i didn't know we can do this 


        // Access Permissions.
        desc += match attribute_fields.acc_perms {
            AccessPermissions::ReadOnly => STAGE1_PAGE_DESCRIPTOR::AP::RO_EL1,
            AccessPermissions::ReadWrite => STAGE1_PAGE_DESCRIPTOR::AP::RW_EL1,
        };

        // The execute-never attribute is mapped to PXN in AArch64.
        desc += if attribute_fields.execute_never {
            STAGE1_PAGE_DESCRIPTOR::PXN::True
        } else {
            STAGE1_PAGE_DESCRIPTOR::PXN::False
        };