diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/um/os-Linux/time.c')
-rw-r--r-- | ANDROID_3.4.5/arch/um/os-Linux/time.c | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/ANDROID_3.4.5/arch/um/os-Linux/time.c b/ANDROID_3.4.5/arch/um/os-Linux/time.c deleted file mode 100644 index 910499d7..00000000 --- a/ANDROID_3.4.5/arch/um/os-Linux/time.c +++ /dev/null @@ -1,186 +0,0 @@ -/* - * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com) - * Licensed under the GPL - */ - -#include <stddef.h> -#include <errno.h> -#include <signal.h> -#include <time.h> -#include <sys/time.h> -#include "kern_util.h" -#include "os.h" -#include "internal.h" - -int set_interval(void) -{ - int usec = UM_USEC_PER_SEC / UM_HZ; - struct itimerval interval = ((struct itimerval) { { 0, usec }, - { 0, usec } }); - - if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1) - return -errno; - - return 0; -} - -int timer_one_shot(int ticks) -{ - unsigned long usec = ticks * UM_USEC_PER_SEC / UM_HZ; - unsigned long sec = usec / UM_USEC_PER_SEC; - struct itimerval interval; - - usec %= UM_USEC_PER_SEC; - interval = ((struct itimerval) { { 0, 0 }, { sec, usec } }); - - if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1) - return -errno; - - return 0; -} - -/** - * timeval_to_ns - Convert timeval to nanoseconds - * @ts: pointer to the timeval variable to be converted - * - * Returns the scalar nanosecond representation of the timeval - * parameter. - * - * Ripped from linux/time.h because it's a kernel header, and thus - * unusable from here. - */ -static inline long long timeval_to_ns(const struct timeval *tv) -{ - return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) + - tv->tv_usec * UM_NSEC_PER_USEC; -} - -long long disable_timer(void) -{ - struct itimerval time = ((struct itimerval) { { 0, 0 }, { 0, 0 } }); - long long remain, max = UM_NSEC_PER_SEC / UM_HZ; - - if (setitimer(ITIMER_VIRTUAL, &time, &time) < 0) - printk(UM_KERN_ERR "disable_timer - setitimer failed, " - "errno = %d\n", errno); - - remain = timeval_to_ns(&time.it_value); - if (remain > max) - remain = max; - - return remain; -} - -long long os_nsecs(void) -{ - struct timeval tv; - - gettimeofday(&tv, NULL); - return timeval_to_ns(&tv); -} - -#ifdef UML_CONFIG_NO_HZ -static int after_sleep_interval(struct timespec *ts) -{ - return 0; -} - -static void deliver_alarm(void) -{ - alarm_handler(SIGVTALRM, NULL); -} - -static unsigned long long sleep_time(unsigned long long nsecs) -{ - return nsecs; -} - -#else -unsigned long long last_tick; -unsigned long long skew; - -static void deliver_alarm(void) -{ - unsigned long long this_tick = os_nsecs(); - int one_tick = UM_NSEC_PER_SEC / UM_HZ; - - /* Protection against the host's time going backwards */ - if ((last_tick != 0) && (this_tick < last_tick)) - this_tick = last_tick; - - if (last_tick == 0) - last_tick = this_tick - one_tick; - - skew += this_tick - last_tick; - - while (skew >= one_tick) { - alarm_handler(SIGVTALRM, NULL); - skew -= one_tick; - } - - last_tick = this_tick; -} - -static unsigned long long sleep_time(unsigned long long nsecs) -{ - return nsecs > skew ? nsecs - skew : 0; -} - -static inline long long timespec_to_us(const struct timespec *ts) -{ - return ((long long) ts->tv_sec * UM_USEC_PER_SEC) + - ts->tv_nsec / UM_NSEC_PER_USEC; -} - -static int after_sleep_interval(struct timespec *ts) -{ - int usec = UM_USEC_PER_SEC / UM_HZ; - long long start_usecs = timespec_to_us(ts); - struct timeval tv; - struct itimerval interval; - - /* - * It seems that rounding can increase the value returned from - * setitimer to larger than the one passed in. Over time, - * this will cause the remaining time to be greater than the - * tick interval. If this happens, then just reduce the first - * tick to the interval value. - */ - if (start_usecs > usec) - start_usecs = usec; - - start_usecs -= skew / UM_NSEC_PER_USEC; - if (start_usecs < 0) - start_usecs = 0; - - tv = ((struct timeval) { .tv_sec = start_usecs / UM_USEC_PER_SEC, - .tv_usec = start_usecs % UM_USEC_PER_SEC }); - interval = ((struct itimerval) { { 0, usec }, tv }); - - if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1) - return -errno; - - return 0; -} -#endif - -void idle_sleep(unsigned long long nsecs) -{ - struct timespec ts; - - /* - * nsecs can come in as zero, in which case, this starts a - * busy loop. To prevent this, reset nsecs to the tick - * interval if it is zero. - */ - if (nsecs == 0) - nsecs = UM_NSEC_PER_SEC / UM_HZ; - - nsecs = sleep_time(nsecs); - ts = ((struct timespec) { .tv_sec = nsecs / UM_NSEC_PER_SEC, - .tv_nsec = nsecs % UM_NSEC_PER_SEC }); - - if (nanosleep(&ts, &ts) == 0) - deliver_alarm(); - after_sleep_interval(&ts); -} |