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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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aceb343464
This cleans up the mess that is the timer initialization. There used to be two timer handlers - one that basically ran during delay loop calibration and one that handled the timer afterwards. There were also two sets of timer initialization code - one that starts in user code and calls into the kernel side of the house, and one that starts in kernel code and calls user code. This eliminates one timer handler and consolidates the two sets of initialization code. [akpm@osdl.org: use new INTF_ flags] Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <errno.h>
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#include "user_util.h"
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#include "kern_util.h"
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#include "user.h"
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#include "process.h"
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#include "kern_constants.h"
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#include "os.h"
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/* XXX This really needs to be declared and initialized in a kernel file since
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* it's in <linux/time.h>
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*/
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extern struct timespec wall_to_monotonic;
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static void set_interval(int timer_type)
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{
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int usec = 1000000/hz();
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struct itimerval interval = ((struct itimerval) { { 0, usec },
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{ 0, usec } });
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if(setitimer(timer_type, &interval, NULL) == -1)
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panic("setitimer failed - errno = %d\n", errno);
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}
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void enable_timer(void)
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{
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set_interval(ITIMER_VIRTUAL);
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}
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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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if((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
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(setitimer(ITIMER_REAL, &disable, NULL) < 0))
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printk("disnable_timer - setitimer failed, errno = %d\n",
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errno);
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/* If there are signals already queued, after unblocking ignore them */
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set_handler(SIGALRM, SIG_IGN, 0, -1);
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set_handler(SIGVTALRM, SIG_IGN, 0, -1);
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}
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void switch_timers(int to_real)
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{
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struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
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struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() },
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{ 0, 1000000/hz() }});
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int old, new;
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if(to_real){
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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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if((setitimer(old, &disable, NULL) < 0) ||
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(setitimer(new, &enable, NULL)))
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printk("switch_timers - setitimer failed, errno = %d\n",
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errno);
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}
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void uml_idle_timer(void)
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{
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if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
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panic("Couldn't unset SIGVTALRM handler");
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set_handler(SIGALRM, (__sighandler_t) alarm_handler,
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SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
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set_interval(ITIMER_REAL);
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}
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unsigned long long os_nsecs(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return((unsigned long long) tv.tv_sec * BILLION + tv.tv_usec * 1000);
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}
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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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void user_time_init(void)
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{
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set_interval(ITIMER_VIRTUAL);
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}
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