-/* Suspends execution for approximately US microseconds.
- Note: this is ridiculously inaccurate. */
-void
-timer_usleep (int64_t us)
+/* Returns MS milliseconds in timer ticks, rounding up. */
+int64_t
+timer_ms2ticks (int64_t ms)
+{
+ /* MS / 1000 s
+ ------------------------ = MS * TIMER_FREQ / 1000 ticks.
+ (1 / TIMER_FREQ) ticks/s
+ */
+ return DIV_ROUND_UP (ms * TIMER_FREQ, 1000);
+}
+
+/* Returns US microseconds in timer ticks, rounding up. */
+int64_t
+timer_us2ticks (int64_t us)
+{
+ return DIV_ROUND_UP (us * TIMER_FREQ, 1000000);
+}
+
+/* Returns NS nanoseconds in timer ticks, rounding up. */
+int64_t
+timer_ns2ticks (int64_t ns)