dsmthdat.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: dsmthdat - control method arguments and local variables
 *              $Revision: 49 $
 *
 ******************************************************************************/

/*
 *  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 "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"


#define _COMPONENT          ACPI_DISPATCHER
	 MODULE_NAME         ("dsmthdat")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_init
 *
 * PARAMETERS:  Walk_state          - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize the data structures that hold the method's arguments
 *              and locals.  The data struct is an array of NTEs for each.
 *              This allows Ref_of and De_ref_of to work properly for these
 *              special data types.
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_init (
	acpi_walk_state         *walk_state)
{
	u32                     i;


	FUNCTION_TRACE ("Ds_method_data_init");

	/*
	 * Walk_state fields are initialized to zero by the
	 * ACPI_MEM_CALLOCATE().
	 *
	 * An Node is assigned to each argument and local so
	 * that Ref_of() can return a pointer to the Node.
	 */

	/* Init the method arguments */

	for (i = 0; i < MTH_NUM_ARGS; i++) {
		MOVE_UNALIGNED32_TO_32 (&walk_state->arguments[i].name,
				 NAMEOF_ARG_NTE);
		walk_state->arguments[i].name      |= (i << 24);
		walk_state->arguments[i].data_type  = ACPI_DESC_TYPE_NAMED;
		walk_state->arguments[i].type       = ACPI_TYPE_ANY;
		walk_state->arguments[i].flags      = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG;
	}

	/* Init the method locals */

	for (i = 0; i < MTH_NUM_LOCALS; i++) {
		MOVE_UNALIGNED32_TO_32 (&walk_state->local_variables[i].name,
				 NAMEOF_LOCAL_NTE);

		walk_state->local_variables[i].name  |= (i << 24);
		walk_state->local_variables[i].data_type = ACPI_DESC_TYPE_NAMED;
		walk_state->local_variables[i].type   = ACPI_TYPE_ANY;
		walk_state->local_variables[i].flags  = ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL;
	}

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_delete_all
 *
 * PARAMETERS:  Walk_state          - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete method locals and arguments.  Arguments are only
 *              deleted if this method was called from another method.
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_delete_all (
	acpi_walk_state         *walk_state)
{
	u32                     index;
	acpi_operand_object     *object;


	FUNCTION_TRACE ("Ds_method_data_delete_all");


	/* Delete the locals */

	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting local variables in %p\n", walk_state));

	for (index = 0; index < MTH_NUM_LOCALS; index++) {
		object = walk_state->local_variables[index].object;
		if (object) {
			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n", index, object));

			/* Remove first */

			walk_state->local_variables[index].object = NULL;

			/* Was given a ref when stored */

			acpi_ut_remove_reference (object);
	   }
	}


	/* Delete the arguments */

	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting arguments in %p\n", walk_state));

	for (index = 0; index < MTH_NUM_ARGS; index++) {
		object = walk_state->arguments[index].object;
		if (object) {
			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n", index, object));

			/* Remove first */

			walk_state->arguments[index].object = NULL;

			 /* Was given a ref when stored */

			acpi_ut_remove_reference (object);
		}
	}

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_init_args
 *
 * PARAMETERS:  *Params         - Pointer to a parameter list for the method
 *              Max_param_count - The arg count for this method
 *              Walk_state      - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize arguments for a method
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_init_args (
	acpi_operand_object     **params,
	u32                     max_param_count,
	acpi_walk_state         *walk_state)
{
	acpi_status             status;
	u32                     mindex;
	u32                     pindex;


	FUNCTION_TRACE_PTR ("Ds_method_data_init_args", params);


	if (!params) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n"));
		return_ACPI_STATUS (AE_OK);
	}

	/* Copy passed parameters into the new method stack frame  */

	for (pindex = mindex = 0;
		(mindex < MTH_NUM_ARGS) && (pindex < max_param_count);
		mindex++) {
		if (params[pindex]) {
			/*
			 * A valid parameter.
			 * Set the current method argument to the
			 * Params[Pindex++] argument object descriptor
			 */
			status = acpi_ds_store_object_to_local (AML_ARG_OP, mindex,
					  params[pindex], walk_state);
			if (ACPI_FAILURE (status)) {
				break;
			}

			pindex++;
		}

		else {
			break;
		}
	}

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", pindex));
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_get_entry
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which local_var or argument to get
 *              Entry               - Pointer to where a pointer to the stack
 *                                    entry is returned.
 *              Walk_state          - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the address of the object entry given by Opcode:Index
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_get_entry (
	u16                     opcode,
	u32                     index,
	acpi_walk_state         *walk_state,
	acpi_operand_object     ***entry)
{

	FUNCTION_TRACE_U32 ("Ds_method_data_get_entry", index);


	/*
	 * Get the requested object.
	 * The stack "Opcode" is either a Local_variable or an Argument
	 */
	switch (opcode) {

	case AML_LOCAL_OP:

		if (index > MTH_MAX_LOCAL) {
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Local_var index %d is invalid (max %d)\n",
				index, MTH_MAX_LOCAL));
			return_ACPI_STATUS (AE_BAD_PARAMETER);
		}

		*entry = (acpi_operand_object  **)
				 &walk_state->local_variables[index].object;
		break;


	case AML_ARG_OP:

		if (index > MTH_MAX_ARG) {
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Arg index %d is invalid (max %d)\n",
				index, MTH_MAX_ARG));
			return_ACPI_STATUS (AE_BAD_PARAMETER);
		}

		*entry = (acpi_operand_object  **)
				 &walk_state->arguments[index].object;
		break;


	default:
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Opcode %d is invalid\n", opcode));
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}


	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_set_entry
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which local_var or argument to get
 *              Object              - Object to be inserted into the stack entry
 *              Walk_state          - Current walk state object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
 *
 ******************************************************************************/

acpi_status
acpi_ds_method_data_set_entry (
	u16                     opcode,
	u32                     index,
	acpi_operand_object     *object,
	acpi_walk_state         *walk_state)
{
	acpi_status             status;
	acpi_operand_object     **entry;


	FUNCTION_TRACE ("Ds_method_data_set_entry");


	/* Get a pointer to the stack entry to set */

	status = acpi_ds_method_data_get_entry (opcode, index, walk_state, &entry);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/* Increment ref count so object can't be deleted while installed */

	acpi_ut_add_reference (object);

	/* Install the object into the stack entry */

	*entry = object;

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ds_method_data_get_type
 *
 * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
 *              Index               - Which local_var or argument whose type
 *                                      to get
 *              Walk_state          - Current walk state object
 *
 * RETURN:      Data type of selected Arg or Local
 *              Used only in Exec_monadic2()/Type_op.
 *
 ******************************************************************************/

acpi_object_type8
acpi_ds_method_data_get_type (
	u16                     opcode,
	u32                     index,
	acpi_walk_state         *walk_state)
{
	acpi_status             status;
	acpi_operand_object     **entry;
	acpi_operand_object     *object;


	FUNCTION_TRACE ("Ds_method_data_get_type");


	/* Get a pointer to the requested stack entry */

	status = acpi_ds_method_data_get_entry (opcode, index, walk_state, &entry);