diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/bswap.h | 70 |
1 files changed, 59 insertions, 11 deletions
diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h index ce3c42e4d9..09c78fd28a 100644 --- a/include/qemu/bswap.h +++ b/include/qemu/bswap.h @@ -80,6 +80,64 @@ static inline void bswap64s(uint64_t *s) #define be_bswaps(p, size) do { *p = glue(bswap, size)(*p); } while(0) #endif +/** + * Endianness conversion functions between host cpu and specified endianness. + * (We list the complete set of prototypes produced by the macros below + * to assist people who search the headers to find their definitions.) + * + * uint16_t le16_to_cpu(uint16_t v); + * uint32_t le32_to_cpu(uint32_t v); + * uint64_t le64_to_cpu(uint64_t v); + * uint16_t be16_to_cpu(uint16_t v); + * uint32_t be32_to_cpu(uint32_t v); + * uint64_t be64_to_cpu(uint64_t v); + * + * Convert the value @v from the specified format to the native + * endianness of the host CPU by byteswapping if necessary, and + * return the converted value. + * + * uint16_t cpu_to_le16(uint16_t v); + * uint32_t cpu_to_le32(uint32_t v); + * uint64_t cpu_to_le64(uint64_t v); + * uint16_t cpu_to_be16(uint16_t v); + * uint32_t cpu_to_be32(uint32_t v); + * uint64_t cpu_to_be64(uint64_t v); + * + * Convert the value @v from the native endianness of the host CPU to + * the specified format by byteswapping if necessary, and return + * the converted value. + * + * void le16_to_cpus(uint16_t *v); + * void le32_to_cpus(uint32_t *v); + * void le64_to_cpus(uint64_t *v); + * void be16_to_cpus(uint16_t *v); + * void be32_to_cpus(uint32_t *v); + * void be64_to_cpus(uint64_t *v); + * + * Do an in-place conversion of the value pointed to by @v from the + * specified format to the native endianness of the host CPU. + * + * void cpu_to_le16s(uint16_t *v); + * void cpu_to_le32s(uint32_t *v); + * void cpu_to_le64s(uint64_t *v); + * void cpu_to_be16s(uint16_t *v); + * void cpu_to_be32s(uint32_t *v); + * void cpu_to_be64s(uint64_t *v); + * + * Do an in-place conversion of the value pointed to by @v from the + * native endianness of the host CPU to the specified format. + * + * Both X_to_cpu() and cpu_to_X() perform the same operation; you + * should use whichever one is better documenting of the function your + * code is performing. + * + * Do not use these functions for conversion of values which are in guest + * memory, since the data may not be sufficiently aligned for the host CPU's + * load and store instructions. Instead you should use the ld*_p() and + * st*_p() functions, which perform loads and stores of data of any + * required size and endianness and handle possible misalignment. + */ + #define CPU_CONVERT(endian, size, type)\ static inline type endian ## size ## _to_cpu(type v)\ {\ @@ -99,16 +157,6 @@ static inline void endian ## size ## _to_cpus(type *p)\ static inline void cpu_to_ ## endian ## size ## s(type *p)\ {\ glue(endian, _bswaps)(p, size);\ -}\ -\ -static inline type endian ## size ## _to_cpup(const type *p)\ -{\ - return glue(glue(endian, size), _to_cpu)(*p);\ -}\ -\ -static inline void cpu_to_ ## endian ## size ## w(type *p, type v)\ -{\ - *p = glue(glue(cpu_to_, endian), size)(v);\ } CPU_CONVERT(be, 16, uint16_t) @@ -126,7 +174,7 @@ static inline uint32_t qemu_bswap_len(uint32_t value, int len) } /* - * Same as cpu_to_le{16,23}, except that gcc will figure the result is + * Same as cpu_to_le{16,32}, except that gcc will figure the result is * a compile-time constant if you pass in a constant. So this can be * used to initialize static variables. */ |