Add _CPU_Counter_frequency()

Add rtems_counter_frequency() API function.  Use it to initialize the
counter value converter via the new system initialization step
(RTEMS_SYSINIT_CPU_COUNTER).  This decouples the counter implementation
and the counter converter.  It avoids an unnecessary pull in of the
64-bit integer division from libgcc.

Update #3456.

1 files changed, 5 insertions, 0 deletions

diff --git a/bsps/arm/lpc176x/start/system-clocks.c b/bsps/arm/lpc176x/start/system-clocks.c
index dd1a0308c6..2ec58727eb 100644
--- a/bsps/arm/lpc176x/start/system-clocks.c
+++ b/bsps/arm/lpc176x/start/system-clocks.c
@@ -109,6 +109,11 @@ unsigned lpc176x_cclk( void )
   return cclk;
 }
 
+uint32_t _CPU_Counter_frequency(void)
+{
+  return LPC176X_PCLK;
+}
+
 CPU_Counter_ticks _CPU_Counter_read( void )
 {
   return lpc176x_get_timer1();