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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [acpi/] [dispatcher/] [dswstate.c] - Blame information for rev 1275

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/******************************************************************************
 *
 * Module Name: dswstate - Dispatcher parse tree walk management routines
 *
 *****************************************************************************/
 
/*
 * Copyright (C) 2000 - 2004, 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")
 
 
/*******************************************************************************
 *
 * 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);
}
 
 
/*******************************************************************************
 *
 * 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!
 *
 ******************************************************************************/
 
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);
}
 
 
/*******************************************************************************
 *
 * 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.
 *
 ******************************************************************************/
 
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]);
}
 
 
/*******************************************************************************
 *
 * 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)) {
                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,
        union acpi_operand_object       **params,
        union acpi_operand_object       **return_obj_desc,
        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;
        walk_state->params              = params;
        walk_state->caller_return_desc  = return_obj_desc;
 
        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 (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;
}
 
 
/******************************************************************************
 *
 * 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;
}
 
 
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [acpi/] [dispatcher/] [dswstate.c] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix	`/******************************************************************************`
2			`*`
3			`* Module Name: dswstate - Dispatcher parse tree walk management routines`
4			`*`
5			`*****************************************************************************/`
6
7			`/*`
8			`* Copyright (C) 2000 - 2004, R. Byron Moore`
9			`* All rights reserved.`
10			`*`
11			`* Redistribution and use in source and binary forms, with or without`
12			`* modification, are permitted provided that the following conditions`
13			`* are met:`
14			`* 1. Redistributions of source code must retain the above copyright`
15			`* notice, this list of conditions, and the following disclaimer,`
16			`* without modification.`
17			`* 2. Redistributions in binary form must reproduce at minimum a disclaimer`
18			`* substantially similar to the "NO WARRANTY" disclaimer below`
19			`* ("Disclaimer") and any redistribution must be conditioned upon`
20			`* including a substantially similar Disclaimer requirement for further`
21			`* binary redistribution.`
22			`* 3. Neither the names of the above-listed copyright holders nor the names`
23			`* of any contributors may be used to endorse or promote products derived`
24			`* from this software without specific prior written permission.`
25			`*`
26			`* Alternatively, this software may be distributed under the terms of the`
27			`* GNU General Public License ("GPL") version 2 as published by the Free`
28			`* Software Foundation.`
29			`*`
30			`* NO WARRANTY`
31			`* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS`
32			`* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT`
33			`* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR`
34			`* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT`
35			`* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL`
36			`* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS`
37			`* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)`
38			`* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,`
39			`* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING`
40			`* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE`