dsobject.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/******************************************************************************
 *
 * Module Name: dsobject - Dispatcher object management routines
 *              $Revision: 81 $
 *
 *****************************************************************************/

/*
 *  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"

#define _COMPONENT          ACPI_DISPATCHER
	 MODULE_NAME         ("dsobject")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_init_one_object
 *
 * PARAMETERS:  Obj_handle      - Node
 *              Level           - Current nesting level
 *              Context         - Points to a init info struct
 *              Return_value    - Not used
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Callback from Acpi_walk_namespace. Invoked for every object
 *              within the  namespace.
 *
 *              Currently, the only objects that require initialization are:
 *              1) Methods
 *              2) Op Regions
 *
 ******************************************************************************/

acpi_status
acpi_ds_init_one_object (
	acpi_handle             obj_handle,
	u32                     level,
	void                    *context,
	void                    **return_value)
{
	acpi_object_type8       type;
	acpi_status             status;
	acpi_init_walk_info     *info = (acpi_init_walk_info *) context;
	u8                      table_revision;


	PROC_NAME ("Ds_init_one_object");


	info->object_count++;
	table_revision = info->table_desc->pointer->revision;

	/*
	 * We are only interested in objects owned by the table that
	 * was just loaded
	 */
	if (((acpi_namespace_node *) obj_handle)->owner_id !=
			info->table_desc->table_id) {
		return (AE_OK);
	}


	/* And even then, we are only interested in a few object types */

	type = acpi_ns_get_type (obj_handle);

	switch (type) {

	case ACPI_TYPE_REGION:

		acpi_ds_initialize_region (obj_handle);

		info->op_region_count++;
		break;


	case ACPI_TYPE_METHOD:

		info->method_count++;

		if (!(acpi_dbg_level & ACPI_LV_INIT)) {
			ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK, "."));
		}

		/*
		 * Set the execution data width (32 or 64) based upon the
		 * revision number of the parent ACPI table.
		 */
		if (table_revision == 1) {
			((acpi_namespace_node *)obj_handle)->flags |= ANOBJ_DATA_WIDTH_32;
		}

		/*
		 * Always parse methods to detect errors, we may delete
		 * the parse tree below
		 */
		status = acpi_ds_parse_method (obj_handle);
		if (ACPI_FAILURE (status)) {
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Method %p [%4.4s] - parse failure, %s\n",
				obj_handle, (char*)&((acpi_namespace_node *)obj_handle)->name,
				acpi_format_exception (status)));

			/* This parse failed, but we will continue parsing more methods */

			break;
		}

		/*
		 * Delete the parse tree.  We simple re-parse the method
		 * for every execution since there isn't much overhead
		 */
		acpi_ns_delete_namespace_subtree (obj_handle);
		break;

	default:
		break;
	}

	/*
	 * We ignore errors from above, and always return OK, since
	 * we don't want to abort the walk on a single error.
	 */
	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_initialize_objects
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk the entire namespace and perform any necessary
 *              initialization on the objects found therein
 *
 ******************************************************************************/

acpi_status
acpi_ds_initialize_objects (
	acpi_table_desc         *table_desc,
	acpi_namespace_node     *start_node)
{
	acpi_status             status;
	acpi_init_walk_info     info;


	FUNCTION_TRACE ("Ds_initialize_objects");


	ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
		"**** Starting initialization of namespace objects ****\n"));
	ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK, "Parsing Methods:"));


	info.method_count   = 0;
	info.op_region_count = 0;
	info.object_count   = 0;
	info.table_desc     = table_desc;


	/* Walk entire namespace from the supplied root */

	status = acpi_walk_namespace (ACPI_TYPE_ANY, start_node, ACPI_UINT32_MAX,
			  acpi_ds_init_one_object, &info, NULL);
	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Walk_namespace failed! %x\n", status));
	}

	ACPI_DEBUG_PRINT_RAW ((ACPI_DB_OK,
		"\n%d Control Methods found and parsed (%d nodes total)\n",
		info.method_count, info.object_count));
	ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
		"%d Control Methods found\n", info.method_count));
	ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
		"%d Op Regions found\n", info.op_region_count));

	return_ACPI_STATUS (AE_OK);
}


/*****************************************************************************
 *
 * FUNCTION:    Acpi_ds_init_object_from_op
 *
 * PARAMETERS:  Op              - Parser op used to init the internal object
 *              Opcode          - AML opcode associated with the object
 *              Obj_desc        - Namespace object to be initialized
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize a namespace object from a parser Op and its
 *              associated arguments.  The namespace object is a more compact
 *              representation of the Op and its arguments.
 *
 ****************************************************************************/

acpi_status
acpi_ds_init_object_from_op (
	acpi_walk_state         *walk_state,
	acpi_parse_object       *op,
	u16                     opcode,
	acpi_operand_object     **ret_obj_desc)
{
	acpi_status             status;
	acpi_parse_object       *arg;
	acpi_parse2_object      *byte_list;
	acpi_operand_object     *arg_desc;
	const acpi_opcode_info  *op_info;
	acpi_operand_object     *obj_desc;


	PROC_NAME ("Ds_init_object_from_op");


	obj_desc = *ret_obj_desc;
	op_info = acpi_ps_get_opcode_info (opcode);
	if (op_info->class == AML_CLASS_UNKNOWN) {
		/* Unknown opcode */

		return (AE_TYPE);
	}


	/* Get and prepare the first argument */

	switch (obj_desc->common.type) {
	case ACPI_TYPE_BUFFER:

		/* First arg is a number */

		acpi_ds_create_operand (walk_state, op->value.arg, 0);
		arg_desc = walk_state->operands [walk_state->num_operands - 1];
		acpi_ds_obj_stack_pop (1, walk_state);

		/* Resolve the object (could be an arg or local) */

		status = acpi_ex_resolve_to_value (&arg_desc, walk_state);
		if (ACPI_FAILURE (status)) {
			acpi_ut_remove_reference (arg_desc);
			return (status);
		}

		/* We are expecting a number */

		if (arg_desc->common.type != ACPI_TYPE_INTEGER) {
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"Expecting number, got obj: %p type %X\n",
				arg_desc, arg_desc->common.type));
			acpi_ut_remove_reference (arg_desc);
			return (AE_TYPE);
		}

		/* Get the value, delete the internal object */

		obj_desc->buffer.length = (u32) arg_desc->integer.value;
		acpi_ut_remove_reference (arg_desc);

		/* Allocate the buffer */

		if (obj_desc->buffer.length == 0) {
			obj_desc->buffer.pointer = NULL;
			REPORT_WARNING (("Buffer created with zero length in AML\n"));
			break;
		}

		else {
			obj_desc->buffer.pointer = ACPI_MEM_CALLOCATE (
					   obj_desc->buffer.length);

			if (!obj_desc->buffer.pointer) {
				return (AE_NO_MEMORY);
			}
		}

		/*
		 * Second arg is the buffer data (optional) Byte_list can be either
		 * individual bytes or a string initializer.
		 */
		arg = op->value.arg;         /* skip first arg */

		byte_list = (acpi_parse2_object *) arg->next;
		if (byte_list) {
			if (byte_list->opcode != AML_INT_BYTELIST_OP) {
				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Expecting bytelist, got: %p\n",
					byte_list));
				return (AE_TYPE);
			}

			MEMCPY (obj_desc->buffer.pointer, byte_list->data,
					obj_desc->buffer.length);
		}

		break;


	case ACPI_TYPE_PACKAGE:

		/*
		 * When called, an internal package object has already been built and
		 * is pointed to by Obj_desc. Acpi_ds_build_internal_object builds another
		 * internal package object, so remove reference to the original so
		 * that it is deleted.  Error checking is done within the remove
		 * reference function.
		 */
		acpi_ut_remove_reference (obj_desc);
		status = acpi_ds_build_internal_object (walk_state, op, ret_obj_desc);
		break;

	case ACPI_TYPE_INTEGER:
		obj_desc->integer.value = op->value.integer;
		break;


	case ACPI_TYPE_STRING:
		obj_desc->string.pointer = op->value.string;
		obj_desc->string.length = STRLEN (op->value.string);

		/*
		 * The string is contained in the ACPI table, don't ever try
		 * to delete it
		 */