Method DescPhys

src/device/virtio/virt_queue/split.hpp:562–564

* @brief 获取描述符表的物理地址 * @see virtio-v1.2#2.7.5 */

   * @see virtio-v1.2#2.7.5
   */
  [[nodiscard]] auto DescPhys() const -> uint64_t {
    return phys_base_ + desc_offset_;
  }

  /**
   * @brief 获取 Available Ring 的物理地址