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-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
  49 asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr);
  50
  51 asmlinkage int __raw_bit_clear_asm(volatile unsigned long *addr, int nr);
  52
  53 asmlinkage int __raw_bit_toggle_asm(volatile unsigned long *addr, int nr);
  54
  55 asmlinkage int __raw_bit_test_set_asm(volatile unsigned long *addr, int nr);
  56
  57 asmlinkage int __raw_bit_test_clear_asm(volatile unsigned long *addr, int nr);
  58
  59 asmlinkage int __raw_bit_test_toggle_asm(volatile unsigned long *addr, int nr);
  60
  61 asmlinkage int __raw_bit_test_asm(const volatile unsigned long *addr, int nr);
  62
  63 static 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
  69 static 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
  75 static 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
  81 static 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
  87 static 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
  93 static 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
  99 static 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
 122 static 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
 132 static inline unsigned int __arch_hweight64(__u64 w)
 133 {
 134         return __arch_hweight32((unsigned int)(w >> 32)) +
 135                __arch_hweight32((unsigned int)w);
 136 }
 137
 138 static inline unsigned int __arch_hweight16(unsigned int w)
 139 {
 140         return __arch_hweight32(w & 0xffff);
 141 }
 142
 143 static inline unsigned int __arch_hweight8(unsigned int w)
 144 {
 145         return __arch_hweight32(w & 0xff);
 146 }
 147
 148 #endif                          /* _BLACKFIN_BITOPS_H */