dsopcode.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:25k
- /******************************************************************************
- *
- * Module Name: dsopcode - Dispatcher Op Region support and handling of
- * "control" opcodes
- * $Revision: 56 $
- *
- *****************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acparser.h"
- #include "amlcode.h"
- #include "acdispat.h"
- #include "acinterp.h"
- #include "acnamesp.h"
- #include "acevents.h"
- #include "actables.h"
- #define _COMPONENT ACPI_DISPATCHER
- MODULE_NAME ("dsopcode")
- /*****************************************************************************
- *
- * 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 (
- acpi_operand_object *obj_desc)
- {
- acpi_operand_object *extra_desc;
- acpi_namespace_node *node;
- acpi_parse_object *op;
- acpi_parse_object *field_op;
- acpi_status status;
- acpi_table_desc *table_desc;
- acpi_walk_state *walk_state;
- 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 = obj_desc->buffer_field.extra;
- node = obj_desc->buffer_field.node;
- DEBUG_EXEC(acpi_ut_display_init_pathname (node, " [Field]"));
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[%4.4s] Buffer_field JIT Initn",
- (char*)&node->name));
- /*
- * Allocate a new parser op to be the root of the parsed
- * Op_region tree
- */
- op = acpi_ps_alloc_op (AML_SCOPE_OP);
- if (!op) {
- return (AE_NO_MEMORY);
- }
- /* Save the Node for use in Acpi_ps_parse_aml */
- op->node = acpi_ns_get_parent_object (node);
- /* Get a handle to the parent ACPI table */
- status = acpi_tb_handle_to_object (node->owner_id, &table_desc);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Create and initialize a new parser state */
- walk_state = acpi_ds_create_walk_state (TABLE_ID_DSDT,
- NULL, NULL, NULL);
- if (!walk_state) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- status = acpi_ds_init_aml_walk (walk_state, op, NULL, extra_desc->extra.aml_start,
- extra_desc->extra.aml_length, NULL, NULL, 1);
- if (ACPI_FAILURE (status)) {
- /* TBD: delete walk state */
- return_ACPI_STATUS (status);
- }
- /* TBD: No Walk flags?? */
- walk_state->parse_flags = 0;
- /* Pass1: Parse the entire Buffer_field declaration */
- status = acpi_ps_parse_aml (walk_state);
- if (ACPI_FAILURE (status)) {
- acpi_ps_delete_parse_tree (op);
- return_ACPI_STATUS (status);
- }
- /* Get and init the actual Field_unit Op created above */
- field_op = op->value.arg;
- op->node = node;
- field_op = op->value.arg;
- field_op->node = node;
- acpi_ps_delete_parse_tree (op);
- /* Evaluate the address and length arguments for the Op_region */
- op = acpi_ps_alloc_op (AML_SCOPE_OP);
- if (!op) {
- return (AE_NO_MEMORY);
- }
- op->node = acpi_ns_get_parent_object (node);
- /* Create and initialize a new parser state */
- walk_state = acpi_ds_create_walk_state (TABLE_ID_DSDT,
- NULL, NULL, NULL);
- if (!walk_state) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- status = acpi_ds_init_aml_walk (walk_state, op, NULL, extra_desc->extra.aml_start,
- extra_desc->extra.aml_length, NULL, NULL, 3);
- if (ACPI_FAILURE (status)) {
- /* TBD: delete walk state */
- return_ACPI_STATUS (status);
- }
- status = acpi_ps_parse_aml (walk_state);
- acpi_ps_delete_parse_tree (op);
- /*
- * The pseudo-method object is no longer needed since the region is
- * now initialized
- */
- acpi_ut_remove_reference (obj_desc->buffer_field.extra);
- obj_desc->buffer_field.extra = NULL;
- 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 (
- acpi_operand_object *obj_desc)
- {
- acpi_operand_object *extra_desc = NULL;
- acpi_namespace_node *node;
- acpi_parse_object *op;
- acpi_parse_object *region_op;
- acpi_status status;
- acpi_table_desc *table_desc;
- acpi_walk_state *walk_state;
- FUNCTION_TRACE_PTR ("Ds_get_region_arguments", obj_desc);
- if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
- return_ACPI_STATUS (AE_OK);
- }
- /* Get the AML pointer (method object) and region node */
- extra_desc = obj_desc->region.extra;
- node = obj_desc->region.node;
- DEBUG_EXEC(acpi_ut_display_init_pathname (node, " [Operation Region]"));
- ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[%4.4s] Op_region Init at AML %pn",
- (char*)&node->name, extra_desc->extra.aml_start));
- /*
- * Allocate a new parser op to be the root of the parsed
- * Op_region tree
- */
- op = acpi_ps_alloc_op (AML_SCOPE_OP);
- if (!op) {
- return (AE_NO_MEMORY);
- }
- /* Save the Node for use in Acpi_ps_parse_aml */
- op->node = acpi_ns_get_parent_object (node);
- /* Get a handle to the parent ACPI table */
- status = acpi_tb_handle_to_object (node->owner_id, &table_desc);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Create and initialize a new parser state */
- walk_state = acpi_ds_create_walk_state (TABLE_ID_DSDT,
- op, NULL, NULL);
- if (!walk_state) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- status = acpi_ds_init_aml_walk (walk_state, op, NULL, extra_desc->extra.aml_start,
- extra_desc->extra.aml_length, NULL, NULL, 1);
- if (ACPI_FAILURE (status)) {
- /* TBD: delete walk state */
- return_ACPI_STATUS (status);
- }
- /* TBD: No Walk flags?? */
- walk_state->parse_flags = 0;
- /* Parse the entire Op_region declaration, creating a parse tree */
- status = acpi_ps_parse_aml (walk_state);
- if (ACPI_FAILURE (status)) {
- acpi_ps_delete_parse_tree (op);
- return_ACPI_STATUS (status);
- }
- /* Get and init the actual Region_op created above */
- region_op = op->value.arg;
- op->node = node;
- region_op = op->value.arg;
- region_op->node = node;
- acpi_ps_delete_parse_tree (op);
- /* Evaluate the address and length arguments for the Op_region */
- op = acpi_ps_alloc_op (AML_SCOPE_OP);
- if (!op) {
- return (AE_NO_MEMORY);
- }
- op->node = acpi_ns_get_parent_object (node);
- /* Create and initialize a new parser state */
- walk_state = acpi_ds_create_walk_state (TABLE_ID_DSDT,
- op, NULL, NULL);
- if (!walk_state) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- status = acpi_ds_init_aml_walk (walk_state, op, NULL, extra_desc->extra.aml_start,
- extra_desc->extra.aml_length, NULL, NULL, 3);
- if (ACPI_FAILURE (status)) {
- /* TBD: delete walk state */
- return_ACPI_STATUS (status);
- }
- status = acpi_ps_parse_aml (walk_state);
- acpi_ps_delete_parse_tree (op);
- return_ACPI_STATUS (status);
- }
- /*****************************************************************************
- *
- * FUNCTION: Acpi_ds_initialize_region
- *
- * PARAMETERS: Op - A valid region Op object
- *
- * RETURN: Status
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
- acpi_status
- acpi_ds_initialize_region (
- acpi_handle obj_handle)
- {
- 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_eval_buffer_field_operands
- *
- * PARAMETERS: 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 SPECIFICATION REFERENCES:
- * Each of the Buffer Field opcodes is defined as specified in in-line
- * comments below. For each one, use the following definitions.
- *
- * Def_bit_field := Bit_field_op Src_buf Bit_idx Destination
- * Def_byte_field := Byte_field_op Src_buf Byte_idx Destination
- * Def_create_field := Create_field_op Src_buf Bit_idx Num_bits Name_string
- * Def_dWord_field := DWord_field_op Src_buf Byte_idx Destination
- * Def_word_field := Word_field_op Src_buf Byte_idx Destination
- * Bit_index := Term_arg=>Integer
- * Byte_index := Term_arg=>Integer
- * Destination := Name_string
- * Num_bits := Term_arg=>Integer
- * Source_buf := Term_arg=>Buffer
- *
- ****************************************************************************/
- acpi_status
- acpi_ds_eval_buffer_field_operands (
- acpi_walk_state *walk_state,
- acpi_parse_object *op)
- {
- acpi_status status;
- acpi_operand_object *obj_desc;
- acpi_namespace_node *node;
- acpi_parse_object *next_op;
- u32 offset;
- u32 bit_offset;
- u32 bit_count;
- u8 field_flags;
- acpi_operand_object *res_desc = NULL;
- acpi_operand_object *cnt_desc = NULL;
- acpi_operand_object *off_desc = NULL;
- acpi_operand_object *src_desc = NULL;
- 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->node;
- /* Next_op points to the op that holds the Buffer */
- next_op = op->value.arg;
- /* Acpi_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->opcode, WALK_OPERANDS, walk_state);
- DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE, acpi_ps_get_opcode_name (op->opcode),
- walk_state->num_operands, "after Acpi_ex_resolve_operands");
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "(%s) bad operand(s) (%X)n",
- acpi_ps_get_opcode_name (op->opcode), status));
- goto cleanup;
- }
- /* Get the operands */
- if (AML_CREATE_FIELD_OP == op->opcode) {
- res_desc = walk_state->operands[3];
- cnt_desc = walk_state->operands[2];
- }
- else {
- res_desc = walk_state->operands[2];
- }
- off_desc = walk_state->operands[1];
- src_desc = walk_state->operands[0];
- offset = (u32) off_desc->integer.value;
- /*
- * If Res_desc is a Name, it will be a direct name pointer after
- * Acpi_ex_resolve_operands()
- */
- if (!VALID_DESCRIPTOR_TYPE (res_desc, ACPI_DESC_TYPE_NAMED)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "(%s) destination must be a Noden",
- acpi_ps_get_opcode_name (op->opcode)));
- status = AE_AML_OPERAND_TYPE;
- goto cleanup;
- }
- /*
- * Setup the Bit offsets and counts, according to the opcode
- */
- switch (op->opcode) {
- /* Def_create_field */
- case AML_CREATE_FIELD_OP:
- /* Offset is in bits, count is in bits */
- bit_offset = offset;
- bit_count = (u32) cnt_desc->integer.value;
- field_flags = ACCESS_BYTE_ACC;
- break;
- /* Def_create_bit_field */
- case AML_CREATE_BIT_FIELD_OP:
- /* Offset is in bits, Field is one bit */
- bit_offset = offset;
- bit_count = 1;
- field_flags = ACCESS_BYTE_ACC;
- break;
- /* Def_create_byte_field */
- case AML_CREATE_BYTE_FIELD_OP:
- /* Offset is in bytes, field is one byte */
- bit_offset = 8 * offset;
- bit_count = 8;
- field_flags = ACCESS_BYTE_ACC;
- break;
- /* Def_create_word_field */
- case AML_CREATE_WORD_FIELD_OP:
- /* Offset is in bytes, field is one word */
- bit_offset = 8 * offset;
- bit_count = 16;
- field_flags = ACCESS_WORD_ACC;
- break;
- /* Def_create_dWord_field */
- case AML_CREATE_DWORD_FIELD_OP:
- /* Offset is in bytes, field is one dword */
- bit_offset = 8 * offset;
- bit_count = 32;
- field_flags = ACCESS_DWORD_ACC;
- break;
- /* Def_create_qWord_field */
- case AML_CREATE_QWORD_FIELD_OP:
- /* Offset is in bytes, field is one qword */
- bit_offset = 8 * offset;
- bit_count = 64;
- field_flags = ACCESS_QWORD_ACC;
- break;
- default:
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Internal error - unknown field creation opcode %02xn",
- op->opcode));
- status = AE_AML_BAD_OPCODE;
- goto cleanup;
- }
- /*
- * Setup field according to the object type
- */
- switch (src_desc->common.type) {
- /* Source_buff := Term_arg=>Buffer */
- case ACPI_TYPE_BUFFER:
- if ((bit_offset + bit_count) >
- (8 * (u32) src_desc->buffer.length)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Field size %d exceeds Buffer size %d (bits)n",
- bit_offset + bit_count, 8 * (u32) src_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,
- bit_offset, bit_count);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- obj_desc->buffer_field.buffer_obj = src_desc;
- /* Reference count for Src_desc inherits Obj_desc count */
- src_desc->common.reference_count = (u16) (src_desc->common.reference_count +
- obj_desc->common.reference_count);
- break;
- /* Improper object type */
- default:
- if ((src_desc->common.type > (u8) INTERNAL_TYPE_REFERENCE) || !acpi_ut_valid_object_type (src_desc->common.type)) /* TBD: This line MUST be a single line until Acpi_src can handle it (block deletion) */ {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Tried to create field in invalid object type %Xn",
- src_desc->common.type));
- }
- else {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Tried to create field in improper object type - %sn",
- acpi_ut_get_type_name (src_desc->common.type)));
- }
- status = AE_AML_OPERAND_TYPE;
- goto cleanup;
- }
- if (AML_CREATE_FIELD_OP == op->opcode) {
- /* Delete object descriptor unique to Create_field */
- acpi_ut_remove_reference (cnt_desc);
- cnt_desc = NULL;
- }
- cleanup:
- /* Always delete the operands */
- acpi_ut_remove_reference (off_desc);
- acpi_ut_remove_reference (src_desc);
- if (AML_CREATE_FIELD_OP == op->opcode) {
- acpi_ut_remove_reference (cnt_desc);
- }
- /* On failure, delete the result descriptor */
- if (ACPI_FAILURE (status)) {
- acpi_ut_remove_reference (res_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_region_operands
- *
- * PARAMETERS: 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 (
- acpi_walk_state *walk_state,
- acpi_parse_object *op)
- {
- acpi_status status;
- acpi_operand_object *obj_desc;
- acpi_operand_object *operand_desc;
- acpi_namespace_node *node;
- acpi_parse_object *next_op;
- 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->node;
- /* Next_op points to the op that holds the Space_iD */
- next_op = op->value.arg;
- /* Next_op points to address op */
- next_op = next_op->next;
- /* Acpi_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->opcode, WALK_OPERANDS, walk_state);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE,
- acpi_ps_get_opcode_name (op->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 %Xn",
- obj_desc, HIDWORD(obj_desc->region.address), LODWORD(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_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 (
- acpi_walk_state *walk_state,
- acpi_parse_object *op)
- {
- acpi_status status = AE_OK;
- acpi_generic_state *control_state;
- PROC_NAME ("Ds_exec_begin_control_op");
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%pn", op,
- op->opcode, walk_state));
- switch (op->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;
- }
- acpi_ut_push_generic_state (&walk_state->control_state, control_state);
- /*
- * Save a pointer to the predicate for multiple executions
- * of a loop
- */
- walk_state->control_state->control.aml_predicate_start =
- walk_state->parser_state.aml - 1;
- /* TBD: can this be removed? */
- /*Acpi_ps_pkg_length_encoding_size (GET8 (Walk_state->Parser_state->Aml));*/
- 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 (
- acpi_walk_state *walk_state,
- acpi_parse_object *op)
- {
- acpi_status status = AE_OK;
- acpi_generic_state *control_state;
- PROC_NAME ("Ds_exec_end_control_op");
- switch (op->opcode) {
- case AML_IF_OP:
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[IF_OP] Op=%pn", 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=%pn", 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=%pn", 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=%pn",op, op->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->value.arg) {
- /* Return statement has an immediate operand */
- status = acpi_ds_create_operands (walk_state, op->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)) {
- /*
- * 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 (VALID_DESCRIPTOR_TYPE (walk_state->results->results.obj_desc [0], ACPI_DESC_TYPE_INTERNAL) &&
- ((walk_state->results->results.obj_desc [0])->common.type == INTERNAL_TYPE_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=%pn",
- 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 */
- acpi_os_signal (ACPI_SIGNAL_BREAKPOINT, "Executed AML Breakpoint opcode");
- /* If and when it returns, all done. */
- break;
- case AML_BREAK_OP:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "Break to end of current package, Op=%pn", op));
- /* TBD: update behavior for ACPI 2.0 */
- /*
- * As per the ACPI specification:
- * "The break operation causes the current package
- * execution to complete"
- * "Break -- Stop executing the current code package
- * at this point"
- *
- * Returning AE_FALSE here will cause termination of
- * the current package, and execution will continue one
- * level up, starting with the completion of the parent Op.
- */
- status = AE_CTRL_FALSE;
- break;
- case AML_CONTINUE_OP: /* ACPI 2.0 */
- status = AE_NOT_IMPLEMENTED;
- break;
- default:
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown control opcode=%X Op=%pn",
- op->opcode, op));
- status = AE_AML_BAD_OPCODE;
- break;
- }
- return (status);
- }