1 /****************************************************************************** 2 * 3 * Module Name: tbutils - ACPI Table utilities 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2014, 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 acpi_status status; 72 73 /* If Hardware Reduced flag is set, there is no FACS */ 74 75 if (acpi_gbl_reduced_hardware) { 76 acpi_gbl_FACS = NULL; 77 return (AE_OK); 78 } 79 80 status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, 81 ACPI_CAST_INDIRECT_PTR(struct 82 acpi_table_header, 83 &acpi_gbl_FACS)); 84 return (status); 85 } 86 #endif /* !ACPI_REDUCED_HARDWARE */ 87 88 /******************************************************************************* 89 * 90 * FUNCTION: acpi_tb_tables_loaded 91 * 92 * PARAMETERS: None 93 * 94 * RETURN: TRUE if required ACPI tables are loaded 95 * 96 * DESCRIPTION: Determine if the minimum required ACPI tables are present 97 * (FADT, FACS, DSDT) 98 * 99 ******************************************************************************/ 100 101 u8 acpi_tb_tables_loaded(void) 102 { 103 104 if (acpi_gbl_root_table_list.current_table_count >= 3) { 105 return (TRUE); 106 } 107 108 return (FALSE); 109 } 110 111 /******************************************************************************* 112 * 113 * FUNCTION: acpi_tb_check_dsdt_header 114 * 115 * PARAMETERS: None 116 * 117 * RETURN: None 118 * 119 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect 120 * if the DSDT has been replaced from outside the OS and/or if 121 * the DSDT header has been corrupted. 122 * 123 ******************************************************************************/ 124 125 void acpi_tb_check_dsdt_header(void) 126 { 127 128 /* Compare original length and checksum to current values */ 129 130 if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length || 131 acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) { 132 ACPI_BIOS_ERROR((AE_INFO, 133 "The DSDT has been corrupted or replaced - " 134 "old, new headers below")); 135 acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header); 136 acpi_tb_print_table_header(0, acpi_gbl_DSDT); 137 138 ACPI_ERROR((AE_INFO, 139 "Please send DMI info to linux-acpi@vger.kernel.org\n" 140 "If system does not work as expected, please boot with acpi=copy_dsdt")); 141 142 /* Disable further error messages */ 143 144 acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length; 145 acpi_gbl_original_dsdt_header.checksum = 146 acpi_gbl_DSDT->checksum; 147 } 148 } 149 150 /******************************************************************************* 151 * 152 * FUNCTION: acpi_tb_copy_dsdt 153 * 154 * PARAMETERS: table_desc - Installed table to copy 155 * 156 * RETURN: None 157 * 158 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. 159 * Some very bad BIOSs are known to either corrupt the DSDT or 160 * install a new, bad DSDT. This copy works around the problem. 161 * 162 ******************************************************************************/ 163 164 struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index) 165 { 166 struct acpi_table_header *new_table; 167 struct acpi_table_desc *table_desc; 168 169 table_desc = &acpi_gbl_root_table_list.tables[table_index]; 170 171 new_table = ACPI_ALLOCATE(table_desc->length); 172 if (!new_table) { 173 ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X", 174 table_desc->length)); 175 return (NULL); 176 } 177 178 ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length); 179 acpi_tb_uninstall_table(table_desc); 180 181 acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list. 182 tables[ACPI_TABLE_INDEX_DSDT], 183 ACPI_PTR_TO_PHYSADDR(new_table), 184 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, 185 new_table); 186 187 ACPI_INFO((AE_INFO, 188 "Forced DSDT copy: length 0x%05X copied locally, original unmapped", 189 new_table->length)); 190 191 return (new_table); 192 } 193 194 /******************************************************************************* 195 * 196 * FUNCTION: acpi_tb_get_root_table_entry 197 * 198 * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry 199 * table_entry_size - sizeof 32 or 64 (RSDT or XSDT) 200 * 201 * RETURN: Physical address extracted from the root table 202 * 203 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on 204 * both 32-bit and 64-bit platforms 205 * 206 * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on 207 * 64-bit platforms. 208 * 209 ******************************************************************************/ 210 211 static acpi_physical_address 212 acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) 213 { 214 u64 address64; 215 216 /* 217 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): 218 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT 219 */ 220 if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) { 221 /* 222 * 32-bit platform, RSDT: Return 32-bit table entry 223 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return 224 */ 225 return ((acpi_physical_address) 226 (*ACPI_CAST_PTR(u32, table_entry))); 227 } else { 228 /* 229 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return 230 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, 231 * return 64-bit 232 */ 233 ACPI_MOVE_64_TO_64(&address64, table_entry); 234 235 #if ACPI_MACHINE_WIDTH == 32 236 if (address64 > ACPI_UINT32_MAX) { 237 238 /* Will truncate 64-bit address to 32 bits, issue warning */ 239 240 ACPI_BIOS_WARNING((AE_INFO, 241 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," 242 " truncating", 243 ACPI_FORMAT_UINT64(address64))); 244 } 245 #endif 246 return ((acpi_physical_address) (address64)); 247 } 248 } 249 250 /******************************************************************************* 251 * 252 * FUNCTION: acpi_tb_parse_root_table 253 * 254 * PARAMETERS: rsdp - Pointer to the RSDP 255 * 256 * RETURN: Status 257 * 258 * DESCRIPTION: This function is called to parse the Root System Description 259 * Table (RSDT or XSDT) 260 * 261 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must 262 * be mapped and cannot be copied because it contains the actual 263 * memory location of the ACPI Global Lock. 264 * 265 ******************************************************************************/ 266 267 acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address) 268 { 269 struct acpi_table_rsdp *rsdp; 270 u32 table_entry_size; 271 u32 i; 272 u32 table_count; 273 struct acpi_table_header *table; 274 acpi_physical_address address; 275 u32 length; 276 u8 *table_entry; 277 acpi_status status; 278 u32 table_index; 279 280 ACPI_FUNCTION_TRACE(tb_parse_root_table); 281 282 /* Map the entire RSDP and extract the address of the RSDT or XSDT */ 283 284 rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp)); 285 if (!rsdp) { 286 return_ACPI_STATUS(AE_NO_MEMORY); 287 } 288 289 acpi_tb_print_table_header(rsdp_address, 290 ACPI_CAST_PTR(struct acpi_table_header, 291 rsdp)); 292 293 /* Use XSDT if present and not overridden. Otherwise, use RSDT */ 294 295 if ((rsdp->revision > 1) && 296 rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) { 297 /* 298 * RSDP contains an XSDT (64-bit physical addresses). We must use 299 * the XSDT if the revision is > 1 and the XSDT pointer is present, 300 * as per the ACPI specification. 301 */ 302 address = (acpi_physical_address) rsdp->xsdt_physical_address; 303 table_entry_size = ACPI_XSDT_ENTRY_SIZE; 304 } else { 305 /* Root table is an RSDT (32-bit physical addresses) */ 306 307 address = (acpi_physical_address) rsdp->rsdt_physical_address; 308 table_entry_size = ACPI_RSDT_ENTRY_SIZE; 309 } 310 311 /* 312 * It is not possible to map more than one entry in some environments, 313 * so unmap the RSDP here before mapping other tables 314 */ 315 acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp)); 316 317 /* Map the RSDT/XSDT table header to get the full table length */ 318 319 table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); 320 if (!table) { 321 return_ACPI_STATUS(AE_NO_MEMORY); 322 } 323 324 acpi_tb_print_table_header(address, table); 325 326 /* 327 * Validate length of the table, and map entire table. 328 * Minimum length table must contain at least one entry. 329 */ 330 length = table->length; 331 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); 332 333 if (length < (sizeof(struct acpi_table_header) + table_entry_size)) { 334 ACPI_BIOS_ERROR((AE_INFO, 335 "Invalid table length 0x%X in RSDT/XSDT", 336 length)); 337 return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); 338 } 339 340 table = acpi_os_map_memory(address, length); 341 if (!table) { 342 return_ACPI_STATUS(AE_NO_MEMORY); 343 } 344 345 /* Validate the root table checksum */ 346 347 status = acpi_tb_verify_checksum(table, length); 348 if (ACPI_FAILURE(status)) { 349 acpi_os_unmap_memory(table, length); 350 return_ACPI_STATUS(status); 351 } 352 353 /* Get the number of entries and pointer to first entry */ 354 355 table_count = (u32)((table->length - sizeof(struct acpi_table_header)) / 356 table_entry_size); 357 table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header)); 358 359 /* 360 * First two entries in the table array are reserved for the DSDT 361 * and FACS, which are not actually present in the RSDT/XSDT - they 362 * come from the FADT 363 */ 364 acpi_gbl_root_table_list.current_table_count = 2; 365 366 /* Initialize the root table array from the RSDT/XSDT */ 367 368 for (i = 0; i < table_count; i++) { 369 370 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ 371 372 address = 373 acpi_tb_get_root_table_entry(table_entry, table_entry_size); 374 375 /* Skip NULL entries in RSDT/XSDT */ 376 377 if (!address) { 378 goto next_table; 379 } 380 381 status = acpi_tb_install_standard_table(address, 382 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, 383 FALSE, TRUE, 384 &table_index); 385 386 if (ACPI_SUCCESS(status) && 387 ACPI_COMPARE_NAME(&acpi_gbl_root_table_list. 388 tables[table_index].signature, 389 ACPI_SIG_FADT)) { 390 acpi_tb_parse_fadt(table_index); 391 } 392 393 next_table: 394 395 table_entry += table_entry_size; 396 } 397 398 acpi_os_unmap_memory(table, length); 399 400 return_ACPI_STATUS(AE_OK); 401 } 402