kern: clkdev: Add callback to get elapsed time

Add new clock device callback to get the elapsed time from the timer
being initialized, in microseconds.

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/sys/include/os/clkdev.h b/src/sys/include/os/clkdev.h
index 1f776cd..e70d91b 100644
--- a/src/sys/include/os/clkdev.h
+++ b/src/sys/include/os/clkdev.h
@@ -34,7 +34,8 @@
 #include <sys/param.h>
 
 /* Clock attributes */
-#define CLKDEV_MSLEEP BIT(0)    /* Has msleep() */
+#define CLKDEV_MSLEEP    BIT(0)  /* Has msleep() */
+#define CLKDEV_GET_USEC  BIT(1)  /* Get elapsed usec */
 
 #define MAX_CLKDEV 4
 
@@ -44,11 +45,13 @@
  *
  * @name: Name of clock
  * @msleep: Sleep for 'n' msec
+ * @get_time_usec: Get time since init in microseconds
  * @attr: Attribute mask
  */
 struct clkdev {
     const char *name;
     int(*msleep)(size_t ms);
+    size_t(*get_time_usec)(void);
     uint16_t attr;
 };