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- // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
- /*******************************************************************************
- *
- * Module Name: utstate - state object support procedures
- *
- ******************************************************************************/
- #include <acpi/acpi.h>
- #include "accommon.h"
- #define _COMPONENT ACPI_UTILITIES
- ACPI_MODULE_NAME("utstate")
- /*******************************************************************************
- *
- * FUNCTION: acpi_ut_push_generic_state
- *
- * PARAMETERS: list_head - Head of the state stack
- * state - State object to push
- *
- * RETURN: None
- *
- * DESCRIPTION: Push a state object onto a state stack
- *
- ******************************************************************************/
- void
- acpi_ut_push_generic_state(union acpi_generic_state **list_head,
- union acpi_generic_state *state)
- {
- ACPI_FUNCTION_ENTRY();
- /* Push the state object onto the front of the list (stack) */
- state->common.next = *list_head;
- *list_head = state;
- return;
- }
- /*******************************************************************************
- *
- * FUNCTION: acpi_ut_pop_generic_state
- *
- * PARAMETERS: list_head - Head of the state stack
- *
- * RETURN: The popped state object
- *
- * DESCRIPTION: Pop a state object from a state stack
- *
- ******************************************************************************/
- union acpi_generic_state *acpi_ut_pop_generic_state(union acpi_generic_state
- **list_head)
- {
- union acpi_generic_state *state;
- ACPI_FUNCTION_ENTRY();
- /* Remove the state object at the head of the list (stack) */
- state = *list_head;
- if (state) {
- /* Update the list head */
- *list_head = state->common.next;
- }
- return (state);
- }
- /*******************************************************************************
- *
- * FUNCTION: acpi_ut_create_generic_state
- *
- * PARAMETERS: None
- *
- * RETURN: The new state object. NULL on failure.
- *
- * DESCRIPTION: Create a generic state object. Attempt to obtain one from
- * the global state cache; If none available, create a new one.
- *
- ******************************************************************************/
- union acpi_generic_state *acpi_ut_create_generic_state(void)
- {
- union acpi_generic_state *state;
- ACPI_FUNCTION_ENTRY();
- state = acpi_os_acquire_object(acpi_gbl_state_cache);
- if (state) {
- /* Initialize */
- state->common.descriptor_type = ACPI_DESC_TYPE_STATE;
- }
- return (state);
- }
- /*******************************************************************************
- *
- * FUNCTION: acpi_ut_create_thread_state
- *
- * PARAMETERS: None
- *
- * RETURN: New Thread State. NULL on failure
- *
- * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
- * to track per-thread info during method execution
- *
- ******************************************************************************/
- struct acpi_thread_state *acpi_ut_create_thread_state(void)
- {
- union acpi_generic_state *state;
- ACPI_FUNCTION_ENTRY();
- /* Create the generic state object */
- state = acpi_ut_create_generic_state();
- if (!state) {
- return (NULL);
- }
- /* Init fields specific to the update struct */
- state->common.descriptor_type = ACPI_DESC_TYPE_STATE_THREAD;
- state->thread.thread_id = acpi_os_get_thread_id();
- /* Check for invalid thread ID - zero is very bad, it will break things */
- if (!state->thread.thread_id) {
- ACPI_ERROR((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
- state->thread.thread_id = (acpi_thread_id) 1;
- }
- return ((struct acpi_thread_state *)state);
- }
- /*******************************************************************************
- *
- * FUNCTION: acpi_ut_create_update_state
- *
- * PARAMETERS: object - Initial Object to be installed in the state
- * action - Update action to be performed
- *
- * RETURN: New state object, null on failure
- *
- * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
- * to update reference counts and delete complex objects such
- * as packages.
- *
- ******************************************************************************/
- union acpi_generic_state *acpi_ut_create_update_state(union acpi_operand_object
- *object, u16 action)
- {
- union acpi_generic_state *state;
- ACPI_FUNCTION_ENTRY();
- /* Create the generic state object */
- state = acpi_ut_create_generic_state();
- if (!state) {
- return (NULL);
- }
- /* Init fields specific to the update struct */
- state->common.descriptor_type = ACPI_DESC_TYPE_STATE_UPDATE;
- state->update.object = object;
- state->update.value = action;
- return (state);
- }
- /*******************************************************************************
- *
- * FUNCTION: acpi_ut_create_pkg_state
- *
- * PARAMETERS: object - Initial Object to be installed in the state
- * action - Update action to be performed
- *
- * RETURN: New state object, null on failure
- *
- * DESCRIPTION: Create a "Package State"
- *
- ******************************************************************************/
- union acpi_generic_state *acpi_ut_create_pkg_state(void *internal_object,
- void *external_object,
- u32 index)
- {
- union acpi_generic_state *state;
- ACPI_FUNCTION_ENTRY();
- /* Create the generic state object */
- state = acpi_ut_create_generic_state();
- if (!state) {
- return (NULL);
- }
- /* Init fields specific to the update struct */
- state->common.descriptor_type = ACPI_DESC_TYPE_STATE_PACKAGE;
- state->pkg.source_object = (union acpi_operand_object *)internal_object;
- state->pkg.dest_object = external_object;
- state->pkg.index = index;
- state->pkg.num_packages = 1;
- return (state);
- }
- /*******************************************************************************
- *
- * FUNCTION: acpi_ut_create_control_state
- *
- * PARAMETERS: None
- *
- * RETURN: New state object, null on failure
- *
- * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
- * to support nested IF/WHILE constructs in the AML.
- *
- ******************************************************************************/
- union acpi_generic_state *acpi_ut_create_control_state(void)
- {
- union acpi_generic_state *state;
- ACPI_FUNCTION_ENTRY();
- /* Create the generic state object */
- state = acpi_ut_create_generic_state();
- if (!state) {
- return (NULL);
- }
- /* Init fields specific to the control struct */
- state->common.descriptor_type = ACPI_DESC_TYPE_STATE_CONTROL;
- state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING;
- return (state);
- }
- /*******************************************************************************
- *
- * FUNCTION: acpi_ut_delete_generic_state
- *
- * PARAMETERS: state - The state object to be deleted
- *
- * RETURN: None
- *
- * DESCRIPTION: Release a state object to the state cache. NULL state objects
- * are ignored.
- *
- ******************************************************************************/
- void acpi_ut_delete_generic_state(union acpi_generic_state *state)
- {
- ACPI_FUNCTION_ENTRY();
- /* Ignore null state */
- if (state) {
- (void)acpi_os_release_object(acpi_gbl_state_cache, state);
- }
- return;
- }
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