Subversion Repositories or1k

#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, long * addr)

{

        int     mask;

        addr += nr >> 5;

        mask = 1 << (nr & 0x1f);

        return ((mask & *addr) != 0);

}

#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 */