bordoisila_bits.h

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#ifndef __BORDOISILA_BITS_H__
#define __BORDOISILA_BITS_H__
 
#include <stdint.h>
 
#define BITS_PER_BYTE 8
#define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE)
 
#define BORDOISILA_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
#define BITS_TO_LONGS(nr)  BORDOISILA_DIV_ROUND_UP(nr, BITS_PER_LONG)
#define BORDOISILA_BITS_PER_TYPE(type)  (sizeof(type) * BITS_PER_BYTE)
 
 
#define BORDOISILA_BIT(nr)   (1UL << (nr))
#define BORDOISILA_GENMASK(h, l)  (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
 
static inline int __bf_shf(uint32_t mask) {
    if (mask == 0) return 0;
    int shift = 0;
    while ((mask & 1) == 0) {
        mask >>= 1;
        shift++;
    }
    return shift;
}
 
#define BORDOISILA_GET_FIELD(_mask, _reg)    (((_reg) & (_mask)) >> __bf_shf(_mask))
 
#define BORDOISILA_PREP_FIELD(_mask, _val) \
       (((_val) << __bf_shf(_mask)) & (_mask))
 
#endif