patch-2.2.11 linux/include/asm-mips/timex.h

• Lines: 38
• Date: Mon Aug 9 12:04:41 1999
• Orig file: v2.2.10/linux/include/asm-mips/timex.h
• Orig date: Tue Oct 20 13:52:54 1998

diff -u --recursive --new-file v2.2.10/linux/include/asm-mips/timex.h linux/include/asm-mips/timex.h
@@ -1,10 +1,10 @@
-/* $Id: timex.h,v 1.1 1998/08/17 10:20:18 ralf Exp $
+/* $Id: timex.h,v 1.2 1999/02/15 02:22:14 ralf Exp $
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 1998 by Ralf Baechle
+ * Copyright (C) 1998, 1999 by Ralf Baechle
  *
  * FIXME: For some of the supported machines this is dead wrong.
  */
@@ -16,5 +16,24 @@
 #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
 	(1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
 		<< (SHIFT_SCALE-SHIFT_HZ)) / HZ)
+
+/*
+ * Standard way to access the cycle counter.
+ * Currently only used on SMP for scheduling.
+ *
+ * Only the low 32 bits are available as a continuously counting entity. 
+ * But this only means we'll force a reschedule every 8 seconds or so,
+ * which isn't an evil thing.
+ *
+ * We know that all SMP capable CPUs have cycle counters.
+ */
+
+typedef unsigned int cycles_t;
+extern cycles_t cacheflush_time;
+
+static inline cycles_t get_cycles (void)
+{
+	return read_32bit_cp0_register(CP0_COUNT);
+}
 
 #endif /*  __ASM_MIPS_TIMEX_H */