/*
* COPYRIGHT (c) 1989-2013.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/*
* WARNING!!!!!!!!!
*
* THIS TEST USES INTERNAL RTEMS VARIABLES!!!
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define TEST_INIT
#define CONFIGURE_INIT
#include "system.h"
#include <bsp.h>
#include <rtems/score/schedulerpriorityimpl.h>
#define _RTEMS_TMTEST27
#include <tm27.h>
const char rtems_test_name[] = "TIME TEST 27";
rtems_task Task_1(
rtems_task_argument argument
);
rtems_task Task_2(
rtems_task_argument argument
);
volatile uint32_t Interrupt_occurred;
volatile uint32_t Interrupt_enter_time, Interrupt_enter_nested_time;
volatile uint32_t Interrupt_return_time, Interrupt_return_nested_time;
uint32_t Interrupt_nest;
uint32_t timer_overhead;
rtems_isr Isr_handler(
rtems_vector_number vector
);
static void set_thread_executing( Thread_Control *thread )
{
_Per_CPU_Get_snapshot()->executing = thread;
}
rtems_task Init(
rtems_task_argument argument
)
{
rtems_status_code status;
Print_Warning();
TEST_BEGIN();
if (
_Scheduler_Table[ 0 ].Operations.initialize
!= _Scheduler_priority_Initialize
) {
puts(" Error ==> " );
puts("Test only supported for deterministic priority scheduler\n" );
TEST_END();
rtems_test_exit( 0 );
}
#define LOW_PRIORITY (RTEMS_MAXIMUM_PRIORITY - 1u)
status = rtems_task_create(
rtems_build_name( 'T', 'A', '1', ' ' ),
LOW_PRIORITY,
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&Task_id[ 1 ]
);
directive_failed( status, "rtems_task_create Task_1" );
status = rtems_task_start( Task_id[ 1 ], Task_1, 0 );
directive_failed( status, "rtems_task_start Task_1" );
status = rtems_task_create(
rtems_build_name( 'T', 'A', '2', ' ' ),
LOW_PRIORITY,
RTEMS_MINIMUM_STACK_SIZE,
RTEMS_DEFAULT_MODES,
RTEMS_DEFAULT_ATTRIBUTES,
&Task_id[ 2 ]
);
directive_failed( status, "rtems_task_create of Task_2" );
status = rtems_task_start( Task_id[ 2 ], Task_2, 0 );
directive_failed( status, "rtems_task_start of Task_2" );
benchmark_timer_initialize();
benchmark_timer_read();
benchmark_timer_initialize();
timer_overhead = benchmark_timer_read();
status = rtems_task_delete( RTEMS_SELF );
directive_failed( status, "rtems_task_delete of RTEMS_SELF" );
}
rtems_task Task_1(
rtems_task_argument argument
)
{
Scheduler_priority_Context *scheduler_context =
_Scheduler_priority_Get_context( _Thread_Scheduler_get_home( _Thread_Get_executing() ) );
#if defined(RTEMS_SMP)
rtems_interrupt_level level;
#endif
Install_tm27_vector( Isr_handler );
/*
* No preempt .. no nesting
*/
Interrupt_nest = 0;
Interrupt_occurred = 0;
benchmark_timer_initialize();
Cause_tm27_intr();
/* goes to Isr_handler */
#if (MUST_WAIT_FOR_INTERRUPT == 1)
while ( Interrupt_occurred == 0 );
#endif
Interrupt_return_time = benchmark_timer_read();
put_time(
"rtems interrupt: entry overhead returns to interrupted task",
Interrupt_enter_time,
1,
0,
timer_overhead
);
put_time(
"rtems interrupt: exit overhead returns to interrupted task",
Interrupt_return_time,
1,
0,
timer_overhead
);
/*
* No preempt .. nested
*/
_Thread_Dispatch_disable();
Interrupt_nest = 1;
Interrupt_occurred = 0;
benchmark_timer_initialize();
Cause_tm27_intr();
/* goes to Isr_handler */
#if (MUST_WAIT_FOR_INTERRUPT == 1)
while ( Interrupt_occurred == 0 );
#endif
Interrupt_return_time = benchmark_timer_read();
_Thread_Dispatch_enable( _Per_CPU_Get() );
put_time(
"rtems interrupt: entry overhead returns to nested interrupt",
Interrupt_enter_nested_time,
1,
0,
0
);
put_time(
"rtems interrupt: exit overhead returns to nested interrupt",
Interrupt_return_nested_time,
1,
0,
0
);
/*
* Does a preempt .. not nested
*/
#if defined(RTEMS_SMP)
_ISR_Local_disable(level);
#endif
set_thread_executing(
(Thread_Control *) _Chain_First(&scheduler_context->Ready[LOW_PRIORITY])
);
_Thread_Dispatch_necessary = 1;
#if defined(RTEMS_SMP)
_ISR_Local_enable(level);
#endif
Interrupt_occurred = 0;
benchmark_timer_initialize();
Cause_tm27_intr();
/*
* goes to Isr_handler and then returns
*/
TEST_END();
rtems_test_exit( 0 );
}
/*
* NOTE: When this task is executing, some of the assumptions made
* regarding the placement of the currently executing task's TCB
* on the ready chains have been violated. At least the assumption
* that this task is at the head of the chain for its priority
* has been violated.
*/
rtems_task Task_2(
rtems_task_argument argument
)
{
Thread_Control *executing = _Thread_Get_executing();
const Scheduler_Control *scheduler;
Scheduler_priority_Context *scheduler_context;
ISR_lock_Context state_lock_context;
ISR_lock_Context scheduler_lock_context;
_Thread_State_acquire( executing, &state_lock_context );
scheduler = _Thread_Scheduler_get_home( executing );
scheduler_context = _Scheduler_priority_Get_context( scheduler );
_Thread_State_release( executing, &state_lock_context );
#if (MUST_WAIT_FOR_INTERRUPT == 1)
while ( Interrupt_occurred == 0 );
#endif
end_time = benchmark_timer_read();
put_time(
"rtems interrupt: entry overhead returns to preempting task",
Interrupt_enter_time,
1,
0,
timer_overhead
);
put_time(
"rtems interrupt: exit overhead returns to preempting task",
end_time,
1,
0,
0
);
fflush( stdout );
/*
* Switch back to the other task to exit the test.
*/
_Thread_State_acquire( executing, &state_lock_context );
_Scheduler_Acquire_critical( scheduler, &scheduler_lock_context );
set_thread_executing(
(Thread_Control *) _Chain_First(&scheduler_context->Ready[LOW_PRIORITY])
);
_Thread_Dispatch_necessary = 1;
_Scheduler_Release_critical( scheduler, &scheduler_lock_context );
_Thread_State_release( executing, &state_lock_context );
_Thread_Dispatch();
}
/* The Isr_handler() and Isr_handler_inner() routines are structured
* so that there will be as little entry overhead as possible included
* in the interrupt entry time.
*/
void Isr_handler_inner( void );
rtems_isr Isr_handler(
rtems_vector_number vector
)
{
end_time = benchmark_timer_read();
Interrupt_occurred = 1;
Isr_handler_inner();
}
void Isr_handler_inner( void )
{
/*enable_tracing();*/
Clear_tm27_intr();
switch ( Interrupt_nest ) {
case 0:
Interrupt_enter_time = end_time;
break;
case 1:
Interrupt_enter_time = end_time;
Interrupt_nest = 2;
Interrupt_occurred = 0;
Lower_tm27_intr();
benchmark_timer_initialize();
Cause_tm27_intr();
/* goes to a nested copy of Isr_handler */
#if (MUST_WAIT_FOR_INTERRUPT == 1)
while ( Interrupt_occurred == 0 );
#endif
Interrupt_return_nested_time = benchmark_timer_read();
break;
case 2:
Interrupt_enter_nested_time = end_time;
break;
}
benchmark_timer_initialize();
}
