HGA_VALUE_PORT
outb_p(val, HGA_VALUE_PORT);
outb_p(reg, HGA_INDEX_PORT); outb_p(val >> 8, HGA_VALUE_PORT);
outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT);
outb (val, HGA_VALUE_PORT);
udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);