source: rtems/c/src/lib/libbsp/i960/cvme961/clock/ckinit.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: 3.1 KB
Line 
1/*  Clock_init()
2 *
3 *  This routine initializes the timer on the VIC chip on the CVME961.
4 *  The tick frequency is 1 millisecond.
5 *
6 *  Input parameters:  NONE
7 *
8 *  Output parameters:  NONE
9 *
10 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
11 *  On-Line Applications Research Corporation (OAR).
12 *  All rights assigned to U.S. Government, 1994.
13 *
14 *  This material may be reproduced by or for the U.S. Government pursuant
15 *  to the copyright license under the clause at DFARS 252.227-7013.  This
16 *  notice must appear in all copies of this file and its derivatives.
17 *
18 *  $Id$
19 */
20
21#include <stdlib.h>
22
23#include <bsp.h>
24#include <rtems/libio.h>
25
26#define CLOCK_VECTOR 5
27
28rtems_unsigned32 Clock_isrs;              /* ISRs until next tick */
29i960_isr_entry   Old_ticker;
30volatile rtems_unsigned32 Clock_driver_ticks;
31                                          /* ticks since initialization */
32
33void Clock_exit( void );
34 
35/*
36 * These are set by clock driver during its init
37 */
38 
39rtems_device_major_number rtems_clock_major = ~0;
40rtems_device_minor_number rtems_clock_minor;
41
42
43/* this is later in the file to avoid it being inlined */
44rtems_isr Clock_isr( rtems_vector_number vector );
45
46void Install_clock(
47  rtems_isr_entry clock_isr
48)
49{
50  volatile unsigned char *victimer;
51
52  Clock_driver_ticks = 0;
53  Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
54
55  if ( BSP_Configuration.ticks_per_timeslice ) {
56    Old_ticker = set_vector( clock_isr, CLOCK_VECTOR, 1 );
57    victimer = (volatile unsigned char *) 0xa00000c3;
58    *victimer = 0x12;
59    *victimer = 0x92;      /* 1000 HZ */
60  }
61}
62
63void ReInstall_clock(
64  rtems_isr_entry clock_isr
65)
66{
67   (void) set_vector( clock_isr, CLOCK_VECTOR, 1 );
68}
69
70void Clock_exit()
71{
72  unsigned char *victimer;
73
74  if ( BSP_Configuration.ticks_per_timeslice ) {
75    victimer = (unsigned char *) 0xa00000c3;
76    *victimer = 0x12;
77    i960_mask_intr( 5 );
78    /* do not restore old vector */
79  }
80}
81
82rtems_device_driver Clock_initialize(
83  rtems_device_major_number major,
84  rtems_device_minor_number minor,
85  void *pargp
86)
87{
88  Install_clock( Clock_isr );
89 
90  atexit( Clock_exit );
91
92  /*
93   * make major/minor avail to others such as shared memory driver
94   */
95 
96  rtems_clock_major = major;
97  rtems_clock_minor = minor;
98 
99  return RTEMS_SUCCESSFUL;
100}
101 
102rtems_device_driver Clock_control(
103  rtems_device_major_number major,
104  rtems_device_minor_number minor,
105  void *pargp
106)
107{
108    rtems_libio_ioctl_args_t *args = pargp;
109 
110    if (args == 0)
111        goto done;
112 
113    /*
114     * This is hokey, but until we get a defined interface
115     * to do this, it will just be this simple...
116     */
117 
118    if (args->command == rtems_build_name('I', 'S', 'R', ' '))
119    {
120        Clock_isr(CLOCK_VECTOR);
121    }
122    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
123    {
124        ReInstall_clock(args->buffer);
125    }
126 
127done:
128    return RTEMS_SUCCESSFUL;
129}
130
131rtems_isr Clock_isr(
132  rtems_vector_number vector
133)
134{
135  /* enable_tracing(); */
136  Clock_driver_ticks += 1;
137  if ( Clock_isrs == 1 ) {
138    rtems_clock_tick();
139    Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
140  }
141  else
142    Clock_isrs -= 1;
143  i960_clear_intr( 5 );
144}
145
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