source: rtems/c/src/lib/libbsp/sh/simsh4/timer/timer.c @ 97cfbdc1

4.104.114.9
Last change on this file since 97cfbdc1 was 97cfbdc1, checked in by Ralf Corsepius <ralf.corsepius@…>, on Aug 27, 2008 at 2:17:28 PM

Eliminate rtems_boolean.

  • Property mode set to 100644
File size: 2.5 KB
Line 
1/*
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.rtems.com/license/LICENSE.
16 *
17 *  $Id$
18 */
19
20#include <rtems.h>
21#include <bsp.h>
22
23uint32_t         Timer_interrupts;
24
25bool Timer_driver_Find_average_overhead;
26
27/* External assembler interrupt handler routine */
28extern rtems_isr timerisr(rtems_vector_number vector);
29
30/* Timer_initialize --
31 *     Initialize timer 2 for accurate time measurement.
32 *
33 * PARAMETERS:
34 *     none
35 *
36 * RETURNS:
37 *     none
38 */
39void
40Timer_initialize(void)
41{
42    return;
43}
44
45/*
46 *  The following controls the behavior of Read_timer().
47 *
48 *  FIND_AVG_OVERHEAD *  instructs the routine to return the "raw" count.
49 *
50 *  AVG_OVEREHAD is the overhead for starting and stopping the timer.  It
51 *  is usually deducted from the number returned.
52 *
53 *  LEAST_VALID is the lowest number this routine should trust.  Numbers
54 *  below this are "noise" and zero is returned.
55 */
56
57#define AVG_OVERHEAD      0  /* It typically takes 2.0 microseconds */
58                             /* (Y countdowns) to start/stop the timer. */
59                             /* This value is in microseconds. */
60#define LEAST_VALID       1  /* Don't trust a clicks value lower than this */
61
62/* Read_timer --
63 *     Read timer value in microsecond units since timer start.
64 *
65 * PARAMETERS:
66 *     none
67 *
68 * RETURNS:
69 *     number of microseconds since timer has been started
70 */
71int
72Read_timer( void )
73{
74    return 0;
75}
76
77/* Empty_function --
78 *     Empty function call used in loops to measure basic cost of looping
79 *     in Timing Test Suite.
80 *
81 * PARAMETERS:
82 *     none
83 *
84 * RETURNS:
85 *     RTEMS_SUCCESSFUL
86 */
87rtems_status_code
88Empty_function(void)
89{
90    return RTEMS_SUCCESSFUL;
91}
92
93/* Set_find_average_overhead --
94 *     This routine is invoked by the "Check Timer" (tmck) test in the
95 *     RTEMS Timing Test Suite. It makes the Read_timer routine not
96 *     subtract the overhead required to initialize and read the benchmark
97 *     timer.
98 *
99 * PARAMETERS:
100 *     find_flag - boolean flag, TRUE if overhead must not be subtracted.
101 *
102 * RETURNS:
103 *     none
104 */
105void
106Set_find_average_overhead(bool find_flag)
107{
108  Timer_driver_Find_average_overhead = find_flag;
109}
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