CB_COLOR0_BASE
WREG32(CB_COLOR0_BASE, 0);
case CB_COLOR0_BASE:
tmp = (reg - CB_COLOR0_BASE) / 0x3c;
WREG32(CB_COLOR0_BASE, 0);
case CB_COLOR0_BASE:
tmp = (reg - CB_COLOR0_BASE) / 4;
WREG32(CB_COLOR0_BASE, 0);