include/asm-sh/bitops.h

   1 #ifndef __ASM_SH_BITOPS_H
   2 #define __ASM_SH_BITOPS_H
   3
   4 #ifdef __KERNEL__
   5
   6 #ifndef _LINUX_BITOPS_H
   7 #error only <linux/bitops.h> can be included directly
   8 #endif
   9
  10 #include <asm/system.h>
  11 /* For __swab32 */
  12 #include <asm/byteorder.h>
  13
  14 static inline void set_bit(int nr, volatile void * addr)
  15 {
  16         int     mask;
  17         volatile unsigned int *a = addr;
  18         unsigned long flags;
  19
  20         a += nr >> 5;
  21         mask = 1 << (nr & 0x1f);
  22         local_irq_save(flags);
  23         *a |= mask;
  24         local_irq_restore(flags);
  25 }
  26
  27 /*
  28  * clear_bit() doesn't provide any barrier for the compiler.
  29  */
  30 #define smp_mb__before_clear_bit()      barrier()
  31 #define smp_mb__after_clear_bit()       barrier()
  32 static inline void clear_bit(int nr, volatile void * addr)
  33 {
  34         int     mask;
  35         volatile unsigned int *a = addr;
  36         unsigned long flags;
  37
  38         a += nr >> 5;
  39         mask = 1 << (nr & 0x1f);
  40         local_irq_save(flags);
  41         *a &= ~mask;
  42         local_irq_restore(flags);
  43 }
  44
  45 static inline void change_bit(int nr, volatile void * addr)
  46 {
  47         int     mask;
  48         volatile unsigned int *a = addr;
  49         unsigned long flags;
  50
  51         a += nr >> 5;
  52         mask = 1 << (nr & 0x1f);
  53         local_irq_save(flags);
  54         *a ^= mask;
  55         local_irq_restore(flags);
  56 }
  57
  58 static inline int test_and_set_bit(int nr, volatile void * addr)
  59 {
  60         int     mask, retval;
  61         volatile unsigned int *a = addr;
  62         unsigned long flags;
  63
  64         a += nr >> 5;
  65         mask = 1 << (nr & 0x1f);
  66         local_irq_save(flags);
  67         retval = (mask & *a) != 0;
  68         *a |= mask;
  69         local_irq_restore(flags);
  70
  71         return retval;
  72 }
  73
  74 static inline int test_and_clear_bit(int nr, volatile void * addr)
  75 {
  76         int     mask, retval;
  77         volatile unsigned int *a = addr;
  78         unsigned long flags;
  79
  80         a += nr >> 5;
  81         mask = 1 << (nr & 0x1f);
  82         local_irq_save(flags);
  83         retval = (mask & *a) != 0;
  84         *a &= ~mask;
  85         local_irq_restore(flags);
  86
  87         return retval;
  88 }
  89
  90 static inline int test_and_change_bit(int nr, volatile void * addr)
  91 {
  92         int     mask, retval;
  93         volatile unsigned int *a = addr;
  94         unsigned long flags;
  95
  96         a += nr >> 5;
  97         mask = 1 << (nr & 0x1f);
  98         local_irq_save(flags);
  99         retval = (mask & *a) != 0;
 100         *a ^= mask;
 101         local_irq_restore(flags);
 102
 103         return retval;
 104 }
 105
 106 #include <asm-generic/bitops/non-atomic.h>
 107
 108 static inline unsigned long ffz(unsigned long word)
 109 {
 110         unsigned long result;
 111
 112         __asm__("1:\n\t"
 113                 "shlr   %1\n\t"
 114                 "bt/s   1b\n\t"
 115                 " add   #1, %0"
 116                 : "=r" (result), "=r" (word)
 117                 : "0" (~0L), "1" (word)
 118                 : "t");
 119         return result;
 120 }
 121
 122 /**
 123  * __ffs - find first bit in word.
 124  * @word: The word to search
 125  *
 126  * Undefined if no bit exists, so code should check against 0 first.
 127  */
 128 static inline unsigned long __ffs(unsigned long word)
 129 {
 130         unsigned long result;
 131
 132         __asm__("1:\n\t"
 133                 "shlr   %1\n\t"
 134                 "bf/s   1b\n\t"
 135                 " add   #1, %0"
 136                 : "=r" (result), "=r" (word)
 137                 : "0" (~0L), "1" (word)
 138                 : "t");
 139         return result;
 140 }
 141
 142 #include <asm-generic/bitops/find.h>
 143 #include <asm-generic/bitops/ffs.h>
 144 #include <asm-generic/bitops/hweight.h>
 145 #include <asm-generic/bitops/lock.h>
 146 #include <asm-generic/bitops/sched.h>
 147 #include <asm-generic/bitops/ext2-non-atomic.h>
 148 #include <asm-generic/bitops/ext2-atomic.h>
 149 #include <asm-generic/bitops/minix.h>
 150 #include <asm-generic/bitops/fls.h>
 151 #include <asm-generic/bitops/fls64.h>
 152
 153 #endif /* __KERNEL__ */
 154
 155 #endif /* __ASM_SH_BITOPS_H */