diff options
| author | Alistair Francis <alistair.francis@xilinx.com> | 2016-07-04 13:06:36 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2016-07-04 13:15:22 +0100 |
| commit | ae2923b5c20a21c6457680330506a9c13873485c (patch) | |
| tree | 4f8a8e5e6cd6dde4a72a048395f0f9cabc452424 | |
| parent | 5d636e21c44ecf982a22a7bc4ca89186079ac283 (diff) | |
bitops: Add MAKE_64BIT_MASK macro
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.francis@xilinx.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 9773244aa1c8c26b8b82cb261d8f5dd4b7b9fcf9.1467053537.git.alistair.francis@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | include/qemu/bitops.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 15418a86df..98fb005aba 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 |