diff options
Diffstat (limited to 'arch/m68k/include/asm/bitops.h')
-rw-r--r-- | arch/m68k/include/asm/bitops.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/bitops.h b/arch/m68k/include/asm/bitops.h new file mode 100644 index 0000000..4a3f6b9 --- /dev/null +++ b/arch/m68k/include/asm/bitops.h @@ -0,0 +1,55 @@ +/* + * bitops.h: Bit string operations on the m68k + */ + +#ifndef _M68K_BITOPS_H +#define _M68K_BITOPS_H + +#include <asm/byteorder.h> +#include <asm-generic/bitops/fls.h> +#include <asm-generic/bitops/__fls.h> +#include <asm-generic/bitops/fls64.h> +#include <asm-generic/bitops/__ffs.h> + +extern void set_bit(int nr, volatile void *addr); +extern void clear_bit(int nr, volatile void *addr); +extern void change_bit(int nr, volatile void *addr); +extern int test_and_clear_bit(int nr, volatile void *addr); +extern int test_and_change_bit(int nr, volatile void *addr); + +#ifdef __KERNEL__ + + +static inline int test_bit(int nr, __const__ volatile void *addr) +{ + __const__ unsigned int *p = (__const__ unsigned int *) addr; + + return (p[nr >> 5] & (1UL << (nr & 31))) != 0; +} + +static inline int test_and_set_bit(int nr, volatile void *vaddr) +{ + char retval; + + volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3]; + __asm__ __volatile__ ("bset %2,(%4); sne %0" + : "=d" (retval), "=m" (*p) + : "di" (nr & 7), "m" (*p), "a" (p)); + + return retval; +} + +#define __ffs(x) (ffs(x) - 1) + +/* + * * hweightN: returns the hamming weight (i.e. the number + * * of bits set) of a N-bit word + * */ + +#define hweight32(x) generic_hweight32(x) +#define hweight16(x) generic_hweight16(x) +#define hweight8(x) generic_hweight8(x) + +#endif /* __KERNEL__ */ + +#endif /* _M68K_BITOPS_H */ |