M_RAMDAC_BASE
#define M_DAC_REG (M_RAMDAC_BASE+0)
#define M_DAC_VAL (M_RAMDAC_BASE+1)
#define M_PALETTE_MASK (M_RAMDAC_BASE+2)
mga_outb(M_RAMDAC_BASE+M_X_INDEX, reg);
return mga_inb(M_RAMDAC_BASE+M_X_DATAREG);
mga_outb(M_RAMDAC_BASE+M_X_INDEX, reg);
mga_outb(M_RAMDAC_BASE+M_X_DATAREG, val);