#include <sys/types.h>

#include <machine/sysarch.h>

#include <err.h>

static inline uint8_t
inb(uint16_t port)
{
	uint8_t x;
	asm volatile("inb (%%dx),%%al"
	    : /*outputs*/"=a"(x)
	    : /*inputs*/"d"(port));
	return x;
}

static inline uint16_t
inw(uint16_t port)
{
	uint16_t x;
	asm volatile("inw (%%dx),%%ax"
	    : /*outputs*/"=a"(x)
	    : /*inputs*/"d"(port)
	    : /*clobber*/"memory");
	return x;
}

static inline uint32_t
inl(uint16_t port)
{
	uint32_t x;
	asm volatile("inl (%%dx),%%eax"
	    : /*outputs*/"=a"(x)
	    : /*inputs*/"d"(port)
	    : /*clobber*/"memory");
	return x;
}

static inline void
outb(uint16_t port, uint8_t x)
{
	asm volatile("outb %%al,(%%dx)"
	    : /*outputs*/
	    : /*inputs*/"a"(x), "d"(port)
	    : /*clobber*/"memory");
}

static inline void
outw(uint16_t port, uint16_t x)
{
	asm volatile("outw %%ax,(%%dx)"
	    : /*outputs*/
	    : /*inputs*/"a"(x), "d"(port)
	    : /*clobber*/"memory");
}

static inline void
outl(uint16_t port, uint32_t x)
{
	asm volatile("outl %%eax,(%%dx)"
	    : /*outputs*/
	    : /*inputs*/"a"(x), "d"(port)
	    : /*clobber*/"memory");
}

int
main(void)
{
	uint16_t tctl1;

	if (x86_64_iopl(1) == -1)
		err(1, "x86_64_iopl(1)");
	tctl1 = inw(0x400 + 0x8);
	outw(0x400 + 0x8, tctl1 | (1 << 8));
	outw(0x400 + 0x8, tctl1);
	if (x86_64_iopl(0) == -1)
		err(1, "x86_64_iopl(1)");
}