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/******************************************************************************

 *

 * Module Name: exsystem - Interface to OS services

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2007, R. Byron Moore

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#include <acpi/acpi.h>

#include <acpi/acinterp.h>

#include <acpi/acevents.h>

#define _COMPONENT          ACPI_EXECUTER

ACPI_MODULE_NAME("exsystem")

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_system_wait_semaphore

 *

 * PARAMETERS:  Semaphore       - Semaphore to wait on

 *              Timeout         - Max time to wait

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Implements a semaphore wait with a check to see if the

 *              semaphore is available immediately.  If it is not, the

 *              interpreter is released before waiting.

 *

 ******************************************************************************/

acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)

{

        acpi_status status;

        ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);

        status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);

        if (ACPI_SUCCESS(status)) {

                return_ACPI_STATUS(status);

        }

        if (status == AE_TIME) {

                /* We must wait, so unlock the interpreter */

                acpi_ex_relinquish_interpreter();

                status = acpi_os_wait_semaphore(semaphore, 1, timeout);

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,

                                  "*** Thread awake after blocking, %s\n",

                                  acpi_format_exception(status)));

                /* Reacquire the interpreter */

                acpi_ex_reacquire_interpreter();

        }

        return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_system_wait_mutex

 *

 * PARAMETERS:  Mutex           - Mutex to wait on

 *              Timeout         - Max time to wait

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Implements a mutex wait with a check to see if the

 *              mutex is available immediately.  If it is not, the

 *              interpreter is released before waiting.

 *

 ******************************************************************************/

acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)

{

        acpi_status status;

        ACPI_FUNCTION_TRACE(ex_system_wait_mutex);

        status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);

        if (ACPI_SUCCESS(status)) {

                return_ACPI_STATUS(status);

        }

        if (status == AE_TIME) {

                /* We must wait, so unlock the interpreter */

                acpi_ex_relinquish_interpreter();

                status = acpi_os_acquire_mutex(mutex, timeout);

                ACPI_DEBUG_PRINT((ACPI_DB_EXEC,

                                  "*** Thread awake after blocking, %s\n",

                                  acpi_format_exception(status)));

                /* Reacquire the interpreter */

                acpi_ex_reacquire_interpreter();

        }

        return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_system_do_stall

 *

 * PARAMETERS:  how_long        - The amount of time to stall,

 *                                in microseconds

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Suspend running thread for specified amount of time.

 *              Note: ACPI specification requires that Stall() does not

 *              relinquish the processor, and delays longer than 100 usec

 *              should use Sleep() instead.  We allow stalls up to 255 usec

 *              for compatibility with other interpreters and existing BIOSs.

 *

 ******************************************************************************/

acpi_status acpi_ex_system_do_stall(u32 how_long)

{

        acpi_status status = AE_OK;

        ACPI_FUNCTION_ENTRY();

        if (how_long > 255) {   /* 255 microseconds */

                /*

                 * Longer than 255 usec, this is an error

                 *

                 * (ACPI specifies 100 usec as max, but this gives some slack in

                 * order to support existing BIOSs)

                 */

                ACPI_ERROR((AE_INFO, "Time parameter is too large (%d)",

                            how_long));

                status = AE_AML_OPERAND_VALUE;

        } else {

                acpi_os_stall(how_long);

        }

        return (status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_system_do_suspend

 *

 * PARAMETERS:  how_long        - The amount of time to suspend,

 *                                in milliseconds

 *

 * RETURN:      None

 *

 * DESCRIPTION: Suspend running thread for specified amount of time.

 *

 ******************************************************************************/

acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)

{

        ACPI_FUNCTION_ENTRY();

        /* Since this thread will sleep, we must release the interpreter */

        acpi_ex_relinquish_interpreter();

        acpi_os_sleep(how_long);

        /* And now we must get the interpreter again */

        acpi_ex_reacquire_interpreter();

        return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_system_signal_event

 *

 * PARAMETERS:  obj_desc        - The object descriptor for this op

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Provides an access point to perform synchronization operations

 *              within the AML.

 *

 ******************************************************************************/

acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)

{

        acpi_status status = AE_OK;

        ACPI_FUNCTION_TRACE(ex_system_signal_event);

        if (obj_desc) {

                status =

                    acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);

        }

        return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_system_wait_event

 *

 * PARAMETERS:  time_desc       - The 'time to delay' object descriptor

 *              obj_desc        - The object descriptor for this op

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Provides an access point to perform synchronization operations

 *              within the AML.  This operation is a request to wait for an

 *              event.

 *

 ******************************************************************************/

acpi_status

acpi_ex_system_wait_event(union acpi_operand_object *time_desc,

                          union acpi_operand_object *obj_desc)

{

        acpi_status status = AE_OK;

        ACPI_FUNCTION_TRACE(ex_system_wait_event);

        if (obj_desc) {

                status =

                    acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,

                                                  (u16) time_desc->integer.

                                                  value);

        }

        return_ACPI_STATUS(status);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_system_reset_event

 *

 * PARAMETERS:  obj_desc        - The object descriptor for this op

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Reset an event to a known state.

 *

 ******************************************************************************/

acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)

{

        acpi_status status = AE_OK;

        acpi_semaphore temp_semaphore;

        ACPI_FUNCTION_ENTRY();

        /*

         * We are going to simply delete the existing semaphore and

         * create a new one!

         */

        status =

            acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);

        if (ACPI_SUCCESS(status)) {

                (void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);

                obj_desc->event.os_semaphore = temp_semaphore;

        }

        return (status);

}