source: mainline/uspace/app/lspci/libpci/sysdep.h@ 24f27bb

/*
 *      The PCI Library -- System-Dependent Stuff
 *
 *      Copyright (c) 1997--2004 Martin Mares <mj@ucw.cz>
 *
 *      May 8, 2006 - Modified and ported to HelenOS by Jakub Jermar.
 *
 *      Can be freely distributed and used under the terms of the GNU GPL.
 */

#ifdef __GNUC__
#define UNUSED __attribute__((unused))
#define NONRET __attribute__((noreturn))
#else
#define UNUSED
#define NONRET
#define inline
#endif

typedef u8 byte;
typedef u16 word;

static inline void swap(u8 *x, u8 *y)
{
        u8 z = *x;
        *x = *y;
        *y = z;
}

static inline u16 invert_endianess_16(u16 x) 
{
        u8 *px = (u8 *)&x;
        swap(&px[0], &px[1]);
        return x;
}

static inline u32 invert_endianess_32(u32 x) 
{
        u8 *px = (u8 *)&x;
        swap(&px[0], &px[3]);
        swap(&px[1], &px[2]);
        return x;
}

#ifdef UARCH_sparc64
        #define cpu_to_le16(x) (invert_endianess_16(x))
        #define cpu_to_le32(x) (invert_endianess_32(x))
        #define le16_to_cpu(x) (invert_endianess_16(x))
        #define le32_to_cpu(x) (invert_endianess_32(x))
#else
        #define cpu_to_le16(x) (x)
        #define cpu_to_le32(x) (x)
        #define le16_to_cpu(x) (x)
        #define le32_to_cpu(x) (x)
#endif