| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 1133 | 41.05% | 4 | 6.90% |
| Linus Torvalds | 748 | 27.10% | 4 | 6.90% |
| Robert Moore | 369 | 13.37% | 24 | 41.38% |
| Andy Grover | 335 | 12.14% | 12 | 20.69% |
| Len Brown | 152 | 5.51% | 10 | 17.24% |
| Lin Ming | 20 | 0.72% | 1 | 1.72% |
| Lv Zheng | 1 | 0.04% | 1 | 1.72% |
| Patrick Mochel | 1 | 0.04% | 1 | 1.72% |
| Erik Schmauss | 1 | 0.04% | 1 | 1.72% |
| Total | 2760 | 58 |
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: exoparg1 - AML execution - opcodes with 1 argument * * Copyright (C) 2000 - 2022, Intel Corp. * *****************************************************************************/ #include <acpi/acpi.h> #include "accommon.h" #include "acparser.h" #include "acdispat.h" #include "acinterp.h" #include "amlcode.h" #include "acnamesp.h" #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME("exoparg1") /*! * Naming convention for AML interpreter execution routines. * * The routines that begin execution of AML opcodes are named with a common * convention based upon the number of arguments, the number of target operands, * and whether or not a value is returned: * * AcpiExOpcode_xA_yT_zR * * Where: * * xA - ARGUMENTS: The number of arguments (input operands) that are * required for this opcode type (0 through 6 args). * yT - TARGETS: The number of targets (output operands) that are required * for this opcode type (0, 1, or 2 targets). * zR - RETURN VALUE: Indicates whether this opcode type returns a value * as the function return (0 or 1). * * The AcpiExOpcode* functions are called via the Dispatcher component with * fully resolved operands. !*/ /******************************************************************************* * * FUNCTION: acpi_ex_opcode_0A_0T_1R * * PARAMETERS: walk_state - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute operator with no operands, one return value * ******************************************************************************/ acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state) { acpi_status status = AE_OK; union acpi_operand_object *return_desc = NULL; ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R, acpi_ps_get_opcode_name(walk_state->opcode)); /* Examine the AML opcode */ switch (walk_state->opcode) { case AML_TIMER_OP: /* Timer () */ /* Create a return object of type Integer */ return_desc = acpi_ut_create_integer_object(acpi_os_get_timer()); if (!return_desc) { status = AE_NO_MEMORY; goto cleanup; } break; default: /* Unknown opcode */ ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", walk_state->opcode)); status = AE_AML_BAD_OPCODE; break; } cleanup: /* Delete return object on error */ if ((ACPI_FAILURE(status)) || walk_state->result_obj) { acpi_ut_remove_reference(return_desc); walk_state->result_obj = NULL; } else { /* Save the return value */ walk_state->result_obj = return_desc; } return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ex_opcode_1A_0T_0R * * PARAMETERS: walk_state - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on * object stack * ******************************************************************************/ acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state) { union acpi_operand_object **operand = &walk_state->operands[0]; acpi_status status = AE_OK; ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R, acpi_ps_get_opcode_name(walk_state->opcode)); /* Examine the AML opcode */ switch (walk_state->opcode) { case AML_RELEASE_OP: /* Release (mutex_object) */ status = acpi_ex_release_mutex(operand[0], walk_state); break; case AML_RESET_OP: /* Reset (event_object) */ status = acpi_ex_system_reset_event(operand[0]); break; case AML_SIGNAL_OP: /* Signal (event_object) */ status = acpi_ex_system_signal_event(operand[0]); break; case AML_SLEEP_OP: /* Sleep (msec_time) */ status = acpi_ex_system_do_sleep(operand[0]->integer.value); break; case AML_STALL_OP: /* Stall (usec_time) */ status = acpi_ex_system_do_stall((u32) operand[0]->integer.value); break; case AML_UNLOAD_OP: /* Unload (Handle) */ status = acpi_ex_unload_table(operand[0]); break; default: /* Unknown opcode */ ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", walk_state->opcode)); status = AE_AML_BAD_OPCODE; break; } return_ACPI_STATUS(status); } #ifdef _OBSOLETE_CODE /* Was originally used for Load() operator */ /******************************************************************************* * * FUNCTION: acpi_ex_opcode_1A_1T_0R * * PARAMETERS: walk_state - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute opcode with one argument, one target, and no * return value. * ******************************************************************************/ acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state) { acpi_status status = AE_OK; union acpi_operand_object **operand = &walk_state->operands[0]; ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R, acpi_ps_get_opcode_name(walk_state->opcode)); /* Examine the AML opcode */ switch (walk_state->opcode) { #ifdef _OBSOLETE_CODE case AML_LOAD_OP: status = acpi_ex_load_op(operand[0], operand[1], walk_state); break; #endif default: /* Unknown opcode */ ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", walk_state->opcode)); status = AE_AML_BAD_OPCODE; goto cleanup; } cleanup: return_ACPI_STATUS(status); } #endif /******************************************************************************* * * FUNCTION: acpi_ex_opcode_1A_1T_1R * * PARAMETERS: walk_state - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute opcode with one argument, one target, and a * return value. * January 2022: Added Load operator, with new ACPI 6.4 * semantics. * ******************************************************************************/ acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state) { acpi_status status = AE_OK; union acpi_operand_object **operand = &walk_state->operands[0]; union acpi_operand_object *return_desc = NULL; union acpi_operand_object *return_desc2 = NULL; u32 temp32; u32 i; u64 power_of_ten; u64 digit; ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R, acpi_ps_get_opcode_name(walk_state->opcode)); /* Examine the AML opcode */ switch (walk_state->opcode) { case AML_BIT_NOT_OP: case AML_FIND_SET_LEFT_BIT_OP: case AML_FIND_SET_RIGHT_BIT_OP: case AML_FROM_BCD_OP: case AML_LOAD_OP: case AML_TO_BCD_OP: case AML_CONDITIONAL_REF_OF_OP: /* Create a return object of type Integer for these opcodes */ return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); if (!return_desc) { status = AE_NO_MEMORY; goto cleanup; } switch (walk_state->opcode) { case AML_BIT_NOT_OP: /* Not (Operand, Result) */ return_desc->integer.value = ~operand[0]->integer.value; break; case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */ return_desc->integer.value = operand[0]->integer.value; /* * Acpi specification describes Integer type as a little * endian unsigned value, so this boundary condition is valid. */ for (temp32 = 0; return_desc->integer.value && temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) { return_desc->integer.value >>= 1; } return_desc->integer.value = temp32; break; case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */ return_desc->integer.value = operand[0]->integer.value; /* * The Acpi specification describes Integer type as a little * endian unsigned value, so this boundary condition is valid. */ for (temp32 = 0; return_desc->integer.value && temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) { return_desc->integer.value <<= 1; } /* Since the bit position is one-based, subtract from 33 (65) */ return_desc->integer.value = temp32 == 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32; break; case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */ /* * The 64-bit ACPI integer can hold 16 4-bit BCD characters * (if table is 32-bit, integer can hold 8 BCD characters) * Convert each 4-bit BCD value */ power_of_ten = 1; return_desc->integer.value = 0; digit = operand[0]->integer.value; /* Convert each BCD digit (each is one nybble wide) */ for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) { /* Get the least significant 4-bit BCD digit */ temp32 = ((u32) digit) & 0xF; /* Check the range of the digit */ if (temp32 > 9) { ACPI_ERROR((AE_INFO, "BCD digit too large (not decimal): 0x%X", temp32)); status = AE_AML_NUMERIC_OVERFLOW; goto cleanup; } /* Sum the digit into the result with the current power of 10 */ return_desc->integer.value += (((u64) temp32) * power_of_ten); /* Shift to next BCD digit */ digit >>= 4; /* Next power of 10 */ power_of_ten *= 10; } break; case AML_LOAD_OP: /* Result1 = Load (Operand[0], Result1) */ return_desc->integer.value = 0; status = acpi_ex_load_op(operand[0], return_desc, walk_state); if (ACPI_SUCCESS(status)) { /* Return -1 (non-zero) indicates success */ return_desc->integer.value = 0xFFFFFFFFFFFFFFFF; } break; case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */ return_desc->integer.value = 0; digit = operand[0]->integer.value; /* Each BCD digit is one nybble wide */ for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) { (void)acpi_ut_short_divide(digit, 10, &digit, &temp32); /* * Insert the BCD digit that resides in the * remainder from above */ return_desc->integer.value |= (((u64) temp32) << ACPI_MUL_4(i)); } /* Overflow if there is any data left in Digit */ if (digit > 0) { ACPI_ERROR((AE_INFO, "Integer too large to convert to BCD: 0x%8.8X%8.8X", ACPI_FORMAT_UINT64(operand[0]-> integer.value))); status = AE_AML_NUMERIC_OVERFLOW; goto cleanup; } break; case AML_CONDITIONAL_REF_OF_OP: /* cond_ref_of (source_object, Result) */ /* * This op is a little strange because the internal return value is * different than the return value stored in the result descriptor * (There are really two return values) */ if ((struct acpi_namespace_node *)operand[0] == acpi_gbl_root_node) { /* * This means that the object does not exist in the namespace, * return FALSE */ return_desc->integer.value = 0; goto cleanup; } /* Get the object reference, store it, and remove our reference */ status = acpi_ex_get_object_reference(operand[0], &return_desc2, walk_state); if (ACPI_FAILURE(status)) { goto cleanup; } status = acpi_ex_store(return_desc2, operand[1], walk_state); acpi_ut_remove_reference(return_desc2); /* The object exists in the namespace, return TRUE */ return_desc->integer.value = ACPI_UINT64_MAX; goto cleanup; default: /* No other opcodes get here */ break; } break; case AML_STORE_OP: /* Store (Source, Target) */ /* * A store operand is typically a number, string, buffer or lvalue * Be careful about deleting the source object, * since the object itself may have been stored. */ status = acpi_ex_store(operand[0], operand[1], walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* It is possible that the Store already produced a return object */ if (!walk_state->result_obj) { /* * Normally, we would remove a reference on the Operand[0] * parameter; But since it is being used as the internal return * object (meaning we would normally increment it), the two * cancel out, and we simply don't do anything. */ walk_state->result_obj = operand[0]; walk_state->operands[0] = NULL; /* Prevent deletion */ } return_ACPI_STATUS(status); /* * ACPI 2.0 Opcodes */ case AML_COPY_OBJECT_OP: /* copy_object (Source, Target) */ status = acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc, walk_state); break; case AML_TO_DECIMAL_STRING_OP: /* to_decimal_string (Data, Result) */ status = acpi_ex_convert_to_string(operand[0], &return_desc, ACPI_EXPLICIT_CONVERT_DECIMAL); if (return_desc == operand[0]) { /* No conversion performed, add ref to handle return value */ acpi_ut_add_reference(return_desc); } break; case AML_TO_HEX_STRING_OP: /* to_hex_string (Data, Result) */ status = acpi_ex_convert_to_string(operand[0], &return_desc, ACPI_EXPLICIT_CONVERT_HEX); if (return_desc == operand[0]) { /* No conversion performed, add ref to handle return value */ acpi_ut_add_reference(return_desc); } break; case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */ status = acpi_ex_convert_to_buffer(operand[0], &return_desc); if (return_desc == operand[0]) { /* No conversion performed, add ref to handle return value */ acpi_ut_add_reference(return_desc); } break; case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */ /* Perform "explicit" conversion */ status = acpi_ex_convert_to_integer(operand[0], &return_desc, 0); if (return_desc == operand[0]) { /* No conversion performed, add ref to handle return value */ acpi_ut_add_reference(return_desc); } break; case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */ case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */ /* These are two obsolete opcodes */ ACPI_ERROR((AE_INFO, "%s is obsolete and not implemented", acpi_ps_get_opcode_name(walk_state->opcode))); status = AE_SUPPORT; goto cleanup; default: /* Unknown opcode */ ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", walk_state->opcode)); status = AE_AML_BAD_OPCODE; goto cleanup; } if (ACPI_SUCCESS(status)) { /* Store the return value computed above into the target object */ status = acpi_ex_store(return_desc, operand[1], walk_state); } cleanup: /* Delete return object on error */ if (ACPI_FAILURE(status)) { acpi_ut_remove_reference(return_desc); } /* Save return object on success */ else if (!walk_state->result_obj) { walk_state->result_obj = return_desc; } return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ex_opcode_1A_0T_1R * * PARAMETERS: walk_state - Current state (contains AML opcode) * * RETURN: Status * * DESCRIPTION: Execute opcode with one argument, no target, and a return value * ******************************************************************************/ acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state) { union acpi_operand_object **operand = &walk_state->operands[0]; union acpi_operand_object *temp_desc; union acpi_operand_object *return_desc = NULL; acpi_status status = AE_OK; u32 type; u64 value; ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R, acpi_ps_get_opcode_name(walk_state->opcode)); /* Examine the AML opcode */ switch (walk_state->opcode) { case AML_LOGICAL_NOT_OP: /* LNot (Operand) */ return_desc = acpi_ut_create_integer_object((u64) 0); if (!return_desc) { status = AE_NO_MEMORY; goto cleanup; } /* * Set result to ONES (TRUE) if Value == 0. Note: * return_desc->Integer.Value is initially == 0 (FALSE) from above. */ if (!operand[0]->integer.value) { return_desc->integer.value = ACPI_UINT64_MAX; } break; case AML_DECREMENT_OP: /* Decrement (Operand) */ case AML_INCREMENT_OP: /* Increment (Operand) */ /* * Create a new integer. Can't just get the base integer and * increment it because it may be an Arg or Field. */ return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); if (!return_desc) { status = AE_NO_MEMORY; goto cleanup; } /* * Since we are expecting a Reference operand, it can be either a * NS Node or an internal object. */ temp_desc = operand[0]; if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) == ACPI_DESC_TYPE_OPERAND) { /* Internal reference object - prevent deletion */ acpi_ut_add_reference(temp_desc); } /* * Convert the Reference operand to an Integer (This removes a * reference on the Operand[0] object) * * NOTE: We use LNOT_OP here in order to force resolution of the * reference operand to an actual integer. */ status = acpi_ex_resolve_operands(AML_LOGICAL_NOT_OP, &temp_desc, walk_state); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "While resolving operands for [%s]", acpi_ps_get_opcode_name(walk_state-> opcode))); goto cleanup; } /* * temp_desc is now guaranteed to be an Integer object -- * Perform the actual increment or decrement */ if (walk_state->opcode == AML_INCREMENT_OP) { return_desc->integer.value = temp_desc->integer.value + 1; } else { return_desc->integer.value = temp_desc->integer.value - 1; } /* Finished with this Integer object */ acpi_ut_remove_reference(temp_desc); /* * Store the result back (indirectly) through the original * Reference object */ status = acpi_ex_store(return_desc, operand[0], walk_state); break; case AML_OBJECT_TYPE_OP: /* object_type (source_object) */ /* * Note: The operand is not resolved at this point because we want to * get the associated object, not its value. For example, we don't * want to resolve a field_unit to its value, we want the actual * field_unit object. */ /* Get the type of the base object */ status = acpi_ex_resolve_multiple(walk_state, operand[0], &type, NULL); if (ACPI_FAILURE(status)) { goto cleanup; } /* Allocate a descriptor to hold the type. */ return_desc = acpi_ut_create_integer_object((u64) type); if (!return_desc) { status = AE_NO_MEMORY; goto cleanup; } break; case AML_SIZE_OF_OP: /* size_of (source_object) */ /* * Note: The operand is not resolved at this point because we want to * get the associated object, not its value. */ /* Get the base object */ status = acpi_ex_resolve_multiple(walk_state, operand[0], &type, &temp_desc); if (ACPI_FAILURE(status)) { goto cleanup; } /* * The type of the base object must be integer, buffer, string, or * package. All others are not supported. * * NOTE: Integer is not specifically supported by the ACPI spec, * but is supported implicitly via implicit operand conversion. * rather than bother with conversion, we just use the byte width * global (4 or 8 bytes). */ switch (type) { case ACPI_TYPE_INTEGER: value = acpi_gbl_integer_byte_width; break; case ACPI_TYPE_STRING: value = temp_desc->string.length; break; case ACPI_TYPE_BUFFER: /* Buffer arguments may not be evaluated at this point */ status = acpi_ds_get_buffer_arguments(temp_desc); value = temp_desc->buffer.length; break; case ACPI_TYPE_PACKAGE: /* Package arguments may not be evaluated at this point */ status = acpi_ds_get_package_arguments(temp_desc); value = temp_desc->package.count; break; default: ACPI_ERROR((AE_INFO, "Operand must be Buffer/Integer/String/Package" " - found type %s", acpi_ut_get_type_name(type))); status = AE_AML_OPERAND_TYPE; goto cleanup; } if (ACPI_FAILURE(status)) { goto cleanup; } /* * Now that we have the size of the object, create a result * object to hold the value */ return_desc = acpi_ut_create_integer_object(value); if (!return_desc) { status = AE_NO_MEMORY; goto cleanup; } break; case AML_REF_OF_OP: /* ref_of (source_object) */ status = acpi_ex_get_object_reference(operand[0], &return_desc, walk_state); if (ACPI_FAILURE(status)) { goto cleanup; } break; case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */ /* Check for a method local or argument, or standalone String */ if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) == ACPI_DESC_TYPE_NAMED) { temp_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *) operand[0]); if (temp_desc && ((temp_desc->common.type == ACPI_TYPE_STRING) || (temp_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE))) { operand[0] = temp_desc; acpi_ut_add_reference(temp_desc); } else { status = AE_AML_OPERAND_TYPE; goto cleanup; } } else { switch ((operand[0])->common.type) { case ACPI_TYPE_LOCAL_REFERENCE: /* * This is a deref_of (local_x | arg_x) * * Must resolve/dereference the local/arg reference first */ switch (operand[0]->reference.class) { case ACPI_REFCLASS_LOCAL: case ACPI_REFCLASS_ARG: /* Set Operand[0] to the value of the local/arg */ status = acpi_ds_method_data_get_value (operand[0]->reference.class, operand[0]->reference.value, walk_state, &temp_desc); if (ACPI_FAILURE(status)) { goto cleanup; } /* * Delete our reference to the input object and * point to the object just retrieved */ acpi_ut_remove_reference(operand[0]); operand[0] = temp_desc; break; case ACPI_REFCLASS_REFOF: /* Get the object to which the reference refers */ temp_desc = operand[0]->reference.object; acpi_ut_remove_reference(operand[0]); operand[0] = temp_desc; break; default: /* Must be an Index op - handled below */ break; } break; case ACPI_TYPE_STRING: break; default: status = AE_AML_OPERAND_TYPE; goto cleanup; } } if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) != ACPI_DESC_TYPE_NAMED) { if ((operand[0])->common.type == ACPI_TYPE_STRING) { /* * This is a deref_of (String). The string is a reference * to a named ACPI object. * * 1) Find the owning Node * 2) Dereference the node to an actual object. Could be a * Field, so we need to resolve the node to a value. */ status = acpi_ns_get_node_unlocked(walk_state-> scope_info->scope. node, operand[0]-> string.pointer, ACPI_NS_SEARCH_PARENT, ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &return_desc)); if (ACPI_FAILURE(status)) { goto cleanup; } status = acpi_ex_resolve_node_to_value (ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &return_desc), walk_state); goto cleanup; } } /* Operand[0] may have changed from the code above */ if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) == ACPI_DESC_TYPE_NAMED) { /* * This is a deref_of (object_reference) * Get the actual object from the Node (This is the dereference). * This case may only happen when a local_x or arg_x is * dereferenced above, or for references to device and * thermal objects. */ switch (((struct acpi_namespace_node *)operand[0])-> type) { case ACPI_TYPE_DEVICE: case ACPI_TYPE_THERMAL: /* These types have no node subobject, return the NS node */ return_desc = operand[0]; break; default: /* For most types, get the object attached to the node */ return_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)operand[0]); acpi_ut_add_reference(return_desc); break; } } else { /* * This must be a reference object produced by either the * Index() or ref_of() operator */ switch (operand[0]->reference.class) { case ACPI_REFCLASS_INDEX: /* * The target type for the Index operator must be * either a Buffer or a Package */ switch (operand[0]->reference.target_type) { case ACPI_TYPE_BUFFER_FIELD: temp_desc = operand[0]->reference.object; /* * Create a new object that contains one element of the * buffer -- the element pointed to by the index. * * NOTE: index into a buffer is NOT a pointer to a * sub-buffer of the main buffer, it is only a pointer to a * single element (byte) of the buffer! * * Since we are returning the value of the buffer at the * indexed location, we don't need to add an additional * reference to the buffer itself. */ return_desc = acpi_ut_create_integer_object((u64) temp_desc->buffer.pointer[operand[0]->reference.value]); if (!return_desc) { status = AE_NO_MEMORY; goto cleanup; } break; case ACPI_TYPE_PACKAGE: /* * Return the referenced element of the package. We must * add another reference to the referenced object, however. */ return_desc = *(operand[0]->reference.where); if (!return_desc) { /* * Element is NULL, do not allow the dereference. * This provides compatibility with other ACPI * implementations. */ return_ACPI_STATUS (AE_AML_UNINITIALIZED_ELEMENT); } acpi_ut_add_reference(return_desc); break; default: ACPI_ERROR((AE_INFO, "Unknown Index TargetType 0x%X in reference object %p", operand[0]->reference. target_type, operand[0])); status = AE_AML_OPERAND_TYPE; goto cleanup; } break; case ACPI_REFCLASS_REFOF: return_desc = operand[0]->reference.object; if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) == ACPI_DESC_TYPE_NAMED) { return_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *) return_desc); if (!return_desc) { break; } /* * June 2013: * buffer_fields/field_units require additional resolution */ switch (return_desc->common.type) { case ACPI_TYPE_BUFFER_FIELD: case ACPI_TYPE_LOCAL_REGION_FIELD: case ACPI_TYPE_LOCAL_BANK_FIELD: case ACPI_TYPE_LOCAL_INDEX_FIELD: status = acpi_ex_read_data_from_field (walk_state, return_desc, &temp_desc); if (ACPI_FAILURE(status)) { return_ACPI_STATUS (status); } return_desc = temp_desc; break; default: /* Add another reference to the object */ acpi_ut_add_reference (return_desc); break; } } break; default: ACPI_ERROR((AE_INFO, "Unknown class in reference(%p) - 0x%2.2X", operand[0], operand[0]->reference.class)); status = AE_TYPE; goto cleanup; } } break; default: ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X", walk_state->opcode)); status = AE_AML_BAD_OPCODE; goto cleanup; } cleanup: /* Delete return object on error */ if (ACPI_FAILURE(status)) { acpi_ut_remove_reference(return_desc); } /* Save return object on success */ else { walk_state->result_obj = return_desc; } return_ACPI_STATUS(status); }
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