On 9/8/21 10:19 AM, Yang Zhong wrote: > The Qemu should enable bit mask macro like Linux did in the > kernel, the GENMASK(h, l) and GENMASK_ULL(h, l) will set the > bit to 1 from l to h bit in the 32 bit or 64 bit long type. > > Signed-off-by: Yang Zhong <yang.zh...@intel.com> > --- > include/qemu/bitops.h | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h > index 03213ce952..04dec60670 100644 > --- a/include/qemu/bitops.h > +++ b/include/qemu/bitops.h > @@ -18,6 +18,7 @@ > > #define BITS_PER_BYTE CHAR_BIT > #define BITS_PER_LONG (sizeof (unsigned long) * BITS_PER_BYTE) > +#define BITS_PER_LONG_LONG 64 > > #define BIT(nr) (1UL << (nr)) > #define BIT_ULL(nr) (1ULL << (nr)) > @@ -28,6 +29,12 @@ > #define MAKE_64BIT_MASK(shift, length) \ > (((~0ULL) >> (64 - (length))) << (shift)) > > +#define GENMASK(h, l) \ > + (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h)))) > + > +#define GENMASK_ULL(h, l) \ > + (((~0ULL) << (l)) & (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
What is the difference with MAKE_64BIT_MASK()??
