linux/arch/x86/lib/io_64.c

#include <linux/string.h>
#include <asm/io.h>
#include <linux/module.h>

void __memcpy_toio(unsigned long dst,const void*src,unsigned len)
{
	__inline_memcpy((void *) dst,src,len);
}
EXPORT_SYMBOL(__memcpy_toio);

void __memcpy_fromio(void *dst,unsigned long src,unsigned len)
{
	__inline_memcpy(dst,(const void *) src,len);
}
EXPORT_SYMBOL(__memcpy_fromio);

void memset_io(volatile void __iomem *a, int b, size_t c)
{
	/* XXX: memset can mangle the IO patterns quite a bit.
	   perhaps it would be better to use a dumb one */
	memset((void *)a,b,c);
}
EXPORT_SYMBOL(memset_io);