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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.  
  148. #define BITMAP_LAST_WORD_MASK(nbits)                                    \
  149. (                                                                       \
  150.         ((nbits) % BITS_PER_LONG) ?                                     \
  151.                 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
  152. )
  153.  
  154. #define small_const_nbits(nbits) \
  155.         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  156.  
  157. static inline void bitmap_zero(unsigned long *dst, int nbits)
  158. {
  159.         if (small_const_nbits(nbits))
  160.                 *dst = 0UL;
  161.         else {
  162.                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  163.                 memset(dst, 0, len);
  164.         }
  165. }
  166.  
  167. static inline void bitmap_fill(unsigned long *dst, int nbits)
  168. {
  169.         size_t nlongs = BITS_TO_LONGS(nbits);
  170.         if (!small_const_nbits(nbits)) {
  171.                 int len = (nlongs - 1) * sizeof(unsigned long);
  172.                 memset(dst, 0xff,  len);
  173.         }
  174.         dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
  175. }
  176.  
  177. static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
  178.                         int nbits)
  179. {
  180.         if (small_const_nbits(nbits))
  181.                 *dst = *src;
  182.         else {
  183.                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  184.                 memcpy(dst, src, len);
  185.         }
  186. }
  187.  
  188. static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
  189.                         const unsigned long *src2, int nbits)
  190. {
  191.         if (small_const_nbits(nbits))
  192.                 return (*dst = *src1 & *src2) != 0;
  193.         return __bitmap_and(dst, src1, src2, nbits);
  194. }
  195.  
  196. static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
  197.                         const unsigned long *src2, int nbits)
  198. {
  199.         if (small_const_nbits(nbits))
  200.                 *dst = *src1 | *src2;
  201.         else
  202.                 __bitmap_or(dst, src1, src2, nbits);
  203. }
  204.  
  205. static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
  206.                         const unsigned long *src2, int nbits)
  207. {
  208.         if (small_const_nbits(nbits))
  209.                 *dst = *src1 ^ *src2;
  210.         else
  211.                 __bitmap_xor(dst, src1, src2, nbits);
  212. }
  213.  
  214. static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1,
  215.                         const unsigned long *src2, int nbits)
  216. {
  217.         if (small_const_nbits(nbits))
  218.                 return (*dst = *src1 & ~(*src2)) != 0;
  219.         return __bitmap_andnot(dst, src1, src2, nbits);
  220. }
  221.  
  222. static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,
  223.                         int nbits)
  224. {
  225.         if (small_const_nbits(nbits))
  226.                 *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits);
  227.         else
  228.                 __bitmap_complement(dst, src, nbits);
  229. }
  230.  
  231. static inline int bitmap_equal(const unsigned long *src1,
  232.                         const unsigned long *src2, int nbits)
  233. {
  234.         if (small_const_nbits(nbits))
  235.                 return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
  236.         else
  237.                 return __bitmap_equal(src1, src2, nbits);
  238. }
  239.  
  240. static inline int bitmap_intersects(const unsigned long *src1,
  241.                         const unsigned long *src2, int nbits)
  242. {
  243.         if (small_const_nbits(nbits))
  244.                 return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
  245.         else
  246.                 return __bitmap_intersects(src1, src2, nbits);
  247. }
  248.  
  249. static inline int bitmap_subset(const unsigned long *src1,
  250.                         const unsigned long *src2, int nbits)
  251. {
  252.         if (small_const_nbits(nbits))
  253.                 return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits));
  254.         else
  255.                 return __bitmap_subset(src1, src2, nbits);
  256. }
  257.  
  258. static inline int bitmap_empty(const unsigned long *src, int nbits)
  259. {
  260.         if (small_const_nbits(nbits))
  261.                 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
  262.         else
  263.                 return __bitmap_empty(src, nbits);
  264. }
  265.  
  266. static inline int bitmap_full(const unsigned long *src, int nbits)
  267. {
  268.         if (small_const_nbits(nbits))
  269.                 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
  270.         else
  271.                 return __bitmap_full(src, nbits);
  272. }
  273.  
  274. static inline int bitmap_weight(const unsigned long *src, int nbits)
  275. {
  276.         if (small_const_nbits(nbits))
  277.                 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
  278.         return __bitmap_weight(src, nbits);
  279. }
  280.  
  281. static inline void bitmap_shift_right(unsigned long *dst,
  282.                         const unsigned long *src, int n, int nbits)
  283. {
  284.         if (small_const_nbits(nbits))
  285.                 *dst = *src >> n;
  286.         else
  287.                 __bitmap_shift_right(dst, src, n, nbits);
  288. }
  289.  
  290. static inline void bitmap_shift_left(unsigned long *dst,
  291.                         const unsigned long *src, int n, int nbits)
  292. {
  293.         if (small_const_nbits(nbits))
  294.                 *dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits);
  295.         else
  296.                 __bitmap_shift_left(dst, src, n, nbits);
  297. }
  298.  
  299. static inline int bitmap_parse(const char *buf, unsigned int buflen,
  300.                         unsigned long *maskp, int nmaskbits)
  301. {
  302.         return __bitmap_parse(buf, buflen, 0, maskp, nmaskbits);
  303. }
  304.  
  305. #endif /* __ASSEMBLY__ */
  306.  
  307. #endif /* __LINUX_BITMAP_H */
  308.