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