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 <acpi/acpi.h>
  45 #include <acpi/acnamesp.h>
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utmisc")
  49
  50 /*******************************************************************************
  51  *
  52  * FUNCTION:    acpi_ut_is_aml_table
  53  *
  54  * PARAMETERS:  Table               - An ACPI table
  55  *
  56  * RETURN:      TRUE if table contains executable AML; FALSE otherwise
  57  *
  58  * DESCRIPTION: Check ACPI Signature for a table that contains AML code.
  59  *              Currently, these are DSDT,SSDT,PSDT. All other table types are
  60  *              data tables that do not contain AML code.
  61  *
  62  ******************************************************************************/
  63 u8 acpi_ut_is_aml_table(struct acpi_table_header *table)
  64 {
  65
  66         /* Ignore tables that contain AML */
  67
  68         if (ACPI_COMPARE_NAME(table->signature, DSDT_SIG) ||
  69             ACPI_COMPARE_NAME(table->signature, PSDT_SIG) ||
  70             ACPI_COMPARE_NAME(table->signature, SSDT_SIG)) {
  71                 return (TRUE);
  72         }
  73
  74         return (FALSE);
  75 }
  76
  77 /*******************************************************************************
  78  *
  79  * FUNCTION:    acpi_ut_allocate_owner_id
  80  *
  81  * PARAMETERS:  owner_id        - Where the new owner ID is returned
  82  *
  83  * RETURN:      Status
  84  *
  85  * DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
  86  *              track objects created by the table or method, to be deleted
  87  *              when the method exits or the table is unloaded.
  88  *
  89  ******************************************************************************/
  90
  91 acpi_status acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)
  92 {
  93         acpi_native_uint i;
  94         acpi_native_uint j;
  95         acpi_native_uint k;
  96         acpi_status status;
  97
  98         ACPI_FUNCTION_TRACE(ut_allocate_owner_id);
  99
 100         /* Guard against multiple allocations of ID to the same location */
 101
 102         if (*owner_id) {
 103                 ACPI_ERROR((AE_INFO, "Owner ID [%2.2X] already exists",
 104                             *owner_id));
 105                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 106         }
 107
 108         /* Mutex for the global ID mask */
 109
 110         status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
 111         if (ACPI_FAILURE(status)) {
 112                 return_ACPI_STATUS(status);
 113         }
 114
 115         /*
 116          * Find a free owner ID, cycle through all possible IDs on repeated
 117          * allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index may have
 118          * to be scanned twice.
 119          */
 120         for (i = 0, j = acpi_gbl_last_owner_id_index;
 121              i < (ACPI_NUM_OWNERID_MASKS + 1); i++, j++) {
 122                 if (j >= ACPI_NUM_OWNERID_MASKS) {
 123                         j = 0;  /* Wraparound to start of mask array */
 124                 }
 125
 126                 for (k = acpi_gbl_next_owner_id_offset; k < 32; k++) {
 127                         if (acpi_gbl_owner_id_mask[j] == ACPI_UINT32_MAX) {
 128
 129                                 /* There are no free IDs in this mask */
 130
 131                                 break;
 132                         }
 133
 134                         if (!(acpi_gbl_owner_id_mask[j] & (1 << k))) {
 135                                 /*
 136                                  * Found a free ID. The actual ID is the bit index plus one,
 137                                  * making zero an invalid Owner ID. Save this as the last ID
 138                                  * allocated and update the global ID mask.
 139                                  */
 140                                 acpi_gbl_owner_id_mask[j] |= (1 << k);
 141
 142                                 acpi_gbl_last_owner_id_index = (u8) j;
 143                                 acpi_gbl_next_owner_id_offset = (u8) (k + 1);
 144
 145                                 /*
 146                                  * Construct encoded ID from the index and bit position
 147                                  *
 148                                  * Note: Last [j].k (bit 255) is never used and is marked
 149                                  * permanently allocated (prevents +1 overflow)
 150                                  */
 151                                 *owner_id =
 152                                     (acpi_owner_id) ((k + 1) + ACPI_MUL_32(j));
 153
 154                                 ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
 155                                                   "Allocated OwnerId: %2.2X\n",
 156                                                   (unsigned int)*owner_id));
 157                                 goto exit;
 158                         }
 159                 }
 160
 161                 acpi_gbl_next_owner_id_offset = 0;
 162         }
 163
 164         /*
 165          * All owner_ids have been allocated. This typically should
 166          * not happen since the IDs are reused after deallocation. The IDs are
 167          * allocated upon table load (one per table) and method execution, and
 168          * they are released when a table is unloaded or a method completes
 169          * execution.
 170          *
 171          * If this error happens, there may be very deep nesting of invoked control
 172          * methods, or there may be a bug where the IDs are not released.
 173          */
 174         status = AE_OWNER_ID_LIMIT;
 175         ACPI_ERROR((AE_INFO,
 176                     "Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT"));
 177
 178       exit:
 179         (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
 180         return_ACPI_STATUS(status);
 181 }
 182
 183 /*******************************************************************************
 184  *
 185  * FUNCTION:    acpi_ut_release_owner_id
 186  *
 187  * PARAMETERS:  owner_id_ptr        - Pointer to a previously allocated owner_iD
 188  *
 189  * RETURN:      None. No error is returned because we are either exiting a
 190  *              control method or unloading a table. Either way, we would
 191  *              ignore any error anyway.
 192  *
 193  * DESCRIPTION: Release a table or method owner ID.  Valid IDs are 1 - 255
 194  *
 195  ******************************************************************************/
 196
 197 void acpi_ut_release_owner_id(acpi_owner_id * owner_id_ptr)
 198 {
 199         acpi_owner_id owner_id = *owner_id_ptr;
 200         acpi_status status;
 201         acpi_native_uint index;
 202         u32 bit;
 203
 204         ACPI_FUNCTION_TRACE_U32(ut_release_owner_id, owner_id);
 205
 206         /* Always clear the input owner_id (zero is an invalid ID) */
 207
 208         *owner_id_ptr = 0;
 209
 210         /* Zero is not a valid owner_iD */
 211
 212         if (owner_id == 0) {
 213                 ACPI_ERROR((AE_INFO, "Invalid OwnerId: %2.2X", owner_id));
 214                 return_VOID;
 215         }
 216
 217         /* Mutex for the global ID mask */
 218
 219         status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
 220         if (ACPI_FAILURE(status)) {
 221                 return_VOID;
 222         }
 223
 224         /* Normalize the ID to zero */
 225
 226         owner_id--;
 227
 228         /* Decode ID to index/offset pair */
 229
 230         index = ACPI_DIV_32(owner_id);
 231         bit = 1 << ACPI_MOD_32(owner_id);
 232
 233         /* Free the owner ID only if it is valid */
 234
 235         if (acpi_gbl_owner_id_mask[index] & bit) {
 236                 acpi_gbl_owner_id_mask[index] ^= bit;
 237         } else {
 238                 ACPI_ERROR((AE_INFO,
 239                             "Release of non-allocated OwnerId: %2.2X",
 240                             owner_id + 1));
 241         }
 242
 243         (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
 244         return_VOID;
 245 }
 246
 247 /*******************************************************************************
 248  *
 249  * FUNCTION:    acpi_ut_strupr (strupr)
 250  *
 251  * PARAMETERS:  src_string      - The source string to convert
 252  *
 253  * RETURN:      None
 254  *
 255  * DESCRIPTION: Convert string to uppercase
 256  *
 257  * NOTE: This is not a POSIX function, so it appears here, not in utclib.c
 258  *
 259  ******************************************************************************/
 260
 261 void acpi_ut_strupr(char *src_string)
 262 {
 263         char *string;
 264
 265         ACPI_FUNCTION_ENTRY();
 266
 267         if (!src_string) {
 268                 return;
 269         }
 270
 271         /* Walk entire string, uppercasing the letters */
 272
 273         for (string = src_string; *string; string++) {
 274                 *string = (char)ACPI_TOUPPER(*string);
 275         }
 276
 277         return;
 278 }
 279
 280 /*******************************************************************************
 281  *
 282  * FUNCTION:    acpi_ut_print_string
 283  *
 284  * PARAMETERS:  String          - Null terminated ASCII string
 285  *              max_length      - Maximum output length
 286  *
 287  * RETURN:      None
 288  *
 289  * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
 290  *              sequences.
 291  *
 292  ******************************************************************************/
 293
 294 void acpi_ut_print_string(char *string, u8 max_length)
 295 {
 296         u32 i;
 297
 298         if (!string) {
 299                 acpi_os_printf("<\"NULL STRING PTR\">");
 300                 return;
 301         }
 302
 303         acpi_os_printf("\"");
 304         for (i = 0; string[i] && (i < max_length); i++) {
 305
 306                 /* Escape sequences */
 307
 308                 switch (string[i]) {
 309                 case 0x07:
 310                         acpi_os_printf("\\a");  /* BELL */
 311                         break;
 312
 313                 case 0x08:
 314                         acpi_os_printf("\\b");  /* BACKSPACE */
 315                         break;
 316
 317                 case 0x0C:
 318                         acpi_os_printf("\\f");  /* FORMFEED */
 319                         break;
 320
 321                 case 0x0A:
 322                         acpi_os_printf("\\n");  /* LINEFEED */
 323                         break;
 324
 325                 case 0x0D:
 326                         acpi_os_printf("\\r");  /* CARRIAGE RETURN */
 327                         break;
 328
 329                 case 0x09:
 330                         acpi_os_printf("\\t");  /* HORIZONTAL TAB */
 331                         break;
 332
 333                 case 0x0B:
 334                         acpi_os_printf("\\v");  /* VERTICAL TAB */
 335                         break;
 336
 337                 case '\'':      /* Single Quote */
 338                 case '\"':      /* Double Quote */
 339                 case '\\':      /* Backslash */
 340                         acpi_os_printf("\\%c", (int)string[i]);
 341                         break;
 342
 343                 default:
 344
 345                         /* Check for printable character or hex escape */
 346
 347                         if (ACPI_IS_PRINT(string[i])) {
 348                                 /* This is a normal character */
 349
 350                                 acpi_os_printf("%c", (int)string[i]);
 351                         } else {
 352                                 /* All others will be Hex escapes */
 353
 354                                 acpi_os_printf("\\x%2.2X", (s32) string[i]);
 355                         }
 356                         break;
 357                 }
 358         }
 359         acpi_os_printf("\"");
 360
 361         if (i == max_length && string[i]) {
 362                 acpi_os_printf("...");
 363         }
 364 }
 365
 366 /*******************************************************************************
 367  *
 368  * FUNCTION:    acpi_ut_dword_byte_swap
 369  *
 370  * PARAMETERS:  Value           - Value to be converted
 371  *
 372  * RETURN:      u32 integer with bytes swapped
 373  *
 374  * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
 375  *
 376  ******************************************************************************/
 377
 378 u32 acpi_ut_dword_byte_swap(u32 value)
 379 {
 380         union {
 381                 u32 value;
 382                 u8 bytes[4];
 383         } out;
 384         union {
 385                 u32 value;
 386                 u8 bytes[4];
 387         } in;
 388
 389         ACPI_FUNCTION_ENTRY();
 390
 391         in.value = value;
 392
 393         out.bytes[0] = in.bytes[3];
 394         out.bytes[1] = in.bytes[2];
 395         out.bytes[2] = in.bytes[1];
 396         out.bytes[3] = in.bytes[0];
 397
 398         return (out.value);
 399 }
 400
 401 /*******************************************************************************
 402  *
 403  * FUNCTION:    acpi_ut_set_integer_width
 404  *
 405  * PARAMETERS:  Revision            From DSDT header
 406  *
 407  * RETURN:      None
 408  *
 409  * DESCRIPTION: Set the global integer bit width based upon the revision
 410  *              of the DSDT.  For Revision 1 and 0, Integers are 32 bits.
 411  *              For Revision 2 and above, Integers are 64 bits.  Yes, this
 412  *              makes a difference.
 413  *
 414  ******************************************************************************/
 415
 416 void acpi_ut_set_integer_width(u8 revision)
 417 {
 418
 419         if (revision <= 1) {
 420                 acpi_gbl_integer_bit_width = 32;
 421                 acpi_gbl_integer_nybble_width = 8;
 422                 acpi_gbl_integer_byte_width = 4;
 423         } else {
 424                 acpi_gbl_integer_bit_width = 64;
 425                 acpi_gbl_integer_nybble_width = 16;
 426                 acpi_gbl_integer_byte_width = 8;
 427         }
 428 }
 429
 430 #ifdef ACPI_DEBUG_OUTPUT
 431 /*******************************************************************************
 432  *
 433  * FUNCTION:    acpi_ut_display_init_pathname
 434  *
 435  * PARAMETERS:  Type                - Object type of the node
 436  *              obj_handle          - Handle whose pathname will be displayed
 437  *              Path                - Additional path string to be appended.
 438  *                                      (NULL if no extra path)
 439  *
 440  * RETURN:      acpi_status
 441  *
 442  * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
 443  *
 444  ******************************************************************************/
 445
 446 void
 447 acpi_ut_display_init_pathname(u8 type,
 448                               struct acpi_namespace_node *obj_handle,
 449                               char *path)
 450 {
 451         acpi_status status;
 452         struct acpi_buffer buffer;
 453
 454         ACPI_FUNCTION_ENTRY();
 455
 456         /* Only print the path if the appropriate debug level is enabled */
 457
 458         if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
 459                 return;
 460         }
 461
 462         /* Get the full pathname to the node */
 463
 464         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 465         status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
 466         if (ACPI_FAILURE(status)) {
 467                 return;
 468         }
 469
 470         /* Print what we're doing */
 471
 472         switch (type) {
 473         case ACPI_TYPE_METHOD:
 474                 acpi_os_printf("Executing  ");
 475                 break;
 476
 477         default:
 478                 acpi_os_printf("Initializing ");
 479                 break;
 480         }
 481
 482         /* Print the object type and pathname */
 483
 484         acpi_os_printf("%-12s %s",
 485                        acpi_ut_get_type_name(type), (char *)buffer.pointer);
 486
 487         /* Extra path is used to append names like _STA, _INI, etc. */
 488
 489         if (path) {
 490                 acpi_os_printf(".%s", path);
 491         }
 492         acpi_os_printf("\n");
 493
 494         ACPI_FREE(buffer.pointer);
 495 }
 496 #endif
 497
 498 /*******************************************************************************
 499  *
 500  * FUNCTION:    acpi_ut_valid_acpi_char
 501  *
 502  * PARAMETERS:  Char            - The character to be examined
 503  *
 504  * RETURN:      TRUE if the character is valid, FALSE otherwise
 505  *
 506  * DESCRIPTION: Check for a valid ACPI character. Must be one of:
 507  *              1) Upper case alpha
 508  *              2) numeric
 509  *              3) underscore
 510  *
 511  *              We allow a '!' as the last character because of the ASF! table
 512  *
 513  ******************************************************************************/
 514
 515 u8 acpi_ut_valid_acpi_char(char character, acpi_native_uint position)
 516 {
 517
 518         if (!((character >= 'A' && character <= 'Z') ||
 519               (character >= '0' && character <= '9') || (character == '_'))) {
 520
 521                 /* Allow a '!' in the last position */
 522
 523                 if (character == '!' && position == 3) {
 524                         return (TRUE);
 525                 }
 526
 527                 return (FALSE);
 528         }
 529
 530         return (TRUE);
 531 }
 532
 533 /*******************************************************************************
 534  *
 535  * FUNCTION:    acpi_ut_valid_acpi_name
 536  *
 537  * PARAMETERS:  Name            - The name to be examined
 538  *
 539  * RETURN:      TRUE if the name is valid, FALSE otherwise
 540  *
 541  * DESCRIPTION: Check for a valid ACPI name.  Each character must be one of:
 542  *              1) Upper case alpha
 543  *              2) numeric
 544  *              3) underscore
 545  *
 546  ******************************************************************************/
 547
 548 u8 acpi_ut_valid_acpi_name(u32 name)
 549 {
 550         acpi_native_uint i;
 551
 552         ACPI_FUNCTION_ENTRY();
 553
 554         for (i = 0; i < ACPI_NAME_SIZE; i++) {
 555                 if (!acpi_ut_valid_acpi_char
 556                     ((ACPI_CAST_PTR(char, &name))[i], i)) {
 557                         return (FALSE);
 558                 }
 559         }
 560
 561         return (TRUE);
 562 }
 563
 564 /*******************************************************************************
 565  *
 566  * FUNCTION:    acpi_ut_repair_name
 567  *
 568  * PARAMETERS:  Name            - The ACPI name to be repaired
 569  *
 570  * RETURN:      Repaired version of the name
 571  *
 572  * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
 573  *              return the new name.
 574  *
 575  ******************************************************************************/
 576
 577 acpi_name acpi_ut_repair_name(acpi_name name)
 578 {
 579         char *name_ptr = ACPI_CAST_PTR(char, &name);
 580         char new_name[ACPI_NAME_SIZE];
 581         acpi_native_uint i;
 582
 583         for (i = 0; i < ACPI_NAME_SIZE; i++) {
 584                 new_name[i] = name_ptr[i];
 585
 586                 /*
 587                  * Replace a bad character with something printable, yet technically
 588                  * still invalid. This prevents any collisions with existing "good"
 589                  * names in the namespace.
 590                  */
 591                 if (!acpi_ut_valid_acpi_char(name_ptr[i], i)) {
 592                         new_name[i] = '*';
 593                 }
 594         }
 595
 596         return (*ACPI_CAST_PTR(u32, new_name));
 597 }
 598
 599 /*******************************************************************************
 600  *
 601  * FUNCTION:    acpi_ut_strtoul64
 602  *
 603  * PARAMETERS:  String          - Null terminated string
 604  *              Base            - Radix of the string: 16 or ACPI_ANY_BASE;
 605  *                                ACPI_ANY_BASE means 'in behalf of to_integer'
 606  *              ret_integer     - Where the converted integer is returned
 607  *
 608  * RETURN:      Status and Converted value
 609  *
 610  * DESCRIPTION: Convert a string into an unsigned value.
 611  *              NOTE: Does not support Octal strings, not needed.
 612  *
 613  ******************************************************************************/
 614
 615 acpi_status
 616 acpi_ut_strtoul64(char *string, u32 base, acpi_integer * ret_integer)
 617 {
 618         u32 this_digit = 0;
 619         acpi_integer return_value = 0;
 620         acpi_integer quotient;
 621         acpi_integer dividend;
 622         u32 to_integer_op = (base == ACPI_ANY_BASE);
 623         u32 mode32 = (acpi_gbl_integer_byte_width == 4);
 624         u8 valid_digits = 0;
 625         u8 sign_of0x = 0;
 626         u8 term = 0;
 627
 628         ACPI_FUNCTION_TRACE(ut_stroul64);
 629
 630         switch (base) {
 631         case ACPI_ANY_BASE:
 632         case 16:
 633                 break;
 634
 635         default:
 636                 /* Invalid Base */
 637                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 638         }
 639
 640         if (!string) {
 641                 goto error_exit;
 642         }
 643
 644         /* Skip over any white space in the buffer */
 645
 646         while ((*string) && (ACPI_IS_SPACE(*string) || *string == '\t')) {
 647                 string++;
 648         }
 649
 650         if (to_integer_op) {
 651                 /*
 652                  * Base equal to ACPI_ANY_BASE means 'to_integer operation case'.
 653                  * We need to determine if it is decimal or hexadecimal.
 654                  */
 655                 if ((*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
 656                         sign_of0x = 1;
 657                         base = 16;
 658
 659                         /* Skip over the leading '0x' */
 660                         string += 2;
 661                 } else {
 662                         base = 10;
 663                 }
 664         }
 665
 666         /* Any string left? Check that '0x' is not followed by white space. */
 667
 668         if (!(*string) || ACPI_IS_SPACE(*string) || *string == '\t') {
 669                 if (to_integer_op) {
 670                         goto error_exit;
 671                 } else {
 672                         goto all_done;
 673                 }
 674         }
 675
 676         dividend = (mode32) ? ACPI_UINT32_MAX : ACPI_UINT64_MAX;
 677
 678         /* At least one character in the string here */
 679
 680         /* Main loop: convert the string to a 64-bit integer */
 681
 682         while (*string) {
 683                 if (ACPI_IS_DIGIT(*string)) {
 684
 685                         /* Convert ASCII 0-9 to Decimal value */
 686
 687                         this_digit = ((u8) * string) - '0';
 688                 } else if (base == 10) {
 689
 690                         /* Digit is out of range; possible in to_integer case only */
 691
 692                         term = 1;
 693                 } else {
 694                         this_digit = (u8) ACPI_TOUPPER(*string);
 695                         if (ACPI_IS_XDIGIT((char)this_digit)) {
 696
 697                                 /* Convert ASCII Hex char to value */
 698
 699                                 this_digit = this_digit - 'A' + 10;
 700                         } else {
 701                                 term = 1;
 702                         }
 703                 }
 704
 705                 if (term) {
 706                         if (to_integer_op) {
 707                                 goto error_exit;
 708                         } else {
 709                                 break;
 710                         }
 711                 } else if ((valid_digits == 0) && (this_digit == 0)
 712                            && !sign_of0x) {
 713
 714                         /* Skip zeros */
 715                         string++;
 716                         continue;
 717                 }
 718
 719                 valid_digits++;
 720
 721                 if (sign_of0x
 722                     && ((valid_digits > 16)
 723                         || ((valid_digits > 8) && mode32))) {
 724                         /*
 725                          * This is to_integer operation case.
 726                          * No any restrictions for string-to-integer conversion,
 727                          * see ACPI spec.
 728                          */
 729                         goto error_exit;
 730                 }
 731
 732                 /* Divide the digit into the correct position */
 733
 734                 (void)
 735                     acpi_ut_short_divide((dividend - (acpi_integer) this_digit),
 736                                          base, &quotient, NULL);
 737
 738                 if (return_value > quotient) {
 739                         if (to_integer_op) {
 740                                 goto error_exit;
 741                         } else {
 742                                 break;
 743                         }
 744                 }
 745
 746                 return_value *= base;
 747                 return_value += this_digit;
 748                 string++;
 749         }
 750
 751         /* All done, normal exit */
 752
 753       all_done:
 754
 755         *ret_integer = return_value;
 756         return_ACPI_STATUS(AE_OK);
 757
 758       error_exit:
 759         /* Base was set/validated above */
 760
 761         if (base == 10) {
 762                 return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
 763         } else {
 764                 return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
 765         }
 766 }
 767
 768 /*******************************************************************************
 769  *
 770  * FUNCTION:    acpi_ut_create_update_state_and_push
 771  *
 772  * PARAMETERS:  Object          - Object to be added to the new state
 773  *              Action          - Increment/Decrement
 774  *              state_list      - List the state will be added to
 775  *
 776  * RETURN:      Status
 777  *
 778  * DESCRIPTION: Create a new state and push it
 779  *
 780  ******************************************************************************/
 781
 782 acpi_status
 783 acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
 784                                      u16 action,
 785                                      union acpi_generic_state **state_list)
 786 {
 787         union acpi_generic_state *state;
 788
 789         ACPI_FUNCTION_ENTRY();
 790
 791         /* Ignore null objects; these are expected */
 792
 793         if (!object) {
 794                 return (AE_OK);
 795         }
 796
 797         state = acpi_ut_create_update_state(object, action);
 798         if (!state) {
 799                 return (AE_NO_MEMORY);
 800         }
 801
 802         acpi_ut_push_generic_state(state_list, state);
 803         return (AE_OK);
 804 }
 805
 806 /*******************************************************************************
 807  *
 808  * FUNCTION:    acpi_ut_walk_package_tree
 809  *
 810  * PARAMETERS:  source_object       - The package to walk
 811  *              target_object       - Target object (if package is being copied)
 812  *              walk_callback       - Called once for each package element
 813  *              Context             - Passed to the callback function
 814  *
 815  * RETURN:      Status
 816  *
 817  * DESCRIPTION: Walk through a package
 818  *
 819  ******************************************************************************/
 820
 821 acpi_status
 822 acpi_ut_walk_package_tree(union acpi_operand_object * source_object,
 823                           void *target_object,
 824                           acpi_pkg_callback walk_callback, void *context)
 825 {
 826         acpi_status status = AE_OK;
 827         union acpi_generic_state *state_list = NULL;
 828         union acpi_generic_state *state;
 829         u32 this_index;
 830         union acpi_operand_object *this_source_obj;
 831
 832         ACPI_FUNCTION_TRACE(ut_walk_package_tree);
 833
 834         state = acpi_ut_create_pkg_state(source_object, target_object, 0);
 835         if (!state) {
 836                 return_ACPI_STATUS(AE_NO_MEMORY);
 837         }
 838
 839         while (state) {
 840
 841                 /* Get one element of the package */
 842
 843                 this_index = state->pkg.index;
 844                 this_source_obj = (union acpi_operand_object *)
 845                     state->pkg.source_object->package.elements[this_index];
 846
 847                 /*
 848                  * Check for:
 849                  * 1) An uninitialized package element.  It is completely
 850                  *    legal to declare a package and leave it uninitialized
 851                  * 2) Not an internal object - can be a namespace node instead
 852                  * 3) Any type other than a package.  Packages are handled in else
 853                  *    case below.
 854                  */
 855                 if ((!this_source_obj) ||
 856                     (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
 857                      ACPI_DESC_TYPE_OPERAND)
 858                     || (ACPI_GET_OBJECT_TYPE(this_source_obj) !=
 859                         ACPI_TYPE_PACKAGE)) {
 860                         status =
 861                             walk_callback(ACPI_COPY_TYPE_SIMPLE,
 862                                           this_source_obj, state, context);
 863                         if (ACPI_FAILURE(status)) {
 864                                 return_ACPI_STATUS(status);
 865                         }
 866
 867                         state->pkg.index++;
 868                         while (state->pkg.index >=
 869                                state->pkg.source_object->package.count) {
 870                                 /*
 871                                  * We've handled all of the objects at this level,  This means
 872                                  * that we have just completed a package.  That package may
 873                                  * have contained one or more packages itself.
 874                                  *
 875                                  * Delete this state and pop the previous state (package).
 876                                  */
 877                                 acpi_ut_delete_generic_state(state);
 878                                 state = acpi_ut_pop_generic_state(&state_list);
 879
 880                                 /* Finished when there are no more states */
 881
 882                                 if (!state) {
 883                                         /*
 884                                          * We have handled all of the objects in the top level
 885                                          * package just add the length of the package objects
 886                                          * and exit
 887                                          */
 888                                         return_ACPI_STATUS(AE_OK);
 889                                 }
 890
 891                                 /*
 892                                  * Go back up a level and move the index past the just
 893                                  * completed package object.
 894                                  */
 895                                 state->pkg.index++;
 896                         }
 897                 } else {
 898                         /* This is a subobject of type package */
 899
 900                         status =
 901                             walk_callback(ACPI_COPY_TYPE_PACKAGE,
 902                                           this_source_obj, state, context);
 903                         if (ACPI_FAILURE(status)) {
 904                                 return_ACPI_STATUS(status);
 905                         }
 906
 907                         /*
 908                          * Push the current state and create a new one
 909                          * The callback above returned a new target package object.
 910                          */
 911                         acpi_ut_push_generic_state(&state_list, state);
 912                         state = acpi_ut_create_pkg_state(this_source_obj,
 913                                                          state->pkg.
 914                                                          this_target_obj, 0);
 915                         if (!state) {
 916                                 return_ACPI_STATUS(AE_NO_MEMORY);
 917                         }
 918                 }
 919         }
 920
 921         /* We should never get here */
 922
 923         return_ACPI_STATUS(AE_AML_INTERNAL);
 924 }
 925
 926 /*******************************************************************************
 927  *
 928  * FUNCTION:    acpi_ut_error, acpi_ut_warning, acpi_ut_info
 929  *
 930  * PARAMETERS:  module_name         - Caller's module name (for error output)
 931  *              line_number         - Caller's line number (for error output)
 932  *              Format              - Printf format string + additional args
 933  *
 934  * RETURN:      None
 935  *
 936  * DESCRIPTION: Print message with module/line/version info
 937  *
 938  ******************************************************************************/
 939
 940 void ACPI_INTERNAL_VAR_XFACE
 941 acpi_ut_error(char *module_name, u32 line_number, char *format, ...)
 942 {
 943         va_list args;
 944
 945         acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);
 946
 947         va_start(args, format);
 948         acpi_os_vprintf(format, args);
 949         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 950 }
 951
 952 void ACPI_INTERNAL_VAR_XFACE
 953 acpi_ut_exception(char *module_name,
 954                   u32 line_number, acpi_status status, char *format, ...)
 955 {
 956         va_list args;
 957
 958         acpi_os_printf("ACPI Exception (%s-%04d): %s, ", module_name,
 959                        line_number, acpi_format_exception(status));
 960
 961         va_start(args, format);
 962         acpi_os_vprintf(format, args);
 963         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 964 }
 965
 966 void ACPI_INTERNAL_VAR_XFACE
 967 acpi_ut_warning(char *module_name, u32 line_number, char *format, ...)
 968 {
 969         va_list args;
 970
 971         acpi_os_printf("ACPI Warning (%s-%04d): ", module_name, line_number);
 972
 973         va_start(args, format);
 974         acpi_os_vprintf(format, args);
 975         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 976 }
 977
 978 void ACPI_INTERNAL_VAR_XFACE
 979 acpi_ut_info(char *module_name, u32 line_number, char *format, ...)
 980 {
 981         va_list args;
 982
 983         acpi_os_printf("ACPI (%s-%04d): ", module_name, line_number);
 984
 985         va_start(args, format);
 986         acpi_os_vprintf(format, args);
 987         acpi_os_printf(" [%X]\n", ACPI_CA_VERSION);
 988 }