230 lines
6.9 KiB
C
230 lines
6.9 KiB
C
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/******************************************************************************
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*
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* Module Name: dswscope - Scope stack manipulation
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acdispat.h>
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#define _COMPONENT ACPI_DISPATCHER
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ACPI_MODULE_NAME ("dswscope")
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#define STACK_POP(head) head
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/****************************************************************************
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*
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* FUNCTION: acpi_ds_scope_stack_clear
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*
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* PARAMETERS: None
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*
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* DESCRIPTION: Pop (and free) everything on the scope stack except the
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* root scope object (which remains at the stack top.)
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*
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***************************************************************************/
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void
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acpi_ds_scope_stack_clear (
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struct acpi_walk_state *walk_state)
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{
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union acpi_generic_state *scope_info;
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ACPI_FUNCTION_NAME ("ds_scope_stack_clear");
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while (walk_state->scope_info) {
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/* Pop a scope off the stack */
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scope_info = walk_state->scope_info;
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walk_state->scope_info = scope_info->scope.next;
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
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"Popped object type (%s)\n", acpi_ut_get_type_name (scope_info->common.value)));
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acpi_ut_delete_generic_state (scope_info);
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}
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}
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/****************************************************************************
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*
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* FUNCTION: acpi_ds_scope_stack_push
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*
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* PARAMETERS: *Node, - Name to be made current
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* Type, - Type of frame being pushed
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*
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* DESCRIPTION: Push the current scope on the scope stack, and make the
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* passed Node current.
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*
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***************************************************************************/
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acpi_status
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acpi_ds_scope_stack_push (
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struct acpi_namespace_node *node,
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acpi_object_type type,
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struct acpi_walk_state *walk_state)
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{
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union acpi_generic_state *scope_info;
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union acpi_generic_state *old_scope_info;
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ACPI_FUNCTION_TRACE ("ds_scope_stack_push");
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if (!node) {
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/* Invalid scope */
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ACPI_REPORT_ERROR (("ds_scope_stack_push: null scope passed\n"));
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* Make sure object type is valid */
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if (!acpi_ut_valid_object_type (type)) {
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ACPI_REPORT_WARNING (("ds_scope_stack_push: Invalid object type: 0x%X\n", type));
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}
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/* Allocate a new scope object */
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scope_info = acpi_ut_create_generic_state ();
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if (!scope_info) {
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return_ACPI_STATUS (AE_NO_MEMORY);
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}
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/* Init new scope object */
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scope_info->common.data_type = ACPI_DESC_TYPE_STATE_WSCOPE;
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scope_info->scope.node = node;
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scope_info->common.value = (u16) type;
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walk_state->scope_depth++;
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
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"[%.2d] Pushed scope ", (u32) walk_state->scope_depth));
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old_scope_info = walk_state->scope_info;
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if (old_scope_info) {
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ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
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"[%4.4s] (%s)",
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acpi_ut_get_node_name (old_scope_info->scope.node),
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acpi_ut_get_type_name (old_scope_info->common.value)));
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}
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else {
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ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
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"[\\___] (%s)", "ROOT"));
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}
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ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
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", New scope -> [%4.4s] (%s)\n",
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acpi_ut_get_node_name (scope_info->scope.node),
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acpi_ut_get_type_name (scope_info->common.value)));
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/* Push new scope object onto stack */
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acpi_ut_push_generic_state (&walk_state->scope_info, scope_info);
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return_ACPI_STATUS (AE_OK);
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}
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/****************************************************************************
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*
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* FUNCTION: acpi_ds_scope_stack_pop
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*
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* PARAMETERS: Type - The type of frame to be found
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*
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* DESCRIPTION: Pop the scope stack until a frame of the requested type
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* is found.
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*
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* RETURN: Count of frames popped. If no frame of the requested type
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* was found, the count is returned as a negative number and
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* the scope stack is emptied (which sets the current scope
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* to the root). If the scope stack was empty at entry, the
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* function is a no-op and returns 0.
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*
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***************************************************************************/
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acpi_status
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acpi_ds_scope_stack_pop (
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struct acpi_walk_state *walk_state)
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{
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union acpi_generic_state *scope_info;
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union acpi_generic_state *new_scope_info;
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ACPI_FUNCTION_TRACE ("ds_scope_stack_pop");
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/*
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* Pop scope info object off the stack.
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*/
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scope_info = acpi_ut_pop_generic_state (&walk_state->scope_info);
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if (!scope_info) {
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return_ACPI_STATUS (AE_STACK_UNDERFLOW);
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}
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walk_state->scope_depth--;
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ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
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"[%.2d] Popped scope [%4.4s] (%s), New scope -> ",
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(u32) walk_state->scope_depth,
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acpi_ut_get_node_name (scope_info->scope.node),
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acpi_ut_get_type_name (scope_info->common.value)));
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new_scope_info = walk_state->scope_info;
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if (new_scope_info) {
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ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
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"[%4.4s] (%s)\n",
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acpi_ut_get_node_name (new_scope_info->scope.node),
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acpi_ut_get_type_name (new_scope_info->common.value)));
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}
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else {
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ACPI_DEBUG_PRINT_RAW ((ACPI_DB_EXEC,
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"[\\___] (ROOT)\n"));
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}
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acpi_ut_delete_generic_state (scope_info);
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return_ACPI_STATUS (AE_OK);
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}
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