utobject.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:14k
- /******************************************************************************
- *
- * Module Name: utobject - ACPI object create/delete/size/cache routines
- * $Revision: 57 $
- *
- *****************************************************************************/
- /*
- * 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 "acinterp.h"
- #include "acnamesp.h"
- #include "actables.h"
- #include "amlcode.h"
- #define _COMPONENT ACPI_UTILITIES
- MODULE_NAME ("utobject")
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_create_internal_object_dbg
- *
- * PARAMETERS: Address - Address of the memory to deallocate
- * Component - Component type of caller
- * Module - Source file name of caller
- * Line - Line number of caller
- * Type - ACPI Type of the new object
- *
- * RETURN: Object - The new object. Null on failure
- *
- * DESCRIPTION: Create and initialize a new internal object.
- *
- * NOTE: We always allocate the worst-case object descriptor because
- * these objects are cached, and we want them to be
- * one-size-satisifies-any-request. This in itself may not be
- * the most memory efficient, but the efficiency of the object
- * cache should more than make up for this!
- *
- ******************************************************************************/
- acpi_operand_object *
- acpi_ut_create_internal_object_dbg (
- NATIVE_CHAR *module_name,
- u32 line_number,
- u32 component_id,
- acpi_object_type8 type)
- {
- acpi_operand_object *object;
- FUNCTION_TRACE_STR ("Ut_create_internal_object_dbg", acpi_ut_get_type_name (type));
- /* Allocate the raw object descriptor */
- object = acpi_ut_allocate_object_desc_dbg (module_name, line_number, component_id);
- if (!object) {
- /* Allocation failure */
- return_PTR (NULL);
- }
- /* Save the object type in the object descriptor */
- object->common.type = type;
- /* Init the reference count */
- object->common.reference_count = 1;
- /* Any per-type initialization should go here */
- return_PTR (object);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_valid_internal_object
- *
- * PARAMETERS: Operand - Object to be validated
- *
- * RETURN: Validate a pointer to be an acpi_operand_object
- *
- ******************************************************************************/
- u8
- acpi_ut_valid_internal_object (
- void *object)
- {
- PROC_NAME ("Ut_valid_internal_object");
- /* Check for a null pointer */
- if (!object) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "**** Null Object Ptrn"));
- return (FALSE);
- }
- /* Check the descriptor type field */
- if (!VALID_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_INTERNAL)) {
- /* Not an ACPI internal object, do some further checking */
- if (VALID_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_NAMED)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "**** Obj %p is a named obj, not ACPI objn", object));
- }
- else if (VALID_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_PARSER)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "**** Obj %p is a parser obj, not ACPI objn", object));
- }
- else {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "**** Obj %p is of unknown typen", object));
- }
- return (FALSE);
- }
- /* The object appears to be a valid acpi_operand_object */
- return (TRUE);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_allocate_object_desc_dbg
- *
- * PARAMETERS: Module_name - Caller's module name (for error output)
- * Line_number - Caller's line number (for error output)
- * Component_id - Caller's component ID (for error output)
- * Message - Error message to use on failure
- *
- * RETURN: Pointer to newly allocated object descriptor. Null on error
- *
- * DESCRIPTION: Allocate a new object descriptor. Gracefully handle
- * error conditions.
- *
- ******************************************************************************/
- void *
- acpi_ut_allocate_object_desc_dbg (
- NATIVE_CHAR *module_name,
- u32 line_number,
- u32 component_id)
- {
- acpi_operand_object *object;
- FUNCTION_TRACE ("Ut_allocate_object_desc_dbg");
- object = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_OPERAND);
- if (!object) {
- _REPORT_ERROR (module_name, line_number, component_id,
- ("Could not allocate an object descriptorn"));
- return_PTR (NULL);
- }
- /* Mark the descriptor type */
- object->common.data_type = ACPI_DESC_TYPE_INTERNAL;
- ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "%p Size %Xn",
- object, sizeof (acpi_operand_object)));
- return_PTR (object);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_delete_object_desc
- *
- * PARAMETERS: Object - Acpi internal object to be deleted
- *
- * RETURN: None.
- *
- * DESCRIPTION: Free an ACPI object descriptor or add it to the object cache
- *
- ******************************************************************************/
- void
- acpi_ut_delete_object_desc (
- acpi_operand_object *object)
- {
- FUNCTION_TRACE_PTR ("Ut_delete_object_desc", object);
- /* Object must be an acpi_operand_object */
- if (object->common.data_type != ACPI_DESC_TYPE_INTERNAL) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Obj %p is not an ACPI objectn", object));
- return_VOID;
- }
- acpi_ut_release_to_cache (ACPI_MEM_LIST_OPERAND, object);
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_delete_object_cache
- *
- * PARAMETERS: None
- *
- * RETURN: Status
- *
- * DESCRIPTION: Purge the global state object cache. Used during subsystem
- * termination.
- *
- ******************************************************************************/
- void
- acpi_ut_delete_object_cache (
- void)
- {
- FUNCTION_TRACE ("Ut_delete_object_cache");
- acpi_ut_delete_generic_cache (ACPI_MEM_LIST_OPERAND);
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_get_simple_object_size
- *
- * PARAMETERS: *Internal_object - Pointer to the object we are examining
- * *Ret_length - Where the length is returned
- *
- * RETURN: Status
- *
- * DESCRIPTION: This function is called to determine the space required to
- * contain a simple object for return to an API user.
- *
- * The length includes the object structure plus any additional
- * needed space.
- *
- ******************************************************************************/
- acpi_status
- acpi_ut_get_simple_object_size (
- acpi_operand_object *internal_object,
- u32 *obj_length)
- {
- u32 length;
- acpi_status status = AE_OK;
- FUNCTION_TRACE_PTR ("Ut_get_simple_object_size", internal_object);
- /* Handle a null object (Could be a uninitialized package element -- which is legal) */
- if (!internal_object) {
- *obj_length = 0;
- return_ACPI_STATUS (AE_OK);
- }
- /* Start with the length of the Acpi object */
- length = sizeof (acpi_object);
- if (VALID_DESCRIPTOR_TYPE (internal_object, ACPI_DESC_TYPE_NAMED)) {
- /* Object is a named object (reference), just return the length */
- *obj_length = (u32) ROUND_UP_TO_NATIVE_WORD (length);
- return_ACPI_STATUS (status);
- }
- /*
- * The final length depends on the object type
- * Strings and Buffers are packed right up against the parent object and
- * must be accessed bytewise or there may be alignment problems on
- * certain processors
- */
- switch (internal_object->common.type) {
- case ACPI_TYPE_STRING:
- length += internal_object->string.length + 1;
- break;
- case ACPI_TYPE_BUFFER:
- length += internal_object->buffer.length;
- break;
- case ACPI_TYPE_INTEGER:
- case ACPI_TYPE_PROCESSOR:
- case ACPI_TYPE_POWER:
- /*
- * No extra data for these types
- */
- break;
- case INTERNAL_TYPE_REFERENCE:
- /*
- * The only type that should be here is internal opcode NAMEPATH_OP -- since
- * this means an object reference
- */
- if (internal_object->reference.opcode != AML_INT_NAMEPATH_OP) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Unsupported Reference opcode=%X in object %pn",
- internal_object->reference.opcode, internal_object));
- status = AE_TYPE;
- }
- else {
- /*
- * Get the actual length of the full pathname to this object.
- * The reference will be converted to the pathname to the object
- */
- length += ROUND_UP_TO_NATIVE_WORD (acpi_ns_get_pathname_length (internal_object->reference.node));
- }
- break;
- default:
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unsupported type=%X in object %pn",
- internal_object->common.type, internal_object));
- status = AE_TYPE;
- break;
- }
- /*
- * Account for the space required by the object rounded up to the next
- * multiple of the machine word size. This keeps each object aligned
- * on a machine word boundary. (preventing alignment faults on some
- * machines.)
- */
- *obj_length = (u32) ROUND_UP_TO_NATIVE_WORD (length);
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_get_element_length
- *
- * PARAMETERS: ACPI_PKG_CALLBACK
- *
- * RETURN: Status - the status of the call
- *
- * DESCRIPTION: Get the length of one package element.
- *
- ******************************************************************************/
- acpi_status
- acpi_ut_get_element_length (
- u8 object_type,
- acpi_operand_object *source_object,
- acpi_generic_state *state,
- void *context)
- {
- acpi_status status = AE_OK;
- acpi_pkg_info *info = (acpi_pkg_info *) context;
- u32 object_space;
- switch (object_type) {
- case 0:
- /*
- * Simple object - just get the size (Null object/entry is handled
- * here also) and sum it into the running package length
- */
- status = acpi_ut_get_simple_object_size (source_object, &object_space);
- if (ACPI_FAILURE (status)) {
- return (status);
- }
- info->length += object_space;
- break;
- case 1:
- /* Package - nothing much to do here, let the walk handle it */
- info->num_packages++;
- state->pkg.this_target_obj = NULL;
- break;
- default:
- return (AE_BAD_PARAMETER);
- }
- return (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_get_package_object_size
- *
- * PARAMETERS: *Internal_object - Pointer to the object we are examining
- * *Ret_length - Where the length is returned
- *
- * RETURN: Status
- *
- * DESCRIPTION: This function is called to determine the space required to
- * contain a package object for return to an API user.
- *
- * This is moderately complex since a package contains other
- * objects including packages.
- *
- ******************************************************************************/
- acpi_status
- acpi_ut_get_package_object_size (
- acpi_operand_object *internal_object,
- u32 *obj_length)
- {
- acpi_status status;
- acpi_pkg_info info;
- FUNCTION_TRACE_PTR ("Ut_get_package_object_size", internal_object);
- info.length = 0;
- info.object_space = 0;
- info.num_packages = 1;
- status = acpi_ut_walk_package_tree (internal_object, NULL,
- acpi_ut_get_element_length, &info);
- /*
- * We have handled all of the objects in all levels of the package.
- * just add the length of the package objects themselves.
- * Round up to the next machine word.
- */
- info.length += ROUND_UP_TO_NATIVE_WORD (sizeof (acpi_object)) *
- info.num_packages;
- /* Return the total package length */
- *obj_length = info.length;
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ut_get_object_size
- *
- * PARAMETERS: *Internal_object - Pointer to the object we are examining
- * *Ret_length - Where the length will be returned
- *
- * RETURN: Status
- *
- * DESCRIPTION: This function is called to determine the space required to
- * contain an object for return to an API user.
- *
- ******************************************************************************/
- acpi_status
- acpi_ut_get_object_size(
- acpi_operand_object *internal_object,
- u32 *obj_length)
- {
- acpi_status status;
- FUNCTION_ENTRY ();
- if ((VALID_DESCRIPTOR_TYPE (internal_object, ACPI_DESC_TYPE_INTERNAL)) &&
- (IS_THIS_OBJECT_TYPE (internal_object, ACPI_TYPE_PACKAGE))) {
- status = acpi_ut_get_package_object_size (internal_object, obj_length);
- }
- else {
- status = acpi_ut_get_simple_object_size (internal_object, obj_length);
- }
- return (status);
- }