include/minix/bitmap.h

   1 #ifndef _BITMAP_H
   2 #define _BITMAP_H
   3
   4 /* Bit map operations to manipulate bits of a simple mask variable. */
   5 #define bit_set(mask, n)        ((mask) |= (1 << (n)))
   6 #define bit_unset(mask, n)      ((mask) &= ~(1 << (n)))
   7 #define bit_isset(mask, n)      ((mask) & (1 << (n)))
   8 #define bit_empty(mask)         ((mask) = 0)
   9 #define bit_fill(mask)          ((mask) = ~0)
  10
  11 /* Definitions previously in kernel/const.h */
  12 #define BITCHUNK_BITS   (sizeof(bitchunk_t) * CHAR_BIT)
  13 #define BITMAP_CHUNKS(nr_bits) (((nr_bits)+BITCHUNK_BITS-1)/BITCHUNK_BITS)
  14 #define MAP_CHUNK(map,bit) (map)[((bit)/BITCHUNK_BITS)]
  15 #define CHUNK_OFFSET(bit) ((bit)%BITCHUNK_BITS)
  16 #define GET_BIT(map,bit) ( MAP_CHUNK(map,bit) & (1 << CHUNK_OFFSET(bit) ))
  17 #define SET_BIT(map,bit) ( MAP_CHUNK(map,bit) |= (1 << CHUNK_OFFSET(bit) ))
  18 #define UNSET_BIT(map,bit) ( MAP_CHUNK(map,bit) &= ~(1 << CHUNK_OFFSET(bit) ))
  19
  20 #if defined(CONFIG_SMP) && defined(__GNUC__)
  21 #ifndef __ASSEMBLY__
  22 static inline bits_fill(bitchunk_t * chunks, unsigned bits)
  23 {
  24         unsigned c, cnt;
  25
  26         cnt = BITMAP_CHUNKS(bits);
  27         for (c = 0; c < cnt; c++)
  28                 bit_fill(chunks[c]);
  29 }
  30 #endif
  31 #endif
  32
  33
  34 #endif  /* _BITMAP_H */