/*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
+#include <stddef.h>
+#include <errno.h>
+#include <signal.h>
#include <time.h>
#include <sys/time.h>
-#include <signal.h>
-#include <errno.h>
-#include "user_util.h"
-#include "kern_util.h"
-#include "user.h"
-#include "process.h"
#include "kern_constants.h"
#include "os.h"
+#include "user.h"
-int set_interval(int is_virtual)
+static int is_real_timer = 0;
+
+int set_interval(void)
{
- int usec = 1000000/hz();
- int timer_type = is_virtual ? ITIMER_VIRTUAL : ITIMER_REAL;
+ int usec = 1000000/UM_HZ;
struct itimerval interval = ((struct itimerval) { { 0, usec },
{ 0, usec } });
- if(setitimer(timer_type, &interval, NULL) == -1)
+ if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
return -errno;
return 0;
}
-#ifdef CONFIG_MODE_TT
-void enable_timer(void)
-{
- set_interval(1);
-}
-#endif
-
void disable_timer(void)
{
struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
- if((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
- (setitimer(ITIMER_REAL, &disable, NULL) < 0))
- printk("disnable_timer - setitimer failed, errno = %d\n",
- errno);
+
+ if ((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
+ (setitimer(ITIMER_REAL, &disable, NULL) < 0))
+ printk(UM_KERN_ERR "disable_timer - setitimer failed, "
+ "errno = %d\n", errno);
+
/* If there are signals already queued, after unblocking ignore them */
signal(SIGALRM, SIG_IGN);
signal(SIGVTALRM, SIG_IGN);
}
-void switch_timers(int to_real)
+int switch_timers(int to_real)
{
struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
- struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() },
- { 0, 1000000/hz() }});
- int old, new;
+ struct itimerval enable;
+ int old, new, old_type = is_real_timer;
- if(to_real){
+ if(to_real == old_type)
+ return to_real;
+
+ if (to_real) {
old = ITIMER_VIRTUAL;
new = ITIMER_REAL;
}
new = ITIMER_VIRTUAL;
}
- if((setitimer(old, &disable, NULL) < 0) ||
- (setitimer(new, &enable, NULL)))
- printk("switch_timers - setitimer failed, errno = %d\n",
- errno);
-}
+ if (setitimer(old, &disable, &enable) < 0)
+ printk(UM_KERN_ERR "switch_timers - setitimer disable failed, "
+ "errno = %d\n", errno);
-#ifdef UML_CONFIG_MODE_TT
-void uml_idle_timer(void)
-{
- if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
- panic("Couldn't unset SIGVTALRM handler");
+ if((enable.it_value.tv_sec == 0) && (enable.it_value.tv_usec == 0))
+ enable.it_value = enable.it_interval;
+
+ if (setitimer(new, &enable, NULL))
+ printk(UM_KERN_ERR "switch_timers - setitimer enable failed, "
+ "errno = %d\n", errno);
- set_handler(SIGALRM, (__sighandler_t) alarm_handler,
- SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
- set_interval(0);
+ is_real_timer = to_real;
+ return old_type;
}
-#endif
unsigned long long os_nsecs(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
- return((unsigned long long) tv.tv_sec * BILLION + tv.tv_usec * 1000);
+ return (unsigned long long) tv.tv_sec * BILLION + tv.tv_usec * 1000;
}
void idle_sleep(int secs)