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
  47 asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr);
  48
  49 asmlinkage int __raw_bit_clear_asm(volatile unsigned long *addr, int nr);
  50
  51 asmlinkage int __raw_bit_toggle_asm(volatile unsigned long *addr, int nr);
  52
  53 asmlinkage int __raw_bit_test_set_asm(volatile unsigned long *addr, int nr);
  54
  55 asmlinkage int __raw_bit_test_clear_asm(volatile unsigned long *addr, int nr);
  56
  57 asmlinkage int __raw_bit_test_toggle_asm(volatile unsigned long *addr, int nr);
  58
  59 asmlinkage int __raw_bit_test_asm(const volatile unsigned long *addr, int nr);
  60
  61 static 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
  67 static 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
  73 static 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
  79 static 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
  85 static 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
  91 static 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
  97 static 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
 123 static 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
 133 static inline unsigned int __arch_hweight64(__u64 w)
 134 {
 135         return __arch_hweight32((unsigned int)(w >> 32)) +
 136                __arch_hweight32((unsigned int)w);
 137 }
 138
 139 static inline unsigned int __arch_hweight16(unsigned int w)
 140 {
 141         return __arch_hweight32(w & 0xffff);
 142 }
 143
 144 static inline unsigned int __arch_hweight8(unsigned int w)
 145 {
 146         return __arch_hweight32(w & 0xff);
 147 }
 148
 149 #endif                          /* _BLACKFIN_BITOPS_H */