Changeset 50fc8f6 in rtems

Timestamp:

Jun 13, 2012, 7:44:32 AM (8 years ago)

Author:

Sebastian Huber <sebastian.huber@…>

Branches:

4.11, master

Children:

3246b0f8

Parents:

1364eb99

git-author:

Sebastian Huber <sebastian.huber@…> (06/13/12 07:44:32)

git-committer:

Sebastian Huber <sebastian.huber@…> (06/14/12 12:20:30)

Message:

sapi: Add nanoseconds_per_tick to configuration

Add nanoseconds_per_tick to rtems_configuration_table. This value will
be derived from the microseconds_per_tick value. This avoids some
calculations at run-time.

Files:

• c/src/lib/libbsp/arm/nds/startup/bspstart.c (modified) (1 diff)
• cpukit/sapi/include/confdefs.h (modified) (1 diff)
• cpukit/sapi/include/rtems/config.h (modified) (2 diffs)

c/src/lib/libbsp/arm/nds/startup/bspstart.c

@@ -44 +44 @@
 
   /* configure clock period */
-  Configuration.microseconds_per_tick = 10000;  /* us */
+  rtems_configuration_set_microseconds_per_tick (10000);
 
   defaultExceptionHandler ();

cpukit/sapi/include/confdefs.h

@@ -2324 +2324 @@
     CONFIGURE_MAXIMUM_USER_EXTENSIONS,        /* maximum dynamic extensions */
     CONFIGURE_MICROSECONDS_PER_TICK,          /* microseconds per clock tick */
+    1000 * CONFIGURE_MICROSECONDS_PER_TICK,   /* nanoseconds per clock tick */
     CONFIGURE_TICKS_PER_TIMESLICE,            /* ticks per timeslice quantum */
     CONFIGURE_IDLE_TASK_BODY,                 /* user's IDLE task */

cpukit/sapi/include/rtems/config.h

@@ -147 +147 @@
   uint32_t                       microseconds_per_tick;
 
+  /** This field specifies the number of nanoseconds which elapse
+   *  between clock ticks.  This value is derived from the
+   *  microseconds_per_tick field and provided to avoid calculation at
+   *  run-time.
+   */
+  uint32_t                       nanoseconds_per_tick;
+
   /** This field specifies the number of ticks in each task's timeslice.
    */
@@ -282 +289 @@
         (Configuration.microseconds_per_tick / 1000)
 #define rtems_configuration_get_nanoseconds_per_tick() \
-      (Configuration.microseconds_per_tick * 1000)
+        (Configuration.nanoseconds_per_tick)
+#define rtems_configuration_set_microseconds_per_tick( _us ) \
+        do { \
+          Configuration.microseconds_per_tick = (_us); \
+          Configuration.nanoseconds_per_tick = \
+            1000 * Configuration.microseconds_per_tick; \
+        } while (0)
 
 #define rtems_configuration_get_ticks_per_timeslice() \