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158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/******************************************************************************
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*
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* Module Name: dswscope - Scope stack manipulation
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* $Revision: 1.1 $
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000, 2001 R. Byron Moore
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <acpi.h>
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#define _COMPONENT ACPI_DISPATCHER
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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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ACPI_WALK_STATE *walk_state)
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{
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ACPI_GENERIC_STATE *scope_info;
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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_cm_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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ACPI_NAMESPACE_NODE *node,
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OBJECT_TYPE_INTERNAL type,
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ACPI_WALK_STATE *walk_state)
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{
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ACPI_GENERIC_STATE *scope_info;
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if (!node) {
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/* invalid scope */
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REPORT_ERROR (("Ds_scope_stack_push: null scope passed\n"));
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return (AE_BAD_PARAMETER);
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}
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/* Make sure object type is valid */
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if (!acpi_aml_validate_object_type (type)) {
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REPORT_WARNING (("Ds_scope_stack_push: type code out of range\n"));
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}
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/* Allocate a new scope object */
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scope_info = acpi_cm_create_generic_state ();
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if (!scope_info) {
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return (AE_NO_MEMORY);
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}
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/* Init new scope object */
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scope_info->scope.node = node;
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scope_info->common.value = (u16) type;
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/* Push new scope object onto stack */
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acpi_cm_push_generic_state (&walk_state->scope_info, scope_info);
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return (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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ACPI_WALK_STATE *walk_state)
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{
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ACPI_GENERIC_STATE *scope_info;
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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_cm_pop_generic_state (&walk_state->scope_info);
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if (!scope_info) {
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return (AE_STACK_UNDERFLOW);
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}
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acpi_cm_delete_generic_state (scope_info);
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return (AE_OK);
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}
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