From: "Dr. David Alan Gilbert" <dgilb...@redhat.com> e.g. BIT_RANGE(15, 0) gives 0xff00
Suggested by: Paolo Bonzini <pbonz...@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com> --- include/qemu/bitops.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 755fdd1..e411688 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -23,6 +23,9 @@ #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) +/* e.g. BIT_RANGE(15, 0) -> 0xff00 */ +#define BIT_RANGE(hb, lb) ((2ull << (hb)) - (1ull << (lb))) + /** * set_bit - Set a bit in memory -- 2.7.4
