1 /* 2 * bitops.h: Bit string operations on the m68k 3 */ 4 5 #ifndef _M68K_BITOPS_H 6 #define _M68K_BITOPS_H 7 8 #include <linux/config.h> 9 #include <asm/byteorder.h> 10 11 extern void set_bit(int nr, volatile void *addr); 12 extern void clear_bit(int nr, volatile void *addr); 13 extern void change_bit(int nr, volatile void *addr); 14 extern int test_and_set_bit(int nr, volatile void *addr); 15 extern int test_and_clear_bit(int nr, volatile void *addr); 16 extern int test_and_change_bit(int nr, volatile void *addr); 17 18 #ifdef __KERNEL__ 19 20 21 extern inline int test_bit(int nr, __const__ volatile void *addr) 22 { 23 __const__ unsigned int *p = (__const__ unsigned int *) addr; 24 25 return (p[nr >> 5] & (1UL << (nr & 31))) != 0; 26 } 27 28 extern inline int test_and_set_bit(int nr, volatile void *vaddr) 29 { 30 char retval; 31 32 volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3]; 33 __asm__ __volatile__ ("bset %2,(%4); sne %0" 34 : "=d" (retval), "=m" (*p) 35 : "di" (nr & 7), "m" (*p), "a" (p)); 36 37 return retval; 38 } 39 40 #define __ffs(x) (ffs(x) - 1) 41 42 /* 43 * * hweightN: returns the hamming weight (i.e. the number 44 * * of bits set) of a N-bit word 45 * */ 46 47 #define hweight32(x) generic_hweight32(x) 48 #define hweight16(x) generic_hweight16(x) 49 #define hweight8(x) generic_hweight8(x) 50 51 #endif /* __KERNEL__ */ 52 53 #endif /* _M68K_BITOPS_H */ 54