1 /* 2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 4 */ 5 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 void time_init(void) 85 { 86 if(signal(SIGVTALRM, boot_timer_handler) == SIG_ERR) 87 panic("Couldn't set SIGVTALRM handler"); 88 set_interval(ITIMER_VIRTUAL); 89 time_init_kern(); 90 } 91 92 unsigned long long os_nsecs(void) 93 { 94 struct timeval tv; 95 96 gettimeofday(&tv, NULL); 97 return((unsigned long long) tv.tv_sec * BILLION + tv.tv_usec * 1000); 98 } 99 100 void idle_sleep(int secs) 101 { 102 struct timespec ts; 103 104 ts.tv_sec = secs; 105 ts.tv_nsec = 0; 106 nanosleep(&ts, NULL); 107 } 108 109 /* XXX This partly duplicates init_irq_signals */ 110 111 void user_time_init(void) 112 { 113 set_handler(SIGVTALRM, (__sighandler_t) alarm_handler, 114 SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, 115 SIGALRM, SIGUSR2, -1); 116 set_handler(SIGALRM, (__sighandler_t) alarm_handler, 117 SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, 118 SIGVTALRM, SIGUSR2, -1); 119 set_interval(ITIMER_VIRTUAL); 120 } 121