1 /****************************************************************************** 2 * 3 * Module Name: exconvrt - Object conversion routines 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2013, 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 * flags - 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, u32 flags) 74 { 75 union acpi_operand_object *return_desc; 76 u8 *pointer; 77 u64 result; 78 u32 i; 79 u32 count; 80 acpi_status status; 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 status = acpi_ut_strtoul64((char *)pointer, flags, &result); 128 if (ACPI_FAILURE(status)) { 129 return_ACPI_STATUS(status); 130 } 131 break; 132 133 case ACPI_TYPE_BUFFER: 134 135 /* Check for zero-length buffer */ 136 137 if (!count) { 138 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); 139 } 140 141 /* Transfer no more than an integer's worth of data */ 142 143 if (count > acpi_gbl_integer_byte_width) { 144 count = acpi_gbl_integer_byte_width; 145 } 146 147 /* 148 * Convert buffer to an integer - we simply grab enough raw data 149 * from the buffer to fill an integer 150 */ 151 for (i = 0; i < count; i++) { 152 /* 153 * Get next byte and shift it into the Result. 154 * Little endian is used, meaning that the first byte of the buffer 155 * is the LSB of the integer 156 */ 157 result |= (((u64) pointer[i]) << (i * 8)); 158 } 159 break; 160 161 default: 162 163 /* No other types can get here */ 164 165 break; 166 } 167 168 /* Create a new integer */ 169 170 return_desc = acpi_ut_create_integer_object(result); 171 if (!return_desc) { 172 return_ACPI_STATUS(AE_NO_MEMORY); 173 } 174 175 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n", 176 ACPI_FORMAT_UINT64(result))); 177 178 /* Save the Result */ 179 180 (void)acpi_ex_truncate_for32bit_table(return_desc); 181 *result_desc = return_desc; 182 return_ACPI_STATUS(AE_OK); 183 } 184 185 /******************************************************************************* 186 * 187 * FUNCTION: acpi_ex_convert_to_buffer 188 * 189 * PARAMETERS: obj_desc - Object to be converted. Must be an 190 * Integer, Buffer, or String 191 * result_desc - Where the new buffer object is returned 192 * 193 * RETURN: Status 194 * 195 * DESCRIPTION: Convert an ACPI Object to a Buffer 196 * 197 ******************************************************************************/ 198 199 acpi_status 200 acpi_ex_convert_to_buffer(union acpi_operand_object *obj_desc, 201 union acpi_operand_object **result_desc) 202 { 203 union acpi_operand_object *return_desc; 204 u8 *new_buf; 205 206 ACPI_FUNCTION_TRACE_PTR(ex_convert_to_buffer, obj_desc); 207 208 switch (obj_desc->common.type) { 209 case ACPI_TYPE_BUFFER: 210 211 /* No conversion necessary */ 212 213 *result_desc = obj_desc; 214 return_ACPI_STATUS(AE_OK); 215 216 case ACPI_TYPE_INTEGER: 217 /* 218 * Create a new Buffer object. 219 * Need enough space for one integer 220 */ 221 return_desc = 222 acpi_ut_create_buffer_object(acpi_gbl_integer_byte_width); 223 if (!return_desc) { 224 return_ACPI_STATUS(AE_NO_MEMORY); 225 } 226 227 /* Copy the integer to the buffer, LSB first */ 228 229 new_buf = return_desc->buffer.pointer; 230 ACPI_MEMCPY(new_buf, 231 &obj_desc->integer.value, 232 acpi_gbl_integer_byte_width); 233 break; 234 235 case ACPI_TYPE_STRING: 236 /* 237 * Create a new Buffer object 238 * Size will be the string length 239 * 240 * NOTE: Add one to the string length to include the null terminator. 241 * The ACPI spec is unclear on this subject, but there is existing 242 * ASL/AML code that depends on the null being transferred to the new 243 * buffer. 244 */ 245 return_desc = acpi_ut_create_buffer_object((acpi_size) 246 obj_desc->string. 247 length + 1); 248 if (!return_desc) { 249 return_ACPI_STATUS(AE_NO_MEMORY); 250 } 251 252 /* Copy the string to the buffer */ 253 254 new_buf = return_desc->buffer.pointer; 255 ACPI_STRNCPY((char *)new_buf, (char *)obj_desc->string.pointer, 256 obj_desc->string.length); 257 break; 258 259 default: 260 261 return_ACPI_STATUS(AE_TYPE); 262 } 263 264 /* Mark buffer initialized */ 265 266 return_desc->common.flags |= AOPOBJ_DATA_VALID; 267 *result_desc = return_desc; 268 return_ACPI_STATUS(AE_OK); 269 } 270 271 /******************************************************************************* 272 * 273 * FUNCTION: acpi_ex_convert_to_ascii 274 * 275 * PARAMETERS: integer - Value to be converted 276 * base - ACPI_STRING_DECIMAL or ACPI_STRING_HEX 277 * string - Where the string is returned 278 * data_width - Size of data item to be converted, in bytes 279 * 280 * RETURN: Actual string length 281 * 282 * DESCRIPTION: Convert an ACPI Integer to a hex or decimal string 283 * 284 ******************************************************************************/ 285 286 static u32 287 acpi_ex_convert_to_ascii(u64 integer, u16 base, u8 *string, u8 data_width) 288 { 289 u64 digit; 290 u32 i; 291 u32 j; 292 u32 k = 0; 293 u32 hex_length; 294 u32 decimal_length; 295 u32 remainder; 296 u8 supress_zeros; 297 298 ACPI_FUNCTION_ENTRY(); 299 300 switch (base) { 301 case 10: 302 303 /* Setup max length for the decimal number */ 304 305 switch (data_width) { 306 case 1: 307 308 decimal_length = ACPI_MAX8_DECIMAL_DIGITS; 309 break; 310 311 case 4: 312 313 decimal_length = ACPI_MAX32_DECIMAL_DIGITS; 314 break; 315 316 case 8: 317 default: 318 319 decimal_length = ACPI_MAX64_DECIMAL_DIGITS; 320 break; 321 } 322 323 supress_zeros = TRUE; /* No leading zeros */ 324 remainder = 0; 325 326 for (i = decimal_length; i > 0; i--) { 327 328 /* Divide by nth factor of 10 */ 329 330 digit = integer; 331 for (j = 0; j < i; j++) { 332 (void)acpi_ut_short_divide(digit, 10, &digit, 333 &remainder); 334 } 335 336 /* Handle leading zeros */ 337 338 if (remainder != 0) { 339 supress_zeros = FALSE; 340 } 341 342 if (!supress_zeros) { 343 string[k] = (u8) (ACPI_ASCII_ZERO + remainder); 344 k++; 345 } 346 } 347 break; 348 349 case 16: 350 351 /* hex_length: 2 ascii hex chars per data byte */ 352 353 hex_length = ACPI_MUL_2(data_width); 354 for (i = 0, j = (hex_length - 1); i < hex_length; i++, j--) { 355 356 /* Get one hex digit, most significant digits first */ 357 358 string[k] = 359 (u8) acpi_ut_hex_to_ascii_char(integer, 360 ACPI_MUL_4(j)); 361 k++; 362 } 363 break; 364 365 default: 366 return (0); 367 } 368 369 /* 370 * Since leading zeros are suppressed, we must check for the case where 371 * the integer equals 0 372 * 373 * Finally, null terminate the string and return the length 374 */ 375 if (!k) { 376 string[0] = ACPI_ASCII_ZERO; 377 k = 1; 378 } 379 380 string[k] = 0; 381 return ((u32) k); 382 } 383 384 /******************************************************************************* 385 * 386 * FUNCTION: acpi_ex_convert_to_string 387 * 388 * PARAMETERS: obj_desc - Object to be converted. Must be an 389 * Integer, Buffer, or String 390 * result_desc - Where the string object is returned 391 * type - String flags (base and conversion type) 392 * 393 * RETURN: Status 394 * 395 * DESCRIPTION: Convert an ACPI Object to a string 396 * 397 ******************************************************************************/ 398 399 acpi_status 400 acpi_ex_convert_to_string(union acpi_operand_object * obj_desc, 401 union acpi_operand_object ** result_desc, u32 type) 402 { 403 union acpi_operand_object *return_desc; 404 u8 *new_buf; 405 u32 i; 406 u32 string_length = 0; 407 u16 base = 16; 408 u8 separator = ','; 409 410 ACPI_FUNCTION_TRACE_PTR(ex_convert_to_string, obj_desc); 411 412 switch (obj_desc->common.type) { 413 case ACPI_TYPE_STRING: 414 415 /* No conversion necessary */ 416 417 *result_desc = obj_desc; 418 return_ACPI_STATUS(AE_OK); 419 420 case ACPI_TYPE_INTEGER: 421 422 switch (type) { 423 case ACPI_EXPLICIT_CONVERT_DECIMAL: 424 425 /* Make room for maximum decimal number */ 426 427 string_length = ACPI_MAX_DECIMAL_DIGITS; 428 base = 10; 429 break; 430 431 default: 432 433 /* Two hex string characters for each integer byte */ 434 435 string_length = ACPI_MUL_2(acpi_gbl_integer_byte_width); 436 break; 437 } 438 439 /* 440 * Create a new String 441 * Need enough space for one ASCII integer (plus null terminator) 442 */ 443 return_desc = 444 acpi_ut_create_string_object((acpi_size) string_length); 445 if (!return_desc) { 446 return_ACPI_STATUS(AE_NO_MEMORY); 447 } 448 449 new_buf = return_desc->buffer.pointer; 450 451 /* Convert integer to string */ 452 453 string_length = 454 acpi_ex_convert_to_ascii(obj_desc->integer.value, base, 455 new_buf, 456 acpi_gbl_integer_byte_width); 457 458 /* Null terminate at the correct place */ 459 460 return_desc->string.length = string_length; 461 new_buf[string_length] = 0; 462 break; 463 464 case ACPI_TYPE_BUFFER: 465 466 /* Setup string length, base, and separator */ 467 468 switch (type) { 469 case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by to_decimal_string */ 470 /* 471 * From ACPI: "If Data is a buffer, it is converted to a string of 472 * decimal values separated by commas." 473 */ 474 base = 10; 475 476 /* 477 * Calculate the final string length. Individual string values 478 * are variable length (include separator for each) 479 */ 480 for (i = 0; i < obj_desc->buffer.length; i++) { 481 if (obj_desc->buffer.pointer[i] >= 100) { 482 string_length += 4; 483 } else if (obj_desc->buffer.pointer[i] >= 10) { 484 string_length += 3; 485 } else { 486 string_length += 2; 487 } 488 } 489 break; 490 491 case ACPI_IMPLICIT_CONVERT_HEX: 492 /* 493 * From the ACPI spec: 494 *"The entire contents of the buffer are converted to a string of 495 * two-character hexadecimal numbers, each separated by a space." 496 */ 497 separator = ' '; 498 string_length = (obj_desc->buffer.length * 3); 499 break; 500 501 case ACPI_EXPLICIT_CONVERT_HEX: /* Used by to_hex_string */ 502 /* 503 * From ACPI: "If Data is a buffer, it is converted to a string of 504 * hexadecimal values separated by commas." 505 */ 506 string_length = (obj_desc->buffer.length * 3); 507 break; 508 509 default: 510 return_ACPI_STATUS(AE_BAD_PARAMETER); 511 } 512 513 /* 514 * Create a new string object and string buffer 515 * (-1 because of extra separator included in string_length from above) 516 * Allow creation of zero-length strings from zero-length buffers. 517 */ 518 if (string_length) { 519 string_length--; 520 } 521 522 return_desc = 523 acpi_ut_create_string_object((acpi_size) string_length); 524 if (!return_desc) { 525 return_ACPI_STATUS(AE_NO_MEMORY); 526 } 527 528 new_buf = return_desc->buffer.pointer; 529 530 /* 531 * Convert buffer bytes to hex or decimal values 532 * (separated by commas or spaces) 533 */ 534 for (i = 0; i < obj_desc->buffer.length; i++) { 535 new_buf += acpi_ex_convert_to_ascii((u64) obj_desc-> 536 buffer.pointer[i], 537 base, new_buf, 1); 538 *new_buf++ = separator; /* each separated by a comma or space */ 539 } 540 541 /* 542 * Null terminate the string 543 * (overwrites final comma/space from above) 544 */ 545 if (obj_desc->buffer.length) { 546 new_buf--; 547 } 548 *new_buf = 0; 549 break; 550 551 default: 552 553 return_ACPI_STATUS(AE_TYPE); 554 } 555 556 *result_desc = return_desc; 557 return_ACPI_STATUS(AE_OK); 558 } 559 560 /******************************************************************************* 561 * 562 * FUNCTION: acpi_ex_convert_to_target_type 563 * 564 * PARAMETERS: destination_type - Current type of the destination 565 * source_desc - Source object to be converted. 566 * result_desc - Where the converted object is returned 567 * walk_state - Current method state 568 * 569 * RETURN: Status 570 * 571 * DESCRIPTION: Implements "implicit conversion" rules for storing an object. 572 * 573 ******************************************************************************/ 574 575 acpi_status 576 acpi_ex_convert_to_target_type(acpi_object_type destination_type, 577 union acpi_operand_object *source_desc, 578 union acpi_operand_object **result_desc, 579 struct acpi_walk_state *walk_state) 580 { 581 acpi_status status = AE_OK; 582 583 ACPI_FUNCTION_TRACE(ex_convert_to_target_type); 584 585 /* Default behavior */ 586 587 *result_desc = source_desc; 588 589 /* 590 * If required by the target, 591 * perform implicit conversion on the source before we store it. 592 */ 593 switch (GET_CURRENT_ARG_TYPE(walk_state->op_info->runtime_args)) { 594 case ARGI_SIMPLE_TARGET: 595 case ARGI_FIXED_TARGET: 596 case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */ 597 598 switch (destination_type) { 599 case ACPI_TYPE_LOCAL_REGION_FIELD: 600 /* 601 * Named field can always handle conversions 602 */ 603 break; 604 605 default: 606 607 /* No conversion allowed for these types */ 608 609 if (destination_type != source_desc->common.type) { 610 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 611 "Explicit operator, will store (%s) over existing type (%s)\n", 612 acpi_ut_get_object_type_name 613 (source_desc), 614 acpi_ut_get_type_name 615 (destination_type))); 616 status = AE_TYPE; 617 } 618 } 619 break; 620 621 case ARGI_TARGETREF: 622 623 switch (destination_type) { 624 case ACPI_TYPE_INTEGER: 625 case ACPI_TYPE_BUFFER_FIELD: 626 case ACPI_TYPE_LOCAL_BANK_FIELD: 627 case ACPI_TYPE_LOCAL_INDEX_FIELD: 628 /* 629 * These types require an Integer operand. We can convert 630 * a Buffer or a String to an Integer if necessary. 631 */ 632 status = 633 acpi_ex_convert_to_integer(source_desc, result_desc, 634 16); 635 break; 636 637 case ACPI_TYPE_STRING: 638 /* 639 * The operand must be a String. We can convert an 640 * Integer or Buffer if necessary 641 */ 642 status = 643 acpi_ex_convert_to_string(source_desc, result_desc, 644 ACPI_IMPLICIT_CONVERT_HEX); 645 break; 646 647 case ACPI_TYPE_BUFFER: 648 /* 649 * The operand must be a Buffer. We can convert an 650 * Integer or String if necessary 651 */ 652 status = 653 acpi_ex_convert_to_buffer(source_desc, result_desc); 654 break; 655 656 default: 657 658 ACPI_ERROR((AE_INFO, 659 "Bad destination type during conversion: 0x%X", 660 destination_type)); 661 status = AE_AML_INTERNAL; 662 break; 663 } 664 break; 665 666 case ARGI_REFERENCE: 667 /* 668 * create_xxxx_field cases - we are storing the field object into the name 669 */ 670 break; 671 672 default: 673 674 ACPI_ERROR((AE_INFO, 675 "Unknown Target type ID 0x%X AmlOpcode 0x%X DestType %s", 676 GET_CURRENT_ARG_TYPE(walk_state->op_info-> 677 runtime_args), 678 walk_state->opcode, 679 acpi_ut_get_type_name(destination_type))); 680 status = AE_AML_INTERNAL; 681 } 682 683 /* 684 * Source-to-Target conversion semantics: 685 * 686 * If conversion to the target type cannot be performed, then simply 687 * overwrite the target with the new object and type. 688 */ 689 if (status == AE_TYPE) { 690 status = AE_OK; 691 } 692 693 return_ACPI_STATUS(status); 694 } 695