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