#ifndef _PZ_GENERIC_BITOPS_H_
#define _PZ_GENERIC_BITOPS_H_
/* this is from linux kernel header */
/*
* 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
*/
/*
* Converted to be independent of the size of longs.
* Zephaniah E. Hull 2005-08-15.
*/
static inline int set_bit(unsigned int nr, unsigned long * addr)
{
unsigned long mask;
int retval;
addr += nr / (sizeof(unsigned long) * 8);
mask = 1UL << (nr % (sizeof(unsigned long) * 8));
retval = (mask & *addr) != 0;
*addr |= mask;
return retval;
}
static inline int clear_bit(unsigned int nr, unsigned long * addr)
{
unsigned long mask;
int retval;
addr += nr / (sizeof(unsigned long) * 8);
mask = 1UL << (nr % (sizeof(unsigned long) * 8));
retval = (mask & *addr) != 0;
*addr &= ~mask;
return retval;
}
static inline int test_bit(unsigned int nr, unsigned long * addr)
{
unsigned long mask;
addr += nr / (sizeof(unsigned long) * 8);
mask = 1UL << (nr % (sizeof(unsigned long) * 8));
return ((mask & *addr) != 0);
}
#endif /* _PZ_GENERIC_BITOPS_H */