Little Endian vs Big Endian
Exemplos de arquiteturas e arquiteturas com mais de um endianness.

#include <asm/byteorder.h>
include/linux/byteorder/

From include/linux/bytorder/generic.h
 * Conversion of XX-bit integers (16- 32- or 64-)
 * between native CPU format and little/big endian format
 * 64-bit stuff only defined for proper architectures
 *      cpu_to_[bl]eXX(__uXX x)
 *      [bl]eXX_to_cpu(__uXX x)
 *
 * The same, but takes a pointer to the value to convert
 *      cpu_to_[bl]eXXp(__uXX x)
 *      [bl]eXX_to_cpup(__uXX x)
 *
 * The same, but change in situ
 *      cpu_to_[bl]eXXs(__uXX x)
 *      [bl]eXX_to_cpus(__uXX x)

TODO: alignment issues!?! from generic.h