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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-25 13:38:36 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-25 13:38:55 +0100
commitb020632e40c3ed5e8c0c066d022672907e8401cf (patch)
treed7f805bd27e8378436fbba7e7457afbd10c22ed8 /arch/s390/kernel/time.c
parentfc5243d98ac2575ad14a974b3c097e9ba874c03d (diff)
[S390] introduce vdso on s390
Add a vdso to speed up gettimeofday and clock_getres/clock_gettime for CLOCK_REALTIME/CLOCK_MONOTONIC. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/time.c')
-rw-r--r--arch/s390/kernel/time.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index eccefbbff88..b73bbf31f43 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -36,6 +36,7 @@
#include <asm/delay.h>
#include <asm/s390_ext.h>
#include <asm/div64.h>
+#include <asm/vdso.h>
#include <asm/irq.h>
#include <asm/irq_regs.h>
#include <asm/timer.h>
@@ -223,6 +224,36 @@ static struct clocksource clocksource_tod = {
};
+void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
+{
+ if (clock != &clocksource_tod)
+ return;
+
+ /* Make userspace gettimeofday spin until we're done. */
+ ++vdso_data->tb_update_count;
+ smp_wmb();
+ vdso_data->xtime_tod_stamp = clock->cycle_last;
+ vdso_data->xtime_clock_sec = xtime.tv_sec;
+ vdso_data->xtime_clock_nsec = xtime.tv_nsec;
+ vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
+ vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
+ smp_wmb();
+ ++vdso_data->tb_update_count;
+}
+
+extern struct timezone sys_tz;
+
+void update_vsyscall_tz(void)
+{
+ /* Make userspace gettimeofday spin until we're done. */
+ ++vdso_data->tb_update_count;
+ smp_wmb();
+ vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
+ vdso_data->tz_dsttime = sys_tz.tz_dsttime;
+ smp_wmb();
+ ++vdso_data->tb_update_count;
+}
+
/*
* Initialize the TOD clock and the CPU timer of
* the boot cpu.