virtio::Transport Class Reference

Virtio 传输层基类（零虚表开销，C++23 Deducing this） More...

#include <transport.hpp>

Inheritance diagram for virtio::Transport:

Collaboration diagram for virtio::Transport:

Public Types
enum class	DeviceStatus : uint32_t {   kReset = 0 , kAcknowledge = 1 , kDriver = 2 , kDriverOk = 4 ,   kFeaturesOk = 8 , kDeviceNeedsReset = 64 , kFailed = 128 }
	设备状态位定义 More...

Public Member Functions
auto	Reset (this auto &&self) -> void
	重置设备
auto	NeedsReset (this auto const &self) -> bool
	检查设备是否需要重置
auto	IsActive (this auto const &self) -> bool
	检查设备是否已激活（DRIVER_OK 已设置）
auto	AcknowledgeInterrupt (this auto &&self) -> void
	确认并清除设备中断

Protected Member Functions
构造/析构函数（仅允许派生类使用）
	Transport ()=default
	~Transport ()=default
	Transport (Transport &&) noexcept=default
auto	operator= (Transport &&) noexcept -> Transport &=default
	Transport (const Transport &)=delete
auto	operator= (const Transport &) -> Transport &=delete

Detailed Description

Virtio 传输层基类（零虚表开销，C++23 Deducing this）

利用 C++23 Deducing this（显式对象参数，P0847）实现编译期多态， 消除虚表指针开销和 CRTP static_cast 样板代码，实现零开销抽象。 子类（MmioTransport、PciTransport）继承此基类并提供具体的寄存器访问实现。

基类仅提供通用逻辑方法（Reset、NeedsReset、IsActive、AcknowledgeInterrupt）， 通过 Deducing this 在编译期静态分发到子类的具体实现。

子类应满足 TransportConcept 约束。

See also

TransportConcept

virtio-v1.2#4 Virtio Transport Options

Definition at line 83 of file transport.hpp.

Member Enumeration Documentation

DeviceStatus

enum class virtio::Transport::DeviceStatus : uint32_t

strong

设备状态位定义

See also

virtio-v1.2#2.1 Device Status Field

Enumerator
kReset	重置状态，驱动程序将此写入以重置设备
kAcknowledge	表示客户操作系统已找到设备并识别为有效的 virtio 设备
kDriver	表示客户操作系统知道如何驱动该设备
kDriverOk	表示驱动程序已准备好驱动设备（特性协商完成）
kFeaturesOk	表示驱动程序已确认设备提供的所有功能
kDeviceNeedsReset	表示设备需要重置
kFailed	表示在客户机中出现问题，已放弃该设备

Definition at line 89 of file transport.hpp.

                          : uint32_t {
    kReset = 0,
    kAcknowledge = 1,
    kDriver = 2,
    kDriverOk = 4,
    kFeaturesOk = 8,
    kDeviceNeedsReset = 64,
    kFailed = 128,
  };

Constructor & Destructor Documentation

Transport() [1/3]

virtio::Transport::Transport ( )

protecteddefault

~Transport()

virtio::Transport::~Transport ( )

protecteddefault

Transport() [2/3]

virtio::Transport::Transport ( Transport &&  )

protecteddefaultnoexcept

Transport() [3/3]

virtio::Transport::Transport ( const Transport &  )

protecteddelete

Member Function Documentation

AcknowledgeInterrupt()

auto virtio::Transport::AcknowledgeInterrupt ( this auto &&  self ) -> void

inline

确认并清除设备中断

See also

virtio-v1.2#2.3 Notifications

Definition at line 137 of file transport.hpp.

                                                      {
    auto status = self.GetInterruptStatus();
    if (status != 0) {
      self.AckInterrupt(status);
    }
  }

IsActive()

auto virtio::Transport::IsActive ( this auto const &  self ) -> bool

inline

检查设备是否已激活（DRIVER_OK 已设置）

Definition at line 128 of file transport.hpp.

                                                             {
    return (self.GetStatus() & std::to_underlying(DeviceStatus::kDriverOk)) !=
           0;
  }

NeedsReset()

auto virtio::Transport::NeedsReset ( this auto const &  self ) -> bool

inline

检查设备是否需要重置

Returns

true 表示设备需要重置

See also

virtio-v1.2#2.1 Device Status Field

Definition at line 120 of file transport.hpp.

                                                               {
    return (self.GetStatus() &
            std::to_underlying(DeviceStatus::kDeviceNeedsReset)) != 0;
  }

operator=() [1/2]

auto virtio::Transport::operator= ( const Transport &  ) -> Transport &=delete

protecteddelete

operator=() [2/2]

auto virtio::Transport::operator= ( Transport &&  ) -> Transport &=default

protecteddefaultnoexcept

Reset()

auto virtio::Transport::Reset ( this auto &&  self ) -> void

inline

重置设备

See also

virtio-v1.2#2.1 Device Status Field

Definition at line 110 of file transport.hpp.

                                       {
    self.SetStatus(std::to_underlying(DeviceStatus::kReset));
  }

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The documentation for this class was generated from the following file:

• /workspaces/SimpleKernel/src/device/virtio/transport/transport.hpp