| Message ID | 20230303150908.27889-4-Jonathan.Cameron@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | hw/cxl: Poison get, inject, clear | expand |
On 3/3/23 16:09, Jonathan Cameron wrote: > From: Ira Weiny <ira.weiny@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. > > Reviewed-by: Fan Ni <fan.ni@samsung.com> > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > > --- > v8: > - Picked up tag from Fan Ni. > --- > 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) > +{ Could it be safer to add: assert(x & 0xff000000U == 0); ... > + 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); ... and here use: *s = bswap24(*s & 0x00ffffffU); ? > +} > + > 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 Following the pattern, shouldn't this be 's' for sēsquiword? Regardless you need to update the doc in docs/devel/loads-stores.rst. > * 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)); > +}
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));