1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
4 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
6 * Copyright (C) 2000 - 2023, Intel Corp.
8 *****************************************************************************/
10 #include <acpi/acpi.h>
18 #define _COMPONENT ACPI_EXECUTER
19 ACPI_MODULE_NAME("exoparg1")
22 * Naming convention for AML interpreter execution routines.
24 * The routines that begin execution of AML opcodes are named with a common
25 * convention based upon the number of arguments, the number of target operands,
26 * and whether or not a value is returned:
28 * AcpiExOpcode_xA_yT_zR
32 * xA - ARGUMENTS: The number of arguments (input operands) that are
33 * required for this opcode type (0 through 6 args).
34 * yT - TARGETS: The number of targets (output operands) that are required
35 * for this opcode type (0, 1, or 2 targets).
36 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
37 * as the function return (0 or 1).
39 * The AcpiExOpcode* functions are called via the Dispatcher component with
40 * fully resolved operands.
42 /*******************************************************************************
44 * FUNCTION: acpi_ex_opcode_0A_0T_1R
46 * PARAMETERS: walk_state - Current state (contains AML opcode)
50 * DESCRIPTION: Execute operator with no operands, one return value
52 ******************************************************************************/
53 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
55 acpi_status status = AE_OK;
56 union acpi_operand_object *return_desc = NULL;
58 ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
59 acpi_ps_get_opcode_name(walk_state->opcode));
61 /* Examine the AML opcode */
63 switch (walk_state->opcode) {
64 case AML_TIMER_OP: /* Timer () */
66 /* Create a return object of type Integer */
69 acpi_ut_create_integer_object(acpi_os_get_timer());
71 status = AE_NO_MEMORY;
76 default: /* Unknown opcode */
78 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
80 status = AE_AML_BAD_OPCODE;
86 /* Delete return object on error */
88 if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
89 acpi_ut_remove_reference(return_desc);
90 walk_state->result_obj = NULL;
92 /* Save the return value */
94 walk_state->result_obj = return_desc;
97 return_ACPI_STATUS(status);
100 /*******************************************************************************
102 * FUNCTION: acpi_ex_opcode_1A_0T_0R
104 * PARAMETERS: walk_state - Current state (contains AML opcode)
108 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
111 ******************************************************************************/
113 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
115 union acpi_operand_object **operand = &walk_state->operands[0];
116 acpi_status status = AE_OK;
118 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
119 acpi_ps_get_opcode_name(walk_state->opcode));
121 /* Examine the AML opcode */
123 switch (walk_state->opcode) {
124 case AML_RELEASE_OP: /* Release (mutex_object) */
126 status = acpi_ex_release_mutex(operand[0], walk_state);
129 case AML_RESET_OP: /* Reset (event_object) */
131 status = acpi_ex_system_reset_event(operand[0]);
134 case AML_SIGNAL_OP: /* Signal (event_object) */
136 status = acpi_ex_system_signal_event(operand[0]);
139 case AML_SLEEP_OP: /* Sleep (msec_time) */
141 status = acpi_ex_system_do_sleep(operand[0]->integer.value);
144 case AML_STALL_OP: /* Stall (usec_time) */
147 acpi_ex_system_do_stall((u32) operand[0]->integer.value);
150 case AML_UNLOAD_OP: /* Unload (Handle) */
152 status = acpi_ex_unload_table(operand[0]);
155 default: /* Unknown opcode */
157 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
158 walk_state->opcode));
159 status = AE_AML_BAD_OPCODE;
163 return_ACPI_STATUS(status);
166 #ifdef _OBSOLETE_CODE /* Was originally used for Load() operator */
167 /*******************************************************************************
169 * FUNCTION: acpi_ex_opcode_1A_1T_0R
171 * PARAMETERS: walk_state - Current state (contains AML opcode)
175 * DESCRIPTION: Execute opcode with one argument, one target, and no
178 ******************************************************************************/
180 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
182 acpi_status status = AE_OK;
183 union acpi_operand_object **operand = &walk_state->operands[0];
185 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
186 acpi_ps_get_opcode_name(walk_state->opcode));
188 /* Examine the AML opcode */
190 switch (walk_state->opcode) {
191 #ifdef _OBSOLETE_CODE
194 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
198 default: /* Unknown opcode */
200 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
201 walk_state->opcode));
202 status = AE_AML_BAD_OPCODE;
208 return_ACPI_STATUS(status);
212 /*******************************************************************************
214 * FUNCTION: acpi_ex_opcode_1A_1T_1R
216 * PARAMETERS: walk_state - Current state (contains AML opcode)
220 * DESCRIPTION: Execute opcode with one argument, one target, and a
222 * January 2022: Added Load operator, with new ACPI 6.4
225 ******************************************************************************/
227 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
229 acpi_status status = AE_OK;
230 union acpi_operand_object **operand = &walk_state->operands[0];
231 union acpi_operand_object *return_desc = NULL;
232 union acpi_operand_object *return_desc2 = NULL;
238 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
239 acpi_ps_get_opcode_name(walk_state->opcode));
241 /* Examine the AML opcode */
243 switch (walk_state->opcode) {
245 case AML_FIND_SET_LEFT_BIT_OP:
246 case AML_FIND_SET_RIGHT_BIT_OP:
247 case AML_FROM_BCD_OP:
250 case AML_CONDITIONAL_REF_OF_OP:
252 /* Create a return object of type Integer for these opcodes */
254 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
256 status = AE_NO_MEMORY;
260 switch (walk_state->opcode) {
261 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
263 return_desc->integer.value = ~operand[0]->integer.value;
266 case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */
268 return_desc->integer.value = operand[0]->integer.value;
271 * Acpi specification describes Integer type as a little
272 * endian unsigned value, so this boundary condition is valid.
274 for (temp32 = 0; return_desc->integer.value &&
275 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
276 return_desc->integer.value >>= 1;
279 return_desc->integer.value = temp32;
282 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
284 return_desc->integer.value = operand[0]->integer.value;
287 * The Acpi specification describes Integer type as a little
288 * endian unsigned value, so this boundary condition is valid.
290 for (temp32 = 0; return_desc->integer.value &&
291 temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
292 return_desc->integer.value <<= 1;
295 /* Since the bit position is one-based, subtract from 33 (65) */
297 return_desc->integer.value =
299 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
302 case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */
304 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
305 * (if table is 32-bit, integer can hold 8 BCD characters)
306 * Convert each 4-bit BCD value
309 return_desc->integer.value = 0;
310 digit = operand[0]->integer.value;
312 /* Convert each BCD digit (each is one nybble wide) */
315 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
318 /* Get the least significant 4-bit BCD digit */
320 temp32 = ((u32) digit) & 0xF;
322 /* Check the range of the digit */
326 "BCD digit too large (not decimal): 0x%X",
329 status = AE_AML_NUMERIC_OVERFLOW;
333 /* Sum the digit into the result with the current power of 10 */
335 return_desc->integer.value +=
336 (((u64) temp32) * power_of_ten);
338 /* Shift to next BCD digit */
342 /* Next power of 10 */
348 case AML_LOAD_OP: /* Result1 = Load (Operand[0], Result1) */
350 return_desc->integer.value = 0;
352 acpi_ex_load_op(operand[0], return_desc,
354 if (ACPI_SUCCESS(status)) {
356 /* Return -1 (non-zero) indicates success */
358 return_desc->integer.value = 0xFFFFFFFFFFFFFFFF;
362 case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */
364 return_desc->integer.value = 0;
365 digit = operand[0]->integer.value;
367 /* Each BCD digit is one nybble wide */
370 (i < acpi_gbl_integer_nybble_width) && (digit > 0);
372 (void)acpi_ut_short_divide(digit, 10, &digit,
376 * Insert the BCD digit that resides in the
377 * remainder from above
379 return_desc->integer.value |=
380 (((u64) temp32) << ACPI_MUL_4(i));
383 /* Overflow if there is any data left in Digit */
387 "Integer too large to convert to BCD: 0x%8.8X%8.8X",
388 ACPI_FORMAT_UINT64(operand[0]->
390 status = AE_AML_NUMERIC_OVERFLOW;
395 case AML_CONDITIONAL_REF_OF_OP: /* cond_ref_of (source_object, Result) */
397 * This op is a little strange because the internal return value is
398 * different than the return value stored in the result descriptor
399 * (There are really two return values)
401 if ((struct acpi_namespace_node *)operand[0] ==
402 acpi_gbl_root_node) {
404 * This means that the object does not exist in the namespace,
407 return_desc->integer.value = 0;
411 /* Get the object reference, store it, and remove our reference */
413 status = acpi_ex_get_object_reference(operand[0],
416 if (ACPI_FAILURE(status)) {
421 acpi_ex_store(return_desc2, operand[1], walk_state);
422 acpi_ut_remove_reference(return_desc2);
424 /* The object exists in the namespace, return TRUE */
426 return_desc->integer.value = ACPI_UINT64_MAX;
431 /* No other opcodes get here */
437 case AML_STORE_OP: /* Store (Source, Target) */
439 * A store operand is typically a number, string, buffer or lvalue
440 * Be careful about deleting the source object,
441 * since the object itself may have been stored.
443 status = acpi_ex_store(operand[0], operand[1], walk_state);
444 if (ACPI_FAILURE(status)) {
445 return_ACPI_STATUS(status);
448 /* It is possible that the Store already produced a return object */
450 if (!walk_state->result_obj) {
452 * Normally, we would remove a reference on the Operand[0]
453 * parameter; But since it is being used as the internal return
454 * object (meaning we would normally increment it), the two
455 * cancel out, and we simply don't do anything.
457 walk_state->result_obj = operand[0];
458 walk_state->operands[0] = NULL; /* Prevent deletion */
460 return_ACPI_STATUS(status);
465 case AML_COPY_OBJECT_OP: /* copy_object (Source, Target) */
468 acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
472 case AML_TO_DECIMAL_STRING_OP: /* to_decimal_string (Data, Result) */
475 acpi_ex_convert_to_string(operand[0], &return_desc,
476 ACPI_EXPLICIT_CONVERT_DECIMAL);
477 if (return_desc == operand[0]) {
479 /* No conversion performed, add ref to handle return value */
481 acpi_ut_add_reference(return_desc);
485 case AML_TO_HEX_STRING_OP: /* to_hex_string (Data, Result) */
488 acpi_ex_convert_to_string(operand[0], &return_desc,
489 ACPI_EXPLICIT_CONVERT_HEX);
490 if (return_desc == operand[0]) {
492 /* No conversion performed, add ref to handle return value */
494 acpi_ut_add_reference(return_desc);
498 case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */
500 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
501 if (return_desc == operand[0]) {
503 /* No conversion performed, add ref to handle return value */
505 acpi_ut_add_reference(return_desc);
509 case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
511 /* Perform "explicit" conversion */
514 acpi_ex_convert_to_integer(operand[0], &return_desc, 0);
515 if (return_desc == operand[0]) {
517 /* No conversion performed, add ref to handle return value */
519 acpi_ut_add_reference(return_desc);
523 case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */
524 case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */
526 /* These are two obsolete opcodes */
529 "%s is obsolete and not implemented",
530 acpi_ps_get_opcode_name(walk_state->opcode)));
534 default: /* Unknown opcode */
536 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
537 walk_state->opcode));
538 status = AE_AML_BAD_OPCODE;
542 if (ACPI_SUCCESS(status)) {
544 /* Store the return value computed above into the target object */
546 status = acpi_ex_store(return_desc, operand[1], walk_state);
551 /* Delete return object on error */
553 if (ACPI_FAILURE(status)) {
554 acpi_ut_remove_reference(return_desc);
557 /* Save return object on success */
559 else if (!walk_state->result_obj) {
560 walk_state->result_obj = return_desc;
563 return_ACPI_STATUS(status);
566 /*******************************************************************************
568 * FUNCTION: acpi_ex_opcode_1A_0T_1R
570 * PARAMETERS: walk_state - Current state (contains AML opcode)
574 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
576 ******************************************************************************/
578 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
580 union acpi_operand_object **operand = &walk_state->operands[0];
581 union acpi_operand_object *temp_desc;
582 union acpi_operand_object *return_desc = NULL;
583 acpi_status status = AE_OK;
587 ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
588 acpi_ps_get_opcode_name(walk_state->opcode));
590 /* Examine the AML opcode */
592 switch (walk_state->opcode) {
593 case AML_LOGICAL_NOT_OP: /* LNot (Operand) */
595 return_desc = acpi_ut_create_integer_object((u64) 0);
597 status = AE_NO_MEMORY;
602 * Set result to ONES (TRUE) if Value == 0. Note:
603 * return_desc->Integer.Value is initially == 0 (FALSE) from above.
605 if (!operand[0]->integer.value) {
606 return_desc->integer.value = ACPI_UINT64_MAX;
610 case AML_DECREMENT_OP: /* Decrement (Operand) */
611 case AML_INCREMENT_OP: /* Increment (Operand) */
613 * Create a new integer. Can't just get the base integer and
614 * increment it because it may be an Arg or Field.
616 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
618 status = AE_NO_MEMORY;
623 * Since we are expecting a Reference operand, it can be either a
624 * NS Node or an internal object.
626 temp_desc = operand[0];
627 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
628 ACPI_DESC_TYPE_OPERAND) {
630 /* Internal reference object - prevent deletion */
632 acpi_ut_add_reference(temp_desc);
636 * Convert the Reference operand to an Integer (This removes a
637 * reference on the Operand[0] object)
639 * NOTE: We use LNOT_OP here in order to force resolution of the
640 * reference operand to an actual integer.
642 status = acpi_ex_resolve_operands(AML_LOGICAL_NOT_OP,
643 &temp_desc, walk_state);
644 if (ACPI_FAILURE(status)) {
645 ACPI_EXCEPTION((AE_INFO, status,
646 "While resolving operands for [%s]",
647 acpi_ps_get_opcode_name(walk_state->
654 * temp_desc is now guaranteed to be an Integer object --
655 * Perform the actual increment or decrement
657 if (walk_state->opcode == AML_INCREMENT_OP) {
658 return_desc->integer.value =
659 temp_desc->integer.value + 1;
661 return_desc->integer.value =
662 temp_desc->integer.value - 1;
665 /* Finished with this Integer object */
667 acpi_ut_remove_reference(temp_desc);
670 * Store the result back (indirectly) through the original
673 status = acpi_ex_store(return_desc, operand[0], walk_state);
676 case AML_OBJECT_TYPE_OP: /* object_type (source_object) */
678 * Note: The operand is not resolved at this point because we want to
679 * get the associated object, not its value. For example, we don't
680 * want to resolve a field_unit to its value, we want the actual
684 /* Get the type of the base object */
687 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
689 if (ACPI_FAILURE(status)) {
693 /* Allocate a descriptor to hold the type. */
695 return_desc = acpi_ut_create_integer_object((u64) type);
697 status = AE_NO_MEMORY;
702 case AML_SIZE_OF_OP: /* size_of (source_object) */
704 * Note: The operand is not resolved at this point because we want to
705 * get the associated object, not its value.
708 /* Get the base object */
711 acpi_ex_resolve_multiple(walk_state, operand[0], &type,
713 if (ACPI_FAILURE(status)) {
718 * The type of the base object must be integer, buffer, string, or
719 * package. All others are not supported.
721 * NOTE: Integer is not specifically supported by the ACPI spec,
722 * but is supported implicitly via implicit operand conversion.
723 * rather than bother with conversion, we just use the byte width
724 * global (4 or 8 bytes).
727 case ACPI_TYPE_INTEGER:
729 value = acpi_gbl_integer_byte_width;
732 case ACPI_TYPE_STRING:
734 value = temp_desc->string.length;
737 case ACPI_TYPE_BUFFER:
739 /* Buffer arguments may not be evaluated at this point */
741 status = acpi_ds_get_buffer_arguments(temp_desc);
742 value = temp_desc->buffer.length;
745 case ACPI_TYPE_PACKAGE:
747 /* Package arguments may not be evaluated at this point */
749 status = acpi_ds_get_package_arguments(temp_desc);
750 value = temp_desc->package.count;
756 "Operand must be Buffer/Integer/String/Package"
758 acpi_ut_get_type_name(type)));
760 status = AE_AML_OPERAND_TYPE;
764 if (ACPI_FAILURE(status)) {
769 * Now that we have the size of the object, create a result
770 * object to hold the value
772 return_desc = acpi_ut_create_integer_object(value);
774 status = AE_NO_MEMORY;
779 case AML_REF_OF_OP: /* ref_of (source_object) */
782 acpi_ex_get_object_reference(operand[0], &return_desc,
784 if (ACPI_FAILURE(status)) {
789 case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */
791 /* Check for a method local or argument, or standalone String */
793 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
794 ACPI_DESC_TYPE_NAMED) {
796 acpi_ns_get_attached_object((struct
797 acpi_namespace_node *)
800 && ((temp_desc->common.type == ACPI_TYPE_STRING)
801 || (temp_desc->common.type ==
802 ACPI_TYPE_LOCAL_REFERENCE))) {
803 operand[0] = temp_desc;
804 acpi_ut_add_reference(temp_desc);
806 status = AE_AML_OPERAND_TYPE;
810 switch ((operand[0])->common.type) {
811 case ACPI_TYPE_LOCAL_REFERENCE:
813 * This is a deref_of (local_x | arg_x)
815 * Must resolve/dereference the local/arg reference first
817 switch (operand[0]->reference.class) {
818 case ACPI_REFCLASS_LOCAL:
819 case ACPI_REFCLASS_ARG:
821 /* Set Operand[0] to the value of the local/arg */
824 acpi_ds_method_data_get_value
825 (operand[0]->reference.class,
826 operand[0]->reference.value,
827 walk_state, &temp_desc);
828 if (ACPI_FAILURE(status)) {
833 * Delete our reference to the input object and
834 * point to the object just retrieved
836 acpi_ut_remove_reference(operand[0]);
837 operand[0] = temp_desc;
840 case ACPI_REFCLASS_REFOF:
842 /* Get the object to which the reference refers */
845 operand[0]->reference.object;
846 acpi_ut_remove_reference(operand[0]);
847 operand[0] = temp_desc;
852 /* Must be an Index op - handled below */
857 case ACPI_TYPE_STRING:
863 status = AE_AML_OPERAND_TYPE;
868 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
869 ACPI_DESC_TYPE_NAMED) {
870 if ((operand[0])->common.type == ACPI_TYPE_STRING) {
872 * This is a deref_of (String). The string is a reference
873 * to a named ACPI object.
875 * 1) Find the owning Node
876 * 2) Dereference the node to an actual object. Could be a
877 * Field, so we need to resolve the node to a value.
880 acpi_ns_get_node_unlocked(walk_state->
885 ACPI_NS_SEARCH_PARENT,
886 ACPI_CAST_INDIRECT_PTR
890 if (ACPI_FAILURE(status)) {
895 acpi_ex_resolve_node_to_value
896 (ACPI_CAST_INDIRECT_PTR
897 (struct acpi_namespace_node, &return_desc),
903 /* Operand[0] may have changed from the code above */
905 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
906 ACPI_DESC_TYPE_NAMED) {
908 * This is a deref_of (object_reference)
909 * Get the actual object from the Node (This is the dereference).
910 * This case may only happen when a local_x or arg_x is
911 * dereferenced above, or for references to device and
914 switch (((struct acpi_namespace_node *)operand[0])->
916 case ACPI_TYPE_DEVICE:
917 case ACPI_TYPE_THERMAL:
919 /* These types have no node subobject, return the NS node */
921 return_desc = operand[0];
925 /* For most types, get the object attached to the node */
927 return_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)operand[0]);
928 acpi_ut_add_reference(return_desc);
933 * This must be a reference object produced by either the
934 * Index() or ref_of() operator
936 switch (operand[0]->reference.class) {
937 case ACPI_REFCLASS_INDEX:
939 * The target type for the Index operator must be
940 * either a Buffer or a Package
942 switch (operand[0]->reference.target_type) {
943 case ACPI_TYPE_BUFFER_FIELD:
946 operand[0]->reference.object;
949 * Create a new object that contains one element of the
950 * buffer -- the element pointed to by the index.
952 * NOTE: index into a buffer is NOT a pointer to a
953 * sub-buffer of the main buffer, it is only a pointer to a
954 * single element (byte) of the buffer!
956 * Since we are returning the value of the buffer at the
957 * indexed location, we don't need to add an additional
958 * reference to the buffer itself.
961 acpi_ut_create_integer_object((u64)
962 temp_desc->buffer.pointer[operand[0]->reference.value]);
964 status = AE_NO_MEMORY;
969 case ACPI_TYPE_PACKAGE:
971 * Return the referenced element of the package. We must
972 * add another reference to the referenced object, however.
975 *(operand[0]->reference.where);
978 * Element is NULL, do not allow the dereference.
979 * This provides compatibility with other ACPI
983 (AE_AML_UNINITIALIZED_ELEMENT);
986 acpi_ut_add_reference(return_desc);
992 "Unknown Index TargetType 0x%X in reference object %p",
993 operand[0]->reference.
994 target_type, operand[0]));
996 status = AE_AML_OPERAND_TYPE;
1001 case ACPI_REFCLASS_REFOF:
1003 return_desc = operand[0]->reference.object;
1005 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1006 ACPI_DESC_TYPE_NAMED) {
1008 acpi_ns_get_attached_object((struct
1018 * buffer_fields/field_units require additional resolution
1020 switch (return_desc->common.type) {
1021 case ACPI_TYPE_BUFFER_FIELD:
1022 case ACPI_TYPE_LOCAL_REGION_FIELD:
1023 case ACPI_TYPE_LOCAL_BANK_FIELD:
1024 case ACPI_TYPE_LOCAL_INDEX_FIELD:
1027 acpi_ex_read_data_from_field
1028 (walk_state, return_desc,
1030 if (ACPI_FAILURE(status)) {
1035 return_desc = temp_desc;
1040 /* Add another reference to the object */
1042 acpi_ut_add_reference
1051 ACPI_ERROR((AE_INFO,
1052 "Unknown class in reference(%p) - 0x%2.2X",
1054 operand[0]->reference.class));
1064 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
1065 walk_state->opcode));
1067 status = AE_AML_BAD_OPCODE;
1073 /* Delete return object on error */
1075 if (ACPI_FAILURE(status)) {
1076 acpi_ut_remove_reference(return_desc);
1079 /* Save return object on success */
1082 walk_state->result_obj = return_desc;
1085 return_ACPI_STATUS(status);