2 files changed, 56 insertions, 0 deletions

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index d089d052c4a9..495440779ce3 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -242,6 +242,25 @@ static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp)
         return 0;
 }
 
+
+static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp)
+{
+        *tp = current_kernel_time();
+        return 0;
+}
+
+static int posix_get_monotonic_coarse(clockid_t which_clock,
+                                                struct timespec *tp)
+{
+        *tp = get_monotonic_coarse();
+        return 0;
+}
+
+int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp)
+{
+        *tp = ktime_to_timespec(KTIME_LOW_RES);
+        return 0;
+}
 /*
  * Initialize everything, well, just everything in Posix clocks/timers ;)
  */
@@ -262,10 +281,26 @@ static __init int init_posix_timers(void)
                 .timer_create = no_timer_create,
                 .nsleep = no_nsleep,
         };
+        struct k_clock clock_realtime_coarse = {
+                .clock_getres = posix_get_coarse_res,
+                .clock_get = posix_get_realtime_coarse,
+                .clock_set = do_posix_clock_nosettime,
+                .timer_create = no_timer_create,
+                .nsleep = no_nsleep,
+        };
+        struct k_clock clock_monotonic_coarse = {
+                .clock_getres = posix_get_coarse_res,
+                .clock_get = posix_get_monotonic_coarse,
+                .clock_set = do_posix_clock_nosettime,
+                .timer_create = no_timer_create,
+                .nsleep = no_nsleep,
+        };
 
         register_posix_clock(CLOCK_REALTIME, &clock_realtime);
         register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
         register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw);
+        register_posix_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse);
+        register_posix_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse);
 
         posix_timers_cache = kmem_cache_create("posix_timers_cache",
                                         sizeof (struct k_itimer), 0, SLAB_PANIC,
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 15e06defca55..03cbeb34d141 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -847,6 +847,10 @@ unsigned long get_seconds(void)
 }
 EXPORT_SYMBOL(get_seconds);
 
+struct timespec __current_kernel_time(void)
+{
+        return xtime_cache;
+}
 
 struct timespec current_kernel_time(void)
 {
@@ -862,3 +866,20 @@ struct timespec current_kernel_time(void)
         return now;
 }
 EXPORT_SYMBOL(current_kernel_time);
+
+struct timespec get_monotonic_coarse(void)
+{
+        struct timespec now, mono;
+        unsigned long seq;
+
+        do {
+                seq = read_seqbegin(&xtime_lock);
+
+                now = xtime_cache;
+                mono = wall_to_monotonic;
+        } while (read_seqretry(&xtime_lock, seq));
+
+        set_normalized_timespec(&now, now.tv_sec + mono.tv_sec,
+                                now.tv_nsec + mono.tv_nsec);
+        return now;
+}