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56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
#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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/*
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* Converted to be independent of the size of longs.
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* Zephaniah E. Hull 2005-08-15.
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*/
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static inline int set_bit(unsigned int nr, unsigned long * addr)
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{
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unsigned long mask;
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int retval;
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addr += nr / (sizeof(unsigned long) * 8);
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mask = 1UL << (nr % (sizeof(unsigned long) * 8));
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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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static inline int clear_bit(unsigned int nr, unsigned long * addr)
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{
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unsigned long mask;
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int retval;
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addr += nr / (sizeof(unsigned long) * 8);
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mask = 1UL << (nr % (sizeof(unsigned long) * 8));
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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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static inline int test_bit(unsigned int nr, unsigned long * addr)
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{
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unsigned long mask;
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addr += nr / (sizeof(unsigned long) * 8);
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mask = 1UL << (nr % (sizeof(unsigned long) * 8));
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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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