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 <linux/config.h> 9819833afSPeter Tyser #include <asm/byteorder.h> 10819833afSPeter Tyser 11819833afSPeter Tyser extern void set_bit(int nr, volatile void *addr); 12819833afSPeter Tyser extern void clear_bit(int nr, volatile void *addr); 13819833afSPeter Tyser extern void change_bit(int nr, volatile void *addr); 14819833afSPeter Tyser extern int test_and_set_bit(int nr, volatile void *addr); 15819833afSPeter Tyser extern int test_and_clear_bit(int nr, volatile void *addr); 16819833afSPeter Tyser extern int test_and_change_bit(int nr, volatile void *addr); 17819833afSPeter Tyser 18819833afSPeter Tyser #ifdef __KERNEL__ 19819833afSPeter Tyser 20819833afSPeter Tyser 21*f7799a11SAlison Wang extern inline int test_bit(int nr, __const__ volatile void *addr) 22*f7799a11SAlison Wang { 23*f7799a11SAlison Wang __const__ unsigned int *p = (__const__ unsigned int *) addr; 24*f7799a11SAlison Wang 25*f7799a11SAlison Wang return (p[nr >> 5] & (1UL << (nr & 31))) != 0; 26819833afSPeter Tyser } 27*f7799a11SAlison Wang 28*f7799a11SAlison Wang extern inline int test_and_set_bit(int nr, volatile void *vaddr) 29*f7799a11SAlison Wang { 30*f7799a11SAlison Wang char retval; 31*f7799a11SAlison Wang 32*f7799a11SAlison Wang volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3]; 33*f7799a11SAlison Wang __asm__ __volatile__ ("bset %2,(%4); sne %0" 34*f7799a11SAlison Wang : "=d" (retval), "=m" (*p) 35*f7799a11SAlison Wang : "di" (nr & 7), "m" (*p), "a" (p)); 36*f7799a11SAlison Wang 37*f7799a11SAlison Wang return retval; 38819833afSPeter Tyser } 39*f7799a11SAlison Wang 40819833afSPeter Tyser #define __ffs(x) (ffs(x) - 1) 41*f7799a11SAlison Wang 42*f7799a11SAlison Wang /* 43*f7799a11SAlison Wang * * hweightN: returns the hamming weight (i.e. the number 44*f7799a11SAlison Wang * * of bits set) of a N-bit word 45*f7799a11SAlison Wang * */ 46*f7799a11SAlison Wang 47*f7799a11SAlison Wang #define hweight32(x) generic_hweight32(x) 48*f7799a11SAlison Wang #define hweight16(x) generic_hweight16(x) 49*f7799a11SAlison Wang #define hweight8(x) generic_hweight8(x) 50819833afSPeter Tyser 51819833afSPeter Tyser #endif /* __KERNEL__ */ 52819833afSPeter Tyser 53819833afSPeter Tyser #endif /* _M68K_BITOPS_H */ 54