diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 1999-02-15 02:15:32 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 1999-02-15 02:15:32 +0000 |
| commit | 86464aed71025541805e7b1515541aee89879e33 (patch) | |
| tree | e01a457a4912a8553bc65524aa3125d51f29f810 /include/asm-mips/timex.h | |
| parent | 88f99939ecc6a95a79614574cb7d95ffccfc3466 (diff) | |
Merge with Linux 2.2.1.
Diffstat (limited to 'include/asm-mips/timex.h')
| -rw-r--r-- | include/asm-mips/timex.h | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/include/asm-mips/timex.h b/include/asm-mips/timex.h index dd4aea511..2bec751a4 100644 --- a/include/asm-mips/timex.h +++ b/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 1.1 1998/08/25 09:22:03 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. */ @@ -17,4 +17,23 @@ (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 */ |