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 /* 332 * The 64-bit ACPI integer can hold 16 4-bit BCD characters 333 * (if table is 32-bit, integer can hold 8 BCD characters) 334 * Convert each 4-bit BCD value 335 */ 336 power_of_ten = 1; 337 return_desc->integer.value = 0; 338 digit = operand[0]->integer.value; 339 340 /* Convert each BCD digit (each is one nybble wide) */ 341 342 for (i = 0; 343 (i < acpi_gbl_integer_nybble_width) && (digit > 0); 344 i++) { 345 346 /* Get the least significant 4-bit BCD digit */ 347 348 temp32 = ((u32) digit) & 0xF; 349 350 /* Check the range of the digit */ 351 352 if (temp32 > 9) { 353 ACPI_ERROR((AE_INFO, 354 "BCD digit too large (not decimal): 0x%X", 355 temp32)); 356 357 status = AE_AML_NUMERIC_OVERFLOW; 358 goto cleanup; 359 } 360 361 /* Sum the digit into the result with the current power of 10 */ 362 363 return_desc->integer.value += 364 (((u64) temp32) * power_of_ten); 365 366 /* Shift to next BCD digit */ 367 368 digit >>= 4; 369 370 /* Next power of 10 */ 371 372 power_of_ten *= 10; 373 } 374 break; 375 376 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */ 377 378 return_desc->integer.value = 0; 379 digit = operand[0]->integer.value; 380 381 /* Each BCD digit is one nybble wide */ 382 383 for (i = 0; 384 (i < acpi_gbl_integer_nybble_width) && (digit > 0); 385 i++) { 386 (void)acpi_ut_short_divide(digit, 10, &digit, 387 &temp32); 388 389 /* 390 * Insert the BCD digit that resides in the 391 * remainder from above 392 */ 393 return_desc->integer.value |= 394 (((u64) temp32) << ACPI_MUL_4(i)); 395 } 396 397 /* Overflow if there is any data left in Digit */ 398 399 if (digit > 0) { 400 ACPI_ERROR((AE_INFO, 401 "Integer too large to convert to BCD: 0x%8.8X%8.8X", 402 ACPI_FORMAT_UINT64(operand[0]-> 403 integer.value))); 404 status = AE_AML_NUMERIC_OVERFLOW; 405 goto cleanup; 406 } 407 break; 408 409 case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */ 410 411 /* 412 * This op is a little strange because the internal return value is 413 * different than the return value stored in the result descriptor 414 * (There are really two return values) 415 */ 416 if ((struct acpi_namespace_node *)operand[0] == 417 acpi_gbl_root_node) { 418 /* 419 * This means that the object does not exist in the namespace, 420 * return FALSE 421 */ 422 return_desc->integer.value = 0; 423 goto cleanup; 424 } 425 426 /* Get the object reference, store it, and remove our reference */ 427 428 status = acpi_ex_get_object_reference(operand[0], 429 &return_desc2, 430 walk_state); 431 if (ACPI_FAILURE(status)) { 432 goto cleanup; 433 } 434 435 status = 436 acpi_ex_store(return_desc2, operand[1], walk_state); 437 acpi_ut_remove_reference(return_desc2); 438 439 /* The object exists in the namespace, return TRUE */ 440 441 return_desc->integer.value = ACPI_UINT64_MAX; 442 goto cleanup; 443 444 default: 445 /* No other opcodes get here */ 446 break; 447 } 448 break; 449 450 case AML_STORE_OP: /* Store (Source, Target) */ 451 452 /* 453 * A store operand is typically a number, string, buffer or lvalue 454 * Be careful about deleting the source object, 455 * since the object itself may have been stored. 456 */ 457 status = acpi_ex_store(operand[0], operand[1], walk_state); 458 if (ACPI_FAILURE(status)) { 459 return_ACPI_STATUS(status); 460 } 461 462 /* It is possible that the Store already produced a return object */ 463 464 if (!walk_state->result_obj) { 465 /* 466 * Normally, we would remove a reference on the Operand[0] 467 * parameter; But since it is being used as the internal return 468 * object (meaning we would normally increment it), the two 469 * cancel out, and we simply don't do anything. 470 */ 471 walk_state->result_obj = operand[0]; 472 walk_state->operands[0] = NULL; /* Prevent deletion */ 473 } 474 return_ACPI_STATUS(status); 475 476 /* 477 * ACPI 2.0 Opcodes 478 */ 479 case AML_COPY_OP: /* Copy (Source, Target) */ 480 481 status = 482 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc, 483 walk_state); 484 break; 485 486 case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */ 487 488 status = acpi_ex_convert_to_string(operand[0], &return_desc, 489 ACPI_EXPLICIT_CONVERT_DECIMAL); 490 if (return_desc == operand[0]) { 491 492 /* No conversion performed, add ref to handle return value */ 493 acpi_ut_add_reference(return_desc); 494 } 495 break; 496 497 case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */ 498 499 status = acpi_ex_convert_to_string(operand[0], &return_desc, 500 ACPI_EXPLICIT_CONVERT_HEX); 501 if (return_desc == operand[0]) { 502 503 /* No conversion performed, add ref to handle return value */ 504 acpi_ut_add_reference(return_desc); 505 } 506 break; 507 508 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */ 509 510 status = acpi_ex_convert_to_buffer(operand[0], &return_desc); 511 if (return_desc == operand[0]) { 512 513 /* No conversion performed, add ref to handle return value */ 514 acpi_ut_add_reference(return_desc); 515 } 516 break; 517 518 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */ 519 520 status = acpi_ex_convert_to_integer(operand[0], &return_desc, 521 ACPI_ANY_BASE); 522 if (return_desc == operand[0]) { 523 524 /* No conversion performed, add ref to handle return value */ 525 acpi_ut_add_reference(return_desc); 526 } 527 break; 528 529 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */ 530 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */ 531 532 /* These are two obsolete opcodes */ 533 534 ACPI_ERROR((AE_INFO, 535 "%s is obsolete and not implemented", 536 acpi_ps_get_opcode_name(walk_state->opcode))); 537 status = AE_SUPPORT; 538 goto cleanup; 539 540 default: /* Unknown opcode */ 541 542 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 543 walk_state->opcode)); 544 status = AE_AML_BAD_OPCODE; 545 goto cleanup; 546 } 547 548 if (ACPI_SUCCESS(status)) { 549 550 /* Store the return value computed above into the target object */ 551 552 status = acpi_ex_store(return_desc, operand[1], walk_state); 553 } 554 555 cleanup: 556 557 /* Delete return object on error */ 558 559 if (ACPI_FAILURE(status)) { 560 acpi_ut_remove_reference(return_desc); 561 } 562 563 /* Save return object on success */ 564 565 else if (!walk_state->result_obj) { 566 walk_state->result_obj = return_desc; 567 } 568 569 return_ACPI_STATUS(status); 570 } 571 572 /******************************************************************************* 573 * 574 * FUNCTION: acpi_ex_opcode_1A_0T_1R 575 * 576 * PARAMETERS: walk_state - Current state (contains AML opcode) 577 * 578 * RETURN: Status 579 * 580 * DESCRIPTION: Execute opcode with one argument, no target, and a return value 581 * 582 ******************************************************************************/ 583 584 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state) 585 { 586 union acpi_operand_object **operand = &walk_state->operands[0]; 587 union acpi_operand_object *temp_desc; 588 union acpi_operand_object *return_desc = NULL; 589 acpi_status status = AE_OK; 590 u32 type; 591 u64 value; 592 593 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R, 594 acpi_ps_get_opcode_name(walk_state->opcode)); 595 596 /* Examine the AML opcode */ 597 598 switch (walk_state->opcode) { 599 case AML_LNOT_OP: /* LNot (Operand) */ 600 601 return_desc = acpi_ut_create_integer_object((u64) 0); 602 if (!return_desc) { 603 status = AE_NO_MEMORY; 604 goto cleanup; 605 } 606 607 /* 608 * Set result to ONES (TRUE) if Value == 0. Note: 609 * return_desc->Integer.Value is initially == 0 (FALSE) from above. 610 */ 611 if (!operand[0]->integer.value) { 612 return_desc->integer.value = ACPI_UINT64_MAX; 613 } 614 break; 615 616 case AML_DECREMENT_OP: /* Decrement (Operand) */ 617 case AML_INCREMENT_OP: /* Increment (Operand) */ 618 619 /* 620 * Create a new integer. Can't just get the base integer and 621 * increment it because it may be an Arg or Field. 622 */ 623 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); 624 if (!return_desc) { 625 status = AE_NO_MEMORY; 626 goto cleanup; 627 } 628 629 /* 630 * Since we are expecting a Reference operand, it can be either a 631 * NS Node or an internal object. 632 */ 633 temp_desc = operand[0]; 634 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) == 635 ACPI_DESC_TYPE_OPERAND) { 636 637 /* Internal reference object - prevent deletion */ 638 639 acpi_ut_add_reference(temp_desc); 640 } 641 642 /* 643 * Convert the Reference operand to an Integer (This removes a 644 * reference on the Operand[0] object) 645 * 646 * NOTE: We use LNOT_OP here in order to force resolution of the 647 * reference operand to an actual integer. 648 */ 649 status = 650 acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc, 651 walk_state); 652 if (ACPI_FAILURE(status)) { 653 ACPI_EXCEPTION((AE_INFO, status, 654 "While resolving operands for [%s]", 655 acpi_ps_get_opcode_name(walk_state-> 656 opcode))); 657 658 goto cleanup; 659 } 660 661 /* 662 * temp_desc is now guaranteed to be an Integer object -- 663 * Perform the actual increment or decrement 664 */ 665 if (walk_state->opcode == AML_INCREMENT_OP) { 666 return_desc->integer.value = 667 temp_desc->integer.value + 1; 668 } else { 669 return_desc->integer.value = 670 temp_desc->integer.value - 1; 671 } 672 673 /* Finished with this Integer object */ 674 675 acpi_ut_remove_reference(temp_desc); 676 677 /* 678 * Store the result back (indirectly) through the original 679 * Reference object 680 */ 681 status = acpi_ex_store(return_desc, operand[0], walk_state); 682 break; 683 684 case AML_TYPE_OP: /* object_type (source_object) */ 685 686 /* 687 * Note: The operand is not resolved at this point because we want to 688 * get the associated object, not its value. For example, we don't 689 * want to resolve a field_unit to its value, we want the actual 690 * field_unit object. 691 */ 692 693 /* Get the type of the base object */ 694 695 status = 696 acpi_ex_resolve_multiple(walk_state, operand[0], &type, 697 NULL); 698 if (ACPI_FAILURE(status)) { 699 goto cleanup; 700 } 701 702 /* Allocate a descriptor to hold the type. */ 703 704 return_desc = acpi_ut_create_integer_object((u64) type); 705 if (!return_desc) { 706 status = AE_NO_MEMORY; 707 goto cleanup; 708 } 709 break; 710 711 case AML_SIZE_OF_OP: /* size_of (source_object) */ 712 713 /* 714 * Note: The operand is not resolved at this point because we want to 715 * get the associated object, not its value. 716 */ 717 718 /* Get the base object */ 719 720 status = acpi_ex_resolve_multiple(walk_state, 721 operand[0], &type, 722 &temp_desc); 723 if (ACPI_FAILURE(status)) { 724 goto cleanup; 725 } 726 727 /* 728 * The type of the base object must be integer, buffer, string, or 729 * package. All others are not supported. 730 * 731 * NOTE: Integer is not specifically supported by the ACPI spec, 732 * but is supported implicitly via implicit operand conversion. 733 * rather than bother with conversion, we just use the byte width 734 * global (4 or 8 bytes). 735 */ 736 switch (type) { 737 case ACPI_TYPE_INTEGER: 738 value = acpi_gbl_integer_byte_width; 739 break; 740 741 case ACPI_TYPE_STRING: 742 value = temp_desc->string.length; 743 break; 744 745 case ACPI_TYPE_BUFFER: 746 747 /* Buffer arguments may not be evaluated at this point */ 748 749 status = acpi_ds_get_buffer_arguments(temp_desc); 750 value = temp_desc->buffer.length; 751 break; 752 753 case ACPI_TYPE_PACKAGE: 754 755 /* Package arguments may not be evaluated at this point */ 756 757 status = acpi_ds_get_package_arguments(temp_desc); 758 value = temp_desc->package.count; 759 break; 760 761 default: 762 ACPI_ERROR((AE_INFO, 763 "Operand must be Buffer/Integer/String/Package - found type %s", 764 acpi_ut_get_type_name(type))); 765 status = AE_AML_OPERAND_TYPE; 766 goto cleanup; 767 } 768 769 if (ACPI_FAILURE(status)) { 770 goto cleanup; 771 } 772 773 /* 774 * Now that we have the size of the object, create a result 775 * object to hold the value 776 */ 777 return_desc = acpi_ut_create_integer_object(value); 778 if (!return_desc) { 779 status = AE_NO_MEMORY; 780 goto cleanup; 781 } 782 break; 783 784 case AML_REF_OF_OP: /* ref_of (source_object) */ 785 786 status = 787 acpi_ex_get_object_reference(operand[0], &return_desc, 788 walk_state); 789 if (ACPI_FAILURE(status)) { 790 goto cleanup; 791 } 792 break; 793 794 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */ 795 796 /* Check for a method local or argument, or standalone String */ 797 798 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) == 799 ACPI_DESC_TYPE_NAMED) { 800 temp_desc = 801 acpi_ns_get_attached_object((struct 802 acpi_namespace_node *) 803 operand[0]); 804 if (temp_desc 805 && ((temp_desc->common.type == ACPI_TYPE_STRING) 806 || (temp_desc->common.type == 807 ACPI_TYPE_LOCAL_REFERENCE))) { 808 operand[0] = temp_desc; 809 acpi_ut_add_reference(temp_desc); 810 } else { 811 status = AE_AML_OPERAND_TYPE; 812 goto cleanup; 813 } 814 } else { 815 switch ((operand[0])->common.type) { 816 case ACPI_TYPE_LOCAL_REFERENCE: 817 /* 818 * This is a deref_of (local_x | arg_x) 819 * 820 * Must resolve/dereference the local/arg reference first 821 */ 822 switch (operand[0]->reference.class) { 823 case ACPI_REFCLASS_LOCAL: 824 case ACPI_REFCLASS_ARG: 825 826 /* Set Operand[0] to the value of the local/arg */ 827 828 status = 829 acpi_ds_method_data_get_value 830 (operand[0]->reference.class, 831 operand[0]->reference.value, 832 walk_state, &temp_desc); 833 if (ACPI_FAILURE(status)) { 834 goto cleanup; 835 } 836 837 /* 838 * Delete our reference to the input object and 839 * point to the object just retrieved 840 */ 841 acpi_ut_remove_reference(operand[0]); 842 operand[0] = temp_desc; 843 break; 844 845 case ACPI_REFCLASS_REFOF: 846 847 /* Get the object to which the reference refers */ 848 849 temp_desc = 850 operand[0]->reference.object; 851 acpi_ut_remove_reference(operand[0]); 852 operand[0] = temp_desc; 853 break; 854 855 default: 856 857 /* Must be an Index op - handled below */ 858 break; 859 } 860 break; 861 862 case ACPI_TYPE_STRING: 863 break; 864 865 default: 866 status = AE_AML_OPERAND_TYPE; 867 goto cleanup; 868 } 869 } 870 871 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) != 872 ACPI_DESC_TYPE_NAMED) { 873 if ((operand[0])->common.type == ACPI_TYPE_STRING) { 874 /* 875 * This is a deref_of (String). The string is a reference 876 * to a named ACPI object. 877 * 878 * 1) Find the owning Node 879 * 2) Dereference the node to an actual object. Could be a 880 * Field, so we need to resolve the node to a value. 881 */ 882 status = 883 acpi_ns_get_node(walk_state->scope_info-> 884 scope.node, 885 operand[0]->string.pointer, 886 ACPI_NS_SEARCH_PARENT, 887 ACPI_CAST_INDIRECT_PTR 888 (struct 889 acpi_namespace_node, 890 &return_desc)); 891 if (ACPI_FAILURE(status)) { 892 goto cleanup; 893 } 894 895 status = 896 acpi_ex_resolve_node_to_value 897 (ACPI_CAST_INDIRECT_PTR 898 (struct acpi_namespace_node, &return_desc), 899 walk_state); 900 goto cleanup; 901 } 902 } 903 904 /* Operand[0] may have changed from the code above */ 905 906 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) == 907 ACPI_DESC_TYPE_NAMED) { 908 /* 909 * This is a deref_of (object_reference) 910 * Get the actual object from the Node (This is the dereference). 911 * This case may only happen when a local_x or arg_x is 912 * dereferenced above. 913 */ 914 return_desc = acpi_ns_get_attached_object((struct 915 acpi_namespace_node 916 *) 917 operand[0]); 918 acpi_ut_add_reference(return_desc); 919 } else { 920 /* 921 * This must be a reference object produced by either the 922 * Index() or ref_of() operator 923 */ 924 switch (operand[0]->reference.class) { 925 case ACPI_REFCLASS_INDEX: 926 927 /* 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 /* 961 * Return the referenced element of the package. We must 962 * add another reference to the referenced object, however. 963 */ 964 return_desc = 965 *(operand[0]->reference.where); 966 if (return_desc) { 967 acpi_ut_add_reference 968 (return_desc); 969 } 970 break; 971 972 default: 973 974 ACPI_ERROR((AE_INFO, 975 "Unknown Index TargetType 0x%X in reference object %p", 976 operand[0]->reference. 977 target_type, operand[0])); 978 status = AE_AML_OPERAND_TYPE; 979 goto cleanup; 980 } 981 break; 982 983 case ACPI_REFCLASS_REFOF: 984 985 return_desc = operand[0]->reference.object; 986 987 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) == 988 ACPI_DESC_TYPE_NAMED) { 989 return_desc = 990 acpi_ns_get_attached_object((struct 991 acpi_namespace_node 992 *) 993 return_desc); 994 } 995 996 /* Add another reference to the object! */ 997 998 acpi_ut_add_reference(return_desc); 999 break; 1000 1001 default: 1002 ACPI_ERROR((AE_INFO, 1003 "Unknown class in reference(%p) - 0x%2.2X", 1004 operand[0], 1005 operand[0]->reference.class)); 1006 1007 status = AE_TYPE; 1008 goto cleanup; 1009 } 1010 } 1011 break; 1012 1013 default: 1014 1015 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", 1016 walk_state->opcode)); 1017 status = AE_AML_BAD_OPCODE; 1018 goto cleanup; 1019 } 1020 1021 cleanup: 1022 1023 /* Delete return object on error */ 1024 1025 if (ACPI_FAILURE(status)) { 1026 acpi_ut_remove_reference(return_desc); 1027 } 1028 1029 /* Save return object on success */ 1030 1031 else { 1032 walk_state->result_obj = return_desc; 1033 } 1034 1035 return_ACPI_STATUS(status); 1036 } 1037