HGA_STATUS_PORT
outb_p(0x00, HGA_STATUS_PORT);
outb_p(0x00, HGA_STATUS_PORT);
p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
switch (inb_p(HGA_STATUS_PORT) & 0x70) {