diff options
Diffstat (limited to 'arch/m68k/include/asm')
| -rw-r--r-- | arch/m68k/include/asm/bitops.h | 59 |
1 files changed, 27 insertions, 32 deletions
diff --git a/arch/m68k/include/asm/bitops.h b/arch/m68k/include/asm/bitops.h index ad971b4f3..525d90ccb 100644 --- a/arch/m68k/include/asm/bitops.h +++ b/arch/m68k/include/asm/bitops.h @@ -17,41 +17,36 @@ extern int test_and_change_bit(int nr, volatile void *addr); #ifdef __KERNEL__ -/* - * ffs: find first bit set. This is defined the same way as - * the libc and compiler builtin ffs routines, therefore - * differs in spirit from the above ffz (man ffs). - */ -extern __inline__ int ffs(int x) + +extern inline int test_bit(int nr, __const__ volatile void *addr) { - int r = 1; - - if (!x) - return 0; - if (!(x & 0xffff)) { - x >>= 16; - r += 16; - } - if (!(x & 0xff)) { - x >>= 8; - r += 8; - } - if (!(x & 0xf)) { - x >>= 4; - r += 4; - } - if (!(x & 3)) { - x >>= 2; - r += 2; - } - if (!(x & 1)) { - x >>= 1; - r += 1; - } - return r; + __const__ unsigned int *p = (__const__ unsigned int *) addr; + + return (p[nr >> 5] & (1UL << (nr & 31))) != 0; } + +extern 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) -#define PLATFORM_FFS + +/* + * * 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__ */ |