1819833afSPeter Tyser /* 2819833afSPeter Tyser * bitops.h: Bit string operations on the m68k 3819833afSPeter Tyser */ 4819833afSPeter Tyser 5819833afSPeter Tyser #ifndef _M68K_BITOPS_H 6819833afSPeter Tyser #define _M68K_BITOPS_H 7819833afSPeter Tyser 8819833afSPeter Tyser #include <asm/byteorder.h> 9d6715452SFabio Estevam #include <asm-generic/bitops/fls.h> 10d6715452SFabio Estevam #include <asm-generic/bitops/__fls.h> 11d6715452SFabio Estevam #include <asm-generic/bitops/fls64.h> 12d6715452SFabio Estevam #include <asm-generic/bitops/__ffs.h> 13819833afSPeter Tyser 14819833afSPeter Tyser extern void set_bit(int nr, volatile void *addr); 15819833afSPeter Tyser extern void clear_bit(int nr, volatile void *addr); 16819833afSPeter Tyser extern void change_bit(int nr, volatile void *addr); 17819833afSPeter Tyser extern int test_and_clear_bit(int nr, volatile void *addr); 18819833afSPeter Tyser extern int test_and_change_bit(int nr, volatile void *addr); 19819833afSPeter Tyser 20819833afSPeter Tyser #ifdef __KERNEL__ 21819833afSPeter Tyser 22819833afSPeter Tyser 23*44d0677aSMåns Rullgård static inline int test_bit(int nr, __const__ volatile void *addr) 24f7799a11SAlison Wang { 25f7799a11SAlison Wang __const__ unsigned int *p = (__const__ unsigned int *) addr; 26f7799a11SAlison Wang 27f7799a11SAlison Wang return (p[nr >> 5] & (1UL << (nr & 31))) != 0; 28819833afSPeter Tyser } 29f7799a11SAlison Wang 30*44d0677aSMåns Rullgård static inline int test_and_set_bit(int nr, volatile void *vaddr) 31f7799a11SAlison Wang { 32f7799a11SAlison Wang char retval; 33f7799a11SAlison Wang 34f7799a11SAlison Wang volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3]; 35f7799a11SAlison Wang __asm__ __volatile__ ("bset %2,(%4); sne %0" 36f7799a11SAlison Wang : "=d" (retval), "=m" (*p) 37f7799a11SAlison Wang : "di" (nr & 7), "m" (*p), "a" (p)); 38f7799a11SAlison Wang 39f7799a11SAlison Wang return retval; 40819833afSPeter Tyser } 41f7799a11SAlison Wang 42819833afSPeter Tyser #define __ffs(x) (ffs(x) - 1) 43f7799a11SAlison Wang 44f7799a11SAlison Wang /* 45f7799a11SAlison Wang * * hweightN: returns the hamming weight (i.e. the number 46f7799a11SAlison Wang * * of bits set) of a N-bit word 47f7799a11SAlison Wang * */ 48f7799a11SAlison Wang 49f7799a11SAlison Wang #define hweight32(x) generic_hweight32(x) 50f7799a11SAlison Wang #define hweight16(x) generic_hweight16(x) 51f7799a11SAlison Wang #define hweight8(x) generic_hweight8(x) 52819833afSPeter Tyser 53819833afSPeter Tyser #endif /* __KERNEL__ */ 54819833afSPeter Tyser 55819833afSPeter Tyser #endif /* _M68K_BITOPS_H */ 56