| Message ID | 912f91bdbccf665fddd51b186027a3ae702d768a.1457470980.git.alistair.francis@xilinx.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Alistair Francis <alistair.francis@xilinx.com> writes: > Add a macro that creates a 64bit value which has length number of ones > shifted acrros by the value of shift. > > Signed-off-by: Alistair Francis <alistair.francis@xilinx.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> > --- > V5: > - Re-write to a 64-bit mask instead of ONES() > - Re-order this patch in the series > > include/qemu/bitops.h | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h > index 755fdd1..3c45791 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) \ > + (((1ull << (length)) - 1) << shift) > + > /** > * set_bit - Set a bit in memory > * @nr: the bit to set -- Alex Bennée
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 755fdd1..3c45791 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) \ + (((1ull << (length)) - 1) << shift) + /** * set_bit - Set a bit in memory * @nr: the bit to set
Add a macro that creates a 64bit value which has length number of ones shifted acrros by the value of shift. Signed-off-by: Alistair Francis <alistair.francis@xilinx.com> --- V5: - Re-write to a 64-bit mask instead of ONES() - Re-order this patch in the series include/qemu/bitops.h | 3 +++ 1 file changed, 3 insertions(+)