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target-s390x: simplify SCKC helper

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The clock comparator and the QEMU timer work the same way, triggering
at a given time, they just differ by the origin and the scale. It is
therefore possible to go from one to another without using the current
clock value. This spares two calls to qemu_clock_get_ns, which probably
return slightly different values, possibly reducing the accuracy.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aurelien Jarno 2015-05-18 23:42:26 +02:00 • committed by Alexander Graf
parent 9cb32c442e
commit c941f07485
1 changed files with 4 additions and 3 deletions
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7
target-s390x/misc_helper.c
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@ -291,12 +291,13 @@ void HELPER(sckc)(CPUS390XState *env, uint64_t time)
return;
}
/* difference between now and then */
time -= clock_value(env);
/* difference between origins */
time -= env->tod_offset;
/* nanoseconds */
time = tod2time(time);
timer_mod(env->tod_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time);
timer_mod(env->tod_timer, env->tod_basetime + time);
}
/* Store Clock Comparator */