2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
13 #include "user_util.h"
14 #include "kern_util.h"
17 #include "kern_constants.h"
20 /* XXX This really needs to be declared and initialized in a kernel file since
21 * it's in <linux/time.h>
23 extern struct timespec wall_to_monotonic
;
25 static void set_interval(int timer_type
)
27 int usec
= 1000000/hz();
28 struct itimerval interval
= ((struct itimerval
) { { 0, usec
},
31 if(setitimer(timer_type
, &interval
, NULL
) == -1)
32 panic("setitimer failed - errno = %d\n", errno
);
35 void enable_timer(void)
37 set_interval(ITIMER_VIRTUAL
);
40 void disable_timer(void)
42 struct itimerval disable
= ((struct itimerval
) { { 0, 0 }, { 0, 0 }});
43 if((setitimer(ITIMER_VIRTUAL
, &disable
, NULL
) < 0) ||
44 (setitimer(ITIMER_REAL
, &disable
, NULL
) < 0))
45 printk("disnable_timer - setitimer failed, errno = %d\n",
47 /* If there are signals already queued, after unblocking ignore them */
48 set_handler(SIGALRM
, SIG_IGN
, 0, -1);
49 set_handler(SIGVTALRM
, SIG_IGN
, 0, -1);
52 void switch_timers(int to_real
)
54 struct itimerval disable
= ((struct itimerval
) { { 0, 0 }, { 0, 0 }});
55 struct itimerval enable
= ((struct itimerval
) { { 0, 1000000/hz() },
56 { 0, 1000000/hz() }});
68 if((setitimer(old
, &disable
, NULL
) < 0) ||
69 (setitimer(new, &enable
, NULL
)))
70 printk("switch_timers - setitimer failed, errno = %d\n",
74 void uml_idle_timer(void)
76 if(signal(SIGVTALRM
, SIG_IGN
) == SIG_ERR
)
77 panic("Couldn't unset SIGVTALRM handler");
79 set_handler(SIGALRM
, (__sighandler_t
) alarm_handler
,
80 SA_RESTART
, SIGUSR1
, SIGIO
, SIGWINCH
, SIGVTALRM
, -1);
81 set_interval(ITIMER_REAL
);
86 if(signal(SIGVTALRM
, boot_timer_handler
) == SIG_ERR
)
87 panic("Couldn't set SIGVTALRM handler");
88 set_interval(ITIMER_VIRTUAL
);
92 unsigned long long os_nsecs(void)
96 gettimeofday(&tv
, NULL
);
97 return((unsigned long long) tv
.tv_sec
* BILLION
+ tv
.tv_usec
* 1000);
100 void idle_sleep(int secs
)
106 nanosleep(&ts
, NULL
);
109 /* XXX This partly duplicates init_irq_signals */
111 void user_time_init(void)
113 set_handler(SIGVTALRM
, (__sighandler_t
) alarm_handler
,
114 SA_ONSTACK
| SA_RESTART
, SIGUSR1
, SIGIO
, SIGWINCH
,
115 SIGALRM
, SIGUSR2
, -1);
116 set_handler(SIGALRM
, (__sighandler_t
) alarm_handler
,
117 SA_ONSTACK
| SA_RESTART
, SIGUSR1
, SIGIO
, SIGWINCH
,
118 SIGVTALRM
, SIGUSR2
, -1);
119 set_interval(ITIMER_VIRTUAL
);