160 lines
4.1 KiB
Rust
160 lines
4.1 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
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//! TTY devices.
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//!
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//! This module implements TTY devices such as `/dev/tty0`, `/dev/tty`, and `/dev/console`.
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//!
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//! Reference: <https://www.kernel.org/doc/html/latest/admin-guide/devices.html>
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use aster_cmdline::KCMDLINE;
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use device_id::{DeviceId, MajorId, MinorId};
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use spin::Once;
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use super::vt::active_vt;
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use crate::{
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device::{
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registry::char,
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tty::{Tty, TtyFile, hvc::hvc0_device, serial::serial0_device, vt::VtDriver},
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},
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fs::{
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device::{Device, DeviceType},
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inode_handle::FileIo,
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},
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prelude::*,
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process::{JobControl, Terminal},
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};
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/// Corresponds to `/dev/tty0` in the file system. This device represents the active virtual
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/// terminal.
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pub struct Tty0Device;
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impl Tty0Device {
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fn active_vt(&self) -> Arc<Tty<VtDriver>> {
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active_vt()
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}
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}
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impl Device for Tty0Device {
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fn type_(&self) -> DeviceType {
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DeviceType::Char
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}
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fn id(&self) -> DeviceId {
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DeviceId::new(MajorId::new(4), MinorId::new(0))
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}
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fn devtmpfs_path(&self) -> Option<String> {
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Some("tty0".into())
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}
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fn open(&self) -> Result<Box<dyn FileIo>> {
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Ok(Box::new(TtyFile(self.active_vt())))
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}
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}
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impl Terminal for Tty0Device {
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fn job_control(&self) -> Arc<JobControl> {
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self.active_vt().job_control()
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}
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}
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/// Corresponds to `/dev/tty` in the file system. This device represents the controlling terminal
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/// of the session of the current process.
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pub struct TtyDevice;
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impl Device for TtyDevice {
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fn type_(&self) -> DeviceType {
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DeviceType::Char
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}
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fn id(&self) -> DeviceId {
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DeviceId::new(MajorId::new(5), MinorId::new(0))
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}
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fn devtmpfs_path(&self) -> Option<String> {
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Some("tty".into())
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}
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fn open(&self) -> Result<Box<dyn FileIo>> {
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let Some(terminal) = current!().terminal() else {
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return_errno_with_message!(
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Errno::ENOTTY,
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"the process does not have a controlling terminal"
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);
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};
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terminal.open()
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}
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}
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/// Corresponds to `/dev/console` in the file system. This device represents a console to which
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/// system messages will be sent.
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pub struct SystemConsole {
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inner: Arc<dyn Terminal>,
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}
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impl SystemConsole {
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/// Returns the singleton instance of the console device.
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pub fn singleton() -> &'static Arc<SystemConsole> {
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static INSTANCE: Once<Arc<SystemConsole>> = Once::new();
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INSTANCE.call_once(|| {
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// TODO: Support specifying multiple TTY devices, e.g., "console=hvc0 console=tty0".
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let console_name = KCMDLINE
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.get()
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.unwrap()
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.get_console_names()
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.first()
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.map(String::as_str)
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.unwrap_or("tty0");
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let device = match console_name {
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"tty0" => Some(Arc::new(Tty0Device) as _),
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"ttyS0" => serial0_device().cloned().map(|device| device as _),
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"hvc0" => hvc0_device().cloned().map(|device| device as _),
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_ => None,
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};
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let inner = device.unwrap_or_else(|| {
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warn!(
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"'{}' console not found, falling back to 'tty0'",
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console_name
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);
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Arc::new(Tty0Device) as _
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});
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Arc::new(Self { inner })
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})
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}
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/// Returns the terminal associated with the console device.
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pub fn terminal(&self) -> &Arc<dyn Terminal> {
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&self.inner
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}
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}
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impl Device for SystemConsole {
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fn type_(&self) -> DeviceType {
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DeviceType::Char
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}
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fn id(&self) -> DeviceId {
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DeviceId::new(MajorId::new(5), MinorId::new(1))
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}
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fn devtmpfs_path(&self) -> Option<String> {
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Some("console".into())
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}
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fn open(&self) -> Result<Box<dyn FileIo>> {
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self.inner.open()
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}
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}
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pub(super) fn init_in_first_process() -> Result<()> {
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char::register(Arc::new(Tty0Device))?;
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char::register(Arc::new(TtyDevice))?;
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char::register(SystemConsole::singleton().clone())?;
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Ok(())
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}
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