queryVariableInfo

    pub fn queryVariableInfo(
        self: *const RuntimeServices,
        // Note: .append_write is ignored
        attributes: VariableAttributes,
    ) QueryVariableInfoError!VariableInfo {
        var res: VariableInfo = undefined;

        switch (self._queryVariableInfo(
            attributes,
            &res.max_variable_storage_size,
            &res.remaining_variable_storage_size,
            &res.max_variable_size,
        )) {
            .success => return res,
            .invalid_parameter => return error.InvalidParameter,
            .unsupported => return error.Unsupported,
            else => |status| return uefi.unexpectedStatus(status),
        }
    }