akern-gkgoat-fork/ableos/src/virtio/mod.rs

95 lines
2.5 KiB
Rust

//! virtio device
//!
//! This module contains the virtio device structural code.
//!
//! # Notes
//! <https://docs.oasis-open.org/virtio/virtio/v1.1/csprd01/virtio-v1.1-csprd01.html#x1-20001>
pub struct VirtioDevice {
_status: VirtioDeviceStatus,
}
use crate::devices::pci::PciDeviceInfo;
pub fn device_handler(device: PciDeviceInfo) {
use crate::devices::pci::PciClass::*;
match device.class() {
// Unclassified => todo!(),
// MassStorage => todo!(),
// Network => todo!(),
Display => {
trace!("Display found");
println!("{}", device.interrupt_pin());
}
// Multimedia => todo!(),
// Memory => todo!(),
// Bridge => todo!(),
// Other => todo!(),
_ => {}
}
}
#[repr(C)]
pub enum VirtioDeviceStatus {
// Indicates that the guest OS has found the device and recognized it as a valid virtio device.
Acknowleged = 1,
// Indicates that the guest OS knows how to drive the device. Note: There could be a significant (or infinite) delay before setting this bit. For example, under Linux, drivers can be loadable modules.
Driver = 2,
// Indicates that the driver has acknowledged all the features it understands, and feature negotiation is complete.
FeaturesOk = 8,
// Indicates that the device is set up and ready to drive the device.
DriverOk = 4,
// Indicates that the device needs to be reset.
DeviceNeedsReset = 64,
// Indicates that the device has failed.
Failed = 128,
}
pub struct FeaturesBits(u64);
impl FeaturesBits {
// bit mask the first 23 bits and return a u64
// 0 to 23
// Feature bits for the specific device type
pub fn device_type_features(&self) -> u64 {
0
}
// bit mask the 24th bit to the 37th bit and return a u64
// 24 to 37
// Feature bits reserved for extensions to the queue and feature negotiation mechanisms
pub fn extension_features(&self) -> u64 {
0
}
// bit mask the 38th bit to the 63th bit and return a u64
// 38 and above
// Feature bits reserved for future extensions.
pub fn future_features(&self) -> u64 {
0
}
}
// configuration change notification
// available buffer notification
// used buffer notification.
#[repr(C)]
pub struct VirtioDeviceNotification {
pub type_: u32,
pub index: u32,
pub value: u32,
}
pub struct Vring {
pub addr: u64,
pub len: u32,
pub flags: u16,
pub next: u16,
}
pub struct VringAvail {
pub flags: u16,
pub idx: u16,
pub ring: [u16; 0xFFFF],
}