source: rtems/c/src/lib/libbsp/sh/simsh4/timer/timer.c @ b5bc659

4.104.114.84.95
Last change on this file since b5bc659 was b5bc659, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 4, 2003 at 6:52:50 PM

2003-09-04 Joel Sherrill <joel@…>

  • clock/ckinit.c, console/console.c, include/bsp.h, include/coverhd.h, include/ramdisk.h, start/start.S, startup/bspstart.c, startup/hw_init.c, startup/linkcmds, startup/linkcmds-le.coff, timer/timer.c, tools/runtest.in: URL for license changed.
  • 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
23rtems_unsigned32 Timer_interrupts;
24
25rtems_boolean Timer_driver_Find_average_overhead;
26
27/* External assembler interrupt handler routine */
28extern 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 */
40void
41Timer_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 */
72int
73Read_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 */
89rtems_status_code
90Empty_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 */
107void
108Set_find_average_overhead(rtems_boolean find_flag)
109{
110  Timer_driver_Find_average_overhead = find_flag;
111}
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