54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/*
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* bitops.h: Bit string operations on the m68k
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*/
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#ifndef _M68K_BITOPS_H
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#define _M68K_BITOPS_H
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#include <linux/config.h>
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#include <asm/byteorder.h>
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extern void set_bit(int nr, volatile void *addr);
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extern void clear_bit(int nr, volatile void *addr);
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extern void change_bit(int nr, volatile void *addr);
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extern int test_and_set_bit(int nr, volatile void *addr);
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extern int test_and_clear_bit(int nr, volatile void *addr);
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extern int test_and_change_bit(int nr, volatile void *addr);
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#ifdef __KERNEL__
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extern inline int test_bit(int nr, __const__ volatile void *addr)
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{
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__const__ unsigned int *p = (__const__ unsigned int *) addr;
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return (p[nr >> 5] & (1UL << (nr & 31))) != 0;
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}
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extern inline int test_and_set_bit(int nr, volatile void *vaddr)
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{
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char retval;
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volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3];
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__asm__ __volatile__ ("bset %2,(%4); sne %0"
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: "=d" (retval), "=m" (*p)
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: "di" (nr & 7), "m" (*p), "a" (p));
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return retval;
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}
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#define __ffs(x) (ffs(x) - 1)
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/*
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* * hweightN: returns the hamming weight (i.e. the number
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* * of bits set) of a N-bit word
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* */
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#define hweight32(x) generic_hweight32(x)
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#define hweight16(x) generic_hweight16(x)
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#define hweight8(x) generic_hweight8(x)
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#endif /* __KERNEL__ */
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#endif /* _M68K_BITOPS_H */
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