Upcoming changes will make use of the CPU timer, so add a convenience
function to set the CPU timer.
Since shifts for both CPU timer and TOD clock are the same, introduce a
new define TIMING_S390_SHIFT_US. The respective shifts for CPU timer and
TOD clock reference it, so the semantic difference between the two
defines is kept.
Signed-off-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
---
lib/s390x/asm/time.h | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/lib/s390x/asm/time.h b/lib/s390x/asm/time.h
index 7652a151e87a..9ae364afb8a3 100644
--- a/lib/s390x/asm/time.h
+++ b/lib/s390x/asm/time.h
@@ -11,9 +11,13 @@
#ifndef _ASMS390X_TIME_H_
#define _ASMS390X_TIME_H_
-#define STCK_SHIFT_US (63 - 51)
+#define TIMING_S390_SHIFT_US (63 - 51)
+
+#define STCK_SHIFT_US TIMING_S390_SHIFT_US
#define STCK_MAX ((1UL << 52) - 1)
+#define CPU_TIMER_SHIFT_US TIMING_S390_SHIFT_US
+
static inline uint64_t get_clock_us(void)
{
uint64_t clk;
@@ -45,4 +49,14 @@ static inline void mdelay(unsigned long ms)
udelay(ms * 1000);
}
+static inline void cpu_timer_set(int64_t timeout_ms)
+{
+ int64_t timer_value = (timeout_ms * 1000) << CPU_TIMER_SHIFT_US;
+ asm volatile (
+ "spt %[timer_value]\n"
+ :
+ : [timer_value] "Q" (timer_value)
+ );
+}
+
#endif
--
2.36.1
