#include <cfg/compiler.h>
#include <cpu/attr.h>
+#include <cpu/detect.h>
+#include <cpu/types.h>
+#include <cfg/macros.h>
/**
* Swap upper and lower bytes in a 16-bit value.
*/
-INLINE uint16_t swab16(uint16_t x)
-{
- return ((x & (uint16_t)0x00FFU) << 8)
- | ((x & (uint16_t)0xFF00U) >> 8);
-}
+#define SWAB16(x) ((uint16_t)(ROTR((x), 8) + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint16_t))))
+/*
+ * On Cortex-M3, GCC 4.4 builtin implementation is slower than our own
+ * rot-based implementation.
+ */
+#if GNUC_PREREQ(4, 3) && !CPU_CM3
+#define SWAB32(x) ((uint32_t)(__builtin_bswap32((x) + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t)))))
+#else
/**
* Reverse bytes in a 32-bit value (e.g.: 0x12345678 -> 0x78563412).
*/
-INLINE uint32_t swab32(uint32_t x)
-{
- return ((x & (uint32_t)0x000000FFUL) << 24)
- | ((x & (uint32_t)0x0000FF00UL) << 8)
- | ((x & (uint32_t)0x00FF0000UL) >> 8)
- | ((x & (uint32_t)0xFF000000UL) >> 24);
-}
-
+#define SWAB32(x) ((uint32_t)(( \
+ (ROTR(x, 8) & 0xFF00FF00) | \
+ (ROTL(x, 8) & 0x00FF00FF))) + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t)))
+#endif
+
+#if GNUC_PREREQ(4, 3)
+#define SWAB64(x) ((uint64_t)(__builtin_bswap64((x) + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t)))))
+#else
/**
* Reverse bytes in a 64-bit value.
*/
-INLINE uint64_t swab64(uint64_t x)
-{
- return (uint64_t)swab32(x >> 32)
- | ((uint64_t)swab32(x & 0xFFFFFFFFUL) << 32);
-}
+#define SWAB64(x) ((uint64_t)( \
+ (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
+ (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
+ (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
+ (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \
+ (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \
+ (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
+ (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
+ (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56) + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
+#endif
+
+#if CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN
+#define cpu_to_le16(x) ((uint16_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint16_t))))
+#define cpu_to_le32(x) ((uint32_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t))))
+#define cpu_to_le64(x) ((uint64_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
+#define cpu_to_be16(x) SWAB16(x)
+#define cpu_to_be32(x) SWAB32(x)
+#define cpu_to_be64(x) SWAB64(x)
+#elif CPU_BYTE_ORDER == CPU_BIG_ENDIAN
+#define cpu_to_le16(x) SWAB16(x)
+#define cpu_to_le32(x) SWAB32(x)
+#define cpu_to_le64(x) SWAB64(x)
+#define cpu_to_be16(x) ((uint16_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint16_t))))
+#define cpu_to_be32(x) ((uint32_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t))))
+#define cpu_to_be64(x) ((uint64_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
+#else
+#error "unrecognized CPU endianness"
+#endif
+
+#define be16_to_cpu(x) cpu_to_be16(x)
+#define le16_to_cpu(x) cpu_to_le16(x)
+#define be32_to_cpu(x) cpu_to_be32(x)
+#define le32_to_cpu(x) cpu_to_le32(x)
+#define be64_to_cpu(x) cpu_to_be64(x)
+#define le64_to_cpu(x) cpu_to_le64(x)
+
+#define host_to_net16(x) cpu_to_be16(x)
+#define net_to_host16(x) be16_to_cpu(x)
+#define host_to_net32(x) cpu_to_be32(x)
+#define net_to_host32(x) be32_to_cpu(x)
+#define host_to_net64(x) cpu_to_be64(x)
+#define net_to_host64(x) be64_to_cpu(x)
/**
* Reverse bytes in a float value.
/* Avoid breaking strict aliasing rules. */
char *cx = (char *)(&x);
STATIC_ASSERT(sizeof(float) == 4);
- #define BYTEORDER_SWAP(a, b) ((a) ^= (b) ^= (a) ^= (b))
+ #define BYTEORDER_SWAP(a, b) do { (a) ^= (b); (b) ^= (a); (a) ^= (b); } while(0)
BYTEORDER_SWAP(cx[0], cx[3]);
BYTEORDER_SWAP(cx[1], cx[2]);
#undef BYTEORDER_SWAP
return x;
}
-INLINE uint16_t cpu_to_be16(uint16_t x)
-{
- return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab16(x) : x;
-}
-
-INLINE uint16_t cpu_to_le16(uint16_t x)
-{
- return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab16(x) : x;
-}
-
-INLINE uint32_t cpu_to_be32(uint32_t x)
-{
- return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab32(x) : x;
-}
-
-INLINE uint32_t cpu_to_le32(uint32_t x)
-{
- return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab32(x) : x;
-}
-
-INLINE uint64_t cpu_to_be64(uint64_t x)
-{
- return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab64(x) : x;
-}
-
-INLINE uint64_t cpu_to_le64(uint64_t x)
-{
- return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab64(x) : x;
-}
-
INLINE float cpu_to_be_float(float x)
{
return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab_float(x) : x;
return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab_float(x) : x;
}
-INLINE uint16_t be16_to_cpu(uint16_t x)
-{
- return cpu_to_be16(x);
-}
-
-INLINE uint16_t le16_to_cpu(uint16_t x)
-{
- return cpu_to_le16(x);
-}
-
-INLINE uint32_t be32_to_cpu(uint32_t x)
-{
- return cpu_to_be32(x);
-}
-
-INLINE uint32_t le32_to_cpu(uint32_t x)
-{
- return cpu_to_le32(x);
-}
-
-INLINE uint64_t be64_to_cpu(uint64_t x)
-{
- return cpu_to_be64(x);
-}
-
-INLINE uint64_t le64_to_cpu(uint64_t x)
-{
- return cpu_to_le64(x);
-}
-
INLINE float be_float_to_cpu(float x)
{
return cpu_to_be_float(x);
return cpu_to_le_float(x);
}
-INLINE uint16_t host_to_net16(uint16_t x)
+INLINE float host_to_net_float(float x)
{
- return cpu_to_be16(x);
+ return cpu_to_be_float(x);
}
-INLINE uint16_t net_to_host16(uint16_t x)
+INLINE float net_to_host_float(float x)
{
- return be16_to_cpu(x);
+ return be_float_to_cpu(x);
}
-INLINE uint32_t host_to_net32(uint32_t x)
+#if CPU_ARM
+INLINE cpu_atomic_t
+cpu_atomic_xchg(volatile cpu_atomic_t *ptr, cpu_atomic_t val)
{
- return cpu_to_be32(x);
-}
+ cpu_atomic_t ret;
-INLINE uint32_t net_to_host32(uint32_t x)
-{
- return be32_to_cpu(x);
-}
+ asm volatile(
+ "swp %0, %1, [%2]"
-INLINE uint64_t host_to_net64(uint64_t x)
-{
- return cpu_to_be64(x);
-}
+ : "=&r" (ret)
+ : "r" (val), "r" (ptr)
+ : "memory", "cc");
-INLINE uint64_t net_to_host64(uint64_t x)
-{
- return be64_to_cpu(x);
+ return ret;
}
+#else /* CPU_ARM */
+#include <cpu/irq.h>
-INLINE float host_to_net_float(float x)
+INLINE cpu_atomic_t
+cpu_atomic_xchg(volatile cpu_atomic_t *ptr, cpu_atomic_t val)
{
- return cpu_to_be_float(x);
-}
+ cpu_atomic_t ret;
-INLINE float net_to_host_float(float x)
-{
- return be_float_to_cpu(x);
+ ATOMIC(
+ ret = *ptr;
+ *ptr = val;
+ );
+ return ret;
}
+#endif /* CPU_ARM */
#ifdef __cplusplus
template<typename T>
INLINE T swab(T x);
-template<> INLINE uint16_t swab(uint16_t x) { return swab16(x); }
-template<> INLINE uint32_t swab(uint32_t x) { return swab32(x); }
-template<> INLINE uint64_t swab(uint64_t x) { return swab64(x); }
-template<> INLINE int16_t swab(int16_t x) { return static_cast<int16_t>(swab16(static_cast<uint16_t>(x))); }
-template<> INLINE int32_t swab(int32_t x) { return static_cast<int32_t>(swab32(static_cast<uint32_t>(x))); }
-template<> INLINE int64_t swab(int64_t x) { return static_cast<int64_t>(swab64(static_cast<uint64_t>(x))); }
+template<> INLINE uint16_t swab(uint16_t x) { return SWAB16(x); }
+template<> INLINE uint32_t swab(uint32_t x) { return SWAB32(x); }
+template<> INLINE uint64_t swab(uint64_t x) { return SWAB64(x); }
+template<> INLINE int16_t swab(int16_t x) { return static_cast<int16_t>(SWAB16(static_cast<uint16_t>(x))); }
+template<> INLINE int32_t swab(int32_t x) { return static_cast<int32_t>(SWAB32(static_cast<uint32_t>(x))); }
+template<> INLINE int64_t swab(int64_t x) { return static_cast<int64_t>(SWAB64(static_cast<uint64_t>(x))); }
template<> INLINE float swab(float x) { return swab_float(x); }
/// Type generic conversion from CPU byte order to big-endian byte order.
projects / bertos.git / blobdiff