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  1. #ifndef __LINUX_BITMAP_H
  2. #define __LINUX_BITMAP_H
  3.  
  4. #ifndef __ASSEMBLY__
  5.  
  6. #include <linux/types.h>
  7. #include <linux/bitops.h>
  8. #include <linux/string.h>
  9. #include <linux/kernel.h>
  10.  
  11. /*
  12.  * bitmaps provide bit arrays that consume one or more unsigned
  13.  * longs.  The bitmap interface and available operations are listed
  14.  * here, in bitmap.h
  15.  *
  16.  * Function implementations generic to all architectures are in
  17.  * lib/bitmap.c.  Functions implementations that are architecture
  18.  * specific are in various include/asm-<arch>/bitops.h headers
  19.  * and other arch/<arch> specific files.
  20.  *
  21.  * See lib/bitmap.c for more details.
  22.  */
  23.  
  24. /*
  25.  * The available bitmap operations and their rough meaning in the
  26.  * case that the bitmap is a single unsigned long are thus:
  27.  *
  28.  * Note that nbits should be always a compile time evaluable constant.
  29.  * Otherwise many inlines will generate horrible code.
  30.  *
  31.  * bitmap_zero(dst, nbits)                      *dst = 0UL
  32.  * bitmap_fill(dst, nbits)                      *dst = ~0UL
  33.  * bitmap_copy(dst, src, nbits)                 *dst = *src
  34.  * bitmap_and(dst, src1, src2, nbits)           *dst = *src1 & *src2
  35.  * bitmap_or(dst, src1, src2, nbits)            *dst = *src1 | *src2
  36.  * bitmap_xor(dst, src1, src2, nbits)           *dst = *src1 ^ *src2
  37.  * bitmap_andnot(dst, src1, src2, nbits)        *dst = *src1 & ~(*src2)
  38.  * bitmap_complement(dst, src, nbits)           *dst = ~(*src)
  39.  * bitmap_equal(src1, src2, nbits)              Are *src1 and *src2 equal?
  40.  * bitmap_intersects(src1, src2, nbits)         Do *src1 and *src2 overlap?
  41.  * bitmap_subset(src1, src2, nbits)             Is *src1 a subset of *src2?
  42.  * bitmap_empty(src, nbits)                     Are all bits zero in *src?
  43.  * bitmap_full(src, nbits)                      Are all bits set in *src?
  44.  * bitmap_weight(src, nbits)                    Hamming Weight: number set bits
  45.  * bitmap_set(dst, pos, nbits)                  Set specified bit area
  46.  * bitmap_clear(dst, pos, nbits)                Clear specified bit area
  47.  * bitmap_find_next_zero_area(buf, len, pos, n, mask)   Find bit free area
  48.  * bitmap_shift_right(dst, src, n, nbits)       *dst = *src >> n
  49.  * bitmap_shift_left(dst, src, n, nbits)        *dst = *src << n
  50.  * bitmap_remap(dst, src, old, new, nbits)      *dst = map(old, new)(src)
  51.  * bitmap_bitremap(oldbit, old, new, nbits)     newbit = map(old, new)(oldbit)
  52.  * bitmap_onto(dst, orig, relmap, nbits)        *dst = orig relative to relmap
  53.  * bitmap_fold(dst, orig, sz, nbits)            dst bits = orig bits mod sz
  54.  * bitmap_scnprintf(buf, len, src, nbits)       Print bitmap src to buf
  55.  * bitmap_parse(buf, buflen, dst, nbits)        Parse bitmap dst from kernel buf
  56.  * bitmap_parse_user(ubuf, ulen, dst, nbits)    Parse bitmap dst from user buf
  57.  * bitmap_scnlistprintf(buf, len, src, nbits)   Print bitmap src as list to buf
  58.  * bitmap_parselist(buf, dst, nbits)            Parse bitmap dst from kernel buf
  59.  * bitmap_parselist_user(buf, dst, nbits)       Parse bitmap dst from user buf
  60.  * bitmap_find_free_region(bitmap, bits, order) Find and allocate bit region
  61.  * bitmap_release_region(bitmap, pos, order)    Free specified bit region
  62.  * bitmap_allocate_region(bitmap, pos, order)   Allocate specified bit region
  63.  */
  64.  
  65. /*
  66.  * Also the following operations in asm/bitops.h apply to bitmaps.
  67.  *
  68.  * set_bit(bit, addr)                   *addr |= bit
  69.  * clear_bit(bit, addr)                 *addr &= ~bit
  70.  * change_bit(bit, addr)                *addr ^= bit
  71.  * test_bit(bit, addr)                  Is bit set in *addr?
  72.  * test_and_set_bit(bit, addr)          Set bit and return old value
  73.  * test_and_clear_bit(bit, addr)        Clear bit and return old value
  74.  * test_and_change_bit(bit, addr)       Change bit and return old value
  75.  * find_first_zero_bit(addr, nbits)     Position first zero bit in *addr
  76.  * find_first_bit(addr, nbits)          Position first set bit in *addr
  77.  * find_next_zero_bit(addr, nbits, bit) Position next zero bit in *addr >= bit
  78.  * find_next_bit(addr, nbits, bit)      Position next set bit in *addr >= bit
  79.  */
  80.  
  81. /*
  82.  * The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used
  83.  * to declare an array named 'name' of just enough unsigned longs to
  84.  * contain all bit positions from 0 to 'bits' - 1.
  85.  */
  86.  
  87. /*
  88.  * lib/bitmap.c provides these functions:
  89.  */
  90.  
  91. extern int __bitmap_empty(const unsigned long *bitmap, int bits);
  92. extern int __bitmap_full(const unsigned long *bitmap, int bits);
  93. extern int __bitmap_equal(const unsigned long *bitmap1,
  94.                         const unsigned long *bitmap2, int bits);
  95. extern void __bitmap_complement(unsigned long *dst, const unsigned long *src,
  96.                         int bits);
  97. extern void __bitmap_shift_right(unsigned long *dst,
  98.                         const unsigned long *src, int shift, int bits);
  99. extern void __bitmap_shift_left(unsigned long *dst,
  100.                         const unsigned long *src, int shift, int bits);
  101. extern int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
  102.                         const unsigned long *bitmap2, int bits);
  103. extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
  104.                         const unsigned long *bitmap2, int bits);
  105. extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,
  106.                         const unsigned long *bitmap2, int bits);
  107. extern int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
  108.                         const unsigned long *bitmap2, int bits);
  109. extern int __bitmap_intersects(const unsigned long *bitmap1,
  110.                         const unsigned long *bitmap2, int bits);
  111. extern int __bitmap_subset(const unsigned long *bitmap1,
  112.                         const unsigned long *bitmap2, int bits);
  113. extern int __bitmap_weight(const unsigned long *bitmap, int bits);
  114.  
  115. extern void bitmap_set(unsigned long *map, int i, int len);
  116. extern void bitmap_clear(unsigned long *map, int start, int nr);
  117. extern unsigned long bitmap_find_next_zero_area(unsigned long *map,
  118.                                          unsigned long size,
  119.                                          unsigned long start,
  120.                                          unsigned int nr,
  121.                                          unsigned long align_mask);
  122.  
  123. extern int bitmap_scnprintf(char *buf, unsigned int len,
  124.                         const unsigned long *src, int nbits);
  125. extern int __bitmap_parse(const char *buf, unsigned int buflen, int is_user,
  126.                         unsigned long *dst, int nbits);
  127. extern int bitmap_parse_user(const char __user *ubuf, unsigned int ulen,
  128.                         unsigned long *dst, int nbits);
  129. extern int bitmap_scnlistprintf(char *buf, unsigned int len,
  130.                         const unsigned long *src, int nbits);
  131. extern int bitmap_parselist(const char *buf, unsigned long *maskp,
  132.                         int nmaskbits);
  133. extern int bitmap_parselist_user(const char __user *ubuf, unsigned int ulen,
  134.                         unsigned long *dst, int nbits);
  135. extern void bitmap_remap(unsigned long *dst, const unsigned long *src,
  136.                 const unsigned long *old, const unsigned long *new, int bits);
  137. extern int bitmap_bitremap(int oldbit,
  138.                 const unsigned long *old, const unsigned long *new, int bits);
  139. extern void bitmap_onto(unsigned long *dst, const unsigned long *orig,
  140.                 const unsigned long *relmap, int bits);
  141. extern void bitmap_fold(unsigned long *dst, const unsigned long *orig,
  142.                 int sz, int bits);
  143. extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
  144. extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
  145. extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
  146. extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits);
  147. extern int bitmap_ord_to_pos(const unsigned long *bitmap, int n, int bits);
  148.  
  149. #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) % BITS_PER_LONG))
  150. #define BITMAP_LAST_WORD_MASK(nbits)                                    \
  151. (                                                                       \
  152.         ((nbits) % BITS_PER_LONG) ?                                     \
  153.                 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
  154. )
  155.  
  156. #define small_const_nbits(nbits) \
  157.         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  158.  
  159. static inline void bitmap_zero(unsigned long *dst, int nbits)
  160. {
  161.         if (small_const_nbits(nbits))
  162.                 *dst = 0UL;
  163.         else {
  164.                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  165.                 memset(dst, 0, len);
  166.         }
  167. }
  168.  
  169. static inline void bitmap_fill(unsigned long *dst, int nbits)
  170. {
  171.         size_t nlongs = BITS_TO_LONGS(nbits);
  172.         if (!small_const_nbits(nbits)) {
  173.                 int len = (nlongs - 1) * sizeof(unsigned long);
  174.                 memset(dst, 0xff,  len);
  175.         }
  176.         dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
  177. }
  178.  
  179. static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
  180.                         int nbits)
  181. {
  182.         if (small_const_nbits(nbits))
  183.                 *dst = *src;
  184.         else {
  185.                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  186.                 memcpy(dst, src, len);
  187.         }
  188. }
  189.  
  190. static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
  191.                         const unsigned long *src2, int nbits)
  192. {
  193.         if (small_const_nbits(nbits))
  194.                 return (*dst = *src1 & *src2) != 0;
  195.         return __bitmap_and(dst, src1, src2, nbits);
  196. }
  197.  
  198. static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
  199.                         const unsigned long *src2, int nbits)
  200. {
  201.         if (small_const_nbits(nbits))
  202.                 *dst = *src1 | *src2;
  203.         else
  204.                 __bitmap_or(dst, src1, src2, nbits);
  205. }
  206.  
  207. static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
  208.                         const unsigned long *src2, int nbits)
  209. {
  210.         if (small_const_nbits(nbits))
  211.                 *dst = *src1 ^ *src2;
  212.         else
  213.                 __bitmap_xor(dst, src1, src2, nbits);
  214. }
  215.  
  216. static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1,
  217.                         const unsigned long *src2, int nbits)
  218. {
  219.         if (small_const_nbits(nbits))
  220.                 return (*dst = *src1 & ~(*src2)) != 0;
  221.         return __bitmap_andnot(dst, src1, src2, nbits);
  222. }
  223.  
  224. static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,
  225.                         int nbits)
  226. {
  227.         if (small_const_nbits(nbits))
  228.                 *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits);
  229.         else
  230.                 __bitmap_complement(dst, src, nbits);
  231. }
  232.  
  233. static inline int bitmap_equal(const unsigned long *src1,
  234.                         const unsigned long *src2, int nbits)
  235. {
  236.         if (small_const_nbits(nbits))
  237.                 return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
  238.         else
  239.                 return __bitmap_equal(src1, src2, nbits);
  240. }
  241.  
  242. static inline int bitmap_intersects(const unsigned long *src1,
  243.                         const unsigned long *src2, int nbits)
  244. {
  245.         if (small_const_nbits(nbits))
  246.                 return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
  247.         else
  248.                 return __bitmap_intersects(src1, src2, nbits);
  249. }
  250.  
  251. static inline int bitmap_subset(const unsigned long *src1,
  252.                         const unsigned long *src2, int nbits)
  253. {
  254.         if (small_const_nbits(nbits))
  255.                 return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits));
  256.         else
  257.                 return __bitmap_subset(src1, src2, nbits);
  258. }
  259.  
  260. static inline int bitmap_empty(const unsigned long *src, int nbits)
  261. {
  262.         if (small_const_nbits(nbits))
  263.                 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
  264.         else
  265.                 return __bitmap_empty(src, nbits);
  266. }
  267.  
  268. static inline int bitmap_full(const unsigned long *src, int nbits)
  269. {
  270.         if (small_const_nbits(nbits))
  271.                 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
  272.         else
  273.                 return __bitmap_full(src, nbits);
  274. }
  275.  
  276. static inline int bitmap_weight(const unsigned long *src, int nbits)
  277. {
  278.         if (small_const_nbits(nbits))
  279.                 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
  280.         return __bitmap_weight(src, nbits);
  281. }
  282.  
  283. static inline void bitmap_shift_right(unsigned long *dst,
  284.                         const unsigned long *src, int n, int nbits)
  285. {
  286.         if (small_const_nbits(nbits))
  287.                 *dst = *src >> n;
  288.         else
  289.                 __bitmap_shift_right(dst, src, n, nbits);
  290. }
  291.  
  292. static inline void bitmap_shift_left(unsigned long *dst,
  293.                         const unsigned long *src, int n, int nbits)
  294. {
  295.         if (small_const_nbits(nbits))
  296.                 *dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits);
  297.         else
  298.                 __bitmap_shift_left(dst, src, n, nbits);
  299. }
  300.  
  301. static inline int bitmap_parse(const char *buf, unsigned int buflen,
  302.                         unsigned long *maskp, int nmaskbits)
  303. {
  304.         return __bitmap_parse(buf, buflen, 0, maskp, nmaskbits);
  305. }
  306.  
  307. #endif /* __ASSEMBLY__ */
  308.  
  309. #endif /* __LINUX_BITMAP_H */
  310.