/drivers/acpi/dispatcher/dswstate.c
https://bitbucket.org/evzijst/gittest · C · 1100 lines · 513 code · 248 blank · 339 comment · 65 complexity · 2d3ae675920818f6e99835c44c34e97b MD5 · raw file
- /******************************************************************************
- *
- * 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