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-atomic.h>
  29
  30#ifndef CONFIG_SMP
  31#include <linux/irqflags.h>
  32
  33/*
  34 * clear_bit may not imply a memory barrier
  35 */
  36#ifndef smp_mb__before_clear_bit
  37#define smp_mb__before_clear_bit()      smp_mb()
  38#define smp_mb__after_clear_bit()       smp_mb()
  39#endif
  40#include <asm-generic/bitops/atomic.h>
  41#include <asm-generic/bitops/non-atomic.h>
  42#else
  43
  44#include <asm/byteorder.h>      /* swab32 */
  45#include <linux/linkage.h>
  46
  47asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr);
  48
  49asmlinkage int __raw_bit_clear_asm(volatile unsigned long *addr, int nr);
  50
  51asmlinkage int __raw_bit_toggle_asm(volatile unsigned long *addr, int nr);
  52
  53asmlinkage int __raw_bit_test_set_asm(volatile unsigned long *addr, int nr);
  54
  55asmlinkage int __raw_bit_test_clear_asm(volatile unsigned long *addr, int nr);
  56
  57asmlinkage int __raw_bit_test_toggle_asm(volatile unsigned long *addr, int nr);
  58
  59asmlinkage int __raw_bit_test_asm(const volatile unsigned long *addr, int nr);
  60
  61static inline void set_bit(int nr, volatile unsigned long *addr)
  62{
  63        volatile unsigned long *a = addr + (nr >> 5);
  64        __raw_bit_set_asm(a, nr & 0x1f);
  65}
  66
  67static inline void clear_bit(int nr, volatile unsigned long *addr)
  68{
  69        volatile unsigned long *a = addr + (nr >> 5);
  70        __raw_bit_clear_asm(a, nr & 0x1f);
  71}
  72
  73static inline void change_bit(int nr, volatile unsigned long *addr)
  74{
  75        volatile unsigned long *a = addr + (nr >> 5);
  76        __raw_bit_toggle_asm(a, nr & 0x1f);
  77}
  78
  79static inline int test_bit(int nr, const volatile unsigned long *addr)
  80{
  81        volatile const unsigned long *a = addr + (nr >> 5);
  82        return __raw_bit_test_asm(a, nr & 0x1f) != 0;
  83}
  84
  85static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
  86{
  87        volatile unsigned long *a = addr + (nr >> 5);
  88        return __raw_bit_test_set_asm(a, nr & 0x1f);
  89}
  90
  91static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
  92{
  93        volatile unsigned long *a = addr + (nr >> 5);
  94        return __raw_bit_test_clear_asm(a, nr & 0x1f);
  95}
  96
  97static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
  98{
  99        volatile unsigned long *a = addr + (nr >> 5);
 100        return __raw_bit_test_toggle_asm(a, nr & 0x1f);
 101}
 102
 103/*
 104 * clear_bit() doesn't provide any barrier for the compiler.
 105 */
 106#define smp_mb__before_clear_bit()      barrier()
 107#define smp_mb__after_clear_bit()       barrier()
 108
 109#define test_bit __skip_test_bit
 110#include <asm-generic/bitops/non-atomic.h>
 111#undef test_bit
 112
 113#endif /* CONFIG_SMP */
 114
 115/* Needs to be after test_bit and friends */
 116#include <asm-generic/bitops/le.h>
 117
 118/*
 119 * hweightN: returns the hamming weight (i.e. the number
 120 * of bits set) of a N-bit word
 121 */
 122
 123static inline unsigned int __arch_hweight32(unsigned int w)
 124{
 125        unsigned int res;
 126
 127        __asm__ ("%0.l = ONES %1;"
 128                "%0 = %0.l (Z);"
 129                : "=d" (res) : "d" (w));
 130        return res;
 131}
 132
 133static inline unsigned int __arch_hweight64(__u64 w)
 134{
 135        return __arch_hweight32((unsigned int)(w >> 32)) +
 136               __arch_hweight32((unsigned int)w);
 137}
 138
 139static inline unsigned int __arch_hweight16(unsigned int w)
 140{
 141        return __arch_hweight32(w & 0xffff);
 142}
 143
 144static inline unsigned int __arch_hweight8(unsigned int w)
 145{
 146        return __arch_hweight32(w & 0xff);
 147}
 148
 149#endif                          /* _BLACKFIN_BITOPS_H */
 150