/******************************************************************************
*
* Module Name: dswstate - Dispatcher parse tree walk management routines
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2008, Intel Corp.
* 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 "accommon.h"
#include "acparser.h"
#include "acdispat.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_DISPATCHER
ACPI_MODULE_NAME("dswstate")
/* Local prototypes */
static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *ws);
static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *ws);
/*******************************************************************************
*
* 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 top of this walk's result stack
*
******************************************************************************/
acpi_status
acpi_ds_result_pop(union acpi_operand_object **object,
struct acpi_walk_state *walk_state)
{
u32 index;
union acpi_generic_state *state;
acpi_status status;
ACPI_FUNCTION_NAME(ds_result_pop);
state = walk_state->results;
/* Incorrect state of result stack */
if (state && !walk_state->result_count) {
ACPI_ERROR((AE_INFO, "No results on result stack"));
return (AE_AML_INTERNAL);
}
if (!state && walk_state->result_count) {
ACPI_ERROR((AE_INFO, "No result state for result stack"));
return (AE_AML_INTERNAL);
}
/* Empty result stack */
if (!state) {
ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p",
walk_state));
return (AE_AML_NO_RETURN_VALUE);
}
/* Return object of the top element and clean that top element result stack */
walk_state->result_count--;
index = walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
*object = state->results.obj_desc[index];
if (!*object) {
ACPI_ERROR((AE_INFO,
"No result objects on result stack, State=%p",
walk_state));
return (AE_AML_NO_RETURN_VALUE);
}
state->results.obj_desc[index] = NULL;
if (index == 0) {
status = acpi_ds_result_stack_pop(walk_state);
if (ACPI_FAILURE(status)) {
return (status);
}
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Obj=%p [%s] Index=%X State=%p Num=%X\n", *object,
acpi_ut_get_object_type_name(*object),
index, walk_state, walk_state->result_count));
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_status status;
u32 index;
ACPI_FUNCTION_NAME(ds_result_push);
if (walk_state->result_count > walk_state->result_size) {
ACPI_ERROR((AE_INFO, "Result stack is full"));
return (AE_AML_INTERNAL);
} else if (walk_state->result_count == walk_state->result_size) {
/* Extend the result stack */
status = acpi_ds_result_stack_push(walk_state);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO,
"Failed to extend the result stack"));
return (status);
}
}
if (!(walk_state->result_count < walk_state->result_size)) {
ACPI_ERROR((AE_INFO, "No free elements in result stack"));
return (AE_AML_INTERNAL);
}
state = walk_state->results;
if (!state) {
ACPI_ERROR((AE_INFO, "No result stack frame during push"));
return (AE_AML_INTERNAL);
}
if (!object) {
ACPI_ERROR((AE_INFO,
"Null Object! Obj=%p State=%p Num=%X",
object, walk_state, walk_state->result_count));
return (AE_BAD_PARAMETER);
}
/* Assign the address of object to the top free element of result stack */
index = walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
state->results.obj_desc[index] = object;
walk_state->result_count++;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
object,
acpi_ut_get_object_type_name((union
acpi_operand_object *)
object), walk_state,
walk_state->result_count,
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
*
******************************************************************************/
static 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);
/* Check for stack overflow */
if (((u32) walk_state->result_size + ACPI_RESULTS_FRAME_OBJ_NUM) >
ACPI_RESULTS_OBJ_NUM_MAX) {
ACPI_ERROR((AE_INFO, "Result stack overflow: State=%p Num=%X",
walk_state, walk_state->result_size));
return (AE_STACK_OVERFLOW);
}
state = acpi_ut_create_generic_state();
if (!state) {
return (AE_NO_MEMORY);
}
state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT;
acpi_ut_push_generic_state(&walk_state->results, state);
/* Increase the length of the result stack by the length of frame */
walk_state->result_size += ACPI_RESULTS_FRAME_OBJ_NUM;
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
*
******************************************************************************/
static 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,
"Result stack underflow - State=%p\n",
walk_state));
return (AE_AML_NO_OPERAND);
}
if (walk_state->result_size < ACPI_RESULTS_FRAME_OBJ_NUM) {
ACPI_ERROR((AE_INFO, "Insufficient result stack size"));
return (AE_AML_INTERNAL);
}
state = acpi_ut_pop_generic_state(&walk_state->results);
acpi_ut_delete_generic_state(state);
/* Decrease the length of result stack by the length of frame */
walk_state->result_size -= ACPI_RESULTS_FRAME_OBJ_NUM;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Result=%p RemainingResults=%X State=%p\n",
state, walk_state->result_count, walk_state));
return (AE_OK);
}
/*******************************************************************************
*
* 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_ERROR((AE_INFO,
"Object stack overflow! Obj=%p State=%p #Ops=%X",
object, walk_state, walk_state->num_operands));
return (AE_STACK_OVERFLOW);
}
/* Put the object onto the stack */
walk_state->operands[walk_state->operand_index] = object;
walk_state->num_operands++;
/* For the usual order of filling the operand stack */
walk_state->operand_index++;
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);
}
/*******************************************************************************
*
* 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_ERROR((AE_INFO,
"Object stack underflow! Count=%X State=%p #Ops=%X",
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.
*
******************************************************************************/
void
acpi_ds_obj_stack_pop_and_delete(u32 pop_count,
struct acpi_walk_state *walk_state)
{
s32 i;
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete);
if (pop_count == 0) {
return;
}
for (i = (s32) pop_count - 1; i >= 0; i--) {
if (walk_state->num_operands == 0) {
return;
}
/* Pop the stack and delete an object if present in this stack entry */
walk_state->num_operands--;
obj_desc = walk_state->operands[i];
if (obj_desc) {
acpi_ut_remove_reference(walk_state->operands[i]);
walk_state->operands[i] = NULL;
}
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
pop_count, walk_state, walk_state->num_operands));
}
/*******************************************************************************
*
* 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 WalkState %p\n",
thread->walk_state_list));
return (thread->walk_state_list);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_push_walk_state
*
* PARAMETERS: walk_state - State to push
* Thread - Thread state object
*
* RETURN: None
*
* DESCRIPTION: Place the Thread 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: Thread - Current thread state
*
* RETURN: A walk_state object popped from the thread's 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
* Do Not: walk_state->Next = NULL;
*/
}
return_PTR(walk_state);
}
/*******************************************************************************
*
* FUNCTION: acpi_ds_create_walk_state
*
* PARAMETERS: owner_id - ID for object creation
* Origin - Starting point for this walk
* method_desc - Method object
* 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
*method_desc, struct acpi_thread_state
*thread)
{
struct acpi_walk_state *walk_state;
ACPI_FUNCTION_TRACE(ds_create_walk_state);
walk_state = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_walk_state));
if (!walk_state) {
return_PTR(NULL);
}
walk_state->descriptor_type = ACPI_DESC_TYPE_WALK;
walk_state->method_desc = method_desc;
walk_state->owner_id = owner_id;
walk_state->origin = origin;
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
/* 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
* Info - Method info block (params, etc.)
* 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_evaluate_info *info, u8 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;
walk_state->pass_number = pass_number;
if (info) {
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->descriptor_type != ACPI_DESC_TYPE_WALK) {
ACPI_ERROR((AE_INFO, "%p is not a valid walk state",
walk_state));
return;
}
/* There should not be any open scopes */
if (walk_state->parser_state.scope) {
ACPI_ERROR((AE_INFO, "%p walk still has a scope list",
walk_state));
acpi_ps_cleanup_scope(&walk_state->parser_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_FREE(walk_state);
return_VOID;
}
