2006-01-19 09:42:42 +08:00
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/*
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2007-10-16 16:26:54 +08:00
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
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2006-01-19 09:42:42 +08:00
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* Licensed under the GPL
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*/
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2007-10-16 16:26:54 +08:00
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#include <stddef.h>
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#include <errno.h>
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#include <signal.h>
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2006-01-19 09:42:42 +08:00
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#include <time.h>
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2005-04-17 06:20:36 +08:00
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#include <sys/time.h>
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2006-01-19 09:42:42 +08:00
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#include "kern_constants.h"
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#include "os.h"
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2007-10-16 16:26:54 +08:00
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#include "user.h"
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2006-01-19 09:42:42 +08:00
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2007-10-16 16:27:22 +08:00
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static int is_real_timer = 0;
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2007-10-16 16:27:22 +08:00
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int set_interval(void)
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2006-01-19 09:42:42 +08:00
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{
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2007-10-16 16:27:21 +08:00
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int usec = 1000000/UM_HZ;
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2006-01-19 09:42:42 +08:00
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struct itimerval interval = ((struct itimerval) { { 0, usec },
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{ 0, usec } });
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2007-10-16 16:27:22 +08:00
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if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
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2006-09-26 14:33:05 +08:00
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return -errno;
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return 0;
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2006-01-19 09:42:42 +08:00
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}
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2007-10-16 16:27:25 +08:00
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int timer_one_shot(int ticks)
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{
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unsigned long usec = ticks * 1000000 / UM_HZ;
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unsigned long sec = usec / 1000000;
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struct itimerval interval;
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usec %= 1000000;
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interval = ((struct itimerval) { { 0, 0 }, { sec, usec } });
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if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
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return -errno;
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return 0;
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}
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2006-01-19 09:42:42 +08:00
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void disable_timer(void)
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{
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struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
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2007-10-16 16:26:54 +08:00
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if ((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
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(setitimer(ITIMER_REAL, &disable, NULL) < 0))
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printk(UM_KERN_ERR "disable_timer - setitimer failed, "
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"errno = %d\n", errno);
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2006-01-19 09:42:42 +08:00
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}
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2007-10-16 16:27:22 +08:00
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int switch_timers(int to_real)
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2006-01-19 09:42:42 +08:00
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{
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struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
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2007-10-16 16:27:22 +08:00
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struct itimerval enable;
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int old, new, old_type = is_real_timer;
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if(to_real == old_type)
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return to_real;
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2006-01-19 09:42:42 +08:00
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2007-10-16 16:26:54 +08:00
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if (to_real) {
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2006-01-19 09:42:42 +08:00
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old = ITIMER_VIRTUAL;
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new = ITIMER_REAL;
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}
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else {
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old = ITIMER_REAL;
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new = ITIMER_VIRTUAL;
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}
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2007-10-16 16:27:22 +08:00
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if (setitimer(old, &disable, &enable) < 0)
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printk(UM_KERN_ERR "switch_timers - setitimer disable failed, "
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"errno = %d\n", errno);
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if((enable.it_value.tv_sec == 0) && (enable.it_value.tv_usec == 0))
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enable.it_value = enable.it_interval;
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if (setitimer(new, &enable, NULL))
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printk(UM_KERN_ERR "switch_timers - setitimer enable failed, "
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2007-10-16 16:26:54 +08:00
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"errno = %d\n", errno);
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2007-10-16 16:27:22 +08:00
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is_real_timer = to_real;
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return old_type;
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2006-01-19 09:42:42 +08:00
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}
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2005-04-17 06:20:36 +08:00
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2006-01-19 09:42:42 +08:00
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unsigned long long os_nsecs(void)
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2005-04-17 06:20:36 +08:00
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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2007-10-16 16:27:25 +08:00
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return timeval_to_ns(&tv);
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2005-04-17 06:20:36 +08:00
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}
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2006-01-19 09:42:42 +08:00
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void idle_sleep(int secs)
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{
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struct timespec ts;
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ts.tv_sec = secs;
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ts.tv_nsec = 0;
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nanosleep(&ts, NULL);
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}
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