utmisc.c

h内核

	ACPI_FUNCTION_ENTRY ();


	/* Walk entire string, uppercasing the letters */

	for (string = src_string; *string; ) {
		*string = (char) ACPI_TOUPPER (*string);
		string++;
	}

	return (src_string);
}
#endif  /*  ACPI_FUTURE_USAGE  */


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_mutex_initialize
 *
 * PARAMETERS:  None.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create the system mutex objects.
 *
 ******************************************************************************/

acpi_status
acpi_ut_mutex_initialize (
	void)
{
	u32                             i;
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("ut_mutex_initialize");


	/*
	 * Create each of the predefined mutex objects
	 */
	for (i = 0; i < NUM_MUTEX; i++) {
		status = acpi_ut_create_mutex (i);
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	status = acpi_os_create_lock (&acpi_gbl_gpe_lock);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_mutex_terminate
 *
 * PARAMETERS:  None.
 *
 * RETURN:      None.
 *
 * DESCRIPTION: Delete all of the system mutex objects.
 *
 ******************************************************************************/

void
acpi_ut_mutex_terminate (
	void)
{
	u32                             i;


	ACPI_FUNCTION_TRACE ("ut_mutex_terminate");


	/*
	 * Delete each predefined mutex object
	 */
	for (i = 0; i < NUM_MUTEX; i++) {
		(void) acpi_ut_delete_mutex (i);
	}

	acpi_os_delete_lock (acpi_gbl_gpe_lock);
	return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_mutex
 *
 * PARAMETERS:  mutex_iD        - ID of the mutex to be created
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a mutex object.
 *
 ******************************************************************************/

acpi_status
acpi_ut_create_mutex (
	acpi_mutex_handle               mutex_id)
{
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE_U32 ("ut_create_mutex", mutex_id);


	if (mutex_id > MAX_MUTEX) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	if (!acpi_gbl_mutex_info[mutex_id].mutex) {
		status = acpi_os_create_semaphore (1, 1,
				  &acpi_gbl_mutex_info[mutex_id].mutex);
		acpi_gbl_mutex_info[mutex_id].owner_id = ACPI_MUTEX_NOT_ACQUIRED;
		acpi_gbl_mutex_info[mutex_id].use_count = 0;
	}

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_mutex
 *
 * PARAMETERS:  mutex_iD        - ID of the mutex to be deleted
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete a mutex object.
 *
 ******************************************************************************/

acpi_status
acpi_ut_delete_mutex (
	acpi_mutex_handle               mutex_id)
{
	acpi_status                     status;


	ACPI_FUNCTION_TRACE_U32 ("ut_delete_mutex", mutex_id);


	if (mutex_id > MAX_MUTEX) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	status = acpi_os_delete_semaphore (acpi_gbl_mutex_info[mutex_id].mutex);

	acpi_gbl_mutex_info[mutex_id].mutex = NULL;
	acpi_gbl_mutex_info[mutex_id].owner_id = ACPI_MUTEX_NOT_ACQUIRED;

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_acquire_mutex
 *
 * PARAMETERS:  mutex_iD        - ID of the mutex to be acquired
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Acquire a mutex object.
 *
 ******************************************************************************/

acpi_status
acpi_ut_acquire_mutex (
	acpi_mutex_handle               mutex_id)
{
	acpi_status                     status;
	u32                             this_thread_id;


	ACPI_FUNCTION_NAME ("ut_acquire_mutex");


	if (mutex_id > MAX_MUTEX) {
		return (AE_BAD_PARAMETER);
	}

	this_thread_id = acpi_os_get_thread_id ();

#ifdef ACPI_MUTEX_DEBUG
	{
		u32                             i;
		/*
		 * Mutex debug code, for internal debugging only.
		 *
		 * Deadlock prevention.  Check if this thread owns any mutexes of value
		 * greater than or equal to this one.  If so, the thread has violated
		 * the mutex ordering rule.  This indicates a coding error somewhere in
		 * the ACPI subsystem code.
		 */
		for (i = mutex_id; i < MAX_MUTEX; i++) {
			if (acpi_gbl_mutex_info[i].owner_id == this_thread_id) {
				if (i == mutex_id) {
					ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
							"Mutex [%s] already acquired by this thread [%X]\n",
							acpi_ut_get_mutex_name (mutex_id), this_thread_id));

					return (AE_ALREADY_ACQUIRED);
				}

				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
						"Invalid acquire order: Thread %X owns [%s], wants [%s]\n",
						this_thread_id, acpi_ut_get_mutex_name (i),
						acpi_ut_get_mutex_name (mutex_id)));

				return (AE_ACQUIRE_DEADLOCK);
			}
		}
	}
#endif

	ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
			 "Thread %X attempting to acquire Mutex [%s]\n",
			 this_thread_id, acpi_ut_get_mutex_name (mutex_id)));

	status = acpi_os_wait_semaphore (acpi_gbl_mutex_info[mutex_id].mutex,
			   1, ACPI_WAIT_FOREVER);
	if (ACPI_SUCCESS (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %X acquired Mutex [%s]\n",
				 this_thread_id, acpi_ut_get_mutex_name (mutex_id)));

		acpi_gbl_mutex_info[mutex_id].use_count++;
		acpi_gbl_mutex_info[mutex_id].owner_id = this_thread_id;
	}
	else {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Thread %X could not acquire Mutex [%s] %s\n",
				 this_thread_id, acpi_ut_get_mutex_name (mutex_id),
				 acpi_format_exception (status)));
	}

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_release_mutex
 *
 * PARAMETERS:  mutex_iD        - ID of the mutex to be released
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Release a mutex object.
 *
 ******************************************************************************/

acpi_status
acpi_ut_release_mutex (
	acpi_mutex_handle               mutex_id)
{
	acpi_status                     status;
	u32                             i;
	u32                             this_thread_id;


	ACPI_FUNCTION_NAME ("ut_release_mutex");


	this_thread_id = acpi_os_get_thread_id ();
	ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX,
		"Thread %X releasing Mutex [%s]\n", this_thread_id,
		acpi_ut_get_mutex_name (mutex_id)));

	if (mutex_id > MAX_MUTEX) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * Mutex must be acquired in order to release it!
	 */
	if (acpi_gbl_mutex_info[mutex_id].owner_id == ACPI_MUTEX_NOT_ACQUIRED) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"Mutex [%s] is not acquired, cannot release\n",
				acpi_ut_get_mutex_name (mutex_id)));

		return (AE_NOT_ACQUIRED);
	}

	/*
	 * Deadlock prevention.  Check if this thread owns any mutexes of value
	 * greater than this one.  If so, the thread has violated the mutex
	 * ordering rule.  This indicates a coding error somewhere in
	 * the ACPI subsystem code.
	 */
	for (i = mutex_id; i < MAX_MUTEX; i++) {
		if (acpi_gbl_mutex_info[i].owner_id == this_thread_id) {
			if (i == mutex_id) {
				continue;
			}

			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
					"Invalid release order: owns [%s], releasing [%s]\n",
					acpi_ut_get_mutex_name (i), acpi_ut_get_mutex_name (mutex_id)));

			return (AE_RELEASE_DEADLOCK);
		}
	}

	/* Mark unlocked FIRST */

	acpi_gbl_mutex_info[mutex_id].owner_id = ACPI_MUTEX_NOT_ACQUIRED;

	status = acpi_os_signal_semaphore (acpi_gbl_mutex_info[mutex_id].mutex, 1);

	if (ACPI_FAILURE (status)) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Thread %X could not release Mutex [%s] %s\n",
				 this_thread_id, acpi_ut_get_mutex_name (mutex_id),
				 acpi_format_exception (status)));
	}
	else {
		ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %X released Mutex [%s]\n",
				 this_thread_id, acpi_ut_get_mutex_name (mutex_id)));
	}

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_update_state_and_push
 *
 * PARAMETERS:  *Object         - Object to be added to the new state
 *              Action          - Increment/Decrement
 *              state_list      - List the state will be added to
 *
 * RETURN:      None
 *
 * DESCRIPTION: Create a new state and push it
 *
 ******************************************************************************/

acpi_status
acpi_ut_create_update_state_and_push (
	union acpi_operand_object       *object,
	u16                             action,
	union acpi_generic_state        **state_list)
{
	union acpi_generic_state         *state;


	ACPI_FUNCTION_ENTRY ();


	/* Ignore null objects; these are expected */

	if (!object) {
		return (AE_OK);
	}

	state = acpi_ut_create_update_state (object, action);
	if (!state) {
		return (AE_NO_MEMORY);
	}

	acpi_ut_push_generic_state (state_list, state);
	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_pkg_state_and_push
 *
 * PARAMETERS:  *Object         - Object to be added to the new state
 *              Action          - Increment/Decrement
 *              state_list      - List the state will be added to
 *
 * RETURN:      None
 *
 * DESCRIPTION: Create a new state and push it
 *
 ******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_ut_create_pkg_state_and_push (
	void                            *internal_object,
	void                            *external_object,
	u16                             index,
	union acpi_generic_state        **state_list)
{
	union acpi_generic_state         *state;


	ACPI_FUNCTION_ENTRY ();


	state = acpi_ut_create_pkg_state (internal_object, external_object, index);
	if (!state) {
		return (AE_NO_MEMORY);
	}

	acpi_ut_push_generic_state (state_list, state);
	return (AE_OK);
}
#endif  /*  ACPI_FUTURE_USAGE  */

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_push_generic_state
 *
 * PARAMETERS:  list_head           - Head of the state stack
 *              State               - State object to push
 *
 * RETURN:      Status
 *
 * 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_TRACE ("ut_push_generic_state");


	/* Push the state object onto the front of the list (stack) */

	state->common.next = *list_head;
	*list_head = state;

	return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_pop_generic_state
 *
 * PARAMETERS:  list_head           - Head of the state stack
 *
 * RETURN:      Status
 *
 * 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_TRACE ("ut_pop_generic_state");


	/* 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_PTR (state);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_generic_state
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * 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_ut_acquire_from_cache (ACPI_MEM_LIST_STATE);

	/* Initialize */

	if (state) {
		state->common.data_type = ACPI_DESC_TYPE_STATE;
	}

	return (state);