#ifndef _ASM_GENERIC_BITOPS_H_#define _ASM_GENERIC_BITOPS_H_ /* * For the benefit of those who are trying to port Linux to another * architecture, here are some C-language equivalents.  You should * recode these in the native assembly language, if at all possible. * To guarantee atomicity, these routines call cli() and sti() to * disable interrupts while they operate.  (You have to provide inline * routines to cli() and sti().) * * Also note, these routines assume that you have 32 bit longs. * You will have to change this if you are trying to port Linux to the * Alpha architecture or to a Cray.  :-) *  * C language equivalents written by Theodore Ts'o, 9/26/92 */ extern __inline__ int set_bit(int nr,long * addr){	int	mask, retval; 	addr += nr >> 5;	mask = 1 << (nr & 0x1f);	cli();	retval = (mask & *addr) != 0;	*addr |= mask;	sti();	return retval;} extern __inline__ int clear_bit(int nr, long * addr){	int	mask, retval; 	addr += nr >> 5;	mask = 1 << (nr & 0x1f);	cli();	retval = (mask & *addr) != 0;	*addr &= ~mask;	sti();	return retval;} extern __inline__ int test_bit(int nr, const unsigned long * addr){	int	mask; 	addr += nr >> 5;	mask = 1 << (nr & 0x1f);	return ((mask & *addr) != 0);} /* * fls: find last bit set. */ #define fls(x) generic_fls(x) #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). */ #define ffs(x) generic_ffs(x) /* * 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 /* _ASM_GENERIC_BITOPS_H */