git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/utilities/utmisc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utmisc - common utility procedures
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, 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/acnamesp.h>
  48
  49 #define _COMPONENT          ACPI_UTILITIES
  50 ACPI_MODULE_NAME("utmisc")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_ut_is_aml_table
  55  *
  56  * PARAMETERS:  Table               - An ACPI table
  57  *
  58  * RETURN:      TRUE if table contains executable AML; FALSE otherwise
  59  *
  60  * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
  61  *              Currently, these are DSDT,SSDT,PSDT. All other table types are
  62  *              data tables that do not contain AML code.
  63  *
  64  ******************************************************************************/
  65 u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
  66 {
  67
  68         /* These are the only tables that contain executable AML */
  69
  70         if (ACPI_COMPARE_NAME(table->signature, DSDT_SIG) ||
  71             ACPI_COMPARE_NAME(table->signature, PSDT_SIG) ||
  72             ACPI_COMPARE_NAME(table->signature, SSDT_SIG)) {
  73                 return (TRUE);
  74         }
  75
  76         return (FALSE);
  77 }
  78
  79 /*******************************************************************************
  80  *
  81  * FUNCTION:    acpi_ut_allocate_owner_id
  82  *
  83  * PARAMETERS:  owner_id        - Where the new owner ID is returned
  84  *
  85  * RETURN:      Status
  86  *
  87  * DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
  88  *              track objects created by the table or method, to be deleted
  89  *              when the method exits or the table is unloaded.
  90  *
  91  ******************************************************************************/
  92
  93 acpi_status acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)
  94 {
  95         acpi_native_uint i;
  96         acpi_native_uint j;
  97         acpi_native_uint k;
  98         acpi_status status;
  99
 100         ACPI_FUNCTION_TRACE(ut_allocate_owner_id);
 101
 102         /* Guard against multiple allocations of ID to the same location */
 103
 104         if (*owner_id) {
 105                 ACPI_ERROR((AE_INFO, "Owner ID [%2.2X] already exists",
 106                             *owner_id));
 107                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 108         }
 109
 110         /* Mutex for the global ID mask */
 111
 112         status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
 113         if (ACPI_FAILURE(status)) {
 114                 return_ACPI_STATUS(status);
 115         }
 116
 117         /*
 118          * Find a free owner ID, cycle through all possible IDs on repeated
 119          * allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index may have
 120          * to be scanned twice.
 121          */
 122         for (i = 0, j = acpi_gbl_last_owner_id_index;
 123              i < (ACPI_NUM_OWNERID_MASKS + 1); i++, j++) {
 124                 if (j >= ACPI_NUM_OWNERID_MASKS) {
 125                         j = 0;  /* Wraparound to start of mask array */
 126                 }
 127
 128                 for (k = acpi_gbl_next_owner_id_offset; k < 32; k++) {
 129                         if (acpi_gbl_owner_id_mask[j] == ACPI_UINT32_MAX) {
 130
 131                                 /* There are no free IDs in this mask */
 132
 133                                 break;
 134                         }
 135
 136                         if (!(acpi_gbl_owner_id_mask[j] & (1 << k))) {
 137                                 /*
 138                                  * Found a free ID. The actual ID is the bit index plus one,
 139                                  * making zero an invalid Owner ID. Save this as the last ID
 140                                  * allocated and update the global ID mask.
 141                                  */
 142                                 acpi_gbl_owner_id_mask[j] |= (1 << k);
 143
 144                                 acpi_gbl_last_owner_id_index = (u8) j;
 145                                 acpi_gbl_next_owner_id_offset = (u8) (k + 1);
 146
 147                                 /*
 148                                  * Construct encoded ID from the index and bit position
 149                                  *
 150                                  * Note: Last [j].k (bit 255) is never used and is marked
 151                                  * permanently allocated (prevents +1 overflow)
 152                                  */
 153                                 *owner_id =
 154                                     (acpi_owner_id) ((k + 1) + ACPI_MUL_32(j));
 155
 156                                 ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
 157                                                   "Allocated OwnerId: %2.2X\n",
 158                                                   (unsigned int)*owner_id));
 159                                 goto exit;
 160                         }
 161                 }
 162
 163                 acpi_gbl_next_owner_id_offset = 0;
 164         }
 165
 166         /*
 167          * All owner_ids have been allocated. This typically should
 168          * not happen since the IDs are reused after deallocation. The IDs are
 169          * allocated upon table load (one per table) and method execution, and
 170          * they are released when a table is unloaded or a method completes
 171          * execution.
 172          *
 173          * If this error happens, there may be very deep nesting of invoked control
 174          * methods, or there may be a bug where the IDs are not released.
 175          */
 176         status = AE_OWNER_ID_LIMIT;
 177         ACPI_ERROR((AE_INFO,
 178                     "Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT"));
 179
 180       exit:
 181         (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
 182         return_ACPI_STATUS(status);
 183 }
 184
 185 /*******************************************************************************
 186  *
 187  * FUNCTION:    acpi_ut_release_owner_id
 188  *
 189  * PARAMETERS:  owner_id_ptr        - Pointer to a previously allocated owner_iD
 190  *
 191  * RETURN:      None. No error is returned because we are either exiting a
 192  *              control method or unloading a table. Either way, we would
 193  *              ignore any error anyway.
 194  *
 195  * DESCRIPTION: Release a table or method owner ID.  Valid IDs are 1 - 255
 196  *
 197  ******************************************************************************/
 198
 199 void acpi_ut_release_owner_id(acpi_owner_id * owner_id_ptr)
 200 {
 201         acpi_owner_id owner_id = *owner_id_ptr;
 202         acpi_status status;
 203         acpi_native_uint index;
 204         u32 bit;
 205
 206         ACPI_FUNCTION_TRACE_U32(ut_release_owner_id, owner_id);
 207
 208         /* Always clear the input owner_id (zero is an invalid ID) */
 209
 210         *owner_id_ptr = 0;
 211
 212         /* Zero is not a valid owner_iD */
 213
 214         if (owner_id == 0) {
 215                 ACPI_ERROR((AE_INFO, "Invalid OwnerId: %2.2X", owner_id));
 216                 return_VOID;
 217         }
 218
 219         /* Mutex for the global ID mask */
 220
 221         status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
 222         if (ACPI_FAILURE(status)) {
 223                 return_VOID;
 224         }
 225
 226         /* Normalize the ID to zero */
 227
 228         owner_id--;
 229
 230         /* Decode ID to index/offset pair */
 231
 232         index = ACPI_DIV_32(owner_id);
 233         bit = 1 << ACPI_MOD_32(owner_id);
 234
 235         /* Free the owner ID only if it is valid */
 236
 237         if (acpi_gbl_owner_id_mask[index] & bit) {
 238                 acpi_gbl_owner_id_mask[index] ^= bit;
 239         } else {
 240                 ACPI_ERROR((AE_INFO,
 241                             "Release of non-allocated OwnerId: %2.2X",
 242                             owner_id + 1));
 243         }
 244
 245         (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
 246         return_VOID;
 247 }
 248
 249 /*******************************************************************************
 250  *
 251  * FUNCTION:    acpi_ut_strupr (strupr)
 252  *
 253  * PARAMETERS:  src_string      - The source string to convert
 254  *
 255  * RETURN:      None
 256  *
 257  * DESCRIPTION: Convert string to uppercase
 258  *
 259  * NOTE: This is not a POSIX function, so it appears here, not in utclib.c
 260  *
 261  ******************************************************************************/
 262
 263 void acpi_ut_strupr(char *src_string)
 264 {
 265         char *string;
 266
 267         ACPI_FUNCTION_ENTRY();
 268
 269         if (!src_string) {
 270                 return;
 271         }
 272
 273         /* Walk entire string, uppercasing the letters */
 274
 275         for (string = src_string; *string; string++) {
 276                 *string = (char)ACPI_TOUPPER(*string);
 277         }
 278
 279         return;
 280 }
 281
 282 /*******************************************************************************
 283  *
 284  * FUNCTION:    acpi_ut_print_string
 285  *
 286  * PARAMETERS:  String          - Null terminated ASCII string
 287  *              max_length      - Maximum output length
 288  *
 289  * RETURN:      None
 290  *
 291  * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
 292  *              sequences.
 293  *
 294  ******************************************************************************/
 295
 296 void acpi_ut_print_string(char *string, u8 max_length)
 297 {
 298         u32 i;
 299
 300         if (!string) {
 301                 acpi_os_printf("<\"NULL STRING PTR\">");
 302                 return;
 303         }
 304
 305         acpi_os_printf("\"");
 306         for (i = 0; string[i] && (i < max_length); i++) {
 307
 308                 /* Escape sequences */
 309
 310                 switch (string[i]) {
 311                 case 0x07:
 312                         acpi_os_printf("\\a");  /* BELL */
 313                         break;
 314
 315                 case 0x08:
 316                         acpi_os_printf("\\b");  /* BACKSPACE */
 317                         break;
 318
 319                 case 0x0C:
 320                         acpi_os_printf("\\f");  /* FORMFEED */
 321                         break;
 322
 323                 case 0x0A:
 324                         acpi_os_printf("\\n");  /* LINEFEED */
 325                         break;
 326
 327                 case 0x0D:
 328                         acpi_os_printf("\\r");  /* CARRIAGE RETURN */
 329                         break;
 330
 331                 case 0x09:
 332                         acpi_os_printf("\\t");  /* HORIZONTAL TAB */
 333                         break;
 334
 335                 case 0x0B:
 336                         acpi_os_printf("\\v");  /* VERTICAL TAB */
 337                         break;
 338
 339                 case '\'':      /* Single Quote */
 340                 case '\"':      /* Double Quote */
 341                 case '\\':      /* Backslash */
 342                         acpi_os_printf("\\%c", (int)string[i]);
 343                         break;
 344
 345                 default:
 346
 347                         /* Check for printable character or hex escape */
 348
 349                         if (ACPI_IS_PRINT(string[i])) {
 350                                 /* This is a normal character */
 351
 352                                 acpi_os_printf("%c", (int)string[i]);
 353                         } else {
 354                                 /* All others will be Hex escapes */
 355
 356                                 acpi_os_printf("\\x%2.2X", (s32) string[i]);
 357                         }
 358                         break;
 359                 }
 360         }
 361         acpi_os_printf("\"");
 362
 363         if (i == max_length && string[i]) {
 364                 acpi_os_printf("...");
 365         }
 366 }
 367
 368 /*******************************************************************************
 369  *
 370  * FUNCTION:    acpi_ut_dword_byte_swap
 371  *
 372  * PARAMETERS:  Value           - Value to be converted
 373  *
 374  * RETURN:      u32 integer with bytes swapped
 375  *
 376  * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
 377  *
 378  ******************************************************************************/
 379
 380 u32 acpi_ut_dword_byte_swap(u32 value)
 381 {
 382         union {
 383                 u32 value;
 384                 u8 bytes[4];
 385         } out;
 386         union {
 387                 u32 value;
 388                 u8 bytes[4];
 389         } in;
 390
 391         ACPI_FUNCTION_ENTRY();
 392
 393         in.value = value;
 394
 395         out.bytes[0] = in.bytes[3];
 396         out.bytes[1] = in.bytes[2];
 397         out.bytes[2] = in.bytes[1];
 398         out.bytes[3] = in.bytes[0];
 399
 400         return (out.value);
 401 }
 402
 403 /*******************************************************************************
 404  *
 405  * FUNCTION:    acpi_ut_set_integer_width
 406  *
 407  * PARAMETERS:  Revision            From DSDT header
 408  *
 409  * RETURN:      None
 410  *
 411  * DESCRIPTION: Set the global integer bit width based upon the revision
 412  *              of the DSDT.  For Revision 1 and 0, Integers are 32 bits.
 413  *              For Revision 2 and above, Integers are 64 bits.  Yes, this
 414  *              makes a difference.
 415  *
 416  ******************************************************************************/
 417
 418 void acpi_ut_set_integer_width(u8 revision)
 419 {
 420
 421         if (revision <= 1) {
 422
 423                 /* 32-bit case */
 424
 425                 acpi_gbl_integer_bit_width = 32;
 426                 acpi_gbl_integer_nybble_width = 8;
 427                 acpi_gbl_integer_byte_width = 4;
 428         } else {
 429                 /* 64-bit case (ACPI 2.0+) */
 430
 431                 acpi_gbl_integer_bit_width = 64;
 432                 acpi_gbl_integer_nybble_width = 16;
 433                 acpi_gbl_integer_byte_width = 8;
 434         }
 435 }
 436
 437 #ifdef ACPI_DEBUG_OUTPUT
 438 /*******************************************************************************
 439  *
 440  * FUNCTION:    acpi_ut_display_init_pathname
 441  *
 442  * PARAMETERS:  Type                - Object type of the node
 443  *              obj_handle          - Handle whose pathname will be displayed
 444  *              Path                - Additional path string to be appended.
 445  *                                      (NULL if no extra path)
 446  *
 447  * RETURN:      acpi_status
 448  *
 449  * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
 450  *
 451  ******************************************************************************/
 452
 453 void
 454 acpi_ut_display_init_pathname(u8 type,
 455                               struct acpi_namespace_node *obj_handle,
 456                               char *path)
 457 {
 458         acpi_status status;
 459         struct acpi_buffer buffer;
 460
 461         ACPI_FUNCTION_ENTRY();
 462
 463         /* Only print the path if the appropriate debug level is enabled */
 464
 465         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 466                 return;
 467         }
 468
 469         /* Get the full pathname to the node */
 470
 471         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 472         status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
 473         if (ACPI_FAILURE(status)) {
 474                 return;
 475         }
 476
 477         /* Print what we're doing */
 478
 479         switch (type) {
 480         case ACPI_TYPE_METHOD:
 481                 acpi_os_printf("Executing  ");
 482                 break;
 483
 484         default:
 485                 acpi_os_printf("Initializing ");
 486                 break;
 487         }
 488
 489         /* Print the object type and pathname */
 490
 491         acpi_os_printf("%-12s %s",
 492                        acpi_ut_get_type_name(type), (char *)buffer.pointer);
 493
 494         /* Extra path is used to append names like _STA, _INI, etc. */
 495
 496         if (path) {
 497                 acpi_os_printf(".%s", path);
 498         }
 499         acpi_os_printf("\n");
 500
 501         ACPI_FREE(buffer.pointer);
 502 }
 503 #endif
 504
 505 /*******************************************************************************
 506  *
 507  * FUNCTION:    acpi_ut_valid_acpi_char
 508  *
 509  * PARAMETERS:  Char            - The character to be examined
 510  *              Position        - Byte position (0-3)
 511  *
 512  * RETURN:      TRUE if the character is valid, FALSE otherwise
 513  *
 514  * DESCRIPTION: Check for a valid ACPI character. Must be one of:
 515  *              1) Upper case alpha
 516  *              2) numeric
 517  *              3) underscore
 518  *
 519  *              We allow a '!' as the last character because of the ASF! table
 520  *
 521  ******************************************************************************/
 522
 523 u8 acpi_ut_valid_acpi_char(char character, acpi_native_uint position)
 524 {
 525
 526         if (!((character >= 'A' && character <= 'Z') ||
 527               (character >= '0' && character <= '9') || (character == '_'))) {
 528
 529                 /* Allow a '!' in the last position */
 530
 531                 if (character == '!' && position == 3) {
 532                         return (TRUE);
 533                 }
 534
 535                 return (FALSE);
 536         }
 537
 538         return (TRUE);
 539 }
 540
 541 /*******************************************************************************
 542  *
 543  * FUNCTION:    acpi_ut_valid_acpi_name
 544  *
 545  * PARAMETERS:  Name            - The name to be examined
 546  *
 547  * RETURN:      TRUE if the name is valid, FALSE otherwise
 548  *
 549  * DESCRIPTION: Check for a valid ACPI name.  Each character must be one of:
 550  *              1) Upper case alpha
 551  *              2) numeric
 552  *              3) underscore
 553  *
 554  ******************************************************************************/
 555
 556 u8 acpi_ut_valid_acpi_name(u32 name)
 557 {
 558         acpi_native_uint i;
 559
 560         ACPI_FUNCTION_ENTRY();
 561
 562         for (i = 0; i < ACPI_NAME_SIZE; i++) {
 563                 if (!acpi_ut_valid_acpi_char
 564                     ((ACPI_CAST_PTR(char, &name))[i], i)) {
 565                         return (FALSE);
 566                 }
 567         }
 568
 569         return (TRUE);
 570 }
 571
 572 /*******************************************************************************
 573  *
 574  * FUNCTION:    acpi_ut_repair_name
 575  *
 576  * PARAMETERS:  Name            - The ACPI name to be repaired
 577  *
 578  * RETURN:      Repaired version of the name
 579  *
 580  * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
 581  *              return the new name.
 582  *
 583  ******************************************************************************/
 584
 585 acpi_name acpi_ut_repair_name(acpi_name name)
 586 {
 587         char *name_ptr = ACPI_CAST_PTR(char, &name);
 588         char new_name[ACPI_NAME_SIZE];
 589         acpi_native_uint i;
 590
 591         for (i = 0; i < ACPI_NAME_SIZE; i++) {
 592                 new_name[i] = name_ptr[i];
 593
 594                 /*
 595                  * Replace a bad character with something printable, yet technically
 596                  * still invalid. This prevents any collisions with existing "good"
 597                  * names in the namespace.
 598                  */
 599                 if (!acpi_ut_valid_acpi_char(name_ptr[i], i)) {
 600                         new_name[i] = '*';
 601                 }
 602         }
 603
 604         return (*ACPI_CAST_PTR(u32, new_name));
 605 }
 606
 607 /*******************************************************************************
 608  *
 609  * FUNCTION:    acpi_ut_strtoul64
 610  *
 611  * PARAMETERS:  String          - Null terminated string
 612  *              Base            - Radix of the string: 16 or ACPI_ANY_BASE;
 613  *                                ACPI_ANY_BASE means 'in behalf of to_integer'
 614  *              ret_integer     - Where the converted integer is returned
 615  *
 616  * RETURN:      Status and Converted value
 617  *
 618  * DESCRIPTION: Convert a string into an unsigned value. Performs either a
 619  *              32-bit or 64-bit conversion, depending on the current mode
 620  *              of the interpreter.
 621  *              NOTE: Does not support Octal strings, not needed.
 622  *
 623  ******************************************************************************/
 624
 625 acpi_status
 626 acpi_ut_strtoul64(char *string, u32 base, acpi_integer * ret_integer)
 627 {
 628         u32 this_digit = 0;
 629         acpi_integer return_value = 0;
 630         acpi_integer quotient;
 631         acpi_integer dividend;
 632         u32 to_integer_op = (base == ACPI_ANY_BASE);
 633         u32 mode32 = (acpi_gbl_integer_byte_width == 4);
 634         u8 valid_digits = 0;
 635         u8 sign_of0x = 0;
 636         u8 term = 0;
 637
 638         ACPI_FUNCTION_TRACE_STR(ut_stroul64, string);
 639
 640         switch (base) {
 641         case ACPI_ANY_BASE:
 642         case 16:
 643                 break;
 644
 645         default:
 646                 /* Invalid Base */
 647                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 648         }
 649
 650         if (!string) {
 651                 goto error_exit;
 652         }
 653
 654         /* Skip over any white space in the buffer */
 655
 656         while ((*string) && (ACPI_IS_SPACE(*string) || *string == '\t')) {
 657                 string++;
 658         }
 659
 660         if (to_integer_op) {
 661                 /*
 662                  * Base equal to ACPI_ANY_BASE means 'to_integer operation case'.
 663                  * We need to determine if it is decimal or hexadecimal.
 664                  */
 665                 if ((*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
 666                         sign_of0x = 1;
 667                         base = 16;
 668
 669                         /* Skip over the leading '0x' */
 670                         string += 2;
 671                 } else {
 672                         base = 10;
 673                 }
 674         }
 675
 676         /* Any string left? Check that '0x' is not followed by white space. */
 677
 678         if (!(*string) || ACPI_IS_SPACE(*string) || *string == '\t') {
 679                 if (to_integer_op) {
 680                         goto error_exit;
 681                 } else {
 682                         goto all_done;
 683                 }
 684         }
 685
 686         /*
 687          * Perform a 32-bit or 64-bit conversion, depending upon the current
 688          * execution mode of the interpreter
 689          */
 690         dividend = (mode32) ? ACPI_UINT32_MAX : ACPI_UINT64_MAX;
 691
 692         /* Main loop: convert the string to a 32- or 64-bit integer */
 693
 694         while (*string) {
 695                 if (ACPI_IS_DIGIT(*string)) {
 696
 697                         /* Convert ASCII 0-9 to Decimal value */
 698
 699                         this_digit = ((u8) * string) - '0';
 700                 } else if (base == 10) {
 701
 702                         /* Digit is out of range; possible in to_integer case only */
 703
 704                         term = 1;
 705                 } else {
 706                         this_digit = (u8) ACPI_TOUPPER(*string);
 707                         if (ACPI_IS_XDIGIT((char)this_digit)) {
 708
 709                                 /* Convert ASCII Hex char to value */
 710
 711                                 this_digit = this_digit - 'A' + 10;
 712                         } else {
 713                                 term = 1;
 714                         }
 715                 }
 716
 717                 if (term) {
 718                         if (to_integer_op) {
 719                                 goto error_exit;
 720                         } else {
 721                                 break;
 722                         }
 723                 } else if ((valid_digits == 0) && (this_digit == 0)
 724                            && !sign_of0x) {
 725
 726                         /* Skip zeros */
 727                         string++;
 728                         continue;
 729                 }
 730
 731                 valid_digits++;
 732
 733                 if (sign_of0x
 734                     && ((valid_digits > 16)
 735                         || ((valid_digits > 8) && mode32))) {
 736                         /*
 737                          * This is to_integer operation case.
 738                          * No any restrictions for string-to-integer conversion,
 739                          * see ACPI spec.
 740                          */
 741                         goto error_exit;
 742                 }
 743
 744                 /* Divide the digit into the correct position */
 745
 746                 (void)
 747                     acpi_ut_short_divide((dividend - (acpi_integer) this_digit),
 748                                          base, &quotient, NULL);
 749
 750                 if (return_value > quotient) {
 751                         if (to_integer_op) {
 752                                 goto error_exit;
 753                         } else {
 754                                 break;
 755                         }
 756                 }
 757
 758                 return_value *= base;
 759                 return_value += this_digit;
 760                 string++;
 761         }
 762
 763         /* All done, normal exit */
 764
 765       all_done:
 766
 767         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
 768                           ACPI_FORMAT_UINT64(return_value)));
 769
 770         *ret_integer = return_value;
 771         return_ACPI_STATUS(AE_OK);
 772
 773       error_exit:
 774         /* Base was set/validated above */
 775
 776         if (base == 10) {
 777                 return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
 778         } else {
 779                 return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
 780         }
 781 }
 782
 783 /*******************************************************************************
 784  *
 785  * FUNCTION:    acpi_ut_create_update_state_and_push
 786  *
 787  * PARAMETERS:  Object          - Object to be added to the new state
 788  *              Action          - Increment/Decrement
 789  *              state_list      - List the state will be added to
 790  *
 791  * RETURN:      Status
 792  *
 793  * DESCRIPTION: Create a new state and push it
 794  *
 795  ******************************************************************************/
 796
 797 acpi_status
 798 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
 799                                      u16 action,
 800                                      union acpi_generic_state **state_list)
 801 {
 802         union acpi_generic_state *state;
 803
 804         ACPI_FUNCTION_ENTRY();
 805
 806         /* Ignore null objects; these are expected */
 807
 808         if (!object) {
 809                 return (AE_OK);
 810         }
 811
 812         state = acpi_ut_create_update_state(object, action);
 813         if (!state) {
 814                 return (AE_NO_MEMORY);
 815         }
 816
 817         acpi_ut_push_generic_state(state_list, state);
 818         return (AE_OK);
 819 }
 820
 821 /*******************************************************************************
 822  *
 823  * FUNCTION:    acpi_ut_walk_package_tree
 824  *
 825  * PARAMETERS:  source_object       - The package to walk
 826  *              target_object       - Target object (if package is being copied)
 827  *              walk_callback       - Called once for each package element
 828  *              Context             - Passed to the callback function
 829  *
 830  * RETURN:      Status
 831  *
 832  * DESCRIPTION: Walk through a package
 833  *
 834  ******************************************************************************/
 835
 836 acpi_status
 837 acpi_ut_walk_package_tree(union acpi_operand_object * source_object,
 838                           void *target_object,
 839                           acpi_pkg_callback walk_callback, void *context)
 840 {
 841         acpi_status status = AE_OK;
 842         union acpi_generic_state *state_list = NULL;
 843         union acpi_generic_state *state;
 844         u32 this_index;
 845         union acpi_operand_object *this_source_obj;
 846
 847         ACPI_FUNCTION_TRACE(ut_walk_package_tree);
 848
 849         state = acpi_ut_create_pkg_state(source_object, target_object, 0);
 850         if (!state) {
 851                 return_ACPI_STATUS(AE_NO_MEMORY);
 852         }
 853
 854         while (state) {
 855
 856                 /* Get one element of the package */
 857
 858                 this_index = state->pkg.index;
 859                 this_source_obj = (union acpi_operand_object *)
 860                     state->pkg.source_object->package.elements[this_index];
 861
 862                 /*
 863                  * Check for:
 864                  * 1) An uninitialized package element.  It is completely
 865                  *    legal to declare a package and leave it uninitialized
 866                  * 2) Not an internal object - can be a namespace node instead
 867                  * 3) Any type other than a package.  Packages are handled in else
 868                  *    case below.
 869                  */
 870                 if ((!this_source_obj) ||
 871                     (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
 872                      ACPI_DESC_TYPE_OPERAND)
 873                     || (ACPI_GET_OBJECT_TYPE(this_source_obj) !=
 874                         ACPI_TYPE_PACKAGE)) {
 875                         status =
 876                             walk_callback(ACPI_COPY_TYPE_SIMPLE,
 877                                           this_source_obj, state, context);
 878                         if (ACPI_FAILURE(status)) {
 879                                 return_ACPI_STATUS(status);
 880                         }
 881
 882                         state->pkg.index++;
 883                         while (state->pkg.index >=
 884                                state->pkg.source_object->package.count) {
 885                                 /*
 886                                  * We've handled all of the objects at this level,  This means
 887                                  * that we have just completed a package.  That package may
 888                                  * have contained one or more packages itself.
 889                                  *
 890                                  * Delete this state and pop the previous state (package).
 891                                  */
 892                                 acpi_ut_delete_generic_state(state);
 893                                 state = acpi_ut_pop_generic_state(&state_list);
 894
 895                                 /* Finished when there are no more states */
 896
 897                                 if (!state) {
 898                                         /*
 899                                          * We have handled all of the objects in the top level
 900                                          * package just add the length of the package objects
 901                                          * and exit
 902                                          */
 903                                         return_ACPI_STATUS(AE_OK);
 904                                 }
 905
 906                                 /*
 907                                  * Go back up a level and move the index past the just
 908                                  * completed package object.
 909                                  */
 910                                 state->pkg.index++;
 911                         }
 912                 } else {
 913                         /* This is a subobject of type package */
 914
 915                         status =
 916                             walk_callback(ACPI_COPY_TYPE_PACKAGE,
 917                                           this_source_obj, state, context);
 918                         if (ACPI_FAILURE(status)) {
 919                                 return_ACPI_STATUS(status);
 920                         }
 921
 922                         /*
 923                          * Push the current state and create a new one
 924                          * The callback above returned a new target package object.
 925                          */
 926                         acpi_ut_push_generic_state(&state_list, state);
 927                         state = acpi_ut_create_pkg_state(this_source_obj,
 928                                                          state->pkg.
 929                                                          this_target_obj, 0);
 930                         if (!state) {
 931                                 return_ACPI_STATUS(AE_NO_MEMORY);
 932                         }
 933                 }
 934         }
 935
 936         /* We should never get here */
 937
 938         return_ACPI_STATUS(AE_AML_INTERNAL);
 939 }
 940
 941 /*******************************************************************************
 942  *
 943  * FUNCTION:    acpi_ut_error, acpi_ut_warning, acpi_ut_info
 944  *
 945  * PARAMETERS:  module_name         - Caller's module name (for error output)
 946  *              line_number         - Caller's line number (for error output)
 947  *              Format              - Printf format string + additional args
 948  *
 949  * RETURN:      None
 950  *
 951  * DESCRIPTION: Print message with module/line/version info
 952  *
 953  ******************************************************************************/
 954
 955 void ACPI_INTERNAL_VAR_XFACE
 956 acpi_ut_error(char *module_name, u32 line_number, char *format, ...)
 957 {
 958         va_list args;
 959
 960         acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
 961
 962         va_start(args, format);
 963         acpi_os_vprintf(format, args);
 964         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 965 }
 966
 967 void ACPI_INTERNAL_VAR_XFACE
 968 acpi_ut_exception(char *module_name,
 969                   u32 line_number, acpi_status status, char *format, ...)
 970 {
 971         va_list args;
 972
 973         acpi_os_printf("ACPI Exception (%s-%04d): %s, ", module_name,
 974                        line_number, acpi_format_exception(status));
 975
 976         va_start(args, format);
 977         acpi_os_vprintf(format, args);
 978         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 979 }
 980 EXPORT_SYMBOL(acpi_ut_exception);
 981
 982 void ACPI_INTERNAL_VAR_XFACE
 983 acpi_ut_warning(char *module_name, u32 line_number, char *format, ...)
 984 {
 985         va_list args;
 986
 987         acpi_os_printf("ACPI Warning (%s-%04d): ", module_name, line_number);
 988
 989         va_start(args, format);
 990         acpi_os_vprintf(format, args);
 991         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 992 }
 993
 994 void ACPI_INTERNAL_VAR_XFACE
 995 acpi_ut_info(char *module_name, u32 line_number, char *format, ...)
 996 {
 997         va_list args;
 998
 999         acpi_os_printf("ACPI (%s-%04d): ", module_name, line_number);
1000
1001         va_start(args, format);
1002         acpi_os_vprintf(format, args);
1003         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
1004 }