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