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Diffstat (limited to 'testsuites/validation/tx-timecounter.c')
-rw-r--r-- | testsuites/validation/tx-timecounter.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/testsuites/validation/tx-timecounter.c b/testsuites/validation/tx-timecounter.c new file mode 100644 index 0000000000..01b55f2578 --- /dev/null +++ b/testsuites/validation/tx-timecounter.c @@ -0,0 +1,160 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @ingroup RTEMSTestSuitesValidation + * + * @brief This source file contains the definition of SetGetTimecountHandler(), + * GetTimecountCounter(), and SetTimecountCounter(). + */ + +/* + * Copyright (C) 2021 embedded brains GmbH & Co. KG + * + * 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. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 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 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "tx-support.h" + +#include <rtems/sysinit.h> +#include <rtems/timecounter.h> +#include <rtems/score/atomic.h> +#include <rtems/score/percpu.h> +#include <rtems/score/smpimpl.h> +#include <rtems/score/threaddispatch.h> + +typedef struct { + struct timecounter base; + GetTimecountHandler handler; + Atomic_Ulong counter; +} TimecounterControl; + +static TimecounterControl TimecounterInstance; + +GetTimecountHandler SetGetTimecountHandler( GetTimecountHandler handler ) +{ + GetTimecountHandler previous; + + previous = TimecounterInstance.handler; + TimecounterInstance.handler = handler; + return previous; +} + +uint32_t GetTimecountCounter( void ) +{ + return (uint32_t) _Atomic_Load_ulong( + &TimecounterInstance.counter, + ATOMIC_ORDER_RELAXED + ); +} + +uint32_t SetTimecountCounter( uint32_t counter ) +{ + return (uint32_t) _Atomic_Exchange_ulong( + &TimecounterInstance.counter, + counter, + ATOMIC_ORDER_RELAXED + ); +} + +static uint32_t GetTimecountSoftware( void ) +{ + return (uint32_t) _Atomic_Fetch_add_ulong( + &TimecounterInstance.counter, + 1, + ATOMIC_ORDER_RELAXED + ); +} + +static uint32_t GetTimecountWrapper( struct timecounter *tc ) +{ + TimecounterControl *self; + + self = (TimecounterControl *) tc; + return ( *self->handler )(); +} + +static void InstallTimecounter( void ) +{ + TimecounterControl *self; + + self = &TimecounterInstance; + self->handler = GetTimecountSoftware; + self->base.tc_get_timecount = GetTimecountWrapper; + self->base.tc_counter_mask = 0xffffffff; + self->base.tc_frequency = SOFTWARE_TIMECOUNTER_FREQUENCY; + self->base.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER + 1; + rtems_timecounter_install( &self->base ); +} + +RTEMS_SYSINIT_ITEM( + InstallTimecounter, + RTEMS_SYSINIT_DEVICE_DRIVERS, + RTEMS_SYSINIT_ORDER_LAST +); + +static void DoTimecounterTick( void *arg ) +{ + (void) arg; + _Timecounter_Tick(); +} + +void TimecounterTick( void ) +{ + unsigned long counter_ticks_per_clock_tick; + Per_CPU_Control *cpu_self; + bool success; + + counter_ticks_per_clock_tick = + SOFTWARE_TIMECOUNTER_FREQUENCY / rtems_clock_get_ticks_per_second(); + cpu_self = _Thread_Dispatch_disable(); + + do { + unsigned long old_counter; + unsigned long new_counter; + + old_counter = _Atomic_Load_ulong( + &TimecounterInstance.counter, + ATOMIC_ORDER_RELAXED + ); + new_counter = old_counter + counter_ticks_per_clock_tick - + ( old_counter % counter_ticks_per_clock_tick ); + success = _Atomic_Compare_exchange_ulong( + &TimecounterInstance.counter, + &old_counter, + new_counter, + ATOMIC_ORDER_RELAXED, + ATOMIC_ORDER_RELAXED + ); + } while ( !success ); + + DoTimecounterTick( NULL ); +#if defined( RTEMS_SMP ) + _SMP_Othercast_action( DoTimecounterTick, NULL ); +#endif + _Thread_Dispatch_enable( cpu_self ); +} |