/******************************************************************************
*
* 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);
}
/* Pop the stack */
walk_state->num_operands--;
/* Check for a valid operand */
if (!walk_state->operands [walk_state->num_operands]) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Null operand! State=%p #Ops=%X\n",
walk_state, walk_state->num_operands));
*object = NULL;
return (AE_AML_NO_OPERAND);
}
/* Get operand and set stack entry to null */
*object = walk_state->operands [walk_state->num_operands];
walk_state->operands [walk_state->num_operands] = NULL;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
*object, acpi_ut_get_object_type_name (*object),
walk_state, walk_state->num_operands));
return (AE_OK);
}
#endif
/*******************************************************************************
*
* FUNCTION: acpi_ds_obj_stack_pop
*
* 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 (
u32 pop_count,
struct acpi_walk_state *walk_state)
{
u32 i;
ACPI_FUNCTION_NAME ("ds_obj_stack_pop");
for (i = 0; i < pop_count; i++) {
/* Check for stack underflow */
if (walk_state->num_operands == 0) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Underflow! Count=%X State=%p #Ops=%X\n",
pop_count, walk_state, walk_state->num_operands));
return (AE_STACK_UNDERFLOW);
}
/* Just set the stack entry to null */
walk_state->num_operands--;
walk_state->operands [walk_state->num_operands] = NULL;
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
pop_count, walk_state, walk_state->num_operands));
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_obj_stack_pop_and_delete
*
* PARAMETERS: pop_count - Number of objects/entries to pop
* walk_state - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Pop this walk's object stack and delete each object that is
* popped off.
*
******************************************************************************/
acpi_status
acpi_ds_obj_stack_pop_and_delete (
u32 pop_count,
struct acpi_walk_state *walk_state)
{
u32 i;
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_NAME ("ds_obj_stack_pop_and_delete");
for (i = 0; i < pop_count; i++) {
/* Check for stack underflow */
if (walk_state->num_operands == 0) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Underflow! Count=%X State=%p #Ops=%X\n",
pop_count, walk_state, walk_state->num_operands));
return (AE_STACK_UNDERFLOW);
}
/* Pop the stack and delete an object if present in this stack entry */
walk_state->num_operands--;
obj_desc = walk_state->operands [walk_state->num_operands];
if (obj_desc) {
acpi_ut_remove_reference (walk_state->operands [walk_state->num_operands]);
walk_state->operands [walk_state->num_operands] = NULL;
}
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
pop_count, walk_state, walk_state->num_operands));
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_obj_stack_get_value
*
* PARAMETERS: Index - Stack index whose value is desired. Based
* on the top of the stack (index=0 == top)
* walk_state - Current Walk state
*
* RETURN: Status
*
* DESCRIPTION: Retrieve an object from this walk's object stack. Index must
* be within the range of the current stack pointer.
*
******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
void *
acpi_ds_obj_stack_get_value (
u32 index,
struct acpi_walk_state *walk_state)
{
ACPI_FUNCTION_TRACE_PTR ("ds_obj_stack_get_value", walk_state);
/* Can't do it if the stack is empty */
if (walk_state->num_operands == 0) {
return_PTR (NULL);
}
/* or if the index is past the top of the stack */
if (index > (walk_state->num_operands - (u32) 1)) {
return_PTR (NULL);
}
return_PTR (walk_state->operands[(acpi_native_uint)(walk_state->num_operands - 1) -
index]);
}
#endif /* ACPI_FUTURE_USAGE */
/*******************************************************************************
*
* FUNCTION: acpi_ds_get_current_walk_state
*
* PARAMETERS: Thread - Get current active state for this Thread
*
* RETURN: Pointer to the current walk state
*
* DESCRIPTION: Get the walk state that is at the head of the list (the "current"
* walk state.)
*
******************************************************************************/
struct acpi_walk_state *
acpi_ds_get_current_walk_state (
struct acpi_thread_state *thread)
{
ACPI_FUNCTION_NAME ("ds_get_current_walk_state");
if (!thread) {
return (NULL);
}
ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Current walk_state %p\n",
thread->walk_state_list));
return (thread->walk_state_list);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_push_walk_state
*
* PARAMETERS: walk_state - State to push
* walk_list - The list that owns the walk stack
*
* RETURN: None
*
* DESCRIPTION: Place the walk_state at the head of the state list.
*
******************************************************************************/
void
acpi_ds_push_walk_state (
struct acpi_walk_state *walk_state,
struct acpi_thread_state *thread)
{
ACPI_FUNCTION_TRACE ("ds_push_walk_state");
walk_state->next = thread->walk_state_list;
thread->walk_state_list = walk_state;
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_pop_walk_state
*
* PARAMETERS: walk_list - The list that owns the walk stack
*
* RETURN: A walk_state object popped from the stack
*
* DESCRIPTION: Remove and return the walkstate object that is at the head of
* the walk stack for the given walk list. NULL indicates that
* the list is empty.
*
******************************************************************************/
struct acpi_walk_state *
acpi_ds_pop_walk_state (
struct acpi_thread_state *thread)
{
struct acpi_walk_state *walk_state;
ACPI_FUNCTION_TRACE ("ds_pop_walk_state");
walk_state = thread->walk_state_list;
if (walk_state) {
/* Next walk state becomes the current walk state */
thread->walk_state_list = walk_state->next;
/*
* Don't clear the NEXT field, this serves as an indicator
* that there is a parent WALK STATE
* NO: walk_state->Next = NULL;
*/
}
return_PTR (walk_state);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_walk_state
*
* PARAMETERS: Origin - Starting point for this walk
* Thread - Current thread state
*
* RETURN: Pointer to the new walk state.
*
* DESCRIPTION: Allocate and initialize a new walk state. The current walk
* state is set to this new state.
*
******************************************************************************/
struct acpi_walk_state *
acpi_ds_create_walk_state (
acpi_owner_id owner_id,
union acpi_parse_object *origin,
union acpi_operand_object *mth_desc,
struct acpi_thread_state *thread)
{
struct acpi_walk_state *walk_state;
acpi_status status;
ACPI_FUNCTION_TRACE ("ds_create_walk_state");
walk_state = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_WALK);
if (!walk_state) {
return_PTR (NULL);
}
walk_state->data_type = ACPI_DESC_TYPE_WALK;
walk_state->owner_id = owner_id;
walk_state->origin = origin;
walk_state->method_desc = mth_desc;
walk_state->thread = thread;
walk_state->parser_state.start_op = origin;
/* Init the method args/local */
#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
acpi_ds_method_data_init (walk_state);
#endif
/* Create an initial result stack entry */
status = acpi_ds_result_stack_push (walk_state);
if (ACPI_FAILURE (status)) {
acpi_ut_release_to_cache (ACPI_MEM_LIST_WALK, walk_state);
return_PTR (NULL);
}
/* Put the new state at the head of the walk list */
if (thread) {
acpi_ds_push_walk_state (walk_state, thread);
}
return_PTR (walk_state);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_init_aml_walk
*
* PARAMETERS: walk_state - New state to be initialized
* Op - Current parse op
* method_node - Control method NS node, if any
* aml_start - Start of AML
* aml_length - Length of AML
* Params - Method args, if any
* return_obj_desc - Where to store a return object, if any
* pass_number - 1, 2, or 3
*
* RETURN: Status
*
* DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
*
******************************************************************************/
acpi_status
acpi_ds_init_aml_walk (
struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
struct acpi_namespace_node *method_node,
u8 *aml_start,
u32 aml_length,
struct acpi_parameter_info *info,
u32 pass_number)
{
acpi_status status;
struct acpi_parse_state *parser_state = &walk_state->parser_state;
union acpi_parse_object *extra_op;
ACPI_FUNCTION_TRACE ("ds_init_aml_walk");
walk_state->parser_state.aml =
walk_state->parser_state.aml_start = aml_start;
walk_state->parser_state.aml_end =
walk_state->parser_state.pkg_end = aml_start + aml_length;
/* The next_op of the next_walk will be the beginning of the method */
walk_state->next_op = NULL;
if (info) {
if (info->parameter_type == ACPI_PARAM_GPE) {
walk_state->gpe_event_info = ACPI_CAST_PTR (struct acpi_gpe_event_info,
info->parameters);
}
else {
walk_state->params = info->parameters;
walk_state->caller_return_desc = &info->return_object;
}
}
status = acpi_ps_init_scope (&walk_state->parser_state, op);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
if (method_node) {
walk_state->parser_state.start_node = method_node;
walk_state->walk_type = ACPI_WALK_METHOD;
walk_state->method_node = method_node;
walk_state->method_desc = acpi_ns_get_attached_object (method_node);
/* Push start scope on scope stack and make it current */
status = acpi_ds_scope_stack_push (method_node, ACPI_TYPE_METHOD, walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Init the method arguments */
status = acpi_ds_method_data_init_args (walk_state->params, ACPI_METHOD_NUM_ARGS, walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
else {
/*
* Setup the current scope.
* Find a Named Op that has a namespace node associated with it.
* search upwards from this Op. Current scope is the first
* Op with a namespace node.
*/
extra_op = parser_state->start_op;
while (extra_op && !extra_op->common.node) {
extra_op = extra_op->common.parent;
}
if (!extra_op) {
parser_state->start_node = NULL;
}
else {
parser_state->start_node = extra_op->common.node;
}
if (parser_state->start_node) {
/* Push start scope on scope stack and make it current */
status = acpi_ds_scope_stack_push (parser_state->start_node,
parser_state->start_node->type, walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
}
status = acpi_ds_init_callbacks (walk_state, pass_number);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_delete_walk_state
*
* PARAMETERS: walk_state - State to delete
*
* RETURN: Status
*
* DESCRIPTION: Delete a walk state including all internal data structures
*
******************************************************************************/
void
acpi_ds_delete_walk_state (
struct acpi_walk_state *walk_state)
{
union acpi_generic_state *state;
ACPI_FUNCTION_TRACE_PTR ("ds_delete_walk_state", walk_state);
if (!walk_state) {
return;
}
if (walk_state->data_type != ACPI_DESC_TYPE_WALK) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%p is not a valid walk state\n", walk_state));
return;
}
if (walk_state->parser_state.scope) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%p walk still has a scope list\n", walk_state));
}
/* Always must free any linked control states */
while (walk_state->control_state) {
state = walk_state->control_state;
walk_state->control_state = state->common.next;
acpi_ut_delete_generic_state (state);
}
/* Always must free any linked parse states */
while (walk_state->scope_info) {
state = walk_state->scope_info;
walk_state->scope_info = state->common.next;
acpi_ut_delete_generic_state (state);
}
/* Always must free any stacked result states */
while (walk_state->results) {
state = walk_state->results;
walk_state->results = state->common.next;
acpi_ut_delete_generic_state (state);
}
acpi_ut_release_to_cache (ACPI_MEM_LIST_WALK, walk_state);
return_VOID;
}
#ifdef ACPI_ENABLE_OBJECT_CACHE
/******************************************************************************
*
* FUNCTION: acpi_ds_delete_walk_state_cache
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Purge the global state object cache. Used during subsystem
* termination.
*
******************************************************************************/
void
acpi_ds_delete_walk_state_cache (
void)
{
ACPI_FUNCTION_TRACE ("ds_delete_walk_state_cache");
acpi_ut_delete_generic_cache (ACPI_MEM_LIST_WALK);
return_VOID;
}
#endif
