From: Alistair Francis <alistair.fran...@xilinx.com> Add a macro that creates a 64bit value which has length number of ones shifted across by the value of shift.
Signed-off-by: Alistair Francis <alistair.fran...@xilinx.com> Reviewed-by: Alex Bennée <alex.ben...@linaro.org> Reviewed-by: Peter Maydell <peter.mayd...@linaro.org> Message-id: 9773244aa1c8c26b8b82cb261d8f5dd4b7b9fcf9.1467053537.git.alistair.fran...@xilinx.com Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> --- include/qemu/bitops.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 15418a8..98fb005 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -24,6 +24,9 @@ #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) +#define MAKE_64BIT_MASK(shift, length) \ + (((~0ULL) >> (64 - (length))) << (shift)) + /** * set_bit - Set a bit in memory * @nr: the bit to set -- 1.9.1
