From ac7d5ef06a6d6e8d84abbd1f0b82162725f98326 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Thu, 11 May 1995 17:39:37 +0000
Subject: Initial revision

---
 c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c | 143 ++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c

(limited to 'c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c')

diff --git a/c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c b/c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c
new file mode 100644
index 0000000000..426b55137b
--- /dev/null
+++ b/c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c
@@ -0,0 +1,143 @@
+/*  ckinit.c
+ *
+ *  This file provides a template for the clock device driver initialization.
+ *
+ *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
+ *  On-Line Applications Research Corporation (OAR).
+ *  All rights assigned to U.S. Government, 1994.
+ *
+ *  This material may be reproduced by or for the U.S. Government pursuant
+ *  to the copyright license under the clause at DFARS 252.227-7013.  This
+ *  notice must appear in all copies of this file and its derivatives.
+ *
+ *  $Id$
+ */
+
+#include <stdlib.h>
+
+#include <rtems.h>
+#include <bsp.h>
+#include <clockdrv.h>
+
+/*
+ *  The interrupt vector number associated with the clock tick device
+ *  driver.
+ */
+
+#define CLOCK_VECTOR    4
+
+/*
+ *  Clock_driver_ticks is a monotonically increasing counter of the
+ *  number of clock ticks since the driver was initialized.
+ */
+volatile rtems_unsigned32 Clock_driver_ticks;
+
+/*
+ *  Clock_isrs is the number of clock ISRs until the next invocation of
+ *  the RTEMS clock tick routine.  The clock tick device driver
+ *  gets an interrupt once a millisecond and counts down until the
+ *  length of time between the user configured microseconds per tick
+ *  has passed.
+ */
+
+rtems_unsigned32 Clock_isrs;              /* ISRs until next tick */
+
+/*
+ *  The previous ISR on this clock tick interrupt vector.
+ */
+
+rtems_isr_entry  Old_ticker;
+
+/*
+ *  Clock_initialize
+ *
+ *  Device driver entry point for clock tick driver initialization.
+ */
+
+rtems_device_driver Clock_initialize(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *pargp,
+  rtems_id tid,
+  rtems_unsigned32 *rval
+)
+{
+  Install_clock( Clock_isr );
+}
+
+/*
+ *  Reinstall_clock
+ *
+ *  Install a clock tick handler without reprogramming the chip.  This
+ *  is used by the polling shared memory device driver.
+ */
+
+void ReInstall_clock(
+  rtems_isr_entry clock_isr
+)
+{
+  rtems_unsigned32 isrlevel = 0;
+
+  /*
+   *  Disable interrupts and install the clock ISR vector using the
+   *  BSP dependent set_vector routine.  In the below example, the clock
+   *  ISR is on vector 4 and is an RTEMS interrupt.
+   */
+
+  rtems_interrupt_disable( isrlevel );
+   (void) set_vector( clock_isr, CLOCK_VECTOR, 1 );
+  rtems_interrupt_enable( isrlevel );
+}
+
+/*
+ *  Install_clock
+ *
+ *  Install a clock tick handler and reprograms the chip.  This
+ *  is used to initially establish the clock tick.
+ */
+
+void Install_clock(
+  rtems_isr_entry clock_isr
+)
+{
+  /*
+   *  Initialize the clock tick device driver variables
+   */
+
+  Clock_driver_ticks = 0;
+  Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
+
+  /*
+   *  If ticks_per_timeslice is configured as non-zero, then the user
+   *  wants a clock tick.
+   */
+
+  if ( BSP_Configuration.ticks_per_timeslice ) {
+    Old_ticker = ( rtems_isr_entry ) set_vector( clock_isr, CLOCK_VECTOR, 1 );
+    /*
+     *  Hardware specific initialize goes here
+     */
+
+    /* XXX */
+  }
+
+  /*
+   *  Schedule the clock cleanup routine to execute if the application exits.
+   */
+
+  atexit( Clock_exit );
+}
+
+/*
+ *  Clean up before the application exits
+ */
+
+void Clock_exit( void )
+{
+  if ( BSP_Configuration.ticks_per_timeslice ) {
+
+    /* XXX: turn off the timer interrupts */
+
+    /* XXX: If necessary, restore the old vector */
+  }
+}
-- 
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