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target-alpha: Add high-resolution access to wall clock and an alarm.

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The alarm is a fully general one-shot time comparator, which will be
usable under Linux as a hrtimer source.  It's much more flexible than
the RTC source available on real hardware.

The wall clock allows the guest access to the host timekeeping.  Much
like the KVM wall clock source for other guests.

Both are accessed via the PALcode Cserve entry point.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2011-04-28 10:40:08 -07:00
parent 034ebc2753
commit c781cf96e2
5 changed files with 68 additions and 5 deletions
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15
target-alpha/op_helper.c
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@ -1228,6 +1228,21 @@ void helper_halt(uint64_t restart)
qemu_system_shutdown_request();
}
}
uint64_t helper_get_time(void)
{
return qemu_get_clock_ns(rtc_clock);
}
void helper_set_alarm(uint64_t expire)
{
if (expire) {
env->alarm_expire = expire;
qemu_mod_timer(env->alarm_timer, expire);
} else {
qemu_del_timer(env->alarm_timer);
}
}
#endif
/*****************************************************************************/