MPC821 support and PPC patches from Andrew Bray <andy@madhouse.demon.co.uk>:

  In c/src/exec/score/cpu/powerpc/rtems/score/ppc.h:

    A lot of hardware interrupts were omitted.  Patch enclosed.
    I have also added the 821.

  In c/src/exec/score/cpu/powerpc/rtems/score/cpu.h:

    My patch adds the 821.

  In c/src/exec/score/cpu/powerpc/cpu.c:

    I have added the MPC821, and also fixed up for the missing hardware
    interrupts.  It is also inconsistent with
    c/src/lib/libcpu/powerpc/mpc860/vectors/vectors.S.  This has been fixed.


  In c/src/lib/libcpu/powerpc/mpc860/vectors/vectors.S:

    Fixed an inconsistency with cpu.c.

    I also include some new files to go with the above patches.  These are the
    cpu library rtems-19990331/c/src/lib/libcpu/powerpc/mpc821/* and
    c/src/exec/score/cpu/powerpc/mpc821.h which are minor modifications of
    the 860 equivalents.

  Other comments:

    The various accesses to the DPRAM on the 860 are done with a linktime
    symbol. This could be done dynamically at run time by reading the immr
    register, and masking off the lower 16 bits.  This takes the same amount
    of time as loading an address constant, and the same number of
    instructions as well (2).

    In c/src/lib/libcpu/powerpc/mpc860/console-generic/console-generic.c:

      This will silently fail if you attempt to use SCC1.  This is only relevant
      if you are not using SCC1 for ethernet.

      This file also sets one of port B output pins for each port.  This is NOT
      generic, it should be in the BSP specific console driver.

1 files changed, 104 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/powerpc/mpc821/timer/timer.c b/c/src/lib/libcpu/powerpc/mpc821/timer/timer.c
new file mode 100644
index 0000000000..0700fea807
--- /dev/null
+++ b/c/src/lib/libcpu/powerpc/mpc821/timer/timer.c
@@ -0,0 +1,104 @@
+/*  timer.c
+ *
+ *  This file manages the interval timer on the PowerPC MPC821.
+ *  NOTE: This is not the PIT, but rather the RTEMS interval
+ *        timer
+ *  We shall use the bottom 32 bits of the timebase register,
+ *
+ *  The following was in the 403 version of this file. I don't
+ *  know what it means. JTM 5/19/98
+ *  NOTE: It is important that the timer start/stop overhead be
+ *        determined when porting or modifying this code.
+ *
+ *  Author: Jay Monkman (jmonkman@frasca.com)
+ *  Copywright (C) 1998 by Frasca International, Inc.
+ *
+ *  Derived from c/src/lib/libcpu/ppc/ppc403/timer/timer.c:
+ *
+ *  Author:     Andrew Bray <andy@i-cubed.co.uk>
+ *
+ *  COPYRIGHT (c) 1995 by i-cubed ltd.
+ *
+ *  To anyone who acknowledges that this file is provided "AS IS"
+ *  without any express or implied warranty:
+ *      permission to use, copy, modify, and distribute this file
+ *      for any purpose is hereby granted without fee, provided that
+ *      the above copyright notice and this notice appears in all
+ *      copies, and that the name of i-cubed limited not be used in
+ *      advertising or publicity pertaining to distribution of the
+ *      software without specific, written prior permission.
+ *      i-cubed limited makes no representations about the suitability
+ *      of this software for any purpose.
+ *
+ *  Derived from c/src/lib/libcpu/hppa1_1/timer/timer.c:
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <bsp.h>
+#include <rtems.h>
+#include <mpc821.h>
+
+extern rtems_cpu_table           Cpu_table;             /* owned by BSP */
+
+static volatile rtems_unsigned32 Timer_starting;
+static rtems_boolean Timer_driver_Find_average_overhead;
+
+/*
+ *  This is so small that this code will be reproduced where needed.
+ */
+static inline rtems_unsigned32 get_itimer(void)
+{
+   rtems_unsigned32 ret;
+
+   asm volatile ("mftb %0" : "=r" ((ret))); /* TBLO */
+
+   return ret;
+}
+
+void Timer_initialize(void)
+{
+  /* set interrupt level and enable timebase. This should never */
+  /*  generate an interrupt however. */
+  m821.tbscr |= M821_TBSCR_TBIRQ(4) | M821_TBSCR_TBE;
+  
+  Timer_starting = get_itimer();
+}
+
+int Read_timer(void)
+{
+  rtems_unsigned32 clicks;
+  rtems_unsigned32 total;
+
+  clicks = get_itimer();
+
+  total = clicks - Timer_starting;
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in XXX microsecond units */
+
+  else {
+    if ( total < Cpu_table.timer_least_valid ) {
+      return 0;            /* below timer resolution */
+    }
+    return (total - Cpu_table.timer_average_overhead);
+  }
+}
+
+rtems_status_code Empty_function(void)
+{
+  return RTEMS_SUCCESSFUL;
+}
+
+void Set_find_average_overhead(rtems_boolean find_flag)
+{
+  Timer_driver_Find_average_overhead = find_flag;
+}