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pico_port.h
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pico_port.h
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#ifndef PICO_PORT_INCLUDED
#define PICO_PORT_INCLUDED
// provide size_t, uintptr_t
#include <stdlib.h>
#if !(defined(_MSC_VER) && _MSC_VER < 1800)
#include <stdint.h>
#endif
#include "pico_types.h"
#if defined(__GNUC__) && defined(__i386__)
#define REGPARM(x) __attribute__((regparm(x)))
#else
#define REGPARM(x)
#endif
#ifdef __GNUC__
#define NOINLINE __attribute__((noinline))
#define ALIGNED(n) __attribute__((aligned(n)))
#define unlikely(x) __builtin_expect((x), 0)
#define likely(x) __builtin_expect(!!(x), 1)
#else
#define NOINLINE
#define ALIGNED(n)
#define unlikely(x) (x)
#define likely(x) (x)
#endif
#ifdef _MSC_VER
#define snprintf _snprintf
#define strcasecmp _stricmp
#define strncasecmp _strnicmp
#define strdup _strdup
#endif
// There's no standard way to determine endianess at compile time. Try using
// some well known non-standard macros for detection.
#if defined __BYTE_ORDER__
#define CPU_IS_LE __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#elif defined _BYTE_ORDER
#define CPU_IS_LE __BYTE_ORDER == __LITTLE_ENDIAN
#elif defined __BIG_ENDIAN__ || defined _M_PPC // Windows on PPC was big endian
#define CPU_IS_LE 0
#elif defined __LITTLE_ENDIAN__ || defined _WIN32 // all other Windows is LE
#define CPU_IS_LE 1
#else
#warning "can't detect byte order, assume little endian"
#define CPU_IS_LE 1
#endif
// NB mixed endian integer platforms are not supported.
#if CPU_IS_LE
// address/offset operations
#define MEM_BE2(a) ((a)^1) // addr/offs of u8 in u16, or u16 in u32
#define MEM_BE4(a) ((a)^3) // addr/offs of u8 in u32
#define MEM_LE2(a) (a)
#define MEM_LE4(a) (a)
// swapping
#define CPU_BE2(v) ((u32)((u64)(v)<<16)|((u32)(v)>>16))
#define CPU_BE4(v) (((u32)(v)>>24)|(((v)>>8)&0x00ff00)| \
(((v)<<8)&0xff0000)|(u32)((v)<<24))
#define CPU_LE2(v) (v) // swap of 2*u16 in u32
#define CPU_LE4(v) (v) // swap of 4*u8 in u32
#else
// address/offset operations
#define MEM_BE2(a) (a)
#define MEM_BE4(a) (a)
#define MEM_LE2(a) ((a)^1)
#define MEM_LE4(a) ((a)^3)
// swapping
#define CPU_BE2(v) (v)
#define CPU_BE4(v) (v)
#define CPU_LE2(v) ((u32)((u64)(v)<<16)|((u32)(v)>>16))
#define CPU_LE4(v) (((u32)(v)>>24)|(((v)>>8)&0x00ff00)| \
(((v)<<8)&0xff0000)|(u32)((v)<<24))
#endif
#endif // PICO_PORT_INCLUDED