diff options
| author | Aurelien Jarno <aurelien@aurel32.net> | 2015-05-18 23:42:26 +0200 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2015-06-05 01:37:57 +0200 |
| commit | c941f07485e56e4b2653048e166b720428307acb (patch) | |
| tree | e10112765deda556107d0fc7d5defcffd96b472f | |
| parent | 9cb32c442e11d16b747fa07e29dd29b5d8227b57 (diff) | |
target-s390x: simplify SCKC helper
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>
| -rw-r--r-- | target-s390x/misc_helper.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c index 230bafdba2..120807f20b 100644 --- a/target-s390x/misc_helper.c +++ b/target-s390x/misc_helper.c @@ -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 */ |