LXR linux/arch/tile/include/asm/bitops.h

   1/*
   2 * Copyright 1992, Linus Torvalds.
   3 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   4 *
   5 *   This program is free software; you can redistribute it and/or
   6 *   modify it under the terms of the GNU General Public License
   7 *   as published by the Free Software Foundation, version 2.
   8 *
   9 *   This program is distributed in the hope that it will be useful, but
  10 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  11 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  12 *   NON INFRINGEMENT.  See the GNU General Public License for
  13 *   more details.
  14 */
  15
  16#ifndef _ASM_TILE_BITOPS_H
  17#define _ASM_TILE_BITOPS_H
  18
  19#include <linux/types.h>
  20
  21#ifndef _LINUX_BITOPS_H
  22#error only <linux/bitops.h> can be included directly
  23#endif
  24
  25#ifdef __tilegx__
  26#include <asm/bitops_64.h>
  27#else
  28#include <asm/bitops_32.h>
  29#endif
  30
  31/**
  32 * ffz - find first zero bit in word
  33 * @word: The word to search
  34 *
  35 * Undefined if no zero exists, so code should check against ~0UL first.
  36 */
  37static inline unsigned long ffz(unsigned long word)
  38{
  39        return __builtin_ctzl(~word);
  40}
  41
  42static inline int fls64(__u64 w)
  43{
  44        return (sizeof(__u64) * 8) - __builtin_clzll(w);
  45}
  46
  47/**
  48 * fls - find last set bit in word
  49 * @x: the word to search
  50 *
  51 * This is defined in a similar way as the libc and compiler builtin
  52 * ffs, but returns the position of the most significant set bit.
  53 *
  54 * fls(value) returns 0 if value is 0 or the position of the last
  55 * set bit if value is nonzero. The last (most significant) bit is
  56 * at position 32.
  57 */
  58static inline int fls(int x)
  59{
  60        return fls64((unsigned int) x);
  61}
  62
  63static inline unsigned int __arch_hweight32(unsigned int w)
  64{
  65        return __builtin_popcount(w);
  66}
  67
  68static inline unsigned int __arch_hweight16(unsigned int w)
  69{
  70        return __builtin_popcount(w & 0xffff);
  71}
  72
  73static inline unsigned int __arch_hweight8(unsigned int w)
  74{
  75        return __builtin_popcount(w & 0xff);
  76}
  77
  78static inline unsigned long __arch_hweight64(__u64 w)
  79{
  80        return __builtin_popcountll(w);
  81}
  82
  83#include <asm-generic/bitops/builtin-__ffs.h>
  84#include <asm-generic/bitops/builtin-__fls.h>
  85#include <asm-generic/bitops/builtin-ffs.h>
  86#include <asm-generic/bitops/const_hweight.h>
  87#include <asm-generic/bitops/lock.h>
  88#include <asm-generic/bitops/find.h>
  89#include <asm-generic/bitops/sched.h>
  90#include <asm-generic/bitops/non-atomic.h>
  91#include <asm-generic/bitops/le.h>
  92
  93#endif /* _ASM_TILE_BITOPS_H */
  94