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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 list
  59.  * bitmap_find_free_region(bitmap, bits, order) Find and allocate bit region
  60.  * bitmap_release_region(bitmap, pos, order)    Free specified bit region
  61.  * bitmap_allocate_region(bitmap, pos, order)   Allocate specified bit region
  62.  */
  63.  
  64. /*
  65.  * Also the following operations in asm/bitops.h apply to bitmaps.
  66.  *
  67.  * set_bit(bit, addr)                   *addr |= bit
  68.  * clear_bit(bit, addr)                 *addr &= ~bit
  69.  * change_bit(bit, addr)                *addr ^= bit
  70.  * test_bit(bit, addr)                  Is bit set in *addr?
  71.  * test_and_set_bit(bit, addr)          Set bit and return old value
  72.  * test_and_clear_bit(bit, addr)        Clear bit and return old value
  73.  * test_and_change_bit(bit, addr)       Change bit and return old value
  74.  * find_first_zero_bit(addr, nbits)     Position first zero bit in *addr
  75.  * find_first_bit(addr, nbits)          Position first set bit in *addr
  76.  * find_next_zero_bit(addr, nbits, bit) Position next zero bit in *addr >= bit
  77.  * find_next_bit(addr, nbits, bit)      Position next set bit in *addr >= bit
  78.  */
  79.  
  80. /*
  81.  * The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used
  82.  * to declare an array named 'name' of just enough unsigned longs to
  83.  * contain all bit positions from 0 to 'bits' - 1.
  84.  */
  85.  
  86. /*
  87.  * lib/bitmap.c provides these functions:
  88.  */
  89.  
  90. extern int __bitmap_empty(const unsigned long *bitmap, int bits);
  91. extern int __bitmap_full(const unsigned long *bitmap, int bits);
  92. extern int __bitmap_equal(const unsigned long *bitmap1,
  93.                         const unsigned long *bitmap2, int bits);
  94. extern void __bitmap_complement(unsigned long *dst, const unsigned long *src,
  95.                         int bits);
  96. extern void __bitmap_shift_right(unsigned long *dst,
  97.                         const unsigned long *src, int shift, int bits);
  98. extern void __bitmap_shift_left(unsigned long *dst,
  99.                         const unsigned long *src, int shift, int bits);
  100. extern int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
  101.                         const unsigned long *bitmap2, int bits);
  102. extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
  103.                         const unsigned long *bitmap2, int bits);
  104. extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,
  105.                         const unsigned long *bitmap2, int bits);
  106. extern int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
  107.                         const unsigned long *bitmap2, int bits);
  108. extern int __bitmap_intersects(const unsigned long *bitmap1,
  109.                         const unsigned long *bitmap2, int bits);
  110. extern int __bitmap_subset(const unsigned long *bitmap1,
  111.                         const unsigned long *bitmap2, int bits);
  112. extern int __bitmap_weight(const unsigned long *bitmap, int bits);
  113.  
  114. extern void bitmap_set(unsigned long *map, int i, int len);
  115. extern void bitmap_clear(unsigned long *map, int start, int nr);
  116. extern unsigned long bitmap_find_next_zero_area(unsigned long *map,
  117.                                          unsigned long size,
  118.                                          unsigned long start,
  119.                                          unsigned int nr,
  120.                                          unsigned long align_mask);
  121.  
  122. extern int bitmap_scnprintf(char *buf, unsigned int len,
  123.                         const unsigned long *src, int nbits);
  124. extern int __bitmap_parse(const char *buf, unsigned int buflen, int is_user,
  125.                         unsigned long *dst, int nbits);
  126. extern int bitmap_parse_user(const char __user *ubuf, unsigned int ulen,
  127.                         unsigned long *dst, int nbits);
  128. extern int bitmap_scnlistprintf(char *buf, unsigned int len,
  129.                         const unsigned long *src, int nbits);
  130. extern int bitmap_parselist(const char *buf, unsigned long *maskp,
  131.                         int nmaskbits);
  132. extern void bitmap_remap(unsigned long *dst, const unsigned long *src,
  133.                 const unsigned long *old, const unsigned long *new, int bits);
  134. extern int bitmap_bitremap(int oldbit,
  135.                 const unsigned long *old, const unsigned long *new, int bits);
  136. extern void bitmap_onto(unsigned long *dst, const unsigned long *orig,
  137.                 const unsigned long *relmap, int bits);
  138. extern void bitmap_fold(unsigned long *dst, const unsigned long *orig,
  139.                 int sz, int bits);
  140. extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
  141. extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
  142. extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
  143. extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits);
  144.  
  145. #define BITMAP_LAST_WORD_MASK(nbits)                                    \
  146. (                                                                       \
  147.         ((nbits) % BITS_PER_LONG) ?                                     \
  148.                 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
  149. )
  150.  
  151. #define small_const_nbits(nbits) \
  152.         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  153.  
  154. static inline void bitmap_zero(unsigned long *dst, int nbits)
  155. {
  156.         if (small_const_nbits(nbits))
  157.                 *dst = 0UL;
  158.         else {
  159.                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  160.                 memset(dst, 0, len);
  161.         }
  162. }
  163.  
  164. static inline void bitmap_fill(unsigned long *dst, int nbits)
  165. {
  166.         size_t nlongs = BITS_TO_LONGS(nbits);
  167.         if (!small_const_nbits(nbits)) {
  168.                 int len = (nlongs - 1) * sizeof(unsigned long);
  169.                 memset(dst, 0xff,  len);
  170.         }
  171.         dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
  172. }
  173.  
  174. static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
  175.                         int nbits)
  176. {
  177.         if (small_const_nbits(nbits))
  178.                 *dst = *src;
  179.         else {
  180.                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  181.                 memcpy(dst, src, len);
  182.         }
  183. }
  184.  
  185. static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
  186.                         const unsigned long *src2, int nbits)
  187. {
  188.         if (small_const_nbits(nbits))
  189.                 return (*dst = *src1 & *src2) != 0;
  190.         return __bitmap_and(dst, src1, src2, nbits);
  191. }
  192.  
  193. static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
  194.                         const unsigned long *src2, int nbits)
  195. {
  196.         if (small_const_nbits(nbits))
  197.                 *dst = *src1 | *src2;
  198.         else
  199.                 __bitmap_or(dst, src1, src2, nbits);
  200. }
  201.  
  202. static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
  203.                         const unsigned long *src2, int nbits)
  204. {
  205.         if (small_const_nbits(nbits))
  206.                 *dst = *src1 ^ *src2;
  207.         else
  208.                 __bitmap_xor(dst, src1, src2, nbits);
  209. }
  210.  
  211. static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1,
  212.                         const unsigned long *src2, int nbits)
  213. {
  214.         if (small_const_nbits(nbits))
  215.                 return (*dst = *src1 & ~(*src2)) != 0;
  216.         return __bitmap_andnot(dst, src1, src2, nbits);
  217. }
  218.  
  219. static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,
  220.                         int nbits)
  221. {
  222.         if (small_const_nbits(nbits))
  223.                 *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits);
  224.         else
  225.                 __bitmap_complement(dst, src, nbits);
  226. }
  227.  
  228. static inline int bitmap_equal(const unsigned long *src1,
  229.                         const unsigned long *src2, int nbits)
  230. {
  231.         if (small_const_nbits(nbits))
  232.                 return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
  233.         else
  234.                 return __bitmap_equal(src1, src2, nbits);
  235. }
  236.  
  237. static inline int bitmap_intersects(const unsigned long *src1,
  238.                         const unsigned long *src2, int nbits)
  239. {
  240.         if (small_const_nbits(nbits))
  241.                 return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
  242.         else
  243.                 return __bitmap_intersects(src1, src2, nbits);
  244. }
  245.  
  246. static inline int bitmap_subset(const unsigned long *src1,
  247.                         const unsigned long *src2, int nbits)
  248. {
  249.         if (small_const_nbits(nbits))
  250.                 return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits));
  251.         else
  252.                 return __bitmap_subset(src1, src2, nbits);
  253. }
  254.  
  255. static inline int bitmap_empty(const unsigned long *src, int nbits)
  256. {
  257.         if (small_const_nbits(nbits))
  258.                 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
  259.         else
  260.                 return __bitmap_empty(src, nbits);
  261. }
  262.  
  263. static inline int bitmap_full(const unsigned long *src, int nbits)
  264. {
  265.         if (small_const_nbits(nbits))
  266.                 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
  267.         else
  268.                 return __bitmap_full(src, nbits);
  269. }
  270.  
  271. static inline int bitmap_weight(const unsigned long *src, int nbits)
  272. {
  273.         if (small_const_nbits(nbits))
  274.                 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
  275.         return __bitmap_weight(src, nbits);
  276. }
  277.  
  278. static inline void bitmap_shift_right(unsigned long *dst,
  279.                         const unsigned long *src, int n, int nbits)
  280. {
  281.         if (small_const_nbits(nbits))
  282.                 *dst = *src >> n;
  283.         else
  284.                 __bitmap_shift_right(dst, src, n, nbits);
  285. }
  286.  
  287. static inline void bitmap_shift_left(unsigned long *dst,
  288.                         const unsigned long *src, int n, int nbits)
  289. {
  290.         if (small_const_nbits(nbits))
  291.                 *dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits);
  292.         else
  293.                 __bitmap_shift_left(dst, src, n, nbits);
  294. }
  295.  
  296. static inline int bitmap_parse(const char *buf, unsigned int buflen,
  297.                         unsigned long *maskp, int nmaskbits)
  298. {
  299.         return __bitmap_parse(buf, buflen, 0, maskp, nmaskbits);
  300. }
  301.  
  302. #endif /* __ASSEMBLY__ */
  303.  
  304. #endif /* __LINUX_BITMAP_H */
  305.