coreboot-kgpe-d16/util/romcc/tests/simple_test37.c

static void main(void)
{
	unsigned csbase, csmask;

	csbase = 0x40;
	csmask = 0xfe00;
	
	__builtin_outl(csbase, 0x40);
	__builtin_outl(csmask, 0x60);
}