release/src-rt-6.x.4708/linux/linux-2.6.36/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  * __ffs - find first set bit in word
  33  * @word: The word to search
  34  *
  35  * Undefined if no set bit exists, so code should check against 0 first.
  36  */
  37 static inline unsigned long __ffs(unsigned long word)
  38 {
  39         return __builtin_ctzl(word);
  40 }
  41
  42 /**
  43  * ffz - find first zero bit in word
  44  * @word: The word to search
  45  *
  46  * Undefined if no zero exists, so code should check against ~0UL first.
  47  */
  48 static inline unsigned long ffz(unsigned long word)
  49 {
  50         return __builtin_ctzl(~word);
  51 }
  52
  53 /**
  54  * __fls - find last set bit in word
  55  * @word: The word to search
  56  *
  57  * Undefined if no set bit exists, so code should check against 0 first.
  58  */
  59 static inline unsigned long __fls(unsigned long word)
  60 {
  61         return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
  62 }
  63
  64 /**
  65  * ffs - find first set bit in word
  66  * @x: the word to search
  67  *
  68  * This is defined the same way as the libc and compiler builtin ffs
  69  * routines, therefore differs in spirit from the other bitops.
  70  *
  71  * ffs(value) returns 0 if value is 0 or the position of the first
  72  * set bit if value is nonzero. The first (least significant) bit
  73  * is at position 1.
  74  */
  75 static inline int ffs(int x)
  76 {
  77         return __builtin_ffs(x);
  78 }
  79
  80 /**
  81  * fls - find last set bit in word
  82  * @x: the word to search
  83  *
  84  * This is defined in a similar way as the libc and compiler builtin
  85  * ffs, but returns the position of the most significant set bit.
  86  *
  87  * fls(value) returns 0 if value is 0 or the position of the last
  88  * set bit if value is nonzero. The last (most significant) bit is
  89  * at position 32.
  90  */
  91 static inline int fls(int x)
  92 {
  93         return (sizeof(int) * 8) - __builtin_clz(x);
  94 }
  95
  96 static inline int fls64(__u64 w)
  97 {
  98         return (sizeof(__u64) * 8) - __builtin_clzll(w);
  99 }
 100
 101 static inline unsigned int __arch_hweight32(unsigned int w)
 102 {
 103         return __builtin_popcount(w);
 104 }
 105
 106 static inline unsigned int __arch_hweight16(unsigned int w)
 107 {
 108         return __builtin_popcount(w & 0xffff);
 109 }
 110
 111 static inline unsigned int __arch_hweight8(unsigned int w)
 112 {
 113         return __builtin_popcount(w & 0xff);
 114 }
 115
 116 static inline unsigned long __arch_hweight64(__u64 w)
 117 {
 118         return __builtin_popcountll(w);
 119 }
 120
 121 #include <asm-generic/bitops/const_hweight.h>
 122 #include <asm-generic/bitops/lock.h>
 123 #include <asm-generic/bitops/sched.h>
 124 #include <asm-generic/bitops/ext2-non-atomic.h>
 125 #include <asm-generic/bitops/minix.h>
 126
 127 #endif /* _ASM_TILE_BITOPS_H */