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

   1/*
   2 * Copyright 2004-2009 Analog Devices Inc.
   3 *
   4 * Licensed under the GPL-2 or later.
   5 */
   6
   7#ifndef _BLACKFIN_BITOPS_H
   8#define _BLACKFIN_BITOPS_H
   9
  10#include <linux/compiler.h>
  11
  12#include <asm-generic/bitops/__ffs.h>
  13#include <asm-generic/bitops/ffz.h>
  14#include <asm-generic/bitops/fls.h>
  15#include <asm-generic/bitops/__fls.h>
  16#include <asm-generic/bitops/fls64.h>
  17#include <asm-generic/bitops/find.h>
  18
  19#ifndef _LINUX_BITOPS_H
  20#error only <linux/bitops.h> can be included directly
  21#endif
  22
  23#include <asm-generic/bitops/sched.h>
  24#include <asm-generic/bitops/ffs.h>
  25#include <asm-generic/bitops/const_hweight.h>
  26#include <asm-generic/bitops/lock.h>
  27
  28#include <asm-generic/bitops/ext2-non-atomic.h>
  29#include <asm-generic/bitops/ext2-atomic.h>
  30#include <asm-generic/bitops/minix.h>
  31
  32#ifndef CONFIG_SMP
  33#include <linux/irqflags.h>
  34
  35/*
  36 * clear_bit may not imply a memory barrier
  37 */
  38#ifndef smp_mb__before_clear_bit
  39#define smp_mb__before_clear_bit()      smp_mb()
  40#define smp_mb__after_clear_bit()       smp_mb()
  41#endif
  42#include <asm-generic/bitops/atomic.h>
  43#include <asm-generic/bitops/non-atomic.h>
  44#else
  45
  46#include <asm/byteorder.h>      /* swab32 */
  47#include <linux/linkage.h>
  48
  49asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr);
  50
  51asmlinkage int __raw_bit_clear_asm(volatile unsigned long *addr, int nr);
  52
  53asmlinkage int __raw_bit_toggle_asm(volatile unsigned long *addr, int nr);
  54
  55asmlinkage int __raw_bit_test_set_asm(volatile unsigned long *addr, int nr);
  56
  57asmlinkage int __raw_bit_test_clear_asm(volatile unsigned long *addr, int nr);
  58
  59asmlinkage int __raw_bit_test_toggle_asm(volatile unsigned long *addr, int nr);
  60
  61asmlinkage int __raw_bit_test_asm(const volatile unsigned long *addr, int nr);
  62
  63static inline void set_bit(int nr, volatile unsigned long *addr)
  64{
  65        volatile unsigned long *a = addr + (nr >> 5);
  66        __raw_bit_set_asm(a, nr & 0x1f);
  67}
  68
  69static inline void clear_bit(int nr, volatile unsigned long *addr)
  70{
  71        volatile unsigned long *a = addr + (nr >> 5);
  72        __raw_bit_clear_asm(a, nr & 0x1f);
  73}
  74
  75static inline void change_bit(int nr, volatile unsigned long *addr)
  76{
  77        volatile unsigned long *a = addr + (nr >> 5);
  78        __raw_bit_toggle_asm(a, nr & 0x1f);
  79}
  80
  81static inline int test_bit(int nr, const volatile unsigned long *addr)
  82{
  83        volatile const unsigned long *a = addr + (nr >> 5);
  84        return __raw_bit_test_asm(a, nr & 0x1f) != 0;
  85}
  86
  87static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
  88{
  89        volatile unsigned long *a = addr + (nr >> 5);
  90        return __raw_bit_test_set_asm(a, nr & 0x1f);
  91}
  92
  93static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
  94{
  95        volatile unsigned long *a = addr + (nr >> 5);
  96        return __raw_bit_test_clear_asm(a, nr & 0x1f);
  97}
  98
  99static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
 100{
 101        volatile unsigned long *a = addr + (nr >> 5);
 102        return __raw_bit_test_toggle_asm(a, nr & 0x1f);
 103}
 104
 105/*
 106 * clear_bit() doesn't provide any barrier for the compiler.
 107 */
 108#define smp_mb__before_clear_bit()      barrier()
 109#define smp_mb__after_clear_bit()       barrier()
 110
 111#define test_bit __skip_test_bit
 112#include <asm-generic/bitops/non-atomic.h>
 113#undef test_bit
 114
 115#endif /* CONFIG_SMP */
 116
 117/*
 118 * hweightN: returns the hamming weight (i.e. the number
 119 * of bits set) of a N-bit word
 120 */
 121
 122static inline unsigned int __arch_hweight32(unsigned int w)
 123{
 124        unsigned int res;
 125
 126        __asm__ ("%0.l = ONES %1;"
 127                "%0 = %0.l (Z);"
 128                : "=d" (res) : "d" (w));
 129        return res;
 130}
 131
 132static inline unsigned int __arch_hweight64(__u64 w)
 133{
 134        return __arch_hweight32((unsigned int)(w >> 32)) +
 135               __arch_hweight32((unsigned int)w);
 136}
 137
 138static inline unsigned int __arch_hweight16(unsigned int w)
 139{
 140        return __arch_hweight32(w & 0xffff);
 141}
 142
 143static inline unsigned int __arch_hweight8(unsigned int w)
 144{
 145        return __arch_hweight32(w & 0xff);
 146}
 147
 148#endif                          /* _BLACKFIN_BITOPS_H */
 149