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 "signal_user.h"
18 #include "time_user.h"
19 #include "kern_constants.h"
21 /* XXX This really needs to be declared and initialized in a kernel file since
22 * it's in <linux/time.h>
24 extern struct timespec wall_to_monotonic;
26 extern struct timeval xtime;
28 struct timeval local_offset = { 0, 0 };
32 gettimeofday(&xtime, NULL);
33 timeradd(&xtime, &local_offset, &xtime);
36 void set_interval(int timer_type)
38 int usec = 1000000/hz();
39 struct itimerval interval = ((struct itimerval) { { 0, usec },
42 if(setitimer(timer_type, &interval, NULL) == -1)
43 panic("setitimer failed - errno = %d\n", errno);
46 void enable_timer(void)
48 int usec = 1000000/hz();
49 struct itimerval enable = ((struct itimerval) { { 0, usec },
51 if(setitimer(ITIMER_VIRTUAL, &enable, NULL))
52 printk("enable_timer - setitimer failed, errno = %d\n",
56 void switch_timers(int to_real)
58 struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
59 struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() },
60 { 0, 1000000/hz() }});
72 if((setitimer(old, &disable, NULL) < 0) ||
73 (setitimer(new, &enable, NULL)))
74 printk("switch_timers - setitimer failed, errno = %d\n",
78 void uml_idle_timer(void)
80 if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
81 panic("Couldn't unset SIGVTALRM handler");
83 set_handler(SIGALRM, (__sighandler_t) alarm_handler,
84 SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
85 set_interval(ITIMER_REAL);
88 static unsigned long long get_host_hz(void)
90 char mhzline[16], *end;
91 int ret, mult, mhz, rest, len;
93 ret = cpu_feature("cpu MHz", mhzline,
94 sizeof(mhzline) / sizeof(mhzline[0]));
96 panic ("Could not get host MHZ");
98 mhz = strtoul(mhzline, &end, 10);
100 /* This business is to parse a floating point number without using
113 rest = strtoul(end, NULL, 10);
118 return(1000000 * mhz + rest);
121 unsigned long long host_hz = 0;
123 extern int do_posix_clock_monotonic_gettime(struct timespec *tp);
129 host_hz = get_host_hz();
130 if(signal(SIGVTALRM, boot_timer_handler) == SIG_ERR)
131 panic("Couldn't set SIGVTALRM handler");
132 set_interval(ITIMER_VIRTUAL);
134 do_posix_clock_monotonic_gettime(&now);
135 wall_to_monotonic.tv_sec = -now.tv_sec;
136 wall_to_monotonic.tv_nsec = -now.tv_nsec;
139 void do_gettimeofday(struct timeval *tv)
144 gettimeofday(tv, NULL);
145 timeradd(tv, &local_offset, tv);
150 int do_settimeofday(struct timespec *tv)
154 struct timeval tv_in;
156 if ((unsigned long) tv->tv_nsec >= UM_NSEC_PER_SEC)
159 tv_in.tv_sec = tv->tv_sec;
160 tv_in.tv_usec = tv->tv_nsec / 1000;
163 gettimeofday(&now, NULL);
164 timersub(&tv_in, &now, &local_offset);
170 void idle_sleep(int secs)
176 nanosleep(&ts, NULL);
180 * Overrides for Emacs so that we follow Linus's tabbing style.
181 * Emacs will notice this stuff at the end of the file and automatically
182 * adjust the settings for this buffer only. This must remain at the end
184 * ---------------------------------------------------------------------------
186 * c-file-style: "linux"