include/asm-mips/param.h

   1 #ifndef _ASM_PARAM_H
   2 #define _ASM_PARAM_H
   3
   4 #ifndef HZ
   5
   6 #ifdef __KERNEL__
   7
   8 /* Safeguard against user stupidity  */
   9 #ifdef _SYS_PARAM_H
  10 #error Do not include <asm/param.h> with __KERNEL__ defined!
  11 #endif
  12
  13 #include <linux/config.h>
  14
  15 #ifdef CONFIG_DECSTATION
  16    /*
  17     * log2(HZ), change this here if you want another HZ value. This is also
  18     * used in dec_time_init.  Minimum is 1, Maximum is 15.
  19     */
  20 #  define LOG_2_HZ 7
  21 #  define HZ (1 << LOG_2_HZ)
  22    /*
  23     * Ye olde division-by-multiplication trick.
  24     * This works only if 100 / HZ <= 1
  25     */
  26 #  define QUOTIENT ((1UL << (32 - LOG_2_HZ)) * 100)
  27 #  define hz_to_std(a)                            \
  28    ({ unsigned int __res;                         \
  29       unsigned long __lo;                         \
  30         __asm__("multu\t%2,%3\n\t"                \
  31                 :"=h" (__res), "=l" (__lo)        \
  32                 :"r" (a),"r" (QUOTIENT));         \
  33         (__typeof__(a)) __res;})
  34
  35 #else /* Not a DECstation  */
  36
  37 /* This is the internal value of HZ, that is the rate at which the jiffies
  38    counter is increasing.  This value is independent from the external value
  39    and can be changed in order to suit the hardware and application
  40    requirements.  */
  41 #  define HZ 100
  42 #  define hz_to_std(a) (a)
  43
  44 #endif /* Not a DECstation */
  45
  46 #else /* defined(__KERNEL__)  */
  47
  48 /* This is the external value of HZ as seen by user programs.  Don't change
  49    unless you know what you're doing - changing breaks binary compatibility.  */
  50 #define HZ 100
  51
  52 #endif /* defined(__KERNEL__)  */
  53 #endif /* defined(HZ)  */
  54
  55 #define EXEC_PAGESIZE   4096
  56
  57 #ifndef NGROUPS
  58 #define NGROUPS         32
  59 #endif
  60
  61 #ifndef NOGROUP
  62 #define NOGROUP         (-1)
  63 #endif
  64
  65 #define MAXHOSTNAMELEN  64      /* max length of hostname */
  66
  67 #endif /* _ASM_PARAM_H */