1 /* SPDX-License-Identifier: GPL-2.0 */ !! 1 #ifndef _ASM_PARAM_H
2 #ifndef __ASM_GENERIC_PARAM_H !! 2 #define _ASM_PARAM_H
3 #define __ASM_GENERIC_PARAM_H !! 3
4 !! 4 #ifndef HZ
5 #include <uapi/asm-generic/param.h> !! 5
6 !! 6 #ifdef __KERNEL__
7 # undef HZ !! 7
8 # define HZ CONFIG_HZ /* Int !! 8 /* Safeguard against user stupidity */
9 # define USER_HZ 100 /* som !! 9 #ifdef _SYS_PARAM_H
10 # define CLOCKS_PER_SEC (USER_HZ) /* in !! 10 #error Do not include <asm/param.h> with __KERNEL__ defined!
11 #endif /* __ASM_GENERIC_PARAM_H */ !! 11 #endif
>> 12
>> 13 #include <linux/config.h>
>> 14
>> 15 #include <asm/compiler.h>
>> 16
>> 17 #ifdef CONFIG_DECSTATION
>> 18 /*
>> 19 * log2(HZ), change this here if you want another HZ value. This is also
>> 20 * used in dec_time_init. Minimum is 1, Maximum is 15.
>> 21 */
>> 22 # define LOG_2_HZ 7
>> 23 # define HZ (1 << LOG_2_HZ)
>> 24 /*
>> 25 * Ye olde division-by-multiplication trick.
>> 26 * This works only if 100 / HZ <= 1
>> 27 */
>> 28 # define QUOTIENT ((1UL << (32 - LOG_2_HZ)) * 100)
>> 29 # define hz_to_std(a) \
>> 30 ({ unsigned long __res; \
>> 31 unsigned long __lo; \
>> 32 __asm__("multu\t%2,%3\n\t" \
>> 33 : "=h" (__res), "=l" (__lo) \
>> 34 : "r" (a), "r" (QUOTIENT) \
>> 35 : GCC_REG_ACCUM); \
>> 36 (__typeof__(a)) __res;})
>> 37
>> 38 #else /* Not a DECstation */
>> 39
>> 40 /* This is the internal value of HZ, that is the rate at which the jiffies
>> 41 counter is increasing. This value is independent from the external value
>> 42 and can be changed in order to suit the hardware and application
>> 43 requirements. */
>> 44 # define HZ 100
>> 45 # define hz_to_std(a) (a)
>> 46
>> 47 #endif /* Not a DECstation */
>> 48
>> 49 #else /* defined(__KERNEL__) */
>> 50
>> 51 /* This is the external value of HZ as seen by user programs. Don't change
>> 52 unless you know what you're doing - changing breaks binary compatibility. */
>> 53 #define HZ 100
>> 54
>> 55 #endif /* defined(__KERNEL__) */
>> 56 #endif /* defined(HZ) */
>> 57
>> 58 #define EXEC_PAGESIZE 65536
>> 59
>> 60 #ifndef NGROUPS
>> 61 #define NGROUPS 32
>> 62 #endif
>> 63
>> 64 #ifndef NOGROUP
>> 65 #define NOGROUP (-1)
>> 66 #endif
>> 67
>> 68 #define MAXHOSTNAMELEN 64 /* max length of hostname */
>> 69
>> 70 #ifdef __KERNEL__
>> 71 # define CLOCKS_PER_SEC 100 /* frequency at which times() counts */
>> 72 #endif
>> 73
>> 74 #endif /* _ASM_PARAM_H */
12 75
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