| /* |
| * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) |
| * Licensed under the GPL |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <time.h> |
| #include <sys/time.h> |
| #include <signal.h> |
| #include <errno.h> |
| #include "user_util.h" |
| #include "kern_util.h" |
| #include "user.h" |
| #include "process.h" |
| #include "signal_user.h" |
| #include "time_user.h" |
| |
| extern struct timeval xtime; |
| |
| struct timeval local_offset = { 0, 0 }; |
| |
| void timer(void) |
| { |
| gettimeofday(&xtime, NULL); |
| timeradd(&xtime, &local_offset, &xtime); |
| } |
| |
| void set_interval(int timer_type) |
| { |
| int usec = 1000000/hz(); |
| struct itimerval interval = ((struct itimerval) { { 0, usec }, |
| { 0, usec } }); |
| |
| if(setitimer(timer_type, &interval, NULL) == -1) |
| panic("setitimer failed - errno = %d\n", errno); |
| } |
| |
| void enable_timer(void) |
| { |
| int usec = 1000000/hz(); |
| struct itimerval enable = ((struct itimerval) { { 0, usec }, |
| { 0, usec }}); |
| if(setitimer(ITIMER_VIRTUAL, &enable, NULL)) |
| printk("enable_timer - setitimer failed, errno = %d\n", |
| errno); |
| } |
| |
| void disable_timer(void) |
| { |
| struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }}); |
| if((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) || |
| (setitimer(ITIMER_REAL, &disable, NULL) < 0)) |
| printk("disnable_timer - setitimer failed, errno = %d\n", |
| errno); |
| } |
| |
| void switch_timers(int to_real) |
| { |
| struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }}); |
| struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() }, |
| { 0, 1000000/hz() }}); |
| int old, new; |
| |
| if(to_real){ |
| old = ITIMER_VIRTUAL; |
| new = ITIMER_REAL; |
| } |
| else { |
| old = ITIMER_REAL; |
| new = ITIMER_VIRTUAL; |
| } |
| |
| if((setitimer(old, &disable, NULL) < 0) || |
| (setitimer(new, &enable, NULL))) |
| printk("switch_timers - setitimer failed, errno = %d\n", |
| errno); |
| } |
| |
| void idle_timer(void) |
| { |
| if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR) |
| panic("Couldn't unset SIGVTALRM handler"); |
| |
| set_handler(SIGALRM, (__sighandler_t) alarm_handler, |
| SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1); |
| set_interval(ITIMER_REAL); |
| } |
| |
| void time_init(void) |
| { |
| /* XXX This is to fill xtime with something real - otherwise by the |
| * time /proc is mounted, no timers have fired, and xtime is still 0, |
| * meaning it shows times of Jan 1 1970. The real fix is to figure |
| * out why no timers have happened by then. |
| */ |
| timer(); |
| |
| if(signal(SIGVTALRM, boot_timer_handler) == SIG_ERR) |
| panic("Couldn't set SIGVTALRM handler"); |
| set_interval(ITIMER_VIRTUAL); |
| } |
| |
| void do_gettimeofday(struct timeval *tv) |
| { |
| unsigned long flags; |
| |
| flags = time_lock(); |
| gettimeofday(tv, NULL); |
| timeradd(tv, &local_offset, tv); |
| time_unlock(flags); |
| } |
| |
| void do_settimeofday(struct timeval *tv) |
| { |
| struct timeval now; |
| unsigned long flags; |
| |
| flags = time_lock(); |
| gettimeofday(&now, NULL); |
| timersub(tv, &now, &local_offset); |
| time_unlock(flags); |
| } |
| |
| void idle_sleep(int secs) |
| { |
| struct timespec ts; |
| |
| ts.tv_sec = secs; |
| ts.tv_nsec = 0; |
| nanosleep(&ts, NULL); |
| } |
| |
| /* |
| * Overrides for Emacs so that we follow Linus's tabbing style. |
| * Emacs will notice this stuff at the end of the file and automatically |
| * adjust the settings for this buffer only. This must remain at the end |
| * of the file. |
| * --------------------------------------------------------------------------- |
| * Local variables: |
| * c-file-style: "linux" |
| * End: |
| */ |