/*
* COPYRIGHT (c) 1989-2009.
* 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.com/license/LICENSE.
*
* $Id$
*/
/*
* WARNING!!!!!!!!!
*
* THIS TEST USES INTERNAL RTEMS VARIABLES!!!
*/
#define CONFIGURE_INIT
#include "system.h"
#include <bsp.h>
#define _RTEMS_TMTEST27
#include <tm27.h>
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
);
rtems_task Init(
rtems_task_argument argument
)
{
rtems_status_code status;
Print_Warning();
puts( "\n\n*** TIME TEST 27 ***" );
#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
)
{
Install_tm27_vector( Isr_handler );
/*
* No preempt .. no nesting
*/
Interrupt_nest = 0;
_Thread_Dispatch_disable_level = 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(
"interrupt entry overhead: returns to interrupted task",
Interrupt_enter_time,
1,
0,
timer_overhead
);
put_time(
"interrupt exit overhead: returns to interrupted task",
Interrupt_return_time,
1,
0,
timer_overhead
);
/*
* No preempt .. nested
*/
_Thread_Dispatch_disable_level = 1;
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_disable_level = 0;
put_time(
"interrupt entry overhead: returns to nested interrupt",
Interrupt_enter_nested_time,
1,
0,
0
);
put_time(
"interrupt exit overhead: returns to nested interrupt",
Interrupt_return_nested_time,
1,
0,
0
);
/*
* Does a preempt .. not nested
*/
_Thread_Dispatch_disable_level = 0;
_Thread_Heir = (rtems_tcb *) _Thread_Ready_chain[LOW_PRIORITY].last;
_Context_Switch_necessary = 1;
Interrupt_occurred = 0;
benchmark_timer_initialize();
Cause_tm27_intr();
/*
* goes to Isr_handler and then returns
*/
puts( "*** END OF TEST 27 ***" );
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
)
{
#if (MUST_WAIT_FOR_INTERRUPT == 1)
while ( Interrupt_occurred == 0 );
#endif
end_time = benchmark_timer_read();
put_time(
"interrupt entry overhead: returns to preempting task",
Interrupt_enter_time,
1,
0,
timer_overhead
);
put_time(
"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_Dispatch_disable_level = 0;
_Thread_Heir = (rtems_tcb *) _Thread_Ready_chain[LOW_PRIORITY].first;
_Context_Switch_necessary = 1;
_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();
}