Virtqueue Available Ring. More...

#include <split.hpp>

Collaboration diagram for virtio::SplitVirtqueue::Avail:

Public Member Functions
auto	used_event (uint16_t queue_size) volatile -> volatile uint16_t *
	获取 used_event 字段的指针

auto	used_event (uint16_t queue_size) const volatile -> const volatile uint16_t *

Public Attributes
uint16_t	flags
	标志位: AvailFlags (little-endian)

uint16_t	idx
	驱动程序将下一个描述符条目放入环中的位置(模 queue_size) (little-endian)

uint16_t	ring []
	可用描述符头索引数组 ring[queue_size] (little-endian)

Static Public Attributes
static constexpr size_t	kAlign = 2
	Available Ring 对齐要求(字节)

Detailed Description

Virtqueue Available Ring.

Available Ring 用于驱动程序向设备提供缓冲区。驱动程序将描述符链的头部放入环中。

Note: 实际 ring[] 大小由 queue_size 决定; 2 字节对齐

See also: virtio-v1.2#2.7.6 The Virtqueue Available Ring

Definition at line 103 of file split.hpp.

Member Function Documentation

◆ used_event() [1/2]

auto virtio::SplitVirtqueue::Avail::used_event ( uint16_t queue_size ) const volatile -> const volatile uint16_t*

inline

Definition at line 128 of file split.hpp.

                           {
      return ring + queue_size;
    }

◆ used_event() [2/2]

auto virtio::SplitVirtqueue::Avail::used_event ( uint16_t queue_size ) volatile -> volatile uint16_t*

inline

获取 used_event 字段的指针

Parameters

queue_size 队列大小

Returns: used_event 字段指针

Note: 仅当协商 VIRTIO_F_EVENT_IDX 特性时使用

See also: virtio-v1.2#2.7.10 Available Buffer Notification Suppression

Definition at line 123 of file split.hpp.

                              {
      return ring + queue_size;
    }

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Member Data Documentation

◆ flags

uint16_t virtio::SplitVirtqueue::Avail::flags

标志位: AvailFlags (little-endian)

Definition at line 107 of file split.hpp.

◆ idx

uint16_t virtio::SplitVirtqueue::Avail::idx

驱动程序将下一个描述符条目放入环中的位置(模 queue_size) (little-endian)

Definition at line 109 of file split.hpp.

◆ kAlign

constexpr size_t virtio::SplitVirtqueue::Avail::kAlign = 2

staticconstexpr

Available Ring 对齐要求(字节)

Definition at line 105 of file split.hpp.

◆ ring

uint16_t virtio::SplitVirtqueue::Avail::ring[]

可用描述符头索引数组 ring[queue_size] (little-endian)

Definition at line 113 of file split.hpp.

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

/workspaces/SimpleKernel/src/device/virtio/virt_queue/split.hpp

Public Member Functions

Public Attributes

Static Public Attributes