from the RSDT/XSDT */ 380 381 for (i = 0; i < table_count; i++) { 382 383 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ 384 385 address = 386 acpi_tb_get_root_table_entry(table_entry, table_entry_size); 387 388 /* Skip NULL entries in RSDT/XSDT */ 389 390 if (!address) { 391 goto next_table; 392 } 393 394 status = acpi_tb_install_standard_table(address, 395 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, 396 FALSE, TRUE, 397 &table_index); 398 399 if (ACPI_SUCCESS(status) && 400 ACPI_COMPARE_NAME(&acpi_gbl_root_table_list. 401 tables[table_index].signature, 402 ACPI_SIG_FADT)) { 403 acpi_tb_parse_fadt(table_index); 404 } 405 406 next_table: 407 408 table_entry += table_entry_size; 409 } 410 411 acpi_os_unmap_memory(table, length); 412 413 return_ACPI_STATUS(AE_OK); 414 } 415