dsfield.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:12k
- /******************************************************************************
- *
- * Module Name: dsfield - Dispatcher field routines
- * $Revision: 46 $
- *
- *****************************************************************************/
- /*
- * 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 "amlcode.h"
- #include "acdispat.h"
- #include "acinterp.h"
- #include "acnamesp.h"
- #include "acparser.h"
- #define _COMPONENT ACPI_DISPATCHER
- MODULE_NAME ("dsfield")
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_create_buffer_field
- *
- * PARAMETERS: Opcode - The opcode to be executed
- * Operands - List of operands for the opcode
- * Walk_state - Current state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Execute the Create_field operators:
- * Create_bit_field_op,
- * Create_byte_field_op,
- * Create_word_field_op,
- * Create_dWord_field_op,
- * Create_qWord_field_op,
- * Create_field_op (all of which define fields in buffers)
- *
- ******************************************************************************/
- acpi_status
- acpi_ds_create_buffer_field (
- acpi_parse_object *op,
- acpi_walk_state *walk_state)
- {
- acpi_parse_object *arg;
- acpi_namespace_node *node;
- acpi_status status;
- acpi_operand_object *obj_desc;
- FUNCTION_TRACE ("Ds_create_buffer_field");
- /* Get the Name_string argument */
- if (op->opcode == AML_CREATE_FIELD_OP) {
- arg = acpi_ps_get_arg (op, 3);
- }
- else {
- /* Create Bit/Byte/Word/Dword field */
- arg = acpi_ps_get_arg (op, 2);
- }
- if (!arg) {
- return_ACPI_STATUS (AE_AML_NO_OPERAND);
- }
- /*
- * Enter the Name_string into the namespace
- */
- status = acpi_ns_lookup (walk_state->scope_info, arg->value.string,
- INTERNAL_TYPE_DEF_ANY, IMODE_LOAD_PASS1,
- NS_NO_UPSEARCH | NS_DONT_OPEN_SCOPE,
- walk_state, &(node));
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* We could put the returned object (Node) on the object stack for later, but
- * for now, we will put it in the "op" object that the parser uses, so we
- * can get it again at the end of this scope
- */
- op->node = node;
- /*
- * If there is no object attached to the node, this node was just created and
- * we need to create the field object. Otherwise, this was a lookup of an
- * existing node and we don't want to create the field object again.
- */
- if (node->object) {
- return_ACPI_STATUS (AE_OK);
- }
- /*
- * The Field definition is not fully parsed at this time.
- * (We must save the address of the AML for the buffer and index operands)
- */
- /* Create the buffer field object */
- obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_BUFFER_FIELD);
- if (!obj_desc) {
- status = AE_NO_MEMORY;
- goto cleanup;
- }
- /*
- * Allocate a method object for this field unit
- */
- obj_desc->buffer_field.extra = acpi_ut_create_internal_object (
- INTERNAL_TYPE_EXTRA);
- if (!obj_desc->buffer_field.extra) {
- status = AE_NO_MEMORY;
- goto cleanup;
- }
- /*
- * Remember location in AML stream of the field unit
- * opcode and operands -- since the buffer and index
- * operands must be evaluated.
- */
- obj_desc->buffer_field.extra->extra.aml_start = ((acpi_parse2_object *) op)->data;
- obj_desc->buffer_field.extra->extra.aml_length = ((acpi_parse2_object *) op)->length;
- obj_desc->buffer_field.node = node;
- /* Attach constructed field descriptor to parent node */
- status = acpi_ns_attach_object (node, obj_desc, ACPI_TYPE_BUFFER_FIELD);
- cleanup:
- /* Remove local reference to the object */
- acpi_ut_remove_reference (obj_desc);
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_get_field_names
- *
- * PARAMETERS: Info - Create_field info structure
- * ` Walk_state - Current method state
- * Arg - First parser arg for the field name list
- *
- * RETURN: Status
- *
- * DESCRIPTION: Process all named fields in a field declaration. Names are
- * entered into the namespace.
- *
- ******************************************************************************/
- acpi_status
- acpi_ds_get_field_names (
- ACPI_CREATE_FIELD_INFO *info,
- acpi_walk_state *walk_state,
- acpi_parse_object *arg)
- {
- acpi_status status;
- FUNCTION_TRACE_U32 ("Ds_get_field_names", info);
- /* First field starts at bit zero */
- info->field_bit_position = 0;
- /* Process all elements in the field list (of parse nodes) */
- while (arg) {
- /*
- * Three types of field elements are handled:
- * 1) Offset - specifies a bit offset
- * 2) Access_as - changes the access mode
- * 3) Name - Enters a new named field into the namespace
- */
- switch (arg->opcode) {
- case AML_INT_RESERVEDFIELD_OP:
- info->field_bit_position += arg->value.size;
- break;
- case AML_INT_ACCESSFIELD_OP:
- /*
- * Get a new Access_type and Access_attribute for all
- * entries (until end or another Access_as keyword)
- */
- info->field_flags = (u8) ((info->field_flags & FIELD_ACCESS_TYPE_MASK) ||
- ((u8) (arg->value.integer >> 8)));
- break;
- case AML_INT_NAMEDFIELD_OP:
- /* Enter a new field name into the namespace */
- status = acpi_ns_lookup (walk_state->scope_info,
- (NATIVE_CHAR *) &((acpi_parse2_object *)arg)->name,
- info->field_type, IMODE_LOAD_PASS1,
- NS_NO_UPSEARCH | NS_DONT_OPEN_SCOPE,
- NULL, &info->field_node);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Create and initialize an object for the new Field Node */
- info->field_bit_length = arg->value.size;
- status = acpi_ex_prep_field_value (info);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Keep track of bit position for the next field */
- info->field_bit_position += info->field_bit_length;
- break;
- default:
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid opcode in field list: %Xn",
- arg->opcode));
- return_ACPI_STATUS (AE_AML_ERROR);
- break;
- }
- arg = arg->next;
- }
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_create_field
- *
- * PARAMETERS: Op - Op containing the Field definition and args
- * Region_node - Object for the containing Operation Region
- * ` Walk_state - Current method state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Create a new field in the specified operation region
- *
- ******************************************************************************/
- acpi_status
- acpi_ds_create_field (
- acpi_parse_object *op,
- acpi_namespace_node *region_node,
- acpi_walk_state *walk_state)
- {
- acpi_status status = AE_AML_ERROR;
- acpi_parse_object *arg;
- ACPI_CREATE_FIELD_INFO info;
- FUNCTION_TRACE_PTR ("Ds_create_field", op);
- /* First arg is the name of the parent Op_region (must already exist) */
- arg = op->value.arg;
- if (!region_node) {
- status = acpi_ns_lookup (walk_state->scope_info, arg->value.name,
- ACPI_TYPE_REGION, IMODE_EXECUTE,
- NS_SEARCH_PARENT, walk_state, ®ion_node);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- }
- /* Second arg is the field flags */
- arg = arg->next;
- info.field_flags = arg->value.integer8;
- /* Each remaining arg is a Named Field */
- info.field_type = INTERNAL_TYPE_REGION_FIELD;
- info.region_node = region_node;
- status = acpi_ds_get_field_names (&info, walk_state, arg->next);
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_create_bank_field
- *
- * PARAMETERS: Op - Op containing the Field definition and args
- * Region_node - Object for the containing Operation Region
- * ` Walk_state - Current method state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Create a new bank field in the specified operation region
- *
- ******************************************************************************/
- acpi_status
- acpi_ds_create_bank_field (
- acpi_parse_object *op,
- acpi_namespace_node *region_node,
- acpi_walk_state *walk_state)
- {
- acpi_status status = AE_AML_ERROR;
- acpi_parse_object *arg;
- ACPI_CREATE_FIELD_INFO info;
- FUNCTION_TRACE_PTR ("Ds_create_bank_field", op);
- /* First arg is the name of the parent Op_region (must already exist) */
- arg = op->value.arg;
- if (!region_node) {
- status = acpi_ns_lookup (walk_state->scope_info, arg->value.name,
- ACPI_TYPE_REGION, IMODE_EXECUTE,
- NS_SEARCH_PARENT, walk_state, ®ion_node);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- }
- /* Second arg is the Bank Register (must already exist) */
- arg = arg->next;
- status = acpi_ns_lookup (walk_state->scope_info, arg->value.string,
- INTERNAL_TYPE_BANK_FIELD_DEFN, IMODE_EXECUTE,
- NS_SEARCH_PARENT, walk_state, &info.register_node);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Third arg is the Bank_value */
- arg = arg->next;
- info.bank_value = arg->value.integer32;
- /* Fourth arg is the field flags */
- arg = arg->next;
- info.field_flags = arg->value.integer8;
- /* Each remaining arg is a Named Field */
- info.field_type = INTERNAL_TYPE_BANK_FIELD;
- info.region_node = region_node;
- status = acpi_ds_get_field_names (&info, walk_state, arg->next);
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_create_index_field
- *
- * PARAMETERS: Op - Op containing the Field definition and args
- * Region_node - Object for the containing Operation Region
- * ` Walk_state - Current method state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Create a new index field in the specified operation region
- *
- ******************************************************************************/
- acpi_status
- acpi_ds_create_index_field (
- acpi_parse_object *op,
- acpi_namespace_node *region_node,
- acpi_walk_state *walk_state)
- {
- acpi_status status;
- acpi_parse_object *arg;
- ACPI_CREATE_FIELD_INFO info;
- FUNCTION_TRACE_PTR ("Ds_create_index_field", op);
- /* First arg is the name of the Index register (must already exist) */
- arg = op->value.arg;
- status = acpi_ns_lookup (walk_state->scope_info, arg->value.string,
- ACPI_TYPE_ANY, IMODE_EXECUTE,
- NS_SEARCH_PARENT, walk_state, &info.register_node);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Second arg is the data register (must already exist) */
- arg = arg->next;
- status = acpi_ns_lookup (walk_state->scope_info, arg->value.string,
- INTERNAL_TYPE_INDEX_FIELD_DEFN, IMODE_EXECUTE,
- NS_SEARCH_PARENT, walk_state, &info.data_register_node);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Next arg is the field flags */
- arg = arg->next;
- info.field_flags = arg->value.integer8;
- /* Each remaining arg is a Named Field */
- info.field_type = INTERNAL_TYPE_INDEX_FIELD;
- info.region_node = region_node;
- status = acpi_ds_get_field_names (&info, walk_state, arg->next);
- return_ACPI_STATUS (status);
- }