From 89611889fe6e255dec90a5157a4f25c0f65057b4 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Tue, 14 Apr 1998 19:49:13 +0000
Subject: new files

---
 c/src/lib/libbsp/powerpc/psim/timer/Makefile.in |  59 +++++++++++++
 c/src/lib/libbsp/powerpc/psim/timer/timer.c     | 105 ++++++++++++++++++++++++
 2 files changed, 164 insertions(+)
 create mode 100644 c/src/lib/libbsp/powerpc/psim/timer/Makefile.in
 create mode 100644 c/src/lib/libbsp/powerpc/psim/timer/timer.c

(limited to 'c/src/lib/libbsp/powerpc/psim/timer')

diff --git a/c/src/lib/libbsp/powerpc/psim/timer/Makefile.in b/c/src/lib/libbsp/powerpc/psim/timer/Makefile.in
new file mode 100644
index 0000000000..16665e4de9
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/psim/timer/Makefile.in
@@ -0,0 +1,59 @@
+#
+#  $Id$
+#
+
+@SET_MAKE@
+srcdir = @srcdir@
+VPATH = @srcdir@
+RTEMS_ROOT = @top_srcdir@
+PROJECT_ROOT = @PROJECT_ROOT@
+
+PGM=${ARCH}/timer.rel
+
+# C source names, if any, go here -- minus the .c
+C_PIECES=timer
+C_FILES=$(C_PIECES:%=%.c)
+C_O_FILES=$(C_PIECES:%=${ARCH}/%.o)
+
+H_FILES=
+
+# Assembly source names, if any, go here -- minus the .s
+S_PIECES=
+S_FILES=$(S_PIECES:%=%.s)
+S_O_FILES=$(S_FILES:%.s=${ARCH}/%.o)
+
+SRCS=$(C_FILES) $(CC_FILES) $(H_FILES) $(S_FILES)
+OBJS=$(C_O_FILES) $(CC_O_FILES) $(S_O_FILES)
+
+include $(RTEMS_ROOT)/make/custom/$(RTEMS_BSP).cfg
+include $(RTEMS_ROOT)/make/leaf.cfg
+
+#
+# (OPTIONAL) Add local stuff here using +=
+#
+
+DEFINES  +=
+CPPFLAGS +=
+CFLAGS   +=
+
+LD_PATHS  +=
+LD_LIBS   +=
+LDFLAGS   +=
+
+#
+# Add your list of files to delete here.  The config files
+#  already know how to delete some stuff, so you may want
+#  to just run 'make clean' first to see what gets missed.
+#  'make clobber' already includes 'make clean'
+#
+
+CLEAN_ADDITIONS +=
+CLOBBER_ADDITIONS +=
+
+${PGM}: ${SRCS} ${OBJS}
+	$(make-rel)
+
+all:	${ARCH} $(SRCS) $(PGM)
+
+# the .rel file built here will be put into libbsp.a by ../wrapup/Makefile
+install:  all
diff --git a/c/src/lib/libbsp/powerpc/psim/timer/timer.c b/c/src/lib/libbsp/powerpc/psim/timer/timer.c
new file mode 100644
index 0000000000..43c71103c1
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/psim/timer/timer.c
@@ -0,0 +1,105 @@
+/*  timer.c
+ *
+ *  This file implements a benchmark timer using the General Purpose Timer on
+ *  the MEC.
+ *
+ *  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.
+ *
+ *  Ported to ERC32 implementation of the SPARC by On-Line Applications
+ *  Research Corporation (OAR) under contract to the European Space 
+ *  Agency (ESA).
+ *
+ *  ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995. 
+ *  European Space Agency.
+ *
+ *  $Id$
+ */
+
+#include <assert.h>
+
+#include <bsp.h>
+
+rtems_unsigned64 Timer_driver_Start_time;
+
+rtems_boolean Timer_driver_Find_average_overhead;
+
+static inline rtems_unsigned64 PPC_Get_timebase_register( void )
+{
+  rtems_unsigned32 tbr_low;
+  rtems_unsigned32 tbr_high;
+  rtems_unsigned32 tbr_high_old;
+  rtems_unsigned64 tbr;
+
+  do {
+    asm volatile( "mftbu %0" : "=r" (tbr_high_old));
+    asm volatile( "mftb  %0" : "=r" (tbr_low));
+    asm volatile( "mftbu %0" : "=r" (tbr_high));
+  } while ( tbr_high_old != tbr_high );
+
+  tbr = tbr_high;
+  tbr <<= 32;
+  tbr |= tbr_low;
+  return tbr;
+}
+
+void Timer_initialize()
+{
+  /*
+   *  Timer runs long and accurate enough not to require an interrupt.
+   */
+
+
+  Timer_driver_Start_time = PPC_Get_timebase_register();
+  
+
+}
+
+#define AVG_OVERHEAD     24  /* It typically takes 24 instructions */
+                             /*     to start/stop the timer. */
+#define LEAST_VALID       1  /* Don't trust a value lower than this */
+                             /* psim can count instructions. :) */
+
+int Read_timer()
+{
+  rtems_unsigned64  clicks;
+  rtems_unsigned64  total64;
+  rtems_unsigned32  total;
+
+  /* approximately CLOCK_SPEED clicks per microsecond */
+
+  clicks = PPC_Get_timebase_register();
+
+  assert( clicks > Timer_driver_Start_time );
+
+  total64 = clicks - Timer_driver_Start_time;
+
+  assert( total64 <= 0xffffffff );  /* fits into a unsigned32 */
+
+  total = (rtems_unsigned32) total64;
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in one microsecond units */
+
+  if ( total < LEAST_VALID )
+    return 0;            /* below timer resolution */
+
+  return total - AVG_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;
+}
-- 
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