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System time functions/interface.
rtc driver fills struct sysrtcops with its own callbacks, allowing to machine-independent
time-related manipulations.
sysclock_init() programms RTC hardware with HZ;
sysclock() will be called by RTC intr handler (in IRQ mode) and update timedata with seconds past Epoch.

Still more work to do; now it just prints system time from sysclock().

/*
 * $Id: kern_time.c,v 1.1 2007/11/06 22:52:39 init Exp $
 */
#include <sys/types.h>
#include <sys/kern_time.h>
#include <libkern/printf.h>

/*
 * Kernel time-related stuff.
 */

struct rtcops 	sysrtcops = {NULL, NULL, NULL};	/* system will use this to control rtc hardware */
struct timedata systimedata;


void
sysclock_init(void)
{
	/*
	 * Start system clock.
	 */
	/* panic if driver haven't configured rtcops for us */
	if (sysrtcops.ro_sethz == NULL)
		panic("sysclock_init: clock init failed; can't find rtc driver entry points (sysrtcops is null)\n");

	/* configure hardware */
	sysrtcops.ro_sethz(HZ);

}


void
sysclock(void)
{
	/*
	 * Process one system tick.
	 * RTC interrupt handler will call us; remember that we are in interrupt mode here.
	 */

	/* update time data */
	systimedata.td_seconds = sysrtcops.ro_getsec();

	/* TODO kick scheduler */

	printf("sysclock! td_seconds = %d\n", systimedata.td_seconds);
}