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         /* Ignore tables that contain 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                 acpi_gbl_integer_bit_width = 32;
 423                 acpi_gbl_integer_nybble_width = 8;
 424                 acpi_gbl_integer_byte_width = 4;
 425         } else {
 426                 acpi_gbl_integer_bit_width = 64;
 427                 acpi_gbl_integer_nybble_width = 16;
 428                 acpi_gbl_integer_byte_width = 8;
 429         }
 430 }
 431
 432 #ifdef ACPI_DEBUG_OUTPUT
 433 /*******************************************************************************
 434  *
 435  * FUNCTION:    acpi_ut_display_init_pathname
 436  *
 437  * PARAMETERS:  Type                - Object type of the node
 438  *              obj_handle          - Handle whose pathname will be displayed
 439  *              Path                - Additional path string to be appended.
 440  *                                      (NULL if no extra path)
 441  *
 442  * RETURN:      acpi_status
 443  *
 444  * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
 445  *
 446  ******************************************************************************/
 447
 448 void
 449 acpi_ut_display_init_pathname(u8 type,
 450                               struct acpi_namespace_node *obj_handle,
 451                               char *path)
 452 {
 453         acpi_status status;
 454         struct acpi_buffer buffer;
 455
 456         ACPI_FUNCTION_ENTRY();
 457
 458         /* Only print the path if the appropriate debug level is enabled */
 459
 460         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 461                 return;
 462         }
 463
 464         /* Get the full pathname to the node */
 465
 466         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 467         status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
 468         if (ACPI_FAILURE(status)) {
 469                 return;
 470         }
 471
 472         /* Print what we're doing */
 473
 474         switch (type) {
 475         case ACPI_TYPE_METHOD:
 476                 acpi_os_printf("Executing  ");
 477                 break;
 478
 479         default:
 480                 acpi_os_printf("Initializing ");
 481                 break;
 482         }
 483
 484         /* Print the object type and pathname */
 485
 486         acpi_os_printf("%-12s %s",
 487                        acpi_ut_get_type_name(type), (char *)buffer.pointer);
 488
 489         /* Extra path is used to append names like _STA, _INI, etc. */
 490
 491         if (path) {
 492                 acpi_os_printf(".%s", path);
 493         }
 494         acpi_os_printf("\n");
 495
 496         ACPI_FREE(buffer.pointer);
 497 }
 498 #endif
 499
 500 /*******************************************************************************
 501  *
 502  * FUNCTION:    acpi_ut_valid_acpi_char
 503  *
 504  * PARAMETERS:  Char            - The character to be examined
 505  *
 506  * RETURN:      TRUE if the character is valid, FALSE otherwise
 507  *
 508  * DESCRIPTION: Check for a valid ACPI character. Must be one of:
 509  *              1) Upper case alpha
 510  *              2) numeric
 511  *              3) underscore
 512  *
 513  *              We allow a '!' as the last character because of the ASF! table
 514  *
 515  ******************************************************************************/
 516
 517 u8 acpi_ut_valid_acpi_char(char character, acpi_native_uint position)
 518 {
 519
 520         if (!((character >= 'A' && character <= 'Z') ||
 521               (character >= '0' && character <= '9') || (character == '_'))) {
 522
 523                 /* Allow a '!' in the last position */
 524
 525                 if (character == '!' && position == 3) {
 526                         return (TRUE);
 527                 }
 528
 529                 return (FALSE);
 530         }
 531
 532         return (TRUE);
 533 }
 534
 535 /*******************************************************************************
 536  *
 537  * FUNCTION:    acpi_ut_valid_acpi_name
 538  *
 539  * PARAMETERS:  Name            - The name to be examined
 540  *
 541  * RETURN:      TRUE if the name is valid, FALSE otherwise
 542  *
 543  * DESCRIPTION: Check for a valid ACPI name.  Each character must be one of:
 544  *              1) Upper case alpha
 545  *              2) numeric
 546  *              3) underscore
 547  *
 548  ******************************************************************************/
 549
 550 u8 acpi_ut_valid_acpi_name(u32 name)
 551 {
 552         acpi_native_uint i;
 553
 554         ACPI_FUNCTION_ENTRY();
 555
 556         for (i = 0; i < ACPI_NAME_SIZE; i++) {
 557                 if (!acpi_ut_valid_acpi_char
 558                     ((ACPI_CAST_PTR(char, &name))[i], i)) {
 559                         return (FALSE);
 560                 }
 561         }
 562
 563         return (TRUE);
 564 }
 565
 566 /*******************************************************************************
 567  *
 568  * FUNCTION:    acpi_ut_repair_name
 569  *
 570  * PARAMETERS:  Name            - The ACPI name to be repaired
 571  *
 572  * RETURN:      Repaired version of the name
 573  *
 574  * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
 575  *              return the new name.
 576  *
 577  ******************************************************************************/
 578
 579 acpi_name acpi_ut_repair_name(acpi_name name)
 580 {
 581         char *name_ptr = ACPI_CAST_PTR(char, &name);
 582         char new_name[ACPI_NAME_SIZE];
 583         acpi_native_uint i;
 584
 585         for (i = 0; i < ACPI_NAME_SIZE; i++) {
 586                 new_name[i] = name_ptr[i];
 587
 588                 /*
 589                  * Replace a bad character with something printable, yet technically
 590                  * still invalid. This prevents any collisions with existing "good"
 591                  * names in the namespace.
 592                  */
 593                 if (!acpi_ut_valid_acpi_char(name_ptr[i], i)) {
 594                         new_name[i] = '*';
 595                 }
 596         }
 597
 598         return (*ACPI_CAST_PTR(u32, new_name));
 599 }
 600
 601 /*******************************************************************************
 602  *
 603  * FUNCTION:    acpi_ut_strtoul64
 604  *
 605  * PARAMETERS:  String          - Null terminated string
 606  *              Base            - Radix of the string: 16 or ACPI_ANY_BASE;
 607  *                                ACPI_ANY_BASE means 'in behalf of to_integer'
 608  *              ret_integer     - Where the converted integer is returned
 609  *
 610  * RETURN:      Status and Converted value
 611  *
 612  * DESCRIPTION: Convert a string into an unsigned value.
 613  *              NOTE: Does not support Octal strings, not needed.
 614  *
 615  ******************************************************************************/
 616
 617 acpi_status
 618 acpi_ut_strtoul64(char *string, u32 base, acpi_integer * ret_integer)
 619 {
 620         u32 this_digit = 0;
 621         acpi_integer return_value = 0;
 622         acpi_integer quotient;
 623         acpi_integer dividend;
 624         u32 to_integer_op = (base == ACPI_ANY_BASE);
 625         u32 mode32 = (acpi_gbl_integer_byte_width == 4);
 626         u8 valid_digits = 0;
 627         u8 sign_of0x = 0;
 628         u8 term = 0;
 629
 630         ACPI_FUNCTION_TRACE(ut_stroul64);
 631
 632         switch (base) {
 633         case ACPI_ANY_BASE:
 634         case 16:
 635                 break;
 636
 637         default:
 638                 /* Invalid Base */
 639                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 640         }
 641
 642         if (!string) {
 643                 goto error_exit;
 644         }
 645
 646         /* Skip over any white space in the buffer */
 647
 648         while ((*string) && (ACPI_IS_SPACE(*string) || *string == '\t')) {
 649                 string++;
 650         }
 651
 652         if (to_integer_op) {
 653                 /*
 654                  * Base equal to ACPI_ANY_BASE means 'to_integer operation case'.
 655                  * We need to determine if it is decimal or hexadecimal.
 656                  */
 657                 if ((*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
 658                         sign_of0x = 1;
 659                         base = 16;
 660
 661                         /* Skip over the leading '0x' */
 662                         string += 2;
 663                 } else {
 664                         base = 10;
 665                 }
 666         }
 667
 668         /* Any string left? Check that '0x' is not followed by white space. */
 669
 670         if (!(*string) || ACPI_IS_SPACE(*string) || *string == '\t') {
 671                 if (to_integer_op) {
 672                         goto error_exit;
 673                 } else {
 674                         goto all_done;
 675                 }
 676         }
 677
 678         dividend = (mode32) ? ACPI_UINT32_MAX : ACPI_UINT64_MAX;
 679
 680         /* At least one character in the string here */
 681
 682         /* Main loop: convert the string to a 64-bit integer */
 683
 684         while (*string) {
 685                 if (ACPI_IS_DIGIT(*string)) {
 686
 687                         /* Convert ASCII 0-9 to Decimal value */
 688
 689                         this_digit = ((u8) * string) - '0';
 690                 } else if (base == 10) {
 691
 692                         /* Digit is out of range; possible in to_integer case only */
 693
 694                         term = 1;
 695                 } else {
 696                         this_digit = (u8) ACPI_TOUPPER(*string);
 697                         if (ACPI_IS_XDIGIT((char)this_digit)) {
 698
 699                                 /* Convert ASCII Hex char to value */
 700
 701                                 this_digit = this_digit - 'A' + 10;
 702                         } else {
 703                                 term = 1;
 704                         }
 705                 }
 706
 707                 if (term) {
 708                         if (to_integer_op) {
 709                                 goto error_exit;
 710                         } else {
 711                                 break;
 712                         }
 713                 } else if ((valid_digits == 0) && (this_digit == 0)
 714                            && !sign_of0x) {
 715
 716                         /* Skip zeros */
 717                         string++;
 718                         continue;
 719                 }
 720
 721                 valid_digits++;
 722
 723                 if (sign_of0x
 724                     && ((valid_digits > 16)
 725                         || ((valid_digits > 8) && mode32))) {
 726                         /*
 727                          * This is to_integer operation case.
 728                          * No any restrictions for string-to-integer conversion,
 729                          * see ACPI spec.
 730                          */
 731                         goto error_exit;
 732                 }
 733
 734                 /* Divide the digit into the correct position */
 735
 736                 (void)
 737                     acpi_ut_short_divide((dividend - (acpi_integer) this_digit),
 738                                          base, &quotient, NULL);
 739
 740                 if (return_value > quotient) {
 741                         if (to_integer_op) {
 742                                 goto error_exit;
 743                         } else {
 744                                 break;
 745                         }
 746                 }
 747
 748                 return_value *= base;
 749                 return_value += this_digit;
 750                 string++;
 751         }
 752
 753         /* All done, normal exit */
 754
 755       all_done:
 756
 757         *ret_integer = return_value;
 758         return_ACPI_STATUS(AE_OK);
 759
 760       error_exit:
 761         /* Base was set/validated above */
 762
 763         if (base == 10) {
 764                 return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
 765         } else {
 766                 return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
 767         }
 768 }
 769
 770 /*******************************************************************************
 771  *
 772  * FUNCTION:    acpi_ut_create_update_state_and_push
 773  *
 774  * PARAMETERS:  Object          - Object to be added to the new state
 775  *              Action          - Increment/Decrement
 776  *              state_list      - List the state will be added to
 777  *
 778  * RETURN:      Status
 779  *
 780  * DESCRIPTION: Create a new state and push it
 781  *
 782  ******************************************************************************/
 783
 784 acpi_status
 785 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
 786                                      u16 action,
 787                                      union acpi_generic_state **state_list)
 788 {
 789         union acpi_generic_state *state;
 790
 791         ACPI_FUNCTION_ENTRY();
 792
 793         /* Ignore null objects; these are expected */
 794
 795         if (!object) {
 796                 return (AE_OK);
 797         }
 798
 799         state = acpi_ut_create_update_state(object, action);
 800         if (!state) {
 801                 return (AE_NO_MEMORY);
 802         }
 803
 804         acpi_ut_push_generic_state(state_list, state);
 805         return (AE_OK);
 806 }
 807
 808 /*******************************************************************************
 809  *
 810  * FUNCTION:    acpi_ut_walk_package_tree
 811  *
 812  * PARAMETERS:  source_object       - The package to walk
 813  *              target_object       - Target object (if package is being copied)
 814  *              walk_callback       - Called once for each package element
 815  *              Context             - Passed to the callback function
 816  *
 817  * RETURN:      Status
 818  *
 819  * DESCRIPTION: Walk through a package
 820  *
 821  ******************************************************************************/
 822
 823 acpi_status
 824 acpi_ut_walk_package_tree(union acpi_operand_object * source_object,
 825                           void *target_object,
 826                           acpi_pkg_callback walk_callback, void *context)
 827 {
 828         acpi_status status = AE_OK;
 829         union acpi_generic_state *state_list = NULL;
 830         union acpi_generic_state *state;
 831         u32 this_index;
 832         union acpi_operand_object *this_source_obj;
 833
 834         ACPI_FUNCTION_TRACE(ut_walk_package_tree);
 835
 836         state = acpi_ut_create_pkg_state(source_object, target_object, 0);
 837         if (!state) {
 838                 return_ACPI_STATUS(AE_NO_MEMORY);
 839         }
 840
 841         while (state) {
 842
 843                 /* Get one element of the package */
 844
 845                 this_index = state->pkg.index;
 846                 this_source_obj = (union acpi_operand_object *)
 847                     state->pkg.source_object->package.elements[this_index];
 848
 849                 /*
 850                  * Check for:
 851                  * 1) An uninitialized package element.  It is completely
 852                  *    legal to declare a package and leave it uninitialized
 853                  * 2) Not an internal object - can be a namespace node instead
 854                  * 3) Any type other than a package.  Packages are handled in else
 855                  *    case below.
 856                  */
 857                 if ((!this_source_obj) ||
 858                     (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
 859                      ACPI_DESC_TYPE_OPERAND)
 860                     || (ACPI_GET_OBJECT_TYPE(this_source_obj) !=
 861                         ACPI_TYPE_PACKAGE)) {
 862                         status =
 863                             walk_callback(ACPI_COPY_TYPE_SIMPLE,
 864                                           this_source_obj, state, context);
 865                         if (ACPI_FAILURE(status)) {
 866                                 return_ACPI_STATUS(status);
 867                         }
 868
 869                         state->pkg.index++;
 870                         while (state->pkg.index >=
 871                                state->pkg.source_object->package.count) {
 872                                 /*
 873                                  * We've handled all of the objects at this level,  This means
 874                                  * that we have just completed a package.  That package may
 875                                  * have contained one or more packages itself.
 876                                  *
 877                                  * Delete this state and pop the previous state (package).
 878                                  */
 879                                 acpi_ut_delete_generic_state(state);
 880                                 state = acpi_ut_pop_generic_state(&state_list);
 881
 882                                 /* Finished when there are no more states */
 883
 884                                 if (!state) {
 885                                         /*
 886                                          * We have handled all of the objects in the top level
 887                                          * package just add the length of the package objects
 888                                          * and exit
 889                                          */
 890                                         return_ACPI_STATUS(AE_OK);
 891                                 }
 892
 893                                 /*
 894                                  * Go back up a level and move the index past the just
 895                                  * completed package object.
 896                                  */
 897                                 state->pkg.index++;
 898                         }
 899                 } else {
 900                         /* This is a subobject of type package */
 901
 902                         status =
 903                             walk_callback(ACPI_COPY_TYPE_PACKAGE,
 904                                           this_source_obj, state, context);
 905                         if (ACPI_FAILURE(status)) {
 906                                 return_ACPI_STATUS(status);
 907                         }
 908
 909                         /*
 910                          * Push the current state and create a new one
 911                          * The callback above returned a new target package object.
 912                          */
 913                         acpi_ut_push_generic_state(&state_list, state);
 914                         state = acpi_ut_create_pkg_state(this_source_obj,
 915                                                          state->pkg.
 916                                                          this_target_obj, 0);
 917                         if (!state) {
 918                                 return_ACPI_STATUS(AE_NO_MEMORY);
 919                         }
 920                 }
 921         }
 922
 923         /* We should never get here */
 924
 925         return_ACPI_STATUS(AE_AML_INTERNAL);
 926 }
 927
 928 /*******************************************************************************
 929  *
 930  * FUNCTION:    acpi_ut_error, acpi_ut_warning, acpi_ut_info
 931  *
 932  * PARAMETERS:  module_name         - Caller's module name (for error output)
 933  *              line_number         - Caller's line number (for error output)
 934  *              Format              - Printf format string + additional args
 935  *
 936  * RETURN:      None
 937  *
 938  * DESCRIPTION: Print message with module/line/version info
 939  *
 940  ******************************************************************************/
 941
 942 void ACPI_INTERNAL_VAR_XFACE
 943 acpi_ut_error(char *module_name, u32 line_number, char *format, ...)
 944 {
 945         va_list args;
 946
 947         acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
 948
 949         va_start(args, format);
 950         acpi_os_vprintf(format, args);
 951         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 952 }
 953
 954 void ACPI_INTERNAL_VAR_XFACE
 955 acpi_ut_exception(char *module_name,
 956                   u32 line_number, acpi_status status, char *format, ...)
 957 {
 958         va_list args;
 959
 960         acpi_os_printf("ACPI Exception (%s-%04d): %s, ", module_name,
 961                        line_number, acpi_format_exception(status));
 962
 963         va_start(args, format);
 964         acpi_os_vprintf(format, args);
 965         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 966 }
 967 EXPORT_SYMBOL(acpi_ut_exception);
 968
 969 void ACPI_INTERNAL_VAR_XFACE
 970 acpi_ut_warning(char *module_name, u32 line_number, char *format, ...)
 971 {
 972         va_list args;
 973
 974         acpi_os_printf("ACPI Warning (%s-%04d): ", module_name, line_number);
 975
 976         va_start(args, format);
 977         acpi_os_vprintf(format, args);
 978         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 979 }
 980
 981 void ACPI_INTERNAL_VAR_XFACE
 982 acpi_ut_info(char *module_name, u32 line_number, char *format, ...)
 983 {
 984         va_list args;
 985
 986         acpi_os_printf("ACPI (%s-%04d): ", module_name, line_number);
 987
 988         va_start(args, format);
 989         acpi_os_vprintf(format, args);
 990         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 991 }