time.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

#include <linux/config.h> /* CONFIG_HEARTBEAT */
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>

#include <asm/machdep.h>
#include <asm/io.h>

#include <linux/timex.h>

unsigned long m68k_get_rtc_time(void)
{
	unsigned int year, mon, day, hour, min, sec;

	extern void arch_gettod(int *year, int *mon, int *day, int *hour,
				int *min, int *sec);

	arch_gettod (&year, &mon, &day, &hour, &min, &sec);

	if ((year += 1900) < 1970)
		year += 100;

	return mktime(year, mon, day, hour, min, sec);
}

int m68k_set_rtc_time(unsigned long nowtime)
{
  if (mach_set_clock_mmss)
    return mach_set_clock_mmss (nowtime);
  return -1;
}

void apus_heartbeat (void)
{
#ifdef CONFIG_HEARTBEAT
	static unsigned cnt = 0, period = 0, dist = 0;

	if (cnt == 0 || cnt == dist)
                mach_heartbeat( 1 );
	else if (cnt == 7 || cnt == dist+7)
                mach_heartbeat( 0 );

	if (++cnt > period) {
                cnt = 0;
                /* The hyperbolic function below modifies the heartbeat period
                 * length in dependency of the current (5min) load. It goes
                 * through the points f(0)=126, f(1)=86, f(5)=51,
                 * f(inf)->30. */
                period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
                dist = period / 4;
	}
#endif
	/* should be made smarter */
	ppc_md.heartbeat_count = 1;
}