312 lines
8.9 KiB
C
312 lines
8.9 KiB
C
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/*******************************************************************************
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*
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* Module Name: utstate - state object support procedures
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2017, Intel Corp.
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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 "accommon.h"
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME("utstate")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_push_generic_state
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*
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* PARAMETERS: list_head - Head of the state stack
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* state - State object to push
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*
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* RETURN: None
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*
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* DESCRIPTION: Push a state object onto a state stack
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*
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******************************************************************************/
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void
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acpi_ut_push_generic_state(union acpi_generic_state **list_head,
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union acpi_generic_state *state)
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{
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ACPI_FUNCTION_ENTRY();
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/* Push the state object onto the front of the list (stack) */
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state->common.next = *list_head;
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*list_head = state;
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return;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_pop_generic_state
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*
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* PARAMETERS: list_head - Head of the state stack
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*
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* RETURN: The popped state object
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*
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* DESCRIPTION: Pop a state object from a state stack
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*
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******************************************************************************/
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union acpi_generic_state *acpi_ut_pop_generic_state(union acpi_generic_state
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**list_head)
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{
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union acpi_generic_state *state;
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ACPI_FUNCTION_ENTRY();
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/* Remove the state object at the head of the list (stack) */
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state = *list_head;
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if (state) {
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/* Update the list head */
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*list_head = state->common.next;
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}
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return (state);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_create_generic_state
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*
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* PARAMETERS: None
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*
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* RETURN: The new state object. NULL on failure.
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*
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* DESCRIPTION: Create a generic state object. Attempt to obtain one from
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* the global state cache; If none available, create a new one.
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*
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******************************************************************************/
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union acpi_generic_state *acpi_ut_create_generic_state(void)
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{
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union acpi_generic_state *state;
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ACPI_FUNCTION_ENTRY();
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state = acpi_os_acquire_object(acpi_gbl_state_cache);
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if (state) {
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/* Initialize */
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state->common.descriptor_type = ACPI_DESC_TYPE_STATE;
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}
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return (state);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_create_thread_state
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*
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* PARAMETERS: None
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*
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* RETURN: New Thread State. NULL on failure
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*
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* DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
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* to track per-thread info during method execution
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*
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******************************************************************************/
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struct acpi_thread_state *acpi_ut_create_thread_state(void)
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{
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union acpi_generic_state *state;
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ACPI_FUNCTION_ENTRY();
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/* Create the generic state object */
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state = acpi_ut_create_generic_state();
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if (!state) {
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return (NULL);
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}
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/* Init fields specific to the update struct */
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state->common.descriptor_type = ACPI_DESC_TYPE_STATE_THREAD;
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state->thread.thread_id = acpi_os_get_thread_id();
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/* Check for invalid thread ID - zero is very bad, it will break things */
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if (!state->thread.thread_id) {
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ACPI_ERROR((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
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state->thread.thread_id = (acpi_thread_id) 1;
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}
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return ((struct acpi_thread_state *)state);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_create_update_state
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*
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* PARAMETERS: object - Initial Object to be installed in the state
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* action - Update action to be performed
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*
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* RETURN: New state object, null on failure
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*
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* DESCRIPTION: Create an "Update State" - a flavor of the generic state used
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* to update reference counts and delete complex objects such
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* as packages.
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*
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******************************************************************************/
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union acpi_generic_state *acpi_ut_create_update_state(union acpi_operand_object
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*object, u16 action)
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{
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union acpi_generic_state *state;
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ACPI_FUNCTION_ENTRY();
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/* Create the generic state object */
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state = acpi_ut_create_generic_state();
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if (!state) {
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return (NULL);
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}
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/* Init fields specific to the update struct */
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state->common.descriptor_type = ACPI_DESC_TYPE_STATE_UPDATE;
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state->update.object = object;
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state->update.value = action;
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return (state);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_create_pkg_state
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*
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* PARAMETERS: object - Initial Object to be installed in the state
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* action - Update action to be performed
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*
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* RETURN: New state object, null on failure
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*
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* DESCRIPTION: Create a "Package State"
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*
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******************************************************************************/
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union acpi_generic_state *acpi_ut_create_pkg_state(void *internal_object,
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void *external_object,
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u32 index)
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{
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union acpi_generic_state *state;
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ACPI_FUNCTION_ENTRY();
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/* Create the generic state object */
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state = acpi_ut_create_generic_state();
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if (!state) {
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return (NULL);
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}
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/* Init fields specific to the update struct */
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state->common.descriptor_type = ACPI_DESC_TYPE_STATE_PACKAGE;
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state->pkg.source_object = (union acpi_operand_object *)internal_object;
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state->pkg.dest_object = external_object;
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state->pkg.index = index;
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state->pkg.num_packages = 1;
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return (state);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_create_control_state
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*
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* PARAMETERS: None
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*
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* RETURN: New state object, null on failure
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*
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* DESCRIPTION: Create a "Control State" - a flavor of the generic state used
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* to support nested IF/WHILE constructs in the AML.
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*
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******************************************************************************/
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union acpi_generic_state *acpi_ut_create_control_state(void)
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{
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union acpi_generic_state *state;
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ACPI_FUNCTION_ENTRY();
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/* Create the generic state object */
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state = acpi_ut_create_generic_state();
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if (!state) {
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return (NULL);
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}
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/* Init fields specific to the control struct */
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state->common.descriptor_type = ACPI_DESC_TYPE_STATE_CONTROL;
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state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING;
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return (state);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_delete_generic_state
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*
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* PARAMETERS: state - The state object to be deleted
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*
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* RETURN: None
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*
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* DESCRIPTION: Release a state object to the state cache. NULL state objects
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* are ignored.
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*
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******************************************************************************/
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void acpi_ut_delete_generic_state(union acpi_generic_state *state)
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{
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ACPI_FUNCTION_ENTRY();
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/* Ignore null state */
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if (state) {
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(void)acpi_os_release_object(acpi_gbl_state_cache, state);
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}
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return;
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}
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