source: rtems/cpukit/rtems/src/rtclock.c @ 3a4ae6c

4.104.114.84.95
Last change on this file since 3a4ae6c was 3a4ae6c, checked in by Joel Sherrill <joel.sherrill@…>, on 09/11/95 at 19:35:39

The word "RTEMS" almost completely removed from the core.

Configuration Table Template file added and all tests
modified to use this. All gvar.h and conftbl.h files
removed from test directories.

Configuration parameter maximum_devices added.

Core semaphore and mutex handlers added and RTEMS API Semaphore
Manager updated to reflect this.

Initialization sequence changed to invoke API specific initialization
routines. Initialization tasks table now owned by RTEMS Tasks Manager.

Added user extension for post-switch.

Utilized user extensions to implement API specific functionality
like signal dispatching.

Added extensions to the System Initialization Thread so that an
API can register a function to be invoked while the system
is being initialized. These are largely equivalent to the
pre-driver and post-driver hooks.

Added the Modules file oar-go32_p5, modified oar-go32, and modified
the file make/custom/go32.cfg to look at an environment varable which
determines what CPU model is being used.

All BSPs updated to reflect named devices and clock driver's IOCTL
used by the Shared Memory Driver. Also merged clock isr into
main file and removed ckisr.c where possible.

Updated spsize to reflect new and moved variables.

Makefiles for the executive source and include files updated to show
break down of files into Core, RTEMS API, and Neither.

Header and inline files installed into subdirectory based on whether
logically in the Core or a part of the RTEMS API.

  • Property mode set to 100644
File size: 3.7 KB
Line 
1/*
2 *  Clock Manager
3 *
4 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
5 *  On-Line Applications Research Corporation (OAR).
6 *  All rights assigned to U.S. Government, 1994.
7 *
8 *  This material may be reproduced by or for the U.S. Government pursuant
9 *  to the copyright license under the clause at DFARS 252.227-7013.  This
10 *  notice must appear in all copies of this file and its derivatives.
11 *
12 *  $Id$
13 */
14
15#include <rtems/system.h>
16#include <rtems/rtems/status.h>
17#include <rtems/rtems/clock.h>
18#include <rtems/core/isr.h>
19#include <rtems/core/thread.h>
20#include <rtems/core/tod.h>
21#include <rtems/core/watchdog.h>
22
23/*PAGE
24 *
25 *  rtems_clock_get
26 *
27 *  This directive returns the current date and time.  If the time has
28 *  not been set by a tm_set then an error is returned.
29 *
30 *  Input parameters:
31 *    option      - which value to return
32 *    time_buffer - pointer to output buffer (a time and date structure
33 *                  or an interval)
34 *
35 *  Output parameters:
36 *    time_buffer      - output filled in
37 *    RTEMS_SUCCESSFUL - if successful
38 *    error code       - if unsuccessful
39 */
40
41rtems_status_code rtems_clock_get(
42  rtems_clock_get_options  option,
43  void                    *time_buffer
44)
45{
46  ISR_Level      level;
47  rtems_interval tmp;
48
49  switch ( option ) {
50    case RTEMS_CLOCK_GET_TOD:
51      if ( !_TOD_Is_set() )
52        return RTEMS_NOT_DEFINED;
53
54      *(rtems_time_of_day *)time_buffer = _TOD_Current;
55      return RTEMS_SUCCESSFUL;
56
57    case RTEMS_CLOCK_GET_SECONDS_SINCE_EPOCH:
58      if ( !_TOD_Is_set() )
59        return RTEMS_NOT_DEFINED;
60
61      *(rtems_interval *)time_buffer = _TOD_Seconds_since_epoch;
62      return RTEMS_SUCCESSFUL;
63
64    case RTEMS_CLOCK_GET_TICKS_SINCE_BOOT:
65      *(rtems_interval *)time_buffer = _TOD_Ticks_since_boot;
66      return RTEMS_SUCCESSFUL;
67
68    case RTEMS_CLOCK_GET_TICKS_PER_SECOND:
69      *(rtems_interval *)time_buffer = _TOD_Ticks_per_second;
70      return RTEMS_SUCCESSFUL;
71
72    case RTEMS_CLOCK_GET_TIME_VALUE:
73      if ( !_TOD_Is_set() )
74        return RTEMS_NOT_DEFINED;
75
76      _ISR_Disable( level );
77        ((rtems_clock_time_value *)time_buffer)->seconds =
78          _TOD_Seconds_since_epoch;
79        tmp = _TOD_Current.ticks;
80      _ISR_Enable( level );
81
82      tmp *= _TOD_Microseconds_per_tick;
83      ((rtems_clock_time_value *)time_buffer)->microseconds = tmp;
84
85      return RTEMS_SUCCESSFUL;
86  }
87
88  return RTEMS_INTERNAL_ERROR;   /* should never get here */
89
90}
91
92/*PAGE
93 *
94 *  rtems_clock_set
95 *
96 *  This directive sets the date and time for this node.
97 *
98 *  Input parameters:
99 *    time_buffer - pointer to the time and date structure
100 *
101 *  Output parameters:
102 *    RTEMS_SUCCESSFUL - if successful
103 *    error code        - if unsuccessful
104 */
105
106rtems_status_code rtems_clock_set(
107  rtems_time_of_day *time_buffer
108)
109{
110  rtems_interval     seconds;
111
112  if ( _TOD_Validate( time_buffer ) ) {
113    seconds = _TOD_To_seconds( time_buffer );
114    _Thread_Disable_dispatch();
115      _TOD_Set( time_buffer, seconds );
116    _Thread_Enable_dispatch();
117    return RTEMS_SUCCESSFUL;
118  }
119  return RTEMS_INVALID_CLOCK;
120}
121
122/*PAGE
123 *
124 *  rtems_clock_tick
125 *
126 *  This directive notifies the executve that a tick has occurred.
127 *  When the tick occurs the time manager updates and maintains
128 *  the calendar time, timeslicing, and any timeout delays.
129 *
130 *  Input parameters:  NONE
131 *
132 *  Output parameters:
133 *    RTEMS_SUCCESSFUL - always succeeds
134 *
135 *  NOTE: This routine only works for leap-years through 2099.
136 */
137
138rtems_status_code rtems_clock_tick( void )
139{
140  _TOD_Tickle_ticks();
141
142  _Watchdog_Tickle_ticks();
143
144  _Thread_Tickle_timeslice();
145
146  if ( _Thread_Is_context_switch_necessary() &&
147       _Thread_Is_dispatching_enabled() )
148    _Thread_Dispatch();
149
150  return RTEMS_SUCCESSFUL;
151}
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