On Mon, Feb 27, 2023 at 05:03:08PM +0000, Jonathan Cameron wrote: > From: Ira Weiny <ira.we...@intel.com> > > CXL has 24 bit unaligned fields which need to be stored to. CXL is > specified as little endian. > > Define st24_le_p() and the supporting functions to store such a field > from a 32 bit host native value. > > The use of b, w, l, q as the size specifier is limiting. So "24" was > used for the size part of the function name. > > Signed-off-by: Ira Weiny <ira.we...@intel.com> > Signed-off-by: Jonathan Cameron <jonathan.came...@huawei.com> >
Reviewed-by: Fan Ni <fan...@samsung.com> > --- > v7: > - Pulled this patch out of the CXL events series as Ira pointed > out it can be used to simplify this series. > --- > include/qemu/bswap.h | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) > > diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h > index 15a78c0db5..ee71cbeaaa 100644 > --- a/include/qemu/bswap.h > +++ b/include/qemu/bswap.h > @@ -8,11 +8,23 @@ > #undef bswap64 > #define bswap64(_x) __builtin_bswap64(_x) > > +static inline uint32_t bswap24(uint32_t x) > +{ > + return (((x & 0x000000ffU) << 16) | > + ((x & 0x0000ff00U) << 0) | > + ((x & 0x00ff0000U) >> 16)); > +} > + > static inline void bswap16s(uint16_t *s) > { > *s = __builtin_bswap16(*s); > } > > +static inline void bswap24s(uint32_t *s) > +{ > + *s = bswap24(*s); > +} > + > static inline void bswap32s(uint32_t *s) > { > *s = __builtin_bswap32(*s); > @@ -176,6 +188,7 @@ CPU_CONVERT(le, 64, uint64_t) > * size is: > * b: 8 bits > * w: 16 bits > + * 24: 24 bits > * l: 32 bits > * q: 64 bits > * > @@ -248,6 +261,11 @@ static inline void stw_he_p(void *ptr, uint16_t v) > __builtin_memcpy(ptr, &v, sizeof(v)); > } > > +static inline void st24_he_p(void *ptr, uint32_t v) > +{ > + __builtin_memcpy(ptr, &v, 3); > +} > + > static inline int ldl_he_p(const void *ptr) > { > int32_t r; > @@ -297,6 +315,11 @@ static inline void stw_le_p(void *ptr, uint16_t v) > stw_he_p(ptr, le_bswap(v, 16)); > } > > +static inline void st24_le_p(void *ptr, uint32_t v) > +{ > + st24_he_p(ptr, le_bswap(v, 24)); > +} > + > static inline void stl_le_p(void *ptr, uint32_t v) > { > stl_he_p(ptr, le_bswap(v, 32)); > -- > 2.37.2 > >