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/* ----------------------------------------------------------------------- *
*
* Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
#ifndef SYSLXINT_H
#define SYSLXINT_H
#include "syslinux.h"
/*
* Access functions for littleendian numbers, possibly misaligned.
*/
static inline uint8_t get_8(const unsigned char *p)
{
return *(const uint8_t *)p;
}
static inline uint16_t get_16(const unsigned char *p)
{
#if defined(__i386__) || defined(__x86_64__)
/* Littleendian and unaligned-capable */
return *(const uint16_t *)p;
#else
return (uint16_t) p[0] + ((uint16_t) p[1] << 8);
#endif
}
static inline uint32_t get_32(const unsigned char *p)
{
#if defined(__i386__) || defined(__x86_64__)
/* Littleendian and unaligned-capable */
return *(const uint32_t *)p;
#else
return (uint32_t) p[0] + ((uint32_t) p[1] << 8) +
((uint32_t) p[2] << 16) + ((uint32_t) p[3] << 24);
#endif
}
static inline void set_16(unsigned char *p, uint16_t v)
{
#if defined(__i386__) || defined(__x86_64__)
/* Littleendian and unaligned-capable */
*(uint16_t *) p = v;
#else
p[0] = (v & 0xff);
p[1] = ((v >> 8) & 0xff);
#endif
}
static inline void set_32(unsigned char *p, uint32_t v)
{
#if defined(__i386__) || defined(__x86_64__)
/* Littleendian and unaligned-capable */
*(uint32_t *) p = v;
#else
p[0] = (v & 0xff);
p[1] = ((v >> 8) & 0xff);
p[2] = ((v >> 16) & 0xff);
p[3] = ((v >> 24) & 0xff);
#endif
}
#define SECTOR_SHIFT 9 /* 512-byte sectors */
#define SECTOR_SIZE (1 << SECTOR_SHIFT)
#endif /* SYSLXINT_H */
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