VGA_GR_PORT
outb(VGA_GR_PORT, 0x06);
outw(VGA_GR_PORT, 0x0f05); /* unlock registers */
outb(VGA_GR_PORT, 0x0b); /* disable linear addressing */
outb(VGA_GR_PORT, 0x0e); /* disable 256 color mode */
outb(VGA_GR_PORT, GR_regs[i].idx);
outb(VGA_GR_PORT + 1, GR_regs[i].val);