1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/* Clock
*
* This routine initializes the interval timer on the
* PA-RISC CPU. The tick frequency is specified by the bsp.
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* $Id$
*/
#include <rtems.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <time.h>
extern rtems_configuration_table Configuration;
extern sigset_t UNIX_SIGNAL_MASK;
/*
* Function prototypes
*/
void Install_clock();
void Clock_isr();
void Clock_exit();
/*
* CPU_HPPA_CLICKS_PER_TICK is either a #define or an rtems_unsigned32
* allocated and set by bsp_start()
*/
#ifndef CPU_HPPA_CLICKS_PER_TICK
extern rtems_unsigned32 CPU_HPPA_CLICKS_PER_TICK;
#endif
volatile rtems_unsigned32 Clock_driver_ticks;
struct itimerval new;
rtems_device_driver
Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp,
rtems_id tid,
rtems_unsigned32 *rval
)
{
Install_clock(Clock_isr);
}
void
ReInstall_clock(rtems_isr_entry new_clock_isr)
{
rtems_unsigned32 isrlevel = 0;
rtems_interrupt_disable(isrlevel);
(void)set_vector(new_clock_isr, SIGALRM, 1);
rtems_interrupt_enable(isrlevel);
}
void
Install_clock(rtems_isr_entry clock_isr)
{
Clock_driver_ticks = 0;
new.it_value.tv_sec = 0;
new.it_value.tv_usec = Configuration.microseconds_per_tick;
new.it_interval.tv_sec = 0;
new.it_interval.tv_usec = Configuration.microseconds_per_tick;
(void)set_vector(clock_isr, SIGALRM, 1);
setitimer(ITIMER_REAL, &new, 0);
atexit(Clock_exit);
}
void
Clock_isr(int vector)
{
Clock_driver_ticks++;
rtems_clock_tick();
}
/*
* Called via atexit()
* Remove the clock signal
*/
void
Clock_exit(void)
{
struct sigaction act;
/*
* Set the SIGALRM signal to ignore any last
* signals that might come in while we are
* disarming the timer and removing the interrupt
* vector.
*/
act.sa_handler = SIG_IGN;
sigaction(SIGALRM, &act, 0);
new.it_value.tv_sec = 0;
new.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &new, 0);
(void)set_vector(0, SIGALRM, 1);
}
|