dswstate.c

h内核

/******************************************************************************
 *
 * Module Name: dswstate - Dispatcher parse tree walk management routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */


#include <acpi/acpi.h>
#include <acpi/acparser.h>
#include <acpi/acdispat.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_DISPATCHER
	 ACPI_MODULE_NAME    ("dswstate")


#ifdef ACPI_FUTURE_USAGE

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_result_insert
 *
 * PARAMETERS:  Object              - Object to push
 *              Index               - Where to insert the object
 *              walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Insert an object onto this walk's result stack
 *
 ******************************************************************************/

acpi_status
acpi_ds_result_insert (
	void                            *object,
	u32                             index,
	struct acpi_walk_state          *walk_state)
{
	union acpi_generic_state        *state;


	ACPI_FUNCTION_NAME ("ds_result_insert");


	state = walk_state->results;
	if (!state) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No result object pushed! State=%p\n",
			walk_state));
		return (AE_NOT_EXIST);
	}

	if (index >= ACPI_OBJ_NUM_OPERANDS) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Index out of range: %X Obj=%p State=%p Num=%X\n",
			index, object, walk_state, state->results.num_results));
		return (AE_BAD_PARAMETER);
	}

	if (!object) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Null Object! Index=%X Obj=%p State=%p Num=%X\n",
			index, object, walk_state, state->results.num_results));
		return (AE_BAD_PARAMETER);
	}

	state->results.obj_desc [index] = object;
	state->results.num_results++;

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
		"Obj=%p [%s] State=%p Num=%X Cur=%X\n",
		object, object ? acpi_ut_get_object_type_name ((union acpi_operand_object *) object) : "NULL",
		walk_state, state->results.num_results, walk_state->current_result));

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_result_remove
 *
 * PARAMETERS:  Object              - Where to return the popped object
 *              Index               - Where to extract the object
 *              walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop an object off the bottom of this walk's result stack.  In
 *              other words, this is a FIFO.
 *
 ******************************************************************************/

acpi_status
acpi_ds_result_remove (
	union acpi_operand_object       **object,
	u32                             index,
	struct acpi_walk_state          *walk_state)
{
	union acpi_generic_state        *state;


	ACPI_FUNCTION_NAME ("ds_result_remove");


	state = walk_state->results;
	if (!state) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No result object pushed! State=%p\n",
			walk_state));
		return (AE_NOT_EXIST);
	}

	if (index >= ACPI_OBJ_MAX_OPERAND) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Index out of range: %X State=%p Num=%X\n",
			index, walk_state, state->results.num_results));
	}

	/* Check for a valid result object */

	if (!state->results.obj_desc [index]) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Null operand! State=%p #Ops=%X, Index=%X\n",
			walk_state, state->results.num_results, index));
		return (AE_AML_NO_RETURN_VALUE);
	}

	/* Remove the object */

	state->results.num_results--;

	*object = state->results.obj_desc [index];
	state->results.obj_desc [index] = NULL;

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
		"Obj=%p [%s] Index=%X State=%p Num=%X\n",
		*object, (*object) ? acpi_ut_get_object_type_name (*object) : "NULL",
		index, walk_state, state->results.num_results));

	return (AE_OK);
}

#endif  /*  ACPI_FUTURE_USAGE  */


/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_result_pop
 *
 * PARAMETERS:  Object              - Where to return the popped object
 *              walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop an object off the bottom of this walk's result stack.  In
 *              other words, this is a FIFO.
 *
 ******************************************************************************/

acpi_status
acpi_ds_result_pop (
	union acpi_operand_object       **object,
	struct acpi_walk_state          *walk_state)
{
	acpi_native_uint                index;
	union acpi_generic_state        *state;


	ACPI_FUNCTION_NAME ("ds_result_pop");


	state = walk_state->results;
	if (!state) {
		return (AE_OK);
	}

	if (!state->results.num_results) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Result stack is empty! State=%p\n",
			walk_state));
		return (AE_AML_NO_RETURN_VALUE);
	}

	/* Remove top element */

	state->results.num_results--;

	for (index = ACPI_OBJ_NUM_OPERANDS; index; index--) {
		/* Check for a valid result object */

		if (state->results.obj_desc [index -1]) {
			*object = state->results.obj_desc [index -1];
			state->results.obj_desc [index -1] = NULL;

			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] Index=%X State=%p Num=%X\n",
				*object, (*object) ? acpi_ut_get_object_type_name (*object) : "NULL",
				(u32) index -1, walk_state, state->results.num_results));

			return (AE_OK);
		}
	}

	ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No result objects! State=%p\n", walk_state));
	return (AE_AML_NO_RETURN_VALUE);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_result_pop_from_bottom
 *
 * PARAMETERS:  Object              - Where to return the popped object
 *              walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop an object off the bottom of this walk's result stack.  In
 *              other words, this is a FIFO.
 *
 ******************************************************************************/

acpi_status
acpi_ds_result_pop_from_bottom (
	union acpi_operand_object       **object,
	struct acpi_walk_state          *walk_state)
{
	acpi_native_uint                index;
	union acpi_generic_state        *state;


	ACPI_FUNCTION_NAME ("ds_result_pop_from_bottom");


	state = walk_state->results;
	if (!state) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Warning: No result object pushed! State=%p\n", walk_state));
		return (AE_NOT_EXIST);
	}

	if (!state->results.num_results) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No result objects! State=%p\n", walk_state));
		return (AE_AML_NO_RETURN_VALUE);
	}

	/* Remove Bottom element */

	*object = state->results.obj_desc [0];

	/* Push entire stack down one element */

	for (index = 0; index < state->results.num_results; index++) {
		state->results.obj_desc [index] = state->results.obj_desc [index + 1];
	}

	state->results.num_results--;

	/* Check for a valid result object */

	if (!*object) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null operand! State=%p #Ops=%X, Index=%X\n",
			walk_state, state->results.num_results, (u32) index));
		return (AE_AML_NO_RETURN_VALUE);
	}

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s], Results=%p State=%p\n",
		*object, (*object) ? acpi_ut_get_object_type_name (*object) : "NULL",
		state, walk_state));

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_result_push
 *
 * PARAMETERS:  Object              - Where to return the popped object
 *              walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Push an object onto the current result stack
 *
 ******************************************************************************/

acpi_status
acpi_ds_result_push (
	union acpi_operand_object       *object,
	struct acpi_walk_state          *walk_state)
{
	union acpi_generic_state        *state;


	ACPI_FUNCTION_NAME ("ds_result_push");


	state = walk_state->results;
	if (!state) {
		ACPI_REPORT_ERROR (("No result stack frame during push\n"));
		return (AE_AML_INTERNAL);
	}

	if (state->results.num_results == ACPI_OBJ_NUM_OPERANDS) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Result stack overflow: Obj=%p State=%p Num=%X\n",
			object, walk_state, state->results.num_results));
		return (AE_STACK_OVERFLOW);
	}

	if (!object) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null Object! Obj=%p State=%p Num=%X\n",
			object, walk_state, state->results.num_results));
		return (AE_BAD_PARAMETER);
	}

	state->results.obj_desc [state->results.num_results] = object;
	state->results.num_results++;

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
		object, object ? acpi_ut_get_object_type_name ((union acpi_operand_object *) object) : "NULL",
		walk_state, state->results.num_results, walk_state->current_result));

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_result_stack_push
 *
 * PARAMETERS:  walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Push an object onto the walk_state result stack.
 *
 ******************************************************************************/

acpi_status
acpi_ds_result_stack_push (
	struct acpi_walk_state          *walk_state)
{
	union acpi_generic_state        *state;

	ACPI_FUNCTION_NAME ("ds_result_stack_push");


	state = acpi_ut_create_generic_state ();
	if (!state) {
		return (AE_NO_MEMORY);
	}

	state->common.data_type = ACPI_DESC_TYPE_STATE_RESULT;
	acpi_ut_push_generic_state (&walk_state->results, state);

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Results=%p State=%p\n",
		state, walk_state));

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_result_stack_pop
 *
 * PARAMETERS:  walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop an object off of the walk_state result stack.
 *
 ******************************************************************************/

acpi_status
acpi_ds_result_stack_pop (
	struct acpi_walk_state          *walk_state)
{
	union acpi_generic_state        *state;

	ACPI_FUNCTION_NAME ("ds_result_stack_pop");


	/* Check for stack underflow */

	if (walk_state->results == NULL) {
		ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Underflow - State=%p\n",
			walk_state));
		return (AE_AML_NO_OPERAND);
	}

	state = acpi_ut_pop_generic_state (&walk_state->results);

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
		"Result=%p remaining_results=%X State=%p\n",
		state, state->results.num_results, walk_state));

	acpi_ut_delete_generic_state (state);

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_obj_stack_delete_all
 *
 * PARAMETERS:  walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear the object stack by deleting all objects that are on it.
 *              Should be used with great care, if at all!
 *
 ******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_ds_obj_stack_delete_all (
	struct acpi_walk_state          *walk_state)
{
	u32                             i;


	ACPI_FUNCTION_TRACE_PTR ("ds_obj_stack_delete_all", walk_state);


	/* The stack size is configurable, but fixed */

	for (i = 0; i < ACPI_OBJ_NUM_OPERANDS; i++) {
		if (walk_state->operands[i]) {
			acpi_ut_remove_reference (walk_state->operands[i]);
			walk_state->operands[i] = NULL;
		}
	}

	return_ACPI_STATUS (AE_OK);
}
#endif  /*  ACPI_FUTURE_USAGE  */


/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_obj_stack_push
 *
 * PARAMETERS:  Object              - Object to push
 *              walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Push an object onto this walk's object/operand stack
 *
 ******************************************************************************/

acpi_status
acpi_ds_obj_stack_push (
	void                            *object,
	struct acpi_walk_state          *walk_state)
{
	ACPI_FUNCTION_NAME ("ds_obj_stack_push");


	/* Check for stack overflow */

	if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"overflow! Obj=%p State=%p #Ops=%X\n",
			object, walk_state, walk_state->num_operands));
		return (AE_STACK_OVERFLOW);
	}

	/* Put the object onto the stack */

	walk_state->operands [walk_state->num_operands] = object;
	walk_state->num_operands++;

	ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
			  object, acpi_ut_get_object_type_name ((union acpi_operand_object *) object),
			  walk_state, walk_state->num_operands));

	return (AE_OK);
}


#if 0
/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_obj_stack_pop_object
 *
 * PARAMETERS:  pop_count           - Number of objects/entries to pop
 *              walk_state          - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop this walk's object stack.  Objects on the stack are NOT
 *              deleted by this routine.
 *
 ******************************************************************************/

acpi_status
acpi_ds_obj_stack_pop_object (
	union acpi_operand_object       **object,
	struct acpi_walk_state          *walk_state)
{
	ACPI_FUNCTION_NAME ("ds_obj_stack_pop_object");


	/* Check for stack underflow */

	if (walk_state->num_operands == 0) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Missing operand/stack empty! State=%p #Ops=%X\n",
			walk_state, walk_state->num_operands));
		*object = NULL;
		return (AE_AML_NO_OPERAND);
	}