Gennady Sharapov | cff65c4 | 2006-01-18 17:42:42 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) |
| 3 | * Licensed under the GPL |
| 4 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | |
Gennady Sharapov | cff65c4 | 2006-01-18 17:42:42 -0800 | [diff] [blame^] | 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <unistd.h> |
| 9 | #include <time.h> |
| 10 | #include <sys/time.h> |
| 11 | #include <signal.h> |
| 12 | #include <errno.h> |
| 13 | #include "user_util.h" |
| 14 | #include "kern_util.h" |
| 15 | #include "user.h" |
| 16 | #include "process.h" |
| 17 | #include "kern_constants.h" |
| 18 | #include "os.h" |
| 19 | |
| 20 | /* XXX This really needs to be declared and initialized in a kernel file since |
| 21 | * it's in <linux/time.h> |
| 22 | */ |
| 23 | extern struct timespec wall_to_monotonic; |
| 24 | |
| 25 | static void set_interval(int timer_type) |
| 26 | { |
| 27 | int usec = 1000000/hz(); |
| 28 | struct itimerval interval = ((struct itimerval) { { 0, usec }, |
| 29 | { 0, usec } }); |
| 30 | |
| 31 | if(setitimer(timer_type, &interval, NULL) == -1) |
| 32 | panic("setitimer failed - errno = %d\n", errno); |
| 33 | } |
| 34 | |
| 35 | void enable_timer(void) |
| 36 | { |
| 37 | set_interval(ITIMER_VIRTUAL); |
| 38 | } |
| 39 | |
| 40 | void disable_timer(void) |
| 41 | { |
| 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", |
| 46 | errno); |
| 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); |
| 50 | } |
| 51 | |
| 52 | void switch_timers(int to_real) |
| 53 | { |
| 54 | struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }}); |
| 55 | struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() }, |
| 56 | { 0, 1000000/hz() }}); |
| 57 | int old, new; |
| 58 | |
| 59 | if(to_real){ |
| 60 | old = ITIMER_VIRTUAL; |
| 61 | new = ITIMER_REAL; |
| 62 | } |
| 63 | else { |
| 64 | old = ITIMER_REAL; |
| 65 | new = ITIMER_VIRTUAL; |
| 66 | } |
| 67 | |
| 68 | if((setitimer(old, &disable, NULL) < 0) || |
| 69 | (setitimer(new, &enable, NULL))) |
| 70 | printk("switch_timers - setitimer failed, errno = %d\n", |
| 71 | errno); |
| 72 | } |
| 73 | |
| 74 | void uml_idle_timer(void) |
| 75 | { |
| 76 | if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR) |
| 77 | panic("Couldn't unset SIGVTALRM handler"); |
| 78 | |
| 79 | set_handler(SIGALRM, (__sighandler_t) alarm_handler, |
| 80 | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1); |
| 81 | set_interval(ITIMER_REAL); |
| 82 | } |
| 83 | |
| 84 | extern void ktime_get_ts(struct timespec *ts); |
| 85 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
| 86 | |
| 87 | void time_init(void) |
| 88 | { |
| 89 | struct timespec now; |
| 90 | |
| 91 | if(signal(SIGVTALRM, boot_timer_handler) == SIG_ERR) |
| 92 | panic("Couldn't set SIGVTALRM handler"); |
| 93 | set_interval(ITIMER_VIRTUAL); |
| 94 | |
| 95 | do_posix_clock_monotonic_gettime(&now); |
| 96 | wall_to_monotonic.tv_sec = -now.tv_sec; |
| 97 | wall_to_monotonic.tv_nsec = -now.tv_nsec; |
| 98 | } |
| 99 | |
| 100 | unsigned long long os_nsecs(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | { |
| 102 | struct timeval tv; |
| 103 | |
| 104 | gettimeofday(&tv, NULL); |
Gennady Sharapov | cff65c4 | 2006-01-18 17:42:42 -0800 | [diff] [blame^] | 105 | return((unsigned long long) tv.tv_sec * BILLION + tv.tv_usec * 1000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
Gennady Sharapov | cff65c4 | 2006-01-18 17:42:42 -0800 | [diff] [blame^] | 108 | void idle_sleep(int secs) |
| 109 | { |
| 110 | struct timespec ts; |
| 111 | |
| 112 | ts.tv_sec = secs; |
| 113 | ts.tv_nsec = 0; |
| 114 | nanosleep(&ts, NULL); |
| 115 | } |
| 116 | |
| 117 | /* XXX This partly duplicates init_irq_signals */ |
| 118 | |
| 119 | void user_time_init(void) |
| 120 | { |
| 121 | set_handler(SIGVTALRM, (__sighandler_t) alarm_handler, |
| 122 | SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, |
| 123 | SIGALRM, SIGUSR2, -1); |
| 124 | set_handler(SIGALRM, (__sighandler_t) alarm_handler, |
| 125 | SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, |
| 126 | SIGVTALRM, SIGUSR2, -1); |
| 127 | set_interval(ITIMER_VIRTUAL); |
| 128 | } |