drivers/acpi/acpica/exconvrt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exconvrt - Object conversion routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acinterp.h"
  47 #include "amlcode.h"
  48
  49 #define _COMPONENT          ACPI_EXECUTER
  50 ACPI_MODULE_NAME("exconvrt")
  51
  52 /* Local prototypes */
  53 static u32
  54 acpi_ex_convert_to_ascii(u64 integer, u16 base, u8 *string, u8 max_length);
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_ex_convert_to_integer
  59  *
  60  * PARAMETERS:  obj_desc            - Object to be converted. Must be an
  61  *                                    Integer, Buffer, or String
  62  *              result_desc         - Where the new Integer object is returned
  63  *              implicit_conversion - Used for string conversion
  64  *
  65  * RETURN:      Status
  66  *
  67  * DESCRIPTION: Convert an ACPI Object to an integer.
  68  *
  69  ******************************************************************************/
  70
  71 acpi_status
  72 acpi_ex_convert_to_integer(union acpi_operand_object *obj_desc,
  73                            union acpi_operand_object **result_desc,
  74                            u32 implicit_conversion)
  75 {
  76         union acpi_operand_object *return_desc;
  77         u8 *pointer;
  78         u64 result;
  79         u32 i;
  80         u32 count;
  81
  82         ACPI_FUNCTION_TRACE_PTR(ex_convert_to_integer, obj_desc);
  83
  84         switch (obj_desc->common.type) {
  85         case ACPI_TYPE_INTEGER:
  86
  87                 /* No conversion necessary */
  88
  89                 *result_desc = obj_desc;
  90                 return_ACPI_STATUS(AE_OK);
  91
  92         case ACPI_TYPE_BUFFER:
  93         case ACPI_TYPE_STRING:
  94
  95                 /* Note: Takes advantage of common buffer/string fields */
  96
  97                 pointer = obj_desc->buffer.pointer;
  98                 count = obj_desc->buffer.length;
  99                 break;
 100
 101         default:
 102
 103                 return_ACPI_STATUS(AE_TYPE);
 104         }
 105
 106         /*
 107          * Convert the buffer/string to an integer. Note that both buffers and
 108          * strings are treated as raw data - we don't convert ascii to hex for
 109          * strings.
 110          *
 111          * There are two terminating conditions for the loop:
 112          * 1) The size of an integer has been reached, or
 113          * 2) The end of the buffer or string has been reached
 114          */
 115         result = 0;
 116
 117         /* String conversion is different than Buffer conversion */
 118
 119         switch (obj_desc->common.type) {
 120         case ACPI_TYPE_STRING:
 121                 /*
 122                  * Convert string to an integer - for most cases, the string must be
 123                  * hexadecimal as per the ACPI specification. The only exception (as
 124                  * of ACPI 3.0) is that the to_integer() operator allows both decimal
 125                  * and hexadecimal strings (hex prefixed with "0x").
 126                  *
 127                  * Explicit conversion is used only by to_integer.
 128                  * All other string-to-integer conversions are implicit conversions.
 129                  */
 130                 if (implicit_conversion) {
 131                         result =
 132                             acpi_ut_implicit_strtoul64(ACPI_CAST_PTR
 133                                                        (char, pointer));
 134                 } else {
 135                         result =
 136                             acpi_ut_explicit_strtoul64(ACPI_CAST_PTR
 137                                                        (char, pointer));
 138                 }
 139                 break;
 140
 141         case ACPI_TYPE_BUFFER:
 142
 143                 /* Check for zero-length buffer */
 144
 145                 if (!count) {
 146                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 147                 }
 148
 149                 /* Transfer no more than an integer's worth of data */
 150
 151                 if (count > acpi_gbl_integer_byte_width) {
 152                         count = acpi_gbl_integer_byte_width;
 153                 }
 154
 155                 /*
 156                  * Convert buffer to an integer - we simply grab enough raw data
 157                  * from the buffer to fill an integer
 158                  */
 159                 for (i = 0; i < count; i++) {
 160                         /*
 161                          * Get next byte and shift it into the Result.
 162                          * Little endian is used, meaning that the first byte of the buffer
 163                          * is the LSB of the integer
 164                          */
 165                         result |= (((u64) pointer[i]) << (i * 8));
 166                 }
 167                 break;
 168
 169         default:
 170
 171                 /* No other types can get here */
 172
 173                 break;
 174         }
 175
 176         /* Create a new integer */
 177
 178         return_desc = acpi_ut_create_integer_object(result);
 179         if (!return_desc) {
 180                 return_ACPI_STATUS(AE_NO_MEMORY);
 181         }
 182
 183         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
 184                           ACPI_FORMAT_UINT64(result)));
 185
 186         /* Save the Result */
 187
 188         (void)acpi_ex_truncate_for32bit_table(return_desc);
 189         *result_desc = return_desc;
 190         return_ACPI_STATUS(AE_OK);
 191 }
 192
 193 /*******************************************************************************
 194  *
 195  * FUNCTION:    acpi_ex_convert_to_buffer
 196  *
 197  * PARAMETERS:  obj_desc        - Object to be converted. Must be an
 198  *                                Integer, Buffer, or String
 199  *              result_desc     - Where the new buffer object is returned
 200  *
 201  * RETURN:      Status
 202  *
 203  * DESCRIPTION: Convert an ACPI Object to a Buffer
 204  *
 205  ******************************************************************************/
 206
 207 acpi_status
 208 acpi_ex_convert_to_buffer(union acpi_operand_object *obj_desc,
 209                           union acpi_operand_object **result_desc)
 210 {
 211         union acpi_operand_object *return_desc;
 212         u8 *new_buf;
 213
 214         ACPI_FUNCTION_TRACE_PTR(ex_convert_to_buffer, obj_desc);
 215
 216         switch (obj_desc->common.type) {
 217         case ACPI_TYPE_BUFFER:
 218
 219                 /* No conversion necessary */
 220
 221                 *result_desc = obj_desc;
 222                 return_ACPI_STATUS(AE_OK);
 223
 224         case ACPI_TYPE_INTEGER:
 225                 /*
 226                  * Create a new Buffer object.
 227                  * Need enough space for one integer
 228                  */
 229                 return_desc =
 230                     acpi_ut_create_buffer_object(acpi_gbl_integer_byte_width);
 231                 if (!return_desc) {
 232                         return_ACPI_STATUS(AE_NO_MEMORY);
 233                 }
 234
 235                 /* Copy the integer to the buffer, LSB first */
 236
 237                 new_buf = return_desc->buffer.pointer;
 238                 memcpy(new_buf, &obj_desc->integer.value,
 239                        acpi_gbl_integer_byte_width);
 240                 break;
 241
 242         case ACPI_TYPE_STRING:
 243                 /*
 244                  * Create a new Buffer object
 245                  * Size will be the string length
 246                  *
 247                  * NOTE: Add one to the string length to include the null terminator.
 248                  * The ACPI spec is unclear on this subject, but there is existing
 249                  * ASL/AML code that depends on the null being transferred to the new
 250                  * buffer.
 251                  */
 252                 return_desc = acpi_ut_create_buffer_object((acpi_size)
 253                                                            obj_desc->string.
 254                                                            length + 1);
 255                 if (!return_desc) {
 256                         return_ACPI_STATUS(AE_NO_MEMORY);
 257                 }
 258
 259                 /* Copy the string to the buffer */
 260
 261                 new_buf = return_desc->buffer.pointer;
 262                 strncpy((char *)new_buf, (char *)obj_desc->string.pointer,
 263                         obj_desc->string.length);
 264                 break;
 265
 266         default:
 267
 268                 return_ACPI_STATUS(AE_TYPE);
 269         }
 270
 271         /* Mark buffer initialized */
 272
 273         return_desc->common.flags |= AOPOBJ_DATA_VALID;
 274         *result_desc = return_desc;
 275         return_ACPI_STATUS(AE_OK);
 276 }
 277
 278 /*******************************************************************************
 279  *
 280  * FUNCTION:    acpi_ex_convert_to_ascii
 281  *
 282  * PARAMETERS:  integer         - Value to be converted
 283  *              base            - ACPI_STRING_DECIMAL or ACPI_STRING_HEX
 284  *              string          - Where the string is returned
 285  *              data_width      - Size of data item to be converted, in bytes
 286  *
 287  * RETURN:      Actual string length
 288  *
 289  * DESCRIPTION: Convert an ACPI Integer to a hex or decimal string
 290  *
 291  ******************************************************************************/
 292
 293 static u32
 294 acpi_ex_convert_to_ascii(u64 integer, u16 base, u8 *string, u8 data_width)
 295 {
 296         u64 digit;
 297         u32 i;
 298         u32 j;
 299         u32 k = 0;
 300         u32 hex_length;
 301         u32 decimal_length;
 302         u32 remainder;
 303         u8 supress_zeros;
 304
 305         ACPI_FUNCTION_ENTRY();
 306
 307         switch (base) {
 308         case 10:
 309
 310                 /* Setup max length for the decimal number */
 311
 312                 switch (data_width) {
 313                 case 1:
 314
 315                         decimal_length = ACPI_MAX8_DECIMAL_DIGITS;
 316                         break;
 317
 318                 case 4:
 319
 320                         decimal_length = ACPI_MAX32_DECIMAL_DIGITS;
 321                         break;
 322
 323                 case 8:
 324                 default:
 325
 326                         decimal_length = ACPI_MAX64_DECIMAL_DIGITS;
 327                         break;
 328                 }
 329
 330                 supress_zeros = TRUE;   /* No leading zeros */
 331                 remainder = 0;
 332
 333                 for (i = decimal_length; i > 0; i--) {
 334
 335                         /* Divide by nth factor of 10 */
 336
 337                         digit = integer;
 338                         for (j = 0; j < i; j++) {
 339                                 (void)acpi_ut_short_divide(digit, 10, &digit,
 340                                                            &remainder);
 341                         }
 342
 343                         /* Handle leading zeros */
 344
 345                         if (remainder != 0) {
 346                                 supress_zeros = FALSE;
 347                         }
 348
 349                         if (!supress_zeros) {
 350                                 string[k] = (u8) (ACPI_ASCII_ZERO + remainder);
 351                                 k++;
 352                         }
 353                 }
 354                 break;
 355
 356         case 16:
 357
 358                 /* hex_length: 2 ascii hex chars per data byte */
 359
 360                 hex_length = ACPI_MUL_2(data_width);
 361                 for (i = 0, j = (hex_length - 1); i < hex_length; i++, j--) {
 362
 363                         /* Get one hex digit, most significant digits first */
 364
 365                         string[k] = (u8)
 366                             acpi_ut_hex_to_ascii_char(integer, ACPI_MUL_4(j));
 367                         k++;
 368                 }
 369                 break;
 370
 371         default:
 372                 return (0);
 373         }
 374
 375         /*
 376          * Since leading zeros are suppressed, we must check for the case where
 377          * the integer equals 0
 378          *
 379          * Finally, null terminate the string and return the length
 380          */
 381         if (!k) {
 382                 string[0] = ACPI_ASCII_ZERO;
 383                 k = 1;
 384         }
 385
 386         string[k] = 0;
 387         return ((u32) k);
 388 }
 389
 390 /*******************************************************************************
 391  *
 392  * FUNCTION:    acpi_ex_convert_to_string
 393  *
 394  * PARAMETERS:  obj_desc        - Object to be converted. Must be an
 395  *                                Integer, Buffer, or String
 396  *              result_desc     - Where the string object is returned
 397  *              type            - String flags (base and conversion type)
 398  *
 399  * RETURN:      Status
 400  *
 401  * DESCRIPTION: Convert an ACPI Object to a string
 402  *
 403  ******************************************************************************/
 404
 405 acpi_status
 406 acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,
 407                           union acpi_operand_object ** result_desc, u32 type)
 408 {
 409         union acpi_operand_object *return_desc;
 410         u8 *new_buf;
 411         u32 i;
 412         u32 string_length = 0;
 413         u16 base = 16;
 414         u8 separator = ',';
 415
 416         ACPI_FUNCTION_TRACE_PTR(ex_convert_to_string, obj_desc);
 417
 418         switch (obj_desc->common.type) {
 419         case ACPI_TYPE_STRING:
 420
 421                 /* No conversion necessary */
 422
 423                 *result_desc = obj_desc;
 424                 return_ACPI_STATUS(AE_OK);
 425
 426         case ACPI_TYPE_INTEGER:
 427
 428                 switch (type) {
 429                 case ACPI_EXPLICIT_CONVERT_DECIMAL:
 430
 431                         /* Make room for maximum decimal number */
 432
 433                         string_length = ACPI_MAX_DECIMAL_DIGITS;
 434                         base = 10;
 435                         break;
 436
 437                 default:
 438
 439                         /* Two hex string characters for each integer byte */
 440
 441                         string_length = ACPI_MUL_2(acpi_gbl_integer_byte_width);
 442                         break;
 443                 }
 444
 445                 /*
 446                  * Create a new String
 447                  * Need enough space for one ASCII integer (plus null terminator)
 448                  */
 449                 return_desc =
 450                     acpi_ut_create_string_object((acpi_size)string_length);
 451                 if (!return_desc) {
 452                         return_ACPI_STATUS(AE_NO_MEMORY);
 453                 }
 454
 455                 new_buf = return_desc->buffer.pointer;
 456
 457                 /* Convert integer to string */
 458
 459                 string_length =
 460                     acpi_ex_convert_to_ascii(obj_desc->integer.value, base,
 461                                              new_buf,
 462                                              acpi_gbl_integer_byte_width);
 463
 464                 /* Null terminate at the correct place */
 465
 466                 return_desc->string.length = string_length;
 467                 new_buf[string_length] = 0;
 468                 break;
 469
 470         case ACPI_TYPE_BUFFER:
 471
 472                 /* Setup string length, base, and separator */
 473
 474                 switch (type) {
 475                 case ACPI_EXPLICIT_CONVERT_DECIMAL:     /* Used by to_decimal_string */
 476                         /*
 477                          * From ACPI: "If Data is a buffer, it is converted to a string of
 478                          * decimal values separated by commas."
 479                          */
 480                         base = 10;
 481
 482                         /*
 483                          * Calculate the final string length. Individual string values
 484                          * are variable length (include separator for each)
 485                          */
 486                         for (i = 0; i < obj_desc->buffer.length; i++) {
 487                                 if (obj_desc->buffer.pointer[i] >= 100) {
 488                                         string_length += 4;
 489                                 } else if (obj_desc->buffer.pointer[i] >= 10) {
 490                                         string_length += 3;
 491                                 } else {
 492                                         string_length += 2;
 493                                 }
 494                         }
 495                         break;
 496
 497                 case ACPI_IMPLICIT_CONVERT_HEX:
 498                         /*
 499                          * From the ACPI spec:
 500                          *"The entire contents of the buffer are converted to a string of
 501                          * two-character hexadecimal numbers, each separated by a space."
 502                          */
 503                         separator = ' ';
 504                         string_length = (obj_desc->buffer.length * 3);
 505                         break;
 506
 507                 case ACPI_EXPLICIT_CONVERT_HEX: /* Used by to_hex_string */
 508                         /*
 509                          * From ACPI: "If Data is a buffer, it is converted to a string of
 510                          * hexadecimal values separated by commas."
 511                          */
 512                         string_length = (obj_desc->buffer.length * 3);
 513                         break;
 514
 515                 default:
 516                         return_ACPI_STATUS(AE_BAD_PARAMETER);
 517                 }
 518
 519                 /*
 520                  * Create a new string object and string buffer
 521                  * (-1 because of extra separator included in string_length from above)
 522                  * Allow creation of zero-length strings from zero-length buffers.
 523                  */
 524                 if (string_length) {
 525                         string_length--;
 526                 }
 527
 528                 return_desc =
 529                     acpi_ut_create_string_object((acpi_size)string_length);
 530                 if (!return_desc) {
 531                         return_ACPI_STATUS(AE_NO_MEMORY);
 532                 }
 533
 534                 new_buf = return_desc->buffer.pointer;
 535
 536                 /*
 537                  * Convert buffer bytes to hex or decimal values
 538                  * (separated by commas or spaces)
 539                  */
 540                 for (i = 0; i < obj_desc->buffer.length; i++) {
 541                         new_buf += acpi_ex_convert_to_ascii((u64) obj_desc->
 542                                                             buffer.pointer[i],
 543                                                             base, new_buf, 1);
 544                         *new_buf++ = separator; /* each separated by a comma or space */
 545                 }
 546
 547                 /*
 548                  * Null terminate the string
 549                  * (overwrites final comma/space from above)
 550                  */
 551                 if (obj_desc->buffer.length) {
 552                         new_buf--;
 553                 }
 554                 *new_buf = 0;
 555                 break;
 556
 557         default:
 558
 559                 return_ACPI_STATUS(AE_TYPE);
 560         }
 561
 562         *result_desc = return_desc;
 563         return_ACPI_STATUS(AE_OK);
 564 }
 565
 566 /*******************************************************************************
 567  *
 568  * FUNCTION:    acpi_ex_convert_to_target_type
 569  *
 570  * PARAMETERS:  destination_type    - Current type of the destination
 571  *              source_desc         - Source object to be converted.
 572  *              result_desc         - Where the converted object is returned
 573  *              walk_state          - Current method state
 574  *
 575  * RETURN:      Status
 576  *
 577  * DESCRIPTION: Implements "implicit conversion" rules for storing an object.
 578  *
 579  ******************************************************************************/
 580
 581 acpi_status
 582 acpi_ex_convert_to_target_type(acpi_object_type destination_type,
 583                                union acpi_operand_object *source_desc,
 584                                union acpi_operand_object **result_desc,
 585                                struct acpi_walk_state *walk_state)
 586 {
 587         acpi_status status = AE_OK;
 588
 589         ACPI_FUNCTION_TRACE(ex_convert_to_target_type);
 590
 591         /* Default behavior */
 592
 593         *result_desc = source_desc;
 594
 595         /*
 596          * If required by the target,
 597          * perform implicit conversion on the source before we store it.
 598          */
 599         switch (GET_CURRENT_ARG_TYPE(walk_state->op_info->runtime_args)) {
 600         case ARGI_SIMPLE_TARGET:
 601         case ARGI_INTEGER_REF:  /* Handles Increment, Decrement cases */
 602
 603                 switch (destination_type) {
 604                 case ACPI_TYPE_LOCAL_REGION_FIELD:
 605                         /*
 606                          * Named field can always handle conversions
 607                          */
 608                         break;
 609
 610                 default:
 611
 612                         /* No conversion allowed for these types */
 613
 614                         if (destination_type != source_desc->common.type) {
 615                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 616                                                   "Explicit operator, will store (%s) over existing type (%s)\n",
 617                                                   acpi_ut_get_object_type_name
 618                                                   (source_desc),
 619                                                   acpi_ut_get_type_name
 620                                                   (destination_type)));
 621                                 status = AE_TYPE;
 622                         }
 623                 }
 624                 break;
 625
 626         case ARGI_TARGETREF:
 627         case ARGI_STORE_TARGET:
 628
 629                 switch (destination_type) {
 630                 case ACPI_TYPE_INTEGER:
 631                 case ACPI_TYPE_BUFFER_FIELD:
 632                 case ACPI_TYPE_LOCAL_BANK_FIELD:
 633                 case ACPI_TYPE_LOCAL_INDEX_FIELD:
 634                         /*
 635                          * These types require an Integer operand. We can convert
 636                          * a Buffer or a String to an Integer if necessary.
 637                          */
 638                         status =
 639                             acpi_ex_convert_to_integer(source_desc, result_desc,
 640                                                        ACPI_IMPLICIT_CONVERSION);
 641                         break;
 642
 643                 case ACPI_TYPE_STRING:
 644                         /*
 645                          * The operand must be a String. We can convert an
 646                          * Integer or Buffer if necessary
 647                          */
 648                         status =
 649                             acpi_ex_convert_to_string(source_desc, result_desc,
 650                                                       ACPI_IMPLICIT_CONVERT_HEX);
 651                         break;
 652
 653                 case ACPI_TYPE_BUFFER:
 654                         /*
 655                          * The operand must be a Buffer. We can convert an
 656                          * Integer or String if necessary
 657                          */
 658                         status =
 659                             acpi_ex_convert_to_buffer(source_desc, result_desc);
 660                         break;
 661
 662                 default:
 663
 664                         ACPI_ERROR((AE_INFO,
 665                                     "Bad destination type during conversion: 0x%X",
 666                                     destination_type));
 667                         status = AE_AML_INTERNAL;
 668                         break;
 669                 }
 670                 break;
 671
 672         case ARGI_REFERENCE:
 673                 /*
 674                  * create_xxxx_field cases - we are storing the field object into the name
 675                  */
 676                 break;
 677
 678         default:
 679
 680                 ACPI_ERROR((AE_INFO,
 681                             "Unknown Target type ID 0x%X AmlOpcode 0x%X DestType %s",
 682                             GET_CURRENT_ARG_TYPE(walk_state->op_info->
 683                                                  runtime_args),
 684                             walk_state->opcode,
 685                             acpi_ut_get_type_name(destination_type)));
 686                 status = AE_AML_INTERNAL;
 687         }
 688
 689         /*
 690          * Source-to-Target conversion semantics:
 691          *
 692          * If conversion to the target type cannot be performed, then simply
 693          * overwrite the target with the new object and type.
 694          */
 695         if (status == AE_TYPE) {
 696                 status = AE_OK;
 697         }
 698
 699         return_ACPI_STATUS(status);
 700 }