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/le.h>
  29 #include <asm-generic/bitops/ext2-non-atomic.h>
  30 #include <asm-generic/bitops/ext2-atomic.h>
  31 #include <asm-generic/bitops/minix.h>
  32
  33 #ifndef CONFIG_SMP
  34 #include <linux/irqflags.h>
  35
  36 /*
  37  * clear_bit may not imply a memory barrier
  38  */
  39 #ifndef smp_mb__before_clear_bit
  40 #define smp_mb__before_clear_bit()      smp_mb()
  41 #define smp_mb__after_clear_bit()       smp_mb()
  42 #endif
  43 #include <asm-generic/bitops/atomic.h>
  44 #include <asm-generic/bitops/non-atomic.h>
  45 #else
  46
  47 #include <asm/byteorder.h>      /* swab32 */
  48 #include <linux/linkage.h>
  49
  50 asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr);
  51
  52 asmlinkage int __raw_bit_clear_asm(volatile unsigned long *addr, int nr);
  53
  54 asmlinkage int __raw_bit_toggle_asm(volatile unsigned long *addr, int nr);
  55
  56 asmlinkage int __raw_bit_test_set_asm(volatile unsigned long *addr, int nr);
  57
  58 asmlinkage int __raw_bit_test_clear_asm(volatile unsigned long *addr, int nr);
  59
  60 asmlinkage int __raw_bit_test_toggle_asm(volatile unsigned long *addr, int nr);
  61
  62 asmlinkage int __raw_bit_test_asm(const volatile unsigned long *addr, int nr);
  63
  64 static inline void set_bit(int nr, volatile unsigned long *addr)
  65 {
  66         volatile unsigned long *a = addr + (nr >> 5);
  67         __raw_bit_set_asm(a, nr & 0x1f);
  68 }
  69
  70 static inline void clear_bit(int nr, volatile unsigned long *addr)
  71 {
  72         volatile unsigned long *a = addr + (nr >> 5);
  73         __raw_bit_clear_asm(a, nr & 0x1f);
  74 }
  75
  76 static inline void change_bit(int nr, volatile unsigned long *addr)
  77 {
  78         volatile unsigned long *a = addr + (nr >> 5);
  79         __raw_bit_toggle_asm(a, nr & 0x1f);
  80 }
  81
  82 static inline int test_bit(int nr, const volatile unsigned long *addr)
  83 {
  84         volatile const unsigned long *a = addr + (nr >> 5);
  85         return __raw_bit_test_asm(a, nr & 0x1f) != 0;
  86 }
  87
  88 static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
  89 {
  90         volatile unsigned long *a = addr + (nr >> 5);
  91         return __raw_bit_test_set_asm(a, nr & 0x1f);
  92 }
  93
  94 static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
  95 {
  96         volatile unsigned long *a = addr + (nr >> 5);
  97         return __raw_bit_test_clear_asm(a, nr & 0x1f);
  98 }
  99
 100 static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
 101 {
 102         volatile unsigned long *a = addr + (nr >> 5);
 103         return __raw_bit_test_toggle_asm(a, nr & 0x1f);
 104 }
 105
 106 /*
 107  * clear_bit() doesn't provide any barrier for the compiler.
 108  */
 109 #define smp_mb__before_clear_bit()      barrier()
 110 #define smp_mb__after_clear_bit()       barrier()
 111
 112 #define test_bit __skip_test_bit
 113 #include <asm-generic/bitops/non-atomic.h>
 114 #undef test_bit
 115
 116 #endif /* CONFIG_SMP */
 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 */