CXL_HDM_DECODER0_BASE_HIGH_OFFSET
writel(upper_32_bits(base), hdm + CXL_HDM_DECODER0_BASE_HIGH_OFFSET(id));
writel(0, hdm + CXL_HDM_DECODER0_BASE_HIGH_OFFSET(id));
hi = readl(hdm + CXL_HDM_DECODER0_BASE_HIGH_OFFSET(which));