drivers/acpi/acpica/tbutils.c

   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
 384 /*******************************************************************************
 385  *
 386  * FUNCTION:    acpi_is_valid_signature
 387  *
 388  * PARAMETERS:  signature           - Sig string to be validated
 389  *
 390  * RETURN:      TRUE if signature is has 4 valid ACPI characters
 391  *
 392  * DESCRIPTION: Validate an ACPI table signature.
 393  *
 394  ******************************************************************************/
 395
 396 u8 acpi_is_valid_signature(char *signature)
 397 {
 398         u32 i;
 399
 400         /* Validate each character in the signature */
 401
 402         for (i = 0; i < ACPI_NAME_SIZE; i++) {
 403                 if (!acpi_ut_valid_acpi_char(signature[i], i)) {
 404                         return (FALSE);
 405                 }
 406         }
 407
 408         return (TRUE);
 409 }