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-rw-r--r--arch/arm/kernel/time.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index fe31b22..af2afb0 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -110,6 +110,42 @@ void timer_tick(void)
}
#endif
+static void dummy_clock_access(struct timespec *ts)
+{
+ ts->tv_sec = 0;
+ ts->tv_nsec = 0;
+}
+
+static clock_access_fn __read_persistent_clock = dummy_clock_access;
+static clock_access_fn __read_boot_clock = dummy_clock_access;;
+
+void read_persistent_clock(struct timespec *ts)
+{
+ __read_persistent_clock(ts);
+}
+
+void read_boot_clock(struct timespec *ts)
+{
+ __read_boot_clock(ts);
+}
+
+int __init register_persistent_clock(clock_access_fn read_boot,
+ clock_access_fn read_persistent)
+{
+ /* Only allow the clockaccess functions to be registered once */
+ if (__read_persistent_clock == dummy_clock_access &&
+ __read_boot_clock == dummy_clock_access) {
+ if (read_boot)
+ __read_boot_clock = read_boot;
+ if (read_persistent)
+ __read_persistent_clock = read_persistent;
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
static int timer_suspend(void)
{