/****************************************************************************** * * Module Name: dsopcode - Dispatcher Op Region support and handling of * "control" opcodes * *****************************************************************************/ /* * Copyright (C) 2000 - 2006, R. Byron Moore * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include #include #include #include #include #include #include #define _COMPONENT ACPI_DISPATCHER ACPI_MODULE_NAME("dsopcode") /* Local prototypes */ static acpi_status acpi_ds_execute_arguments(struct acpi_namespace_node *node, struct acpi_namespace_node *scope_node, u32 aml_length, u8 * aml_start); static acpi_status acpi_ds_init_buffer_field(u16 aml_opcode, union acpi_operand_object *obj_desc, union acpi_operand_object *buffer_desc, union acpi_operand_object *offset_desc, union acpi_operand_object *length_desc, union acpi_operand_object *result_desc); /******************************************************************************* * * FUNCTION: acpi_ds_execute_arguments * * PARAMETERS: Node - Object NS node * scope_node - Parent NS node * aml_length - Length of executable AML * aml_start - Pointer to the AML * * RETURN: Status. * * DESCRIPTION: Late (deferred) execution of region or field arguments * ******************************************************************************/ static acpi_status acpi_ds_execute_arguments(struct acpi_namespace_node *node, struct acpi_namespace_node *scope_node, u32 aml_length, u8 * aml_start) { acpi_status status; union acpi_parse_object *op; struct acpi_walk_state *walk_state; ACPI_FUNCTION_TRACE("ds_execute_arguments"); /* * Allocate a new parser op to be the root of the parsed tree */ op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP); if (!op) { return_ACPI_STATUS(AE_NO_MEMORY); } /* Save the Node for use in acpi_ps_parse_aml */ op->common.node = scope_node; /* Create and initialize a new parser state */ walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL); if (!walk_state) { status = AE_NO_MEMORY; goto cleanup; } status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start, aml_length, NULL, 1); if (ACPI_FAILURE(status)) { acpi_ds_delete_walk_state(walk_state); goto cleanup; } /* Mark this parse as a deferred opcode */ walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP; walk_state->deferred_node = node; /* Pass1: Parse the entire declaration */ status = acpi_ps_parse_aml(walk_state); if (ACPI_FAILURE(status)) { goto cleanup; } /* Get and init the Op created above */ op->common.node = node; acpi_ps_delete_parse_tree(op); /* Evaluate the deferred arguments */ op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP); if (!op) { return_ACPI_STATUS(AE_NO_MEMORY); } op->common.node = scope_node; /* Create and initialize a new parser state */ walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL); if (!walk_state) { status = AE_NO_MEMORY; goto cleanup; } /* Execute the opcode and arguments */ status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start, aml_length, NULL, 3); if (ACPI_FAILURE(status)) { acpi_ds_delete_walk_state(walk_state); goto cleanup; } /* Mark this execution as a deferred opcode */ walk_state->deferred_node = node; status = acpi_ps_parse_aml(walk_state); cleanup: acpi_ps_delete_parse_tree(op); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_get_buffer_field_arguments * * PARAMETERS: obj_desc - A valid buffer_field object * * RETURN: Status. * * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late * evaluation of these field attributes. * ******************************************************************************/ acpi_status acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc) { union acpi_operand_object *extra_desc; struct acpi_namespace_node *node; acpi_status status; ACPI_FUNCTION_TRACE_PTR("ds_get_buffer_field_arguments", obj_desc); if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { return_ACPI_STATUS(AE_OK); } /* Get the AML pointer (method object) and buffer_field node */ extra_desc = acpi_ns_get_secondary_object(obj_desc); node = obj_desc->buffer_field.node; ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname (ACPI_TYPE_BUFFER_FIELD, node, NULL)); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] buffer_field Arg Init\n", acpi_ut_get_node_name(node))); /* Execute the AML code for the term_arg arguments */ status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node), extra_desc->extra.aml_length, extra_desc->extra.aml_start); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_get_buffer_arguments * * PARAMETERS: obj_desc - A valid Buffer object * * RETURN: Status. * * DESCRIPTION: Get Buffer length and initializer byte list. This implements * the late evaluation of these attributes. * ******************************************************************************/ acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc) { struct acpi_namespace_node *node; acpi_status status; ACPI_FUNCTION_TRACE_PTR("ds_get_buffer_arguments", obj_desc); if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { return_ACPI_STATUS(AE_OK); } /* Get the Buffer node */ node = obj_desc->buffer.node; if (!node) { ACPI_ERROR((AE_INFO, "No pointer back to NS node in buffer obj %p", obj_desc)); return_ACPI_STATUS(AE_AML_INTERNAL); } ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n")); /* Execute the AML code for the term_arg arguments */ status = acpi_ds_execute_arguments(node, node, obj_desc->buffer.aml_length, obj_desc->buffer.aml_start); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_get_package_arguments * * PARAMETERS: obj_desc - A valid Package object * * RETURN: Status. * * DESCRIPTION: Get Package length and initializer byte list. This implements * the late evaluation of these attributes. * ******************************************************************************/ acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc) { struct acpi_namespace_node *node; acpi_status status; ACPI_FUNCTION_TRACE_PTR("ds_get_package_arguments", obj_desc); if (obj_desc->common.flags & AOPOBJ_DATA_VALID) { return_ACPI_STATUS(AE_OK); } /* Get the Package node */ node = obj_desc->package.node; if (!node) { ACPI_ERROR((AE_INFO, "No pointer back to NS node in package %p", obj_desc)); return_ACPI_STATUS(AE_AML_INTERNAL); } ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n")); /* Execute the AML code for the term_arg arguments */ status = acpi_ds_execute_arguments(node, node, obj_desc->package.aml_length, obj_desc->package.aml_start); return_ACPI_STATUS(status); } /***************************************************************************** * * FUNCTION: acpi_ds_get_region_arguments * * PARAMETERS: obj_desc - A valid region object * * RETURN: Status. * * DESCRIPTION: Get region address and length. This implements the late * evaluation of these region attributes. * ****************************************************************************/ acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc) { struct acpi_namespace_node *node; acpi_status status; union acpi_operand_object *extra_desc; ACPI_FUNCTION_TRACE_PTR("ds_get_region_arguments", obj_desc); if (obj_desc->region.flags & AOPOBJ_DATA_VALID) { return_ACPI_STATUS(AE_OK); } extra_desc = acpi_ns_get_secondary_object(obj_desc); if (!extra_desc) { return_ACPI_STATUS(AE_NOT_EXIST); } /* Get the Region node */ node = obj_desc->region.node; ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname (ACPI_TYPE_REGION, node, NULL)); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] op_region Arg Init at AML %p\n", acpi_ut_get_node_name(node), extra_desc->extra.aml_start)); /* Execute the argument AML */ status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node), extra_desc->extra.aml_length, extra_desc->extra.aml_start); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_initialize_region * * PARAMETERS: obj_handle - Region namespace node * * RETURN: Status * * DESCRIPTION: Front end to ev_initialize_region * ******************************************************************************/ acpi_status acpi_ds_initialize_region(acpi_handle obj_handle) { union acpi_operand_object *obj_desc; acpi_status status; obj_desc = acpi_ns_get_attached_object(obj_handle); /* Namespace is NOT locked */ status = acpi_ev_initialize_region(obj_desc, FALSE); return (status); } /******************************************************************************* * * FUNCTION: acpi_ds_init_buffer_field * * PARAMETERS: aml_opcode - create_xxx_field * obj_desc - buffer_field object * buffer_desc - Host Buffer * offset_desc - Offset into buffer * length_desc - Length of field (CREATE_FIELD_OP only) * result_desc - Where to store the result * * RETURN: Status * * DESCRIPTION: Perform actual initialization of a buffer field * ******************************************************************************/ static acpi_status acpi_ds_init_buffer_field(u16 aml_opcode, union acpi_operand_object *obj_desc, union acpi_operand_object *buffer_desc, union acpi_operand_object *offset_desc, union acpi_operand_object *length_desc, union acpi_operand_object *result_desc) { u32 offset; u32 bit_offset; u32 bit_count; u8 field_flags; acpi_status status; ACPI_FUNCTION_TRACE_PTR("ds_init_buffer_field", obj_desc); /* Host object must be a Buffer */ if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) { ACPI_ERROR((AE_INFO, "Target of Create Field is not a Buffer object - %s", acpi_ut_get_object_type_name(buffer_desc))); status = AE_AML_OPERAND_TYPE; goto cleanup; } /* * The last parameter to all of these opcodes (result_desc) started * out as a name_string, and should therefore now be a NS node * after resolution in acpi_ex_resolve_operands(). */ if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) { ACPI_ERROR((AE_INFO, "(%s) destination not a NS Node [%s]", acpi_ps_get_opcode_name(aml_opcode), acpi_ut_get_descriptor_name(result_desc))); status = AE_AML_OPERAND_TYPE; goto cleanup; } offset = (u32) offset_desc->integer.value; /* * Setup the Bit offsets and counts, according to the opcode */ switch (aml_opcode) { case AML_CREATE_FIELD_OP: /* Offset is in bits, count is in bits */ field_flags = AML_FIELD_ACCESS_BYTE; bit_offset = offset; bit_count = (u32) length_desc->integer.value; /* Must have a valid (>0) bit count */ if (bit_count == 0) { ACPI_ERROR((AE_INFO, "Attempt to create_field of length zero")); status = AE_AML_OPERAND_VALUE; goto cleanup; } break; case AML_CREATE_BIT_FIELD_OP: /* Offset is in bits, Field is one bit */ bit_offset = offset; bit_count = 1; field_flags = AML_FIELD_ACCESS_BYTE; break; case AML_CREATE_BYTE_FIELD_OP: /* Offset is in bytes, field is one byte */ bit_offset = 8 * offset; bit_count = 8; field_flags = AML_FIELD_ACCESS_BYTE; break; case AML_CREATE_WORD_FIELD_OP: /* Offset is in bytes, field is one word */ bit_offset = 8 * offset; bit_count = 16; field_flags = AML_FIELD_ACCESS_WORD; break; case AML_CREATE_DWORD_FIELD_OP: /* Offset is in bytes, field is one dword */ bit_offset = 8 * offset; bit_count = 32; field_flags = AML_FIELD_ACCESS_DWORD; break; case AML_CREATE_QWORD_FIELD_OP: /* Offset is in bytes, field is one qword */ bit_offset = 8 * offset; bit_count = 64; field_flags = AML_FIELD_ACCESS_QWORD; break; default: ACPI_ERROR((AE_INFO, "Unknown field creation opcode %02x", aml_opcode)); status = AE_AML_BAD_OPCODE; goto cleanup; } /* Entire field must fit within the current length of the buffer */ if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) { ACPI_ERROR((AE_INFO, "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)", acpi_ut_get_node_name(result_desc), bit_offset + bit_count, acpi_ut_get_node_name(buffer_desc->buffer.node), 8 * (u32) buffer_desc->buffer.length)); status = AE_AML_BUFFER_LIMIT; goto cleanup; } /* * Initialize areas of the field object that are common to all fields * For field_flags, use LOCK_RULE = 0 (NO_LOCK), * UPDATE_RULE = 0 (UPDATE_PRESERVE) */ status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0, bit_offset, bit_count); if (ACPI_FAILURE(status)) { goto cleanup; } obj_desc->buffer_field.buffer_obj = buffer_desc; /* Reference count for buffer_desc inherits obj_desc count */ buffer_desc->common.reference_count = (u16) (buffer_desc->common.reference_count + obj_desc->common.reference_count); cleanup: /* Always delete the operands */ acpi_ut_remove_reference(offset_desc); acpi_ut_remove_reference(buffer_desc); if (aml_opcode == AML_CREATE_FIELD_OP) { acpi_ut_remove_reference(length_desc); } /* On failure, delete the result descriptor */ if (ACPI_FAILURE(status)) { acpi_ut_remove_reference(result_desc); /* Result descriptor */ } else { /* Now the address and length are valid for this buffer_field */ obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID; } return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_eval_buffer_field_operands * * PARAMETERS: walk_state - Current walk * Op - A valid buffer_field Op object * * RETURN: Status * * DESCRIPTION: Get buffer_field Buffer and Index * Called from acpi_ds_exec_end_op during buffer_field parse tree walk * ******************************************************************************/ acpi_status acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *op) { acpi_status status; union acpi_operand_object *obj_desc; struct acpi_namespace_node *node; union acpi_parse_object *next_op; ACPI_FUNCTION_TRACE_PTR("ds_eval_buffer_field_operands", op); /* * This is where we evaluate the address and length fields of the * create_xxx_field declaration */ node = op->common.node; /* next_op points to the op that holds the Buffer */ next_op = op->common.value.arg; /* Evaluate/create the address and length operands */ status = acpi_ds_create_operands(walk_state, next_op); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } obj_desc = acpi_ns_get_attached_object(node); if (!obj_desc) { return_ACPI_STATUS(AE_NOT_EXIST); } /* Resolve the operands */ status = acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS, walk_state); ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE, acpi_ps_get_opcode_name(op->common.aml_opcode), walk_state->num_operands, "after acpi_ex_resolve_operands"); if (ACPI_FAILURE(status)) { ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)", acpi_ps_get_opcode_name(op->common.aml_opcode), status)); return_ACPI_STATUS(status); } /* Initialize the Buffer Field */ if (op->common.aml_opcode == AML_CREATE_FIELD_OP) { /* NOTE: Slightly different operands for this opcode */ status = acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc, walk_state->operands[0], walk_state->operands[1], walk_state->operands[2], walk_state->operands[3]); } else { /* All other, create_xxx_field opcodes */ status = acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc, walk_state->operands[0], walk_state->operands[1], NULL, walk_state->operands[2]); } return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_eval_region_operands * * PARAMETERS: walk_state - Current walk * Op - A valid region Op object * * RETURN: Status * * DESCRIPTION: Get region address and length * Called from acpi_ds_exec_end_op during op_region parse tree walk * ******************************************************************************/ acpi_status acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *op) { acpi_status status; union acpi_operand_object *obj_desc; union acpi_operand_object *operand_desc; struct acpi_namespace_node *node; union acpi_parse_object *next_op; ACPI_FUNCTION_TRACE_PTR("ds_eval_region_operands", op); /* * This is where we evaluate the address and length fields of the * op_region declaration */ node = op->common.node; /* next_op points to the op that holds the space_iD */ next_op = op->common.value.arg; /* next_op points to address op */ next_op = next_op->common.next; /* Evaluate/create the address and length operands */ status = acpi_ds_create_operands(walk_state, next_op); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Resolve the length and address operands to numbers */ status = acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS, walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE, acpi_ps_get_opcode_name(op->common.aml_opcode), 1, "after acpi_ex_resolve_operands"); obj_desc = acpi_ns_get_attached_object(node); if (!obj_desc) { return_ACPI_STATUS(AE_NOT_EXIST); } /* * Get the length operand and save it * (at Top of stack) */ operand_desc = walk_state->operands[walk_state->num_operands - 1]; obj_desc->region.length = (u32) operand_desc->integer.value; acpi_ut_remove_reference(operand_desc); /* * Get the address and save it * (at top of stack - 1) */ operand_desc = walk_state->operands[walk_state->num_operands - 2]; obj_desc->region.address = (acpi_physical_address) operand_desc->integer.value; acpi_ut_remove_reference(operand_desc); ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "rgn_obj %p Addr %8.8X%8.8X Len %X\n", obj_desc, ACPI_FORMAT_UINT64(obj_desc->region.address), obj_desc->region.length)); /* Now the address and length are valid for this opregion */ obj_desc->region.flags |= AOPOBJ_DATA_VALID; return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_eval_data_object_operands * * PARAMETERS: walk_state - Current walk * Op - A valid data_object Op object * obj_desc - data_object * * RETURN: Status * * DESCRIPTION: Get the operands and complete the following data object types: * Buffer, Package. * ******************************************************************************/ acpi_status acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state, union acpi_parse_object *op, union acpi_operand_object *obj_desc) { acpi_status status; union acpi_operand_object *arg_desc; u32 length; ACPI_FUNCTION_TRACE("ds_eval_data_object_operands"); /* The first operand (for all of these data objects) is the length */ status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } status = acpi_ex_resolve_operands(walk_state->opcode, &(walk_state-> operands[walk_state->num_operands - 1]), walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Extract length operand */ arg_desc = walk_state->operands[walk_state->num_operands - 1]; length = (u32) arg_desc->integer.value; /* Cleanup for length operand */ status = acpi_ds_obj_stack_pop(1, walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } acpi_ut_remove_reference(arg_desc); /* * Create the actual data object */ switch (op->common.aml_opcode) { case AML_BUFFER_OP: status = acpi_ds_build_internal_buffer_obj(walk_state, op, length, &obj_desc); break; case AML_PACKAGE_OP: case AML_VAR_PACKAGE_OP: status = acpi_ds_build_internal_package_obj(walk_state, op, length, &obj_desc); break; default: return_ACPI_STATUS(AE_AML_BAD_OPCODE); } if (ACPI_SUCCESS(status)) { /* * Return the object in the walk_state, unless the parent is a package - * in this case, the return object will be stored in the parse tree * for the package. */ if ((!op->common.parent) || ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) && (op->common.parent->common.aml_opcode != AML_VAR_PACKAGE_OP) && (op->common.parent->common.aml_opcode != AML_NAME_OP))) { walk_state->result_obj = obj_desc; } } return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_exec_begin_control_op * * PARAMETERS: walk_list - The list that owns the walk stack * Op - The control Op * * RETURN: Status * * DESCRIPTION: Handles all control ops encountered during control method * execution. * ******************************************************************************/ acpi_status acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state, union acpi_parse_object *op) { acpi_status status = AE_OK; union acpi_generic_state *control_state; ACPI_FUNCTION_NAME("ds_exec_begin_control_op"); ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op, op->common.aml_opcode, walk_state)); switch (op->common.aml_opcode) { case AML_IF_OP: case AML_WHILE_OP: /* * IF/WHILE: Create a new control state to manage these * constructs. We need to manage these as a stack, in order * to handle nesting. */ control_state = acpi_ut_create_control_state(); if (!control_state) { status = AE_NO_MEMORY; break; } /* * Save a pointer to the predicate for multiple executions * of a loop */ control_state->control.aml_predicate_start = walk_state->parser_state.aml - 1; control_state->control.package_end = walk_state->parser_state.pkg_end; control_state->control.opcode = op->common.aml_opcode; /* Push the control state on this walk's control stack */ acpi_ut_push_generic_state(&walk_state->control_state, control_state); break; case AML_ELSE_OP: /* Predicate is in the state object */ /* If predicate is true, the IF was executed, ignore ELSE part */ if (walk_state->last_predicate) { status = AE_CTRL_TRUE; } break; case AML_RETURN_OP: break; default: break; } return (status); } /******************************************************************************* * * FUNCTION: acpi_ds_exec_end_control_op * * PARAMETERS: walk_list - The list that owns the walk stack * Op - The control Op * * RETURN: Status * * DESCRIPTION: Handles all control ops encountered during control method * execution. * ******************************************************************************/ acpi_status acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state, union acpi_parse_object * op) { acpi_status status = AE_OK; union acpi_generic_state *control_state; ACPI_FUNCTION_NAME("ds_exec_end_control_op"); switch (op->common.aml_opcode) { case AML_IF_OP: ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op)); /* * Save the result of the predicate in case there is an * ELSE to come */ walk_state->last_predicate = (u8) walk_state->control_state->common.value; /* * Pop the control state that was created at the start * of the IF and free it */ control_state = acpi_ut_pop_generic_state(&walk_state->control_state); acpi_ut_delete_generic_state(control_state); break; case AML_ELSE_OP: break; case AML_WHILE_OP: ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op)); if (walk_state->control_state->common.value) { /* Predicate was true, go back and evaluate it again! */ status = AE_CTRL_PENDING; } ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] termination! Op=%p\n", op)); /* Pop this control state and free it */ control_state = acpi_ut_pop_generic_state(&walk_state->control_state); walk_state->aml_last_while = control_state->control.aml_predicate_start; acpi_ut_delete_generic_state(control_state); break; case AML_RETURN_OP: ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[RETURN_OP] Op=%p Arg=%p\n", op, op->common.value.arg)); /* * One optional operand -- the return value * It can be either an immediate operand or a result that * has been bubbled up the tree */ if (op->common.value.arg) { /* Since we have a real Return(), delete any implicit return */ acpi_ds_clear_implicit_return(walk_state); /* Return statement has an immediate operand */ status = acpi_ds_create_operands(walk_state, op->common.value.arg); if (ACPI_FAILURE(status)) { return (status); } /* * If value being returned is a Reference (such as * an arg or local), resolve it now because it may * cease to exist at the end of the method. */ status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state); if (ACPI_FAILURE(status)) { return (status); } /* * Get the return value and save as the last result * value. This is the only place where walk_state->return_desc * is set to anything other than zero! */ walk_state->return_desc = walk_state->operands[0]; } else if ((walk_state->results) && (walk_state->results->results.num_results > 0)) { /* Since we have a real Return(), delete any implicit return */ acpi_ds_clear_implicit_return(walk_state); /* * The return value has come from a previous calculation. * * If value being returned is a Reference (such as * an arg or local), resolve it now because it may * cease to exist at the end of the method. * * Allow references created by the Index operator to return unchanged. */ if ((ACPI_GET_DESCRIPTOR_TYPE (walk_state->results->results.obj_desc[0]) == ACPI_DESC_TYPE_OPERAND) && (ACPI_GET_OBJECT_TYPE (walk_state->results->results.obj_desc[0]) == ACPI_TYPE_LOCAL_REFERENCE) && ((walk_state->results->results.obj_desc[0])-> reference.opcode != AML_INDEX_OP)) { status = acpi_ex_resolve_to_value(&walk_state-> results->results. obj_desc[0], walk_state); if (ACPI_FAILURE(status)) { return (status); } } walk_state->return_desc = walk_state->results->results.obj_desc[0]; } else { /* No return operand */ if (walk_state->num_operands) { acpi_ut_remove_reference(walk_state-> operands[0]); } walk_state->operands[0] = NULL; walk_state->num_operands = 0; walk_state->return_desc = NULL; } ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Completed RETURN_OP State=%p, ret_val=%p\n", walk_state, walk_state->return_desc)); /* End the control method execution right now */ status = AE_CTRL_TERMINATE; break; case AML_NOOP_OP: /* Just do nothing! */ break; case AML_BREAK_POINT_OP: /* Call up to the OS service layer to handle this */ status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT, "Executed AML Breakpoint opcode"); /* If and when it returns, all done. */ break; case AML_BREAK_OP: case AML_CONTINUE_OP: /* ACPI 2.0 */ /* Pop and delete control states until we find a while */ while (walk_state->control_state && (walk_state->control_state->control.opcode != AML_WHILE_OP)) { control_state = acpi_ut_pop_generic_state(&walk_state-> control_state); acpi_ut_delete_generic_state(control_state); } /* No while found? */ if (!walk_state->control_state) { return (AE_AML_NO_WHILE); } /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */ walk_state->aml_last_while = walk_state->control_state->control.package_end; /* Return status depending on opcode */ if (op->common.aml_opcode == AML_BREAK_OP) { status = AE_CTRL_BREAK; } else { status = AE_CTRL_CONTINUE; } break; default: ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p", op->common.aml_opcode, op)); status = AE_AML_BAD_OPCODE; break; } return (status); }