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[Qemu-devel] [PULL 06/34] target-s390x: simplify SCKC helper
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PULL 06/34] target-s390x: simplify SCKC helper |
Date: |
Fri, 5 Jun 2015 01:41:36 +0200 |
From: Aurelien Jarno <address@hidden>
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 <address@hidden>
Signed-off-by: Alexander Graf <address@hidden>
---
target-s390x/misc_helper.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c
index 230bafd..120807f 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 */
--
1.7.12.4
- [Qemu-devel] [PULL 00/34] s390 patch queue 2015-06-05, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 08/34] target-s390x: implement STCKC helper, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 06/34] target-s390x: simplify SCKC helper,
Alexander Graf <=
- [Qemu-devel] [PULL 07/34] target-s390x: streamline STCK helper, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 04/34] target-s390x: remove unused helpers, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 05/34] target-s390x: add a tod2time function, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 02/34] target-s390x: fix CC computation for LOAD POSITIVE instructions, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 09/34] target-s390x: implement STPT helper, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 14/34] target-s390x: silence NaNs for LOAD LENGTHENED and LOAD ROUNDED, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 16/34] target-s390x: move a few instructions to the correct facility, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 20/34] target-s390x: change CHRL and CGHRL format to RIL-b, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 30/34] target-s390x: add a cpu_mmu_idx_to_asc function, Alexander Graf, 2015/06/04
- [Qemu-devel] [PULL 12/34] target-s390x: fix MMU index computation, Alexander Graf, 2015/06/04