1 /****************************************************************************** 2 * 3 * Module Name: exoparg1 - AML execution - opcodes with 1 argument 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 "acparser.h" 47 #include "acdispat.h" 48 #include "acinterp.h" 49 #include "amlcode.h" 50 #include "acnamesp.h" 51 52 #define _COMPONENT ACPI_EXECUTER 53 ACPI_MODULE_NAME("exoparg1") 54 55 /*! 56 * Naming convention for AML interpreter execution routines. 57 * 58 * The routines that begin execution of AML opcodes are named with a common 59 * convention based upon the number of arguments, the number of target operands, 60 * and whether or not a value is returned: 61 * 62 * AcpiExOpcode_xA_yT_zR 63 * 64 * Where: 65 * 66 * xA - ARGUMENTS: The number of arguments (input operands) that are 67 * required for this opcode type (0 through 6 args). 68 * yT - TARGETS: The number of targets (output operands) that are required 69 * for this opcode type (0, 1, or 2 targets). 70 * zR - RETURN VALUE: Indicates whether this opcode type returns a value 71 * as the function return (0 or 1). 72 * 73 * The AcpiExOpcode* functions are called via the Dispatcher component with 74 * fully resolved operands. 75 !*/ 76 /******************************************************************************* 77 * 78 * FUNCTION: acpi_ex_opcode_0A_0T_1R 79 * 80 * PARAMETERS: walk_state - Current state (contains AML opcode) 81 * 82 * RETURN: Status 83 * 84 * DESCRIPTION: Execute operator with no operands, one return value 85 * 86 ******************************************************************************/ 87 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state) 88 { 89 acpi_status status = AE_OK; 90 union acpi_operand_object *return_desc = NULL; 91 92 ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R, 93 acpi_ps_get_opcode_name(walk_state->opcode)); 94 95 /* Examine the AML opcode */ 96 97 switch (walk_state->opcode) { 98 case AML_TIMER_OP: /* Timer () */ 99 100 /* Create a return object of type Integer */ 101 102 return_desc = 103 acpi_ut_create_integer_object(acpi_os_get_timer()); 104 if (!return_desc) { 105 status = AE_NO_MEMORY; 106 goto cleanup; 107 } 108 break; 109 110 default: /* Unknown opcode */ 111 112 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 113 walk_state->opcode)); 114 status = AE_AML_BAD_OPCODE; 115 break; 116 } 117 118 cleanup: 119 120 /* Delete return object on error */ 121 122 if ((ACPI_FAILURE(status)) || walk_state->result_obj) { 123 acpi_ut_remove_reference(return_desc); 124 walk_state->result_obj = NULL; 125 } else { 126 /* Save the return value */ 127 128 walk_state->result_obj = return_desc; 129 } 130 131 return_ACPI_STATUS(status); 132 } 133 134 /******************************************************************************* 135 * 136 * FUNCTION: acpi_ex_opcode_1A_0T_0R 137 * 138 * PARAMETERS: walk_state - Current state (contains AML opcode) 139 * 140 * RETURN: Status 141 * 142 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on 143 * object stack 144 * 145 ******************************************************************************/ 146 147 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state) 148 { 149 union acpi_operand_object **operand = &walk_state->operands[0]; 150 acpi_status status = AE_OK; 151 152 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R, 153 acpi_ps_get_opcode_name(walk_state->opcode)); 154 155 /* Examine the AML opcode */ 156 157 switch (walk_state->opcode) { 158 case AML_RELEASE_OP: /* Release (mutex_object) */ 159 160 status = acpi_ex_release_mutex(operand[0], walk_state); 161 break; 162 163 case AML_RESET_OP: /* Reset (event_object) */ 164 165 status = acpi_ex_system_reset_event(operand[0]); 166 break; 167 168 case AML_SIGNAL_OP: /* Signal (event_object) */ 169 170 status = acpi_ex_system_signal_event(operand[0]); 171 break; 172 173 case AML_SLEEP_OP: /* Sleep (msec_time) */ 174 175 status = acpi_ex_system_do_sleep(operand[0]->integer.value); 176 break; 177 178 case AML_STALL_OP: /* Stall (usec_time) */ 179 180 status = 181 acpi_ex_system_do_stall((u32) operand[0]->integer.value); 182 break; 183 184 case AML_UNLOAD_OP: /* Unload (Handle) */ 185 186 status = acpi_ex_unload_table(operand[0]); 187 break; 188 189 default: /* Unknown opcode */ 190 191 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 192 walk_state->opcode)); 193 status = AE_AML_BAD_OPCODE; 194 break; 195 } 196 197 return_ACPI_STATUS(status); 198 } 199 200 /******************************************************************************* 201 * 202 * FUNCTION: acpi_ex_opcode_1A_1T_0R 203 * 204 * PARAMETERS: walk_state - Current state (contains AML opcode) 205 * 206 * RETURN: Status 207 * 208 * DESCRIPTION: Execute opcode with one argument, one target, and no 209 * return value. 210 * 211 ******************************************************************************/ 212 213 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state) 214 { 215 acpi_status status = AE_OK; 216 union acpi_operand_object **operand = &walk_state->operands[0]; 217 218 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R, 219 acpi_ps_get_opcode_name(walk_state->opcode)); 220 221 /* Examine the AML opcode */ 222 223 switch (walk_state->opcode) { 224 case AML_LOAD_OP: 225 226 status = acpi_ex_load_op(operand[0], operand[1], walk_state); 227 break; 228 229 default: /* Unknown opcode */ 230 231 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 232 walk_state->opcode)); 233 status = AE_AML_BAD_OPCODE; 234 goto cleanup; 235 } 236 237 cleanup: 238 239 return_ACPI_STATUS(status); 240 } 241 242 /******************************************************************************* 243 * 244 * FUNCTION: acpi_ex_opcode_1A_1T_1R 245 * 246 * PARAMETERS: walk_state - Current state (contains AML opcode) 247 * 248 * RETURN: Status 249 * 250 * DESCRIPTION: Execute opcode with one argument, one target, and a 251 * return value. 252 * 253 ******************************************************************************/ 254 255 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state) 256 { 257 acpi_status status = AE_OK; 258 union acpi_operand_object **operand = &walk_state->operands[0]; 259 union acpi_operand_object *return_desc = NULL; 260 union acpi_operand_object *return_desc2 = NULL; 261 u32 temp32; 262 u32 i; 263 u64 power_of_ten; 264 u64 digit; 265 266 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R, 267 acpi_ps_get_opcode_name(walk_state->opcode)); 268 269 /* Examine the AML opcode */ 270 271 switch (walk_state->opcode) { 272 case AML_BIT_NOT_OP: 273 case AML_FIND_SET_LEFT_BIT_OP: 274 case AML_FIND_SET_RIGHT_BIT_OP: 275 case AML_FROM_BCD_OP: 276 case AML_TO_BCD_OP: 277 case AML_COND_REF_OF_OP: 278 279 /* Create a return object of type Integer for these opcodes */ 280 281 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); 282 if (!return_desc) { 283 status = AE_NO_MEMORY; 284 goto cleanup; 285 } 286 287 switch (walk_state->opcode) { 288 case AML_BIT_NOT_OP: /* Not (Operand, Result) */ 289 290 return_desc->integer.value = ~operand[0]->integer.value; 291 break; 292 293 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */ 294 295 return_desc->integer.value = operand[0]->integer.value; 296 297 /* 298 * Acpi specification describes Integer type as a little 299 * endian unsigned value, so this boundary condition is valid. 300 */ 301 for (temp32 = 0; return_desc->integer.value && 302 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) { 303 return_desc->integer.value >>= 1; 304 } 305 306 return_desc->integer.value = temp32; 307 break; 308 309 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */ 310 311 return_desc->integer.value = operand[0]->integer.value; 312 313 /* 314 * The Acpi specification describes Integer type as a little 315 * endian unsigned value, so this boundary condition is valid. 316 */ 317 for (temp32 = 0; return_desc->integer.value && 318 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) { 319 return_desc->integer.value <<= 1; 320 } 321 322 /* Since the bit position is one-based, subtract from 33 (65) */ 323 324 return_desc->integer.value = 325 temp32 == 326 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32; 327 break; 328 329 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */ 330 /* 331 * The 64-bit ACPI integer can hold 16 4-bit BCD characters 332 * (if table is 32-bit, integer can hold 8 BCD characters) 333 * Convert each 4-bit BCD value 334 */ 335 power_of_ten = 1; 336 return_desc->integer.value = 0; 337 digit = operand[0]->integer.value; 338 339 /* Convert each BCD digit (each is one nybble wide) */ 340 341 for (i = 0; 342 (i < acpi_gbl_integer_nybble_width) && (digit > 0); 343 i++) { 344 345 /* Get the least significant 4-bit BCD digit */ 346 347 temp32 = ((u32) digit) & 0xF; 348 349 /* Check the range of the digit */ 350 351 if (temp32 > 9) { 352 ACPI_ERROR((AE_INFO, 353 "BCD digit too large (not decimal): 0x%X", 354 temp32)); 355 356 status = AE_AML_NUMERIC_OVERFLOW; 357 goto cleanup; 358 } 359 360 /* Sum the digit into the result with the current power of 10 */ 361 362 return_desc->integer.value += 363 (((u64) temp32) * power_of_ten); 364 365 /* Shift to next BCD digit */ 366 367 digit >>= 4; 368 369 /* Next power of 10 */ 370 371 power_of_ten *= 10; 372 } 373 break; 374 375 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */ 376 377 return_desc->integer.value = 0; 378 digit = operand[0]->integer.value; 379 380 /* Each BCD digit is one nybble wide */ 381 382 for (i = 0; 383 (i < acpi_gbl_integer_nybble_width) && (digit > 0); 384 i++) { 385 (void)acpi_ut_short_divide(digit, 10, &digit, 386 &temp32); 387 388 /* 389 * Insert the BCD digit that resides in the 390 * remainder from above 391 */ 392 return_desc->integer.value |= 393 (((u64) temp32) << ACPI_MUL_4(i)); 394 } 395 396 /* Overflow if there is any data left in Digit */ 397 398 if (digit > 0) { 399 ACPI_ERROR((AE_INFO, 400 "Integer too large to convert to BCD: 0x%8.8X%8.8X", 401 ACPI_FORMAT_UINT64(operand[0]-> 402 integer.value))); 403 status = AE_AML_NUMERIC_OVERFLOW; 404 goto cleanup; 405 } 406 break; 407 408 case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */ 409 /* 410 * This op is a little strange because the internal return value is 411 * different than the return value stored in the result descriptor 412 * (There are really two return values) 413 */ 414 if ((struct acpi_namespace_node *)operand[0] == 415 acpi_gbl_root_node) { 416 /* 417 * This means that the object does not exist in the namespace, 418 * return FALSE 419 */ 420 return_desc->integer.value = 0; 421 goto cleanup; 422 } 423 424 /* Get the object reference, store it, and remove our reference */ 425 426 status = acpi_ex_get_object_reference(operand[0], 427 &return_desc2, 428 walk_state); 429 if (ACPI_FAILURE(status)) { 430 goto cleanup; 431 } 432 433 status = 434 acpi_ex_store(return_desc2, operand[1], walk_state); 435 acpi_ut_remove_reference(return_desc2); 436 437 /* The object exists in the namespace, return TRUE */ 438 439 return_desc->integer.value = ACPI_UINT64_MAX; 440 goto cleanup; 441 442 default: 443 444 /* No other opcodes get here */ 445 446 break; 447 } 448 break; 449 450 case AML_STORE_OP: /* Store (Source, Target) */ 451 /* 452 * A store operand is typically a number, string, buffer or lvalue 453 * Be careful about deleting the source object, 454 * since the object itself may have been stored. 455 */ 456 status = acpi_ex_store(operand[0], operand[1], walk_state); 457 if (ACPI_FAILURE(status)) { 458 return_ACPI_STATUS(status); 459 } 460 461 /* It is possible that the Store already produced a return object */ 462 463 if (!walk_state->result_obj) { 464 /* 465 * Normally, we would remove a reference on the Operand[0] 466 * parameter; But since it is being used as the internal return 467 * object (meaning we would normally increment it), the two 468 * cancel out, and we simply don't do anything. 469 */ 470 walk_state->result_obj = operand[0]; 471 walk_state->operands[0] = NULL; /* Prevent deletion */ 472 } 473 return_ACPI_STATUS(status); 474 475 /* 476 * ACPI 2.0 Opcodes 477 */ 478 case AML_COPY_OP: /* Copy (Source, Target) */ 479 480 status = 481 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc, 482 walk_state); 483 break; 484 485 case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */ 486 487 status = acpi_ex_convert_to_string(operand[0], &return_desc, 488 ACPI_EXPLICIT_CONVERT_DECIMAL); 489 if (return_desc == operand[0]) { 490 491 /* No conversion performed, add ref to handle return value */ 492 acpi_ut_add_reference(return_desc); 493 } 494 break; 495 496 case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */ 497 498 status = acpi_ex_convert_to_string(operand[0], &return_desc, 499 ACPI_EXPLICIT_CONVERT_HEX); 500 if (return_desc == operand[0]) { 501 502 /* No conversion performed, add ref to handle return value */ 503 acpi_ut_add_reference(return_desc); 504 } 505 break; 506 507 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */ 508 509 status = acpi_ex_convert_to_buffer(operand[0], &return_desc); 510 if (return_desc == operand[0]) { 511 512 /* No conversion performed, add ref to handle return value */ 513 acpi_ut_add_reference(return_desc); 514 } 515 break; 516 517 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */ 518 519 status = acpi_ex_convert_to_integer(operand[0], &return_desc, 520 ACPI_ANY_BASE); 521 if (return_desc == operand[0]) { 522 523 /* No conversion performed, add ref to handle return value */ 524 acpi_ut_add_reference(return_desc); 525 } 526 break; 527 528 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */ 529 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */ 530 531 /* These are two obsolete opcodes */ 532 533 ACPI_ERROR((AE_INFO, 534 "%s is obsolete and not implemented", 535 acpi_ps_get_opcode_name(walk_state->opcode))); 536 status = AE_SUPPORT; 537 goto cleanup; 538 539 default: /* Unknown opcode */ 540 541 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 542 walk_state->opcode)); 543 status = AE_AML_BAD_OPCODE; 544 goto cleanup; 545 } 546 547 if (ACPI_SUCCESS(status)) { 548 549 /* Store the return value computed above into the target object */ 550 551 status = acpi_ex_store(return_desc, operand[1], walk_state); 552 } 553 554 cleanup: 555 556 /* Delete return object on error */ 557 558 if (ACPI_FAILURE(status)) { 559 acpi_ut_remove_reference(return_desc); 560 } 561 562 /* Save return object on success */ 563 564 else if (!walk_state->result_obj) { 565 walk_state->result_obj = return_desc; 566 } 567 568 return_ACPI_STATUS(status); 569 } 570 571 /******************************************************************************* 572 * 573 * FUNCTION: acpi_ex_opcode_1A_0T_1R 574 * 575 * PARAMETERS: walk_state - Current state (contains AML opcode) 576 * 577 * RETURN: Status 578 * 579 * DESCRIPTION: Execute opcode with one argument, no target, and a return value 580 * 581 ******************************************************************************/ 582 583 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state) 584 { 585 union acpi_operand_object **operand = &walk_state->operands[0]; 586 union acpi_operand_object *temp_desc; 587 union acpi_operand_object *return_desc = NULL; 588 acpi_status status = AE_OK; 589 u32 type; 590 u64 value; 591 592 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R, 593 acpi_ps_get_opcode_name(walk_state->opcode)); 594 595 /* Examine the AML opcode */ 596 597 switch (walk_state->opcode) { 598 case AML_LNOT_OP: /* LNot (Operand) */ 599 600 return_desc = acpi_ut_create_integer_object((u64) 0); 601 if (!return_desc) { 602 status = AE_NO_MEMORY; 603 goto cleanup; 604 } 605 606 /* 607 * Set result to ONES (TRUE) if Value == 0. Note: 608 * return_desc->Integer.Value is initially == 0 (FALSE) from above. 609 */ 610 if (!operand[0]->integer.value) { 611 return_desc->integer.value = ACPI_UINT64_MAX; 612 } 613 break; 614 615 case AML_DECREMENT_OP: /* Decrement (Operand) */ 616 case AML_INCREMENT_OP: /* Increment (Operand) */ 617 /* 618 * Create a new integer. Can't just get the base integer and 619 * increment it because it may be an Arg or Field. 620 */ 621 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); 622 if (!return_desc) { 623 status = AE_NO_MEMORY; 624 goto cleanup; 625 } 626 627 /* 628 * Since we are expecting a Reference operand, it can be either a 629 * NS Node or an internal object. 630 */ 631 temp_desc = operand[0]; 632 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) == 633 ACPI_DESC_TYPE_OPERAND) { 634 635 /* Internal reference object - prevent deletion */ 636 637 acpi_ut_add_reference(temp_desc); 638 } 639 640 /* 641 * Convert the Reference operand to an Integer (This removes a 642 * reference on the Operand[0] object) 643 * 644 * NOTE: We use LNOT_OP here in order to force resolution of the 645 * reference operand to an actual integer. 646 */ 647 status = 648 acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc, 649 walk_state); 650 if (ACPI_FAILURE(status)) { 651 ACPI_EXCEPTION((AE_INFO, status, 652 "While resolving operands for [%s]", 653 acpi_ps_get_opcode_name(walk_state-> 654 opcode))); 655 656 goto cleanup; 657 } 658 659 /* 660 * temp_desc is now guaranteed to be an Integer object -- 661 * Perform the actual increment or decrement 662 */ 663 if (walk_state->opcode == AML_INCREMENT_OP) { 664 return_desc->integer.value = 665 temp_desc->integer.value + 1; 666 } else { 667 return_desc->integer.value = 668 temp_desc->integer.value - 1; 669 } 670 671 /* Finished with this Integer object */ 672 673 acpi_ut_remove_reference(temp_desc); 674 675 /* 676 * Store the result back (indirectly) through the original 677 * Reference object 678 */ 679 status = acpi_ex_store(return_desc, operand[0], walk_state); 680 break; 681 682 case AML_TYPE_OP: /* object_type (source_object) */ 683 /* 684 * Note: The operand is not resolved at this point because we want to 685 * get the associated object, not its value. For example, we don't 686 * want to resolve a field_unit to its value, we want the actual 687 * field_unit object. 688 */ 689 690 /* Get the type of the base object */ 691 692 status = 693 acpi_ex_resolve_multiple(walk_state, operand[0], &type, 694 NULL); 695 if (ACPI_FAILURE(status)) { 696 goto cleanup; 697 } 698 699 /* Allocate a descriptor to hold the type. */ 700 701 return_desc = acpi_ut_create_integer_object((u64) type); 702 if (!return_desc) { 703 status = AE_NO_MEMORY; 704 goto cleanup; 705 } 706 break; 707 708 case AML_SIZE_OF_OP: /* size_of (source_object) */ 709 /* 710 * Note: The operand is not resolved at this point because we want to 711 * get the associated object, not its value. 712 */ 713 714 /* Get the base object */ 715 716 status = acpi_ex_resolve_multiple(walk_state, 717 operand[0], &type, 718 &temp_desc); 719 if (ACPI_FAILURE(status)) { 720 goto cleanup; 721 } 722 723 /* 724 * The type of the base object must be integer, buffer, string, or 725 * package. All others are not supported. 726 * 727 * NOTE: Integer is not specifically supported by the ACPI spec, 728 * but is supported implicitly via implicit operand conversion. 729 * rather than bother with conversion, we just use the byte width 730 * global (4 or 8 bytes). 731 */ 732 switch (type) { 733 case ACPI_TYPE_INTEGER: 734 735 value = acpi_gbl_integer_byte_width; 736 break; 737 738 case ACPI_TYPE_STRING: 739 740 value = temp_desc->string.length; 741 break; 742 743 case ACPI_TYPE_BUFFER: 744 745 /* Buffer arguments may not be evaluated at this point */ 746 747 status = acpi_ds_get_buffer_arguments(temp_desc); 748 value = temp_desc->buffer.length; 749 break; 750 751 case ACPI_TYPE_PACKAGE: 752 753 /* Package arguments may not be evaluated at this point */ 754 755 status = acpi_ds_get_package_arguments(temp_desc); 756 value = temp_desc->package.count; 757 break; 758 759 default: 760 761 ACPI_ERROR((AE_INFO, 762 "Operand must be Buffer/Integer/String/Package - found type %s", 763 acpi_ut_get_type_name(type))); 764 status = AE_AML_OPERAND_TYPE; 765 goto cleanup; 766 } 767 768 if (ACPI_FAILURE(status)) { 769 goto cleanup; 770 } 771 772 /* 773 * Now that we have the size of the object, create a result 774 * object to hold the value 775 */ 776 return_desc = acpi_ut_create_integer_object(value); 777 if (!return_desc) { 778 status = AE_NO_MEMORY; 779 goto cleanup; 780 } 781 break; 782 783 case AML_REF_OF_OP: /* ref_of (source_object) */ 784 785 status = 786 acpi_ex_get_object_reference(operand[0], &return_desc, 787 walk_state); 788 if (ACPI_FAILURE(status)) { 789 goto cleanup; 790 } 791 break; 792 793 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */ 794 795 /* Check for a method local or argument, or standalone String */ 796 797 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) == 798 ACPI_DESC_TYPE_NAMED) { 799 temp_desc = 800 acpi_ns_get_attached_object((struct 801 acpi_namespace_node *) 802 operand[0]); 803 if (temp_desc 804 && ((temp_desc->common.type == ACPI_TYPE_STRING) 805 || (temp_desc->common.type == 806 ACPI_TYPE_LOCAL_REFERENCE))) { 807 operand[0] = temp_desc; 808 acpi_ut_add_reference(temp_desc); 809 } else { 810 status = AE_AML_OPERAND_TYPE; 811 goto cleanup; 812 } 813 } else { 814 switch ((operand[0])->common.type) { 815 case ACPI_TYPE_LOCAL_REFERENCE: 816 /* 817 * This is a deref_of (local_x | arg_x) 818 * 819 * Must resolve/dereference the local/arg reference first 820 */ 821 switch (operand[0]->reference.class) { 822 case ACPI_REFCLASS_LOCAL: 823 case ACPI_REFCLASS_ARG: 824 825 /* Set Operand[0] to the value of the local/arg */ 826 827 status = 828 acpi_ds_method_data_get_value 829 (operand[0]->reference.class, 830 operand[0]->reference.value, 831 walk_state, &temp_desc); 832 if (ACPI_FAILURE(status)) { 833 goto cleanup; 834 } 835 836 /* 837 * Delete our reference to the input object and 838 * point to the object just retrieved 839 */ 840 acpi_ut_remove_reference(operand[0]); 841 operand[0] = temp_desc; 842 break; 843 844 case ACPI_REFCLASS_REFOF: 845 846 /* Get the object to which the reference refers */ 847 848 temp_desc = 849 operand[0]->reference.object; 850 acpi_ut_remove_reference(operand[0]); 851 operand[0] = temp_desc; 852 break; 853 854 default: 855 856 /* Must be an Index op - handled below */ 857 break; 858 } 859 break; 860 861 case ACPI_TYPE_STRING: 862 863 break; 864 865 default: 866 867 status = AE_AML_OPERAND_TYPE; 868 goto cleanup; 869 } 870 } 871 872 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) != 873 ACPI_DESC_TYPE_NAMED) { 874 if ((operand[0])->common.type == ACPI_TYPE_STRING) { 875 /* 876 * This is a deref_of (String). The string is a reference 877 * to a named ACPI object. 878 * 879 * 1) Find the owning Node 880 * 2) Dereference the node to an actual object. Could be a 881 * Field, so we need to resolve the node to a value. 882 */ 883 status = 884 acpi_ns_get_node(walk_state->scope_info-> 885 scope.node, 886 operand[0]->string.pointer, 887 ACPI_NS_SEARCH_PARENT, 888 ACPI_CAST_INDIRECT_PTR 889 (struct 890 acpi_namespace_node, 891 &return_desc)); 892 if (ACPI_FAILURE(status)) { 893 goto cleanup; 894 } 895 896 status = 897 acpi_ex_resolve_node_to_value 898 (ACPI_CAST_INDIRECT_PTR 899 (struct acpi_namespace_node, &return_desc), 900 walk_state); 901 goto cleanup; 902 } 903 } 904 905 /* Operand[0] may have changed from the code above */ 906 907 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) == 908 ACPI_DESC_TYPE_NAMED) { 909 /* 910 * This is a deref_of (object_reference) 911 * Get the actual object from the Node (This is the dereference). 912 * This case may only happen when a local_x or arg_x is 913 * dereferenced above. 914 */ 915 return_desc = acpi_ns_get_attached_object((struct 916 acpi_namespace_node 917 *) 918 operand[0]); 919 acpi_ut_add_reference(return_desc); 920 } else { 921 /* 922 * This must be a reference object produced by either the 923 * Index() or ref_of() operator 924 */ 925 switch (operand[0]->reference.class) { 926 case ACPI_REFCLASS_INDEX: 927 /* 928 * The target type for the Index operator must be 929 * either a Buffer or a Package 930 */ 931 switch (operand[0]->reference.target_type) { 932 case ACPI_TYPE_BUFFER_FIELD: 933 934 temp_desc = 935 operand[0]->reference.object; 936 937 /* 938 * Create a new object that contains one element of the 939 * buffer -- the element pointed to by the index. 940 * 941 * NOTE: index into a buffer is NOT a pointer to a 942 * sub-buffer of the main buffer, it is only a pointer to a 943 * single element (byte) of the buffer! 944 * 945 * Since we are returning the value of the buffer at the 946 * indexed location, we don't need to add an additional 947 * reference to the buffer itself. 948 */ 949 return_desc = 950 acpi_ut_create_integer_object((u64) 951 temp_desc->buffer.pointer[operand[0]->reference.value]); 952 if (!return_desc) { 953 status = AE_NO_MEMORY; 954 goto cleanup; 955 } 956 break; 957 958 case ACPI_TYPE_PACKAGE: 959 /* 960 * Return the referenced element of the package. We must 961 * add another reference to the referenced object, however. 962 */ 963 return_desc = 964 *(operand[0]->reference.where); 965 if (!return_desc) { 966 /* 967 * Element is NULL, do not allow the dereference. 968 * This provides compatibility with other ACPI 969 * implementations. 970 */ 971 return_ACPI_STATUS 972 (AE_AML_UNINITIALIZED_ELEMENT); 973 } 974 975 acpi_ut_add_reference(return_desc); 976 break; 977 978 default: 979 980 ACPI_ERROR((AE_INFO, 981 "Unknown Index TargetType 0x%X in reference object %p", 982 operand[0]->reference. 983 target_type, operand[0])); 984 status = AE_AML_OPERAND_TYPE; 985 goto cleanup; 986 } 987 break; 988 989 case ACPI_REFCLASS_REFOF: 990 991 return_desc = operand[0]->reference.object; 992 993 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) == 994 ACPI_DESC_TYPE_NAMED) { 995 return_desc = 996 acpi_ns_get_attached_object((struct 997 acpi_namespace_node 998 *) 999 return_desc); 1000 if (!return_desc) { 1001 break; 1002 } 1003 1004 /* 1005 * June 2013: 1006 * buffer_fields/field_units require additional resolution 1007 */ 1008 switch (return_desc->common.type) { 1009 case ACPI_TYPE_BUFFER_FIELD: 1010 case ACPI_TYPE_LOCAL_REGION_FIELD: 1011 case ACPI_TYPE_LOCAL_BANK_FIELD: 1012 case ACPI_TYPE_LOCAL_INDEX_FIELD: 1013 1014 status = 1015 acpi_ex_read_data_from_field 1016 (walk_state, return_desc, 1017 &temp_desc); 1018 if (ACPI_FAILURE(status)) { 1019 goto cleanup; 1020 } 1021 1022 return_desc = temp_desc; 1023 break; 1024 1025 default: 1026 1027 /* Add another reference to the object */ 1028 1029 acpi_ut_add_reference 1030 (return_desc); 1031 break; 1032 } 1033 } 1034 break; 1035 1036 default: 1037 1038 ACPI_ERROR((AE_INFO, 1039 "Unknown class in reference(%p) - 0x%2.2X", 1040 operand[0], 1041 operand[0]->reference.class)); 1042 1043 status = AE_TYPE; 1044 goto cleanup; 1045 } 1046 } 1047 break; 1048 1049 default: 1050 1051 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 1052 walk_state->opcode)); 1053 status = AE_AML_BAD_OPCODE; 1054 goto cleanup; 1055 } 1056 1057 cleanup: 1058 1059 /* Delete return object on error */ 1060 1061 if (ACPI_FAILURE(status)) { 1062 acpi_ut_remove_reference(return_desc); 1063 } 1064 1065 /* Save return object on success */ 1066 1067 else { 1068 walk_state->result_obj = return_desc; 1069 } 1070 1071 return_ACPI_STATUS(status); 1072 } 1073