LXR linux-old/include/asm-mips64/param.h

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright 1994 - 2000 Ralf Baechle (ralf@gnu.org)
   7 * Copyright 2000 Silicon Graphics, Inc.
   8 */
   9#ifndef _ASM_PARAM_H
  10#define _ASM_PARAM_H
  11
  12#ifndef HZ
  13
  14#ifdef __KERNEL__
  15
  16/* Safeguard against user stupidity  */
  17#ifdef _SYS_PARAM_H
  18#error Do not include <asm/param.h> with __KERNEL__ defined!
  19#endif
  20
  21#include <linux/config.h>
  22
  23#ifdef CONFIG_DECSTATION
  24   /*
  25    * log2(HZ), change this here if you want another HZ value. This is also
  26    * used in dec_time_init.  Minimum is 1, Maximum is 15.
  27    */
  28#  define LOG_2_HZ 7
  29#  define HZ (1 << LOG_2_HZ)
  30   /*
  31    * Ye olde division-by-multiplication trick.
  32    * This works only if 100 / HZ <= 1
  33    */
  34#  define QUOTIENT ((1UL << (64 - LOG_2_HZ)) * 100)
  35#  define hz_to_std(a)                          \
  36   ({ unsigned long __res;                      \
  37      unsigned long __lo;                       \
  38        __asm__("dmultu\t%2,%3\n\t"             \
  39                :"=h" (__res), "=l" (__lo)      \
  40                :"r" (a), "r" (QUOTIENT));      \
  41        (__typeof__(a)) __res;})
  42
  43#else /* Not a DECstation  */
  44
  45/* This is the internal value of HZ, that is the rate at which the jiffies
  46   counter is increasing.  This value is independent from the external value
  47   and can be changed in order to suit the hardware and application
  48   requirements.  */
  49#  define HZ 100
  50#  define hz_to_std(a) (a)
  51
  52#endif /* Not a DECstation  */
  53
  54#else /* defined(__KERNEL__)  */
  55
  56/* This is the external value of HZ as seen by user programs.  Don't change
  57   unless you know what you're doing - changing breaks binary compatibility.  */
  58#define HZ 100
  59
  60#endif /* defined(__KERNEL__)  */
  61#endif /* defined(HZ)  */
  62
  63#define EXEC_PAGESIZE   65536
  64
  65#ifndef NGROUPS
  66#define NGROUPS         32
  67#endif
  68
  69#ifndef NOGROUP
  70#define NOGROUP         (-1)
  71#endif
  72
  73#define MAXHOSTNAMELEN  64      /* max length of hostname */
  74
  75#ifdef __KERNEL__
  76# define CLOCKS_PER_SEC 100     /* frequency at which times() counts */
  77#endif
  78
  79#endif /* _ASM_PARAM_H */
  80