move Rust sources to top level, C sources into c_src

[bcachefs-tools-debian] / c_src / include / linux / bitmap.h

diff --git a/c_src/include/linux/bitmap.h b/c_src/include/linux/bitmap.h
new file mode 100644 (file)
index 0000000..db2dfdb
--- /dev/null
+++ b/c_src/include/linux/bitmap.h
@@ -0,0 +1,146 @@
+#ifndef _PERF_BITOPS_H
+#define _PERF_BITOPS_H
+
+#include <string.h>
+#include <linux/bitops.h>
+#include <stdlib.h>
+
+#define DECLARE_BITMAP(name,bits) \
+       unsigned long name[BITS_TO_LONGS(bits)]
+
+void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
+                const unsigned long *bitmap2, int bits);
+
+#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
+
+#define BITMAP_LAST_WORD_MASK(nbits)                                   \
+(                                                                      \
+       ((nbits) % BITS_PER_LONG) ?                                     \
+               (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
+)
+
+#define small_const_nbits(nbits) \
+       (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
+
+static inline int __bitmap_weight(const unsigned long *bitmap, int bits)
+{
+       int k, w = 0, lim = bits/BITS_PER_LONG;
+
+       for (k = 0; k < lim; k++)
+               w += hweight_long(bitmap[k]);
+
+       if (bits % BITS_PER_LONG)
+               w += hweight_long(bitmap[k] & BITMAP_LAST_WORD_MASK(bits));
+
+       return w;
+} 
+
+static inline int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
+                const unsigned long *bitmap2, unsigned int bits)
+{
+       unsigned int k;
+       unsigned int lim = bits/BITS_PER_LONG;
+       unsigned long result = 0;
+
+       for (k = 0; k < lim; k++)
+               result |= (dst[k] = bitmap1[k] & bitmap2[k]);
+       if (bits % BITS_PER_LONG)
+               result |= (dst[k] = bitmap1[k] & bitmap2[k] &
+                          BITMAP_LAST_WORD_MASK(bits));
+       return result != 0;
+}
+
+static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,
+                                    unsigned int bits)
+{
+       unsigned int k, lim = bits/BITS_PER_LONG;
+       for (k = 0; k < lim; ++k)
+               dst[k] = ~src[k];
+
+       if (bits % BITS_PER_LONG)
+               dst[k] = ~src[k];
+}
+
+static inline void bitmap_zero(unsigned long *dst, int nbits)
+{
+       memset(dst, 0, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
+}
+
+static inline int bitmap_weight(const unsigned long *src, int nbits)
+{
+       if (small_const_nbits(nbits))
+               return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
+       return __bitmap_weight(src, nbits);
+}
+
+static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
+                            const unsigned long *src2, int nbits)
+{
+       if (small_const_nbits(nbits))
+               *dst = *src1 | *src2;
+       else
+               __bitmap_or(dst, src1, src2, nbits);
+}
+
+static inline unsigned long *bitmap_alloc(int nbits)
+{
+       return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
+}
+
+static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
+                            const unsigned long *src2, unsigned int nbits)
+{
+       if (small_const_nbits(nbits))
+               return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
+       return __bitmap_and(dst, src1, src2, nbits);
+}
+
+static inline unsigned long _find_next_bit(const unsigned long *addr,
+               unsigned long nbits, unsigned long start, unsigned long invert)
+{
+       unsigned long tmp;
+
+       if (!nbits || start >= nbits)
+               return nbits;
+
+       tmp = addr[start / BITS_PER_LONG] ^ invert;
+
+       /* Handle 1st word. */
+       tmp &= BITMAP_FIRST_WORD_MASK(start);
+       start = round_down(start, BITS_PER_LONG);
+
+       while (!tmp) {
+               start += BITS_PER_LONG;
+               if (start >= nbits)
+                       return nbits;
+
+               tmp = addr[start / BITS_PER_LONG] ^ invert;
+       }
+
+       return min(start + __ffs(tmp), nbits);
+}
+
+static inline unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
+                           unsigned long offset)
+{
+       return _find_next_bit(addr, size, offset, 0UL);
+}
+
+static inline unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
+                                unsigned long offset)
+{
+       return _find_next_bit(addr, size, offset, ~0UL);
+}
+
+#define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
+#define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
+
+static inline bool bitmap_empty(const unsigned long *src, unsigned nbits)
+{
+       if (small_const_nbits(nbits))
+               return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
+
+       return find_first_bit(src, nbits) == nbits;
+}
+
+#endif /* _PERF_BITOPS_H */