git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/tables/tbxfroot.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxfroot - Find the root ACPI table (RSDT)
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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 <linux/module.h>
  45
  46 #include <acpi/acpi.h>
  47 #include <acpi/actables.h>
  48
  49
  50 #define _COMPONENT          ACPI_TABLES
  51          ACPI_MODULE_NAME    ("tbxfroot")
  52
  53 /* Local prototypes */
  54
  55 static acpi_status
  56 acpi_tb_find_rsdp (
  57         struct acpi_table_desc          *table_info,
  58         u32                             flags);
  59
  60 static u8 *
  61 acpi_tb_scan_memory_for_rsdp (
  62         u8                              *start_address,
  63         u32                             length);
  64
  65
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    acpi_tb_validate_rsdp
  69  *
  70  * PARAMETERS:  Rsdp        - Pointer to unvalidated RSDP
  71  *
  72  * RETURN:      Status
  73  *
  74  * DESCRIPTION: Validate the RSDP (ptr)
  75  *
  76  ******************************************************************************/
  77
  78 acpi_status
  79 acpi_tb_validate_rsdp (
  80         struct rsdp_descriptor          *rsdp)
  81 {
  82         ACPI_FUNCTION_ENTRY ();
  83
  84
  85         /*
  86          *  The signature and checksum must both be correct
  87          */
  88         if (ACPI_STRNCMP ((char *) rsdp, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
  89                 /* Nope, BAD Signature */
  90
  91                 return (AE_BAD_SIGNATURE);
  92         }
  93
  94         /* Check the standard checksum */
  95
  96         if (acpi_tb_generate_checksum (rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
  97                 return (AE_BAD_CHECKSUM);
  98         }
  99
 100         /* Check extended checksum if table version >= 2 */
 101
 102         if ((rsdp->revision >= 2) &&
 103                 (acpi_tb_generate_checksum (rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) {
 104                 return (AE_BAD_CHECKSUM);
 105         }
 106
 107         return (AE_OK);
 108 }
 109
 110
 111 /*******************************************************************************
 112  *
 113  * FUNCTION:    acpi_tb_find_table
 114  *
 115  * PARAMETERS:  Signature           - String with ACPI table signature
 116  *              oem_id              - String with the table OEM ID
 117  *              oem_table_id        - String with the OEM Table ID
 118  *              table_ptr           - Where the table pointer is returned
 119  *
 120  * RETURN:      Status
 121  *
 122  * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
 123  *              Signature, OEM ID and OEM Table ID.
 124  *
 125  ******************************************************************************/
 126
 127 acpi_status
 128 acpi_tb_find_table (
 129         char                            *signature,
 130         char                            *oem_id,
 131         char                            *oem_table_id,
 132         struct acpi_table_header        **table_ptr)
 133 {
 134         acpi_status                     status;
 135         struct acpi_table_header        *table;
 136
 137
 138         ACPI_FUNCTION_TRACE ("tb_find_table");
 139
 140
 141         /* Validate string lengths */
 142
 143         if ((ACPI_STRLEN (signature)  > ACPI_NAME_SIZE) ||
 144                 (ACPI_STRLEN (oem_id)     > sizeof (table->oem_id)) ||
 145                 (ACPI_STRLEN (oem_table_id) > sizeof (table->oem_table_id))) {
 146                 return_ACPI_STATUS (AE_AML_STRING_LIMIT);
 147         }
 148
 149         if (!ACPI_STRNCMP (signature, DSDT_SIG, ACPI_NAME_SIZE)) {
 150                 /*
 151                  * The DSDT pointer is contained in the FADT, not the RSDT.
 152                  * This code should suffice, because the only code that would perform
 153                  * a "find" on the DSDT is the data_table_region() AML opcode -- in
 154                  * which case, the DSDT is guaranteed to be already loaded.
 155                  * If this becomes insufficient, the FADT will have to be found first.
 156                  */
 157                 if (!acpi_gbl_DSDT) {
 158                         return_ACPI_STATUS (AE_NO_ACPI_TABLES);
 159                 }
 160                 table = acpi_gbl_DSDT;
 161         }
 162         else {
 163                 /* Find the table */
 164
 165                 status = acpi_get_firmware_table (signature, 1,
 166                                  ACPI_LOGICAL_ADDRESSING, &table);
 167                 if (ACPI_FAILURE (status)) {
 168                         return_ACPI_STATUS (status);
 169                 }
 170         }
 171
 172         /* Check oem_id and oem_table_id */
 173
 174         if ((oem_id[0] && ACPI_STRNCMP (
 175                            oem_id, table->oem_id,
 176                            sizeof (table->oem_id))) ||
 177
 178                 (oem_table_id[0] && ACPI_STRNCMP (
 179                                    oem_table_id, table->oem_table_id,
 180                                    sizeof (table->oem_table_id)))) {
 181                 return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND);
 182         }
 183
 184         ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n",
 185                 table->signature));
 186
 187         *table_ptr = table;
 188         return_ACPI_STATUS (AE_OK);
 189 }
 190
 191
 192 /*******************************************************************************
 193  *
 194  * FUNCTION:    acpi_get_firmware_table
 195  *
 196  * PARAMETERS:  Signature       - Any ACPI table signature
 197  *              Instance        - the non zero instance of the table, allows
 198  *                                support for multiple tables of the same type
 199  *              Flags           - Physical/Virtual support
 200  *              table_pointer   - Where a buffer containing the table is
 201  *                                returned
 202  *
 203  * RETURN:      Status
 204  *
 205  * DESCRIPTION: This function is called to get an ACPI table. A buffer is
 206  *              allocated for the table and returned in table_pointer.
 207  *              This table will be a complete table including the header.
 208  *
 209  ******************************************************************************/
 210
 211 acpi_status
 212 acpi_get_firmware_table (
 213         acpi_string                     signature,
 214         u32                             instance,
 215         u32                             flags,
 216         struct acpi_table_header        **table_pointer)
 217 {
 218         acpi_status                     status;
 219         struct acpi_pointer             address;
 220         struct acpi_table_header        *header = NULL;
 221         struct acpi_table_desc          *table_info = NULL;
 222         struct acpi_table_desc          *rsdt_info;
 223         u32                             table_count;
 224         u32                             i;
 225         u32                             j;
 226
 227
 228         ACPI_FUNCTION_TRACE ("acpi_get_firmware_table");
 229
 230
 231         /*
 232          * Ensure that at least the table manager is initialized.  We don't
 233          * require that the entire ACPI subsystem is up for this interface.
 234          * If we have a buffer, we must have a length too
 235          */
 236         if ((instance == 0)     ||
 237                 (!signature)        ||
 238                 (!table_pointer)) {
 239                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 240         }
 241
 242         /* Ensure that we have a RSDP */
 243
 244         if (!acpi_gbl_RSDP) {
 245                 /* Get the RSDP */
 246
 247                 status = acpi_os_get_root_pointer (flags, &address);
 248                 if (ACPI_FAILURE (status)) {
 249                         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP not found\n"));
 250                         return_ACPI_STATUS (AE_NO_ACPI_TABLES);
 251                 }
 252
 253                 /* Map and validate the RSDP */
 254
 255                 if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
 256                         status = acpi_os_map_memory (address.pointer.physical,
 257                                          sizeof (struct rsdp_descriptor), (void *) &acpi_gbl_RSDP);
 258                         if (ACPI_FAILURE (status)) {
 259                                 return_ACPI_STATUS (status);
 260                         }
 261                 }
 262                 else {
 263                         acpi_gbl_RSDP = address.pointer.logical;
 264                 }
 265
 266                 /* The RDSP signature and checksum must both be correct */
 267
 268                 status = acpi_tb_validate_rsdp (acpi_gbl_RSDP);
 269                 if (ACPI_FAILURE (status)) {
 270                         return_ACPI_STATUS (status);
 271                 }
 272         }
 273
 274         /* Get the RSDT address via the RSDP */
 275
 276         acpi_tb_get_rsdt_address (&address);
 277         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 278                 "RSDP located at %p, RSDT physical=%8.8X%8.8X \n",
 279                 acpi_gbl_RSDP,
 280                 ACPI_FORMAT_UINT64 (address.pointer.value)));
 281
 282         /* Insert processor_mode flags */
 283
 284         address.pointer_type |= flags;
 285
 286         /* Get and validate the RSDT */
 287
 288         rsdt_info = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc));
 289         if (!rsdt_info) {
 290                 return_ACPI_STATUS (AE_NO_MEMORY);
 291         }
 292
 293         status = acpi_tb_get_table (&address, rsdt_info);
 294         if (ACPI_FAILURE (status)) {
 295                 goto cleanup;
 296         }
 297
 298         status = acpi_tb_validate_rsdt (rsdt_info->pointer);
 299         if (ACPI_FAILURE (status)) {
 300                 goto cleanup;
 301         }
 302
 303         /* Allocate a scratch table header and table descriptor */
 304
 305         header = ACPI_MEM_ALLOCATE (sizeof (struct acpi_table_header));
 306         if (!header) {
 307                 status = AE_NO_MEMORY;
 308                 goto cleanup;
 309         }
 310
 311         table_info = ACPI_MEM_ALLOCATE (sizeof (struct acpi_table_desc));
 312         if (!table_info) {
 313                 status = AE_NO_MEMORY;
 314                 goto cleanup;
 315         }
 316
 317         /* Get the number of table pointers within the RSDT */
 318
 319         table_count = acpi_tb_get_table_count (acpi_gbl_RSDP, rsdt_info->pointer);
 320         address.pointer_type = acpi_gbl_table_flags | flags;
 321
 322         /*
 323          * Search the RSDT/XSDT for the correct instance of the
 324          * requested table
 325          */
 326         for (i = 0, j = 0; i < table_count; i++) {
 327                 /*
 328                  * Get the next table pointer, handle RSDT vs. XSDT
 329                  * RSDT pointers are 32 bits, XSDT pointers are 64 bits
 330                  */
 331                 if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
 332                         address.pointer.value = (ACPI_CAST_PTR (
 333                                 RSDT_DESCRIPTOR, rsdt_info->pointer))->table_offset_entry[i];
 334                 }
 335                 else {
 336                         address.pointer.value = (ACPI_CAST_PTR (
 337                                 XSDT_DESCRIPTOR, rsdt_info->pointer))->table_offset_entry[i];
 338                 }
 339
 340                 /* Get the table header */
 341
 342                 status = acpi_tb_get_table_header (&address, header);
 343                 if (ACPI_FAILURE (status)) {
 344                         goto cleanup;
 345                 }
 346
 347                 /* Compare table signatures and table instance */
 348
 349                 if (!ACPI_STRNCMP (header->signature, signature, ACPI_NAME_SIZE)) {
 350                         /* An instance of the table was found */
 351
 352                         j++;
 353                         if (j >= instance) {
 354                                 /* Found the correct instance, get the entire table */
 355
 356                                 status = acpi_tb_get_table_body (&address, header, table_info);
 357                                 if (ACPI_FAILURE (status)) {
 358                                         goto cleanup;
 359                                 }
 360
 361                                 *table_pointer = table_info->pointer;
 362                                 goto cleanup;
 363                         }
 364                 }
 365         }
 366
 367         /* Did not find the table */
 368
 369         status = AE_NOT_EXIST;
 370
 371
 372 cleanup:
 373         if (rsdt_info->pointer) {
 374                 acpi_os_unmap_memory (rsdt_info->pointer,
 375                         (acpi_size) rsdt_info->pointer->length);
 376         }
 377         ACPI_MEM_FREE (rsdt_info);
 378
 379         if (header) {
 380                 ACPI_MEM_FREE (header);
 381         }
 382         if (table_info) {
 383                 ACPI_MEM_FREE (table_info);
 384         }
 385         return_ACPI_STATUS (status);
 386 }
 387 EXPORT_SYMBOL(acpi_get_firmware_table);
 388
 389
 390 /* TBD: Move to a new file */
 391
 392 #if ACPI_MACHINE_WIDTH != 16
 393
 394 /*******************************************************************************
 395  *
 396  * FUNCTION:    acpi_find_root_pointer
 397  *
 398  * PARAMETERS:  Flags                   - Logical/Physical addressing
 399  *              rsdp_address            - Where to place the RSDP address
 400  *
 401  * RETURN:      Status, Physical address of the RSDP
 402  *
 403  * DESCRIPTION: Find the RSDP
 404  *
 405  ******************************************************************************/
 406
 407 acpi_status
 408 acpi_find_root_pointer (
 409         u32                             flags,
 410         struct acpi_pointer             *rsdp_address)
 411 {
 412         struct acpi_table_desc          table_info;
 413         acpi_status                     status;
 414
 415
 416         ACPI_FUNCTION_TRACE ("acpi_find_root_pointer");
 417
 418
 419         /* Get the RSDP */
 420
 421         status = acpi_tb_find_rsdp (&table_info, flags);
 422         if (ACPI_FAILURE (status)) {
 423                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 424                         "RSDP structure not found, %s Flags=%X\n",
 425                         acpi_format_exception (status), flags));
 426
 427                 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
 428         }
 429
 430         rsdp_address->pointer_type = ACPI_PHYSICAL_POINTER;
 431         rsdp_address->pointer.physical = table_info.physical_address;
 432         return_ACPI_STATUS (AE_OK);
 433 }
 434
 435
 436 /*******************************************************************************
 437  *
 438  * FUNCTION:    acpi_tb_scan_memory_for_rsdp
 439  *
 440  * PARAMETERS:  start_address       - Starting pointer for search
 441  *              Length              - Maximum length to search
 442  *
 443  * RETURN:      Pointer to the RSDP if found, otherwise NULL.
 444  *
 445  * DESCRIPTION: Search a block of memory for the RSDP signature
 446  *
 447  ******************************************************************************/
 448
 449 static u8 *
 450 acpi_tb_scan_memory_for_rsdp (
 451         u8                              *start_address,
 452         u32                             length)
 453 {
 454         acpi_status                     status;
 455         u8                              *mem_rover;
 456         u8                              *end_address;
 457
 458
 459         ACPI_FUNCTION_TRACE ("tb_scan_memory_for_rsdp");
 460
 461
 462         end_address = start_address + length;
 463
 464         /* Search from given start address for the requested length */
 465
 466         for (mem_rover = start_address; mem_rover < end_address;
 467                  mem_rover += ACPI_RSDP_SCAN_STEP) {
 468                 /* The RSDP signature and checksum must both be correct */
 469
 470                 status = acpi_tb_validate_rsdp (ACPI_CAST_PTR (struct rsdp_descriptor, mem_rover));
 471                 if (ACPI_SUCCESS (status)) {
 472                         /* Sig and checksum valid, we have found a real RSDP */
 473
 474                         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 475                                 "RSDP located at physical address %p\n", mem_rover));
 476                         return_PTR (mem_rover);
 477                 }
 478
 479                 /* No sig match or bad checksum, keep searching */
 480         }
 481
 482         /* Searched entire block, no RSDP was found */
 483
 484         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 485                 "Searched entire block from %p, valid RSDP was not found\n",
 486                 start_address));
 487         return_PTR (NULL);
 488 }
 489
 490
 491 /*******************************************************************************
 492  *
 493  * FUNCTION:    acpi_tb_find_rsdp
 494  *
 495  * PARAMETERS:  table_info              - Where the table info is returned
 496  *              Flags                   - Current memory mode (logical vs.
 497  *                                        physical addressing)
 498  *
 499  * RETURN:      Status, RSDP physical address
 500  *
 501  * DESCRIPTION: search lower 1_mbyte of memory for the root system descriptor
 502  *              pointer structure.  If it is found, set *RSDP to point to it.
 503  *
 504  *              NOTE1: The RSDp must be either in the first 1_k of the Extended
 505  *              BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.)
 506  *              Only a 32-bit physical address is necessary.
 507  *
 508  *              NOTE2: This function is always available, regardless of the
 509  *              initialization state of the rest of ACPI.
 510  *
 511  ******************************************************************************/
 512
 513 static acpi_status
 514 acpi_tb_find_rsdp (
 515         struct acpi_table_desc          *table_info,
 516         u32                             flags)
 517 {
 518         u8                              *table_ptr;
 519         u8                              *mem_rover;
 520         u32                             physical_address;
 521         acpi_status                     status;
 522
 523
 524         ACPI_FUNCTION_TRACE ("tb_find_rsdp");
 525
 526
 527         /*
 528          * Scan supports either logical addressing or physical addressing
 529          */
 530         if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
 531                 /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */
 532
 533                 status = acpi_os_map_memory (
 534                                  (acpi_physical_address) ACPI_EBDA_PTR_LOCATION,
 535                                  ACPI_EBDA_PTR_LENGTH, (void *) &table_ptr);
 536                 if (ACPI_FAILURE (status)) {
 537                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 538                                 "Could not map memory at %8.8X for length %X\n",
 539                                 ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH));
 540
 541                         return_ACPI_STATUS (status);
 542                 }
 543
 544                 ACPI_MOVE_16_TO_32 (&physical_address, table_ptr);
 545
 546                 /* Convert segment part to physical address */
 547
 548                 physical_address <<= 4;
 549                 acpi_os_unmap_memory (table_ptr, ACPI_EBDA_PTR_LENGTH);
 550
 551                 /* EBDA present? */
 552
 553                 if (physical_address > 0x400) {
 554                         /*
 555                          * 1b) Search EBDA paragraphs (EBDa is required to be a
 556                          *     minimum of 1_k length)
 557                          */
 558                         status = acpi_os_map_memory (
 559                                          (acpi_physical_address) physical_address,
 560                                          ACPI_EBDA_WINDOW_SIZE, (void *) &table_ptr);
 561                         if (ACPI_FAILURE (status)) {
 562                                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 563                                         "Could not map memory at %8.8X for length %X\n",
 564                                         physical_address, ACPI_EBDA_WINDOW_SIZE));
 565
 566                                 return_ACPI_STATUS (status);
 567                         }
 568
 569                         mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr,
 570                                           ACPI_EBDA_WINDOW_SIZE);
 571                         acpi_os_unmap_memory (table_ptr, ACPI_EBDA_WINDOW_SIZE);
 572
 573                         if (mem_rover) {
 574                                 /* Return the physical address */
 575
 576                                 physical_address += ACPI_PTR_DIFF (mem_rover, table_ptr);
 577
 578                                 table_info->physical_address =
 579                                         (acpi_physical_address) physical_address;
 580                                 return_ACPI_STATUS (AE_OK);
 581                         }
 582                 }
 583
 584                 /*
 585                  * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh
 586                  */
 587                 status = acpi_os_map_memory (
 588                                  (acpi_physical_address) ACPI_HI_RSDP_WINDOW_BASE,
 589                                  ACPI_HI_RSDP_WINDOW_SIZE, (void *) &table_ptr);
 590
 591                 if (ACPI_FAILURE (status)) {
 592                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 593                                 "Could not map memory at %8.8X for length %X\n",
 594                                 ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE));
 595
 596                         return_ACPI_STATUS (status);
 597                 }
 598
 599                 mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
 600                 acpi_os_unmap_memory (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE);
 601
 602                 if (mem_rover) {
 603                         /* Return the physical address */
 604
 605                         physical_address =
 606                                 ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (mem_rover, table_ptr);
 607
 608                         table_info->physical_address =
 609                                 (acpi_physical_address) physical_address;
 610                         return_ACPI_STATUS (AE_OK);
 611                 }
 612         }
 613
 614         /*
 615          * Physical addressing
 616          */
 617         else {
 618                 /* 1a) Get the location of the EBDA */
 619
 620                 ACPI_MOVE_16_TO_32 (&physical_address, ACPI_EBDA_PTR_LOCATION);
 621                 physical_address <<= 4;     /* Convert segment to physical address */
 622
 623                 /* EBDA present? */
 624
 625                 if (physical_address > 0x400) {
 626                         /*
 627                          * 1b) Search EBDA paragraphs (EBDa is required to be a minimum of
 628                          *     1_k length)
 629                          */
 630                         mem_rover = acpi_tb_scan_memory_for_rsdp (
 631                                           ACPI_PHYSADDR_TO_PTR (physical_address),
 632                                           ACPI_EBDA_WINDOW_SIZE);
 633                         if (mem_rover) {
 634                                 /* Return the physical address */
 635
 636                                 table_info->physical_address = ACPI_TO_INTEGER (mem_rover);
 637                                 return_ACPI_STATUS (AE_OK);
 638                         }
 639                 }
 640
 641                 /* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh */
 642
 643                 mem_rover = acpi_tb_scan_memory_for_rsdp (
 644                                   ACPI_PHYSADDR_TO_PTR (ACPI_HI_RSDP_WINDOW_BASE),
 645                                   ACPI_HI_RSDP_WINDOW_SIZE);
 646                 if (mem_rover) {
 647                         /* Found it, return the physical address */
 648
 649                         table_info->physical_address = ACPI_TO_INTEGER (mem_rover);
 650                         return_ACPI_STATUS (AE_OK);
 651                 }
 652         }
 653
 654         /* A valid RSDP was not found */
 655
 656         ACPI_REPORT_ERROR (("No valid RSDP was found\n"));
 657         return_ACPI_STATUS (AE_NOT_FOUND);
 658 }
 659
 660 #endif
 661