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/*
 *  Timer Init
 *
 *  This module implements benchmark stub for simulator.
 *
 *  Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia
 *  Author: Victor V. Vengerov <vvv@oktet.ru>
 *
 *  COPYRIGHT (c) 1989-1998-2001.
 *  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.OARcorp.com/rtems/license.html.
 *
 *  timer.c,v 1.1 2001/10/11 21:04:35 joel Exp
 */
 
#include <rtems.h>
#include <bsp.h>
 
rtems_unsigned32 Timer_interrupts;
 
rtems_boolean Timer_driver_Find_average_overhead;
 
/* External assembler interrupt handler routine */
extern rtems_isr timerisr(rtems_vector_number vector);
 
 
/* Timer_initialize --
 *     Initialize timer 2 for accurate time measurement.
 *
 * PARAMETERS:
 *     none
 *
 * RETURNS:
 *     none
 */
void
Timer_initialize(void)
{
    return;
}
 
/*
 *  The following controls the behavior of Read_timer().
 *
 *  FIND_AVG_OVERHEAD *  instructs the routine to return the "raw" count.
 *
 *  AVG_OVEREHAD is the overhead for starting and stopping the timer.  It
 *  is usually deducted from the number returned.
 *
 *  LEAST_VALID is the lowest number this routine should trust.  Numbers
 *  below this are "noise" and zero is returned.
 */
 
#define AVG_OVERHEAD      0  /* It typically takes 2.0 microseconds */
                             /* (Y countdowns) to start/stop the timer. */
                             /* This value is in microseconds. */
#define LEAST_VALID       1  /* Don't trust a clicks value lower than this */
 
/* Read_timer --
 *     Read timer value in microsecond units since timer start.
 *
 * PARAMETERS:
 *     none
 *
 * RETURNS:
 *     number of microseconds since timer has been started
 */
int
Read_timer( void )
{
    return 0;
}
 
 
/* Empty_function --
 *     Empty function call used in loops to measure basic cost of looping
 *     in Timing Test Suite.
 *
 * PARAMETERS:
 *     none
 *
 * RETURNS:
 *     RTEMS_SUCCESSFUL
 */
rtems_status_code
Empty_function(void)
{
    return RTEMS_SUCCESSFUL;
}
 
/* Set_find_average_overhead --
 *     This routine is invoked by the "Check Timer" (tmck) test in the
 *     RTEMS Timing Test Suite. It makes the Read_timer routine not
 *     subtract the overhead required to initialize and read the benchmark
 *     timer.
 *
 * PARAMETERS:
 *     find_flag - boolean flag, TRUE if overhead must not be subtracted.
 *
 * RETURNS:
 *     none
 */
void
Set_find_average_overhead(rtems_boolean find_flag)
{
  Timer_driver_Find_average_overhead = find_flag;
}

Line No.	Rev	Author	Line
1	1026	ivang	`/*`
2			`* Timer Init`
3			`*`
4			`* This module implements benchmark stub for simulator.`
5			`*`
6			`* Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia`
7			`* Author: Victor V. Vengerov <vvv@oktet.ru>`
8			`*`
9			`* COPYRIGHT (c) 1989-1998-2001.`
10			`* On-Line Applications Research Corporation (OAR).`
11			`*`
12			`* The license and distribution terms for this file may be`
13			`* found in the file LICENSE in this distribution or at`
14			`*`
15			`* http://www.OARcorp.com/rtems/license.html.`
16			`*`
17			`* timer.c,v 1.1 2001/10/11 21:04:35 joel Exp`
18			`*/`
19
20			`#include <rtems.h>`
21			`#include <bsp.h>`
22
23			`rtems_unsigned32 Timer_interrupts;`
24
25			`rtems_boolean Timer_driver_Find_average_overhead;`
26
27			`/* External assembler interrupt handler routine */`
28			`extern rtems_isr timerisr(rtems_vector_number vector);`
29
30
31			`/* Timer_initialize --`
32			`* Initialize timer 2 for accurate time measurement.`
33			`*`
34			`* PARAMETERS:`
35			`* none`
36			`*`
37			`* RETURNS:`
38			`* none`
39			`*/`
40			`void`
41			`Timer_initialize(void)`
42			`{`
43			`return;`
44			`}`
45
46			`/*`
47			`* The following controls the behavior of Read_timer().`
48			`*`
49			`* FIND_AVG_OVERHEAD * instructs the routine to return the "raw" count.`
50			`*`
51			`* AVG_OVEREHAD is the overhead for starting and stopping the timer. It`
52			`* is usually deducted from the number returned.`
53			`*`
54			`* LEAST_VALID is the lowest number this routine should trust. Numbers`
55			`* below this are "noise" and zero is returned.`
56			`*/`
57
58			`#define AVG_OVERHEAD 0 /* It typically takes 2.0 microseconds */`
59			`/* (Y countdowns) to start/stop the timer. */`
60			`/* This value is in microseconds. */`
61			`#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */`
62
63			`/* Read_timer --`
64			`* Read timer value in microsecond units since timer start.`
65			`*`
66			`* PARAMETERS:`
67			`* none`
68			`*`
69			`* RETURNS:`
70			`* number of microseconds since timer has been started`
71			`*/`
72			`int`
73			`Read_timer( void )`
74			`{`
75			`return 0;`
76			`}`
77
78
79			`/* Empty_function --`
80			`* Empty function call used in loops to measure basic cost of looping`
81			`* in Timing Test Suite.`
82			`*`
83			`* PARAMETERS:`
84			`* none`
85			`*`
86			`* RETURNS:`
87			`* RTEMS_SUCCESSFUL`
88			`*/`
89			`rtems_status_code`
90			`Empty_function(void)`
91			`{`
92			`return RTEMS_SUCCESSFUL;`
93			`}`
94
95			`/* Set_find_average_overhead --`
96			`* This routine is invoked by the "Check Timer" (tmck) test in the`
97			`* RTEMS Timing Test Suite. It makes the Read_timer routine not`
98			`* subtract the overhead required to initialize and read the benchmark`
99			`* timer.`
100			`*`
101			`* PARAMETERS:`
102			`* find_flag - boolean flag, TRUE if overhead must not be subtracted.`
103			`*`
104			`* RETURNS:`
105			`* none`
106			`*/`
107			`void`
108			`Set_find_average_overhead(rtems_boolean find_flag)`
109			`{`
110			`Timer_driver_Find_average_overhead = find_flag;`
111			`}`

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[/] [or1k/] [trunk/] [rtems-20020807/] [c/] [src/] [lib/] [libbsp/] [sh/] [simsh4/] [timer/] [timer.c] - Blame information for rev 1765