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bitmap: provide to_le/from_le helpers

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Provide helpers to convert bitmaps to little endian format. It can be
used when we want to send one bitmap via network to some other hosts.

One thing to mention is that, these helpers only solve the problem of
endianess, but it does not solve the problem of different word size on
machines (the bitmaps managing same count of bits may contains different
size when malloced). So we need to take care of the size alignment issue
on the callers for now.

Backports commit d7788151a0807d5d2d410e3f8944d8c8a651f8d2 from qemu
This commit is contained in:
Peter Xu 2018-03-05 01:11:11 -05:00 committed by Lioncash
parent 3d5fa79305
commit 4956effd11
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 43 additions and 0 deletions
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10
qemu/include/qemu/bitmap.h
View file

@ -30,6 +30,8 @@
* bitmap_set_atomic(dst, pos, nbits) Set specified bit area with atomic ops
* bitmap_clear(dst, pos, nbits) Clear specified bit area
* bitmap_test_and_clear_atomic(dst, pos, nbits) Test and clear area
* bitmap_to_le(dst, src, nbits) Convert bitmap to little endian
* bitmap_from_le(dst, src, nbits) Convert bitmap from little endian
*/
/*
@ -48,6 +50,9 @@
#define DECLARE_BITMAP(name,bits) \
unsigned long name[BITS_TO_LONGS(bits)]
#define small_nbits(nbits) \
((nbits) <= BITS_PER_LONG)
long slow_bitmap_count_one(const unsigned long *bitmap, long nbits);
static inline unsigned long *bitmap_try_new(long nbits)
@ -90,4 +95,9 @@ static inline unsigned long *bitmap_zero_extend(unsigned long *old,
return new;
}
void bitmap_to_le(unsigned long *dst, const unsigned long *src,
long nbits);
void bitmap_from_le(unsigned long *dst, const unsigned long *src,
long nbits);
#endif /* BITMAP_H */

33
qemu/util/bitmap.c
View file

@ -163,3 +163,36 @@ long slow_bitmap_count_one(const unsigned long *bitmap, long nbits)
return result;
}
static void bitmap_to_from_le(unsigned long *dst,
const unsigned long *src, long nbits)
{
long len = BITS_TO_LONGS(nbits);
#ifdef HOST_WORDS_BIGENDIAN
long index;
for (index = 0; index < len; index++) {
# if HOST_LONG_BITS == 64
dst[index] = bswap64(src[index]);
# else
dst[index] = bswap32(src[index]);
# endif
}
#else
memcpy(dst, src, len * sizeof(unsigned long));
#endif
}
void bitmap_from_le(unsigned long *dst, const unsigned long *src,
long nbits)
{
bitmap_to_from_le(dst, src, nbits);
}
void bitmap_to_le(unsigned long *dst, const unsigned long *src,
long nbits)
{
bitmap_to_from_le(dst, src, nbits);
}