[Minios-devel] [UNIKRAFT PATCH v3 7/8] plat/linuxu: Add monotonic clock

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Implement ukplat_monotonic_clock() with clock_gettime()
system call.

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 plat/linuxu/include/linuxu/syscall-arm_32.h |  2 ++
 plat/linuxu/include/linuxu/syscall-x86_64.h |  2 ++
 plat/linuxu/include/linuxu/syscall.h        |  8 ++++++++
 plat/linuxu/include/linuxu/time.h           |  1 +
 plat/linuxu/time.c                          | 15 +++++++++++++--
 5 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/plat/linuxu/include/linuxu/syscall-arm_32.h 
b/plat/linuxu/include/linuxu/syscall-arm_32.h
index 2f0980a..3cdd32b 100644
--- a/plat/linuxu/include/linuxu/syscall-arm_32.h
+++ b/plat/linuxu/include/linuxu/syscall-arm_32.h
@@ -47,6 +47,8 @@
 #define __SC_EXIT       1
 #define __SC_IOCTL     54
 
+#define __SC_CLOCK_GETTIME 263
+
 #define __SC_RT_SIGACTION 43
 #define __SC_RT_SIGPROCMASK 126
 
diff --git a/plat/linuxu/include/linuxu/syscall-x86_64.h 
b/plat/linuxu/include/linuxu/syscall-x86_64.h
index e58f260..5406ddf 100644
--- a/plat/linuxu/include/linuxu/syscall-x86_64.h
+++ b/plat/linuxu/include/linuxu/syscall-x86_64.h
@@ -47,6 +47,8 @@
 #define __SC_IOCTL  16
 #define __SC_EXIT   60
 
+#define __SC_CLOCK_GETTIME 228
+
 #define __SC_RT_SIGACTION 13
 #define __SC_RT_SIGPROCMASK 14
 
diff --git a/plat/linuxu/include/linuxu/syscall.h 
b/plat/linuxu/include/linuxu/syscall.h
index 8411f39..577c0bd 100644
--- a/plat/linuxu/include/linuxu/syscall.h
+++ b/plat/linuxu/include/linuxu/syscall.h
@@ -37,6 +37,7 @@
 #define __SYSCALL_H__
 
 #include <sys/types.h>
+#include <sys/time.h>
 #include <linuxu/signal.h>
 
 #if defined __X86_64__
@@ -69,6 +70,13 @@ static inline int sys_exit(int status)
                              (long) (status));
 }
 
+static inline int sys_clock_gettime(clockid_t clk_id, struct timespec *tp)
+{
+       return (int) syscall2(__SC_CLOCK_GETTIME,
+                             (long) clk_id,
+                             (long) tp);
+}
+
 /*
  * Please note that on failure sys_mmap() is returning -errno
  */
diff --git a/plat/linuxu/include/linuxu/time.h 
b/plat/linuxu/include/linuxu/time.h
index c4c97e1..94bf91b 100644
--- a/plat/linuxu/include/linuxu/time.h
+++ b/plat/linuxu/include/linuxu/time.h
@@ -41,5 +41,6 @@
 /* POSIX definitions */
 
 #define CLOCK_REALTIME       0
+#define CLOCK_MONOTONIC      1
 
 #endif /* __LINUXU_TIME_H__ */
diff --git a/plat/linuxu/time.c b/plat/linuxu/time.c
index b79a821..c9ff452 100644
--- a/plat/linuxu/time.c
+++ b/plat/linuxu/time.c
@@ -39,6 +39,7 @@
 #include <uk/assert.h>
 #include <linuxu/syscall.h>
 #include <linuxu/time.h>
+#include <sys/time.h>
 
 #define TIMER_INTVAL_NSEC    ukarch_time_msec_to_nsec(TIMER_INTVAL_MSEC)
 
@@ -47,8 +48,18 @@ static timer_t timerid;
 
 __nsec ukplat_monotonic_clock(void)
 {
-       /* TODO */
-       return 0;
+       struct timespec tp;
+       __nsec ret;
+       int rc;
+
+       rc = sys_clock_gettime(CLOCK_MONOTONIC, &tp);
+       if (unlikely(rc != 0))
+               return 0;
+
+       ret = ukarch_time_sec_to_nsec((__nsec) tp.tv_sec);
+       ret += (__nsec) tp.tv_nsec;
+
+       return ret;
 }
 
 static int timer_handler(void *arg __unused)
-- 
2.7.4


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