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root/bsp/hal/ppc/arch/clock.c

DEFINITIONS

1. clock_isr
2. clock_init

   1 /*-
   2  * Copyright (c) 2009, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 /*
  31  * clock.c - clock driver for Power PC decrementer.
  32  */
  34 #include <sys/ipl.h>
  35 #include <kernel.h>
  36 #include <timer.h>
  37 #include <irq.h>
  38 #include <cpufunc.h>
  39 #include <sys/ipl.h>
  41 #define DECR_COUNT      1000
  43 /*
  44  * Timer handler.
  45  */
  46 int
clock_isr(void *arg)
  48 {
  49         int s;
  51         /* Reset decrementer */
set_decr(DECR_COUNT);
s = splhigh();
timer_handler();
splx(s);
  58         return INT_DONE;
  59 }
  61 /*
  62  * Initialize clock H/W.
  63  */
  64 void
clock_init(void)
  66 {
DPRINTF(("clock_init\n"));
set_decr(DECR_COUNT);
  70 }