Inject the logger for Asterinas

kernel/comps/block/Cargo.toml

@@ -11,6 +11,7 @@ spin = "0.9.4"
 ostd = { path = "../../../ostd" }
 align_ext = { path = "../../../ostd/libs/align_ext" }
 aster-util = { path = "../../libs/aster-util" }
+aster-logger = { path = "../logger" }
 int-to-c-enum = { path = "../../libs/int-to-c-enum" }
 component = { path = "../../libs/comp-sys/component" }
 log = "0.4"

kernel/comps/framebuffer/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2021"
 [dependencies]
 ostd = { path = "../../../ostd" }
 component = { path = "../../libs/comp-sys/component" }
+aster-logger = { path = "../logger" }
 log = "0.4"
 spin = "0.9.4"
 font8x8 = { version = "0.2.5", default-features = false, features = [

kernel/comps/input/Cargo.toml

@@ -11,6 +11,7 @@ spin = "0.9.4"
 ostd = { path = "../../../ostd" }
 aster-util = { path = "../../libs/aster-util" }
 aster-rights = { path = "../../libs/aster-rights" }
+aster-logger = { path = "../logger" }
 component = { path = "../../libs/comp-sys/component" }
 int-to-c-enum = { path = "../../libs/int-to-c-enum" }
 log = "0.4"

kernel/comps/logger/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "aster-logger"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+component = { path = "../../libs/comp-sys/component" }
+aster-console = { path = "../console" }
+log = "0.4"
+ostd = { path = "../../../ostd" }
+spin = "0.9.4"
+owo-colors = { version = "3", optional = true }
+cfg-if = "1.0"
+
+[features]
+default = ["log_color"]
+log_color = ["dep:owo-colors"]

kernel/comps/logger/src/aster_logger.rs

@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use log::{Metadata, Record};
+use ostd::timer::Jiffies;
+
+/// The logger used for Asterinas.
+struct AsterLogger;
+
+static LOGGER: AsterLogger = AsterLogger;
+
+impl log::Log for AsterLogger {
+    fn enabled(&self, _metadata: &Metadata) -> bool {
+        true
+    }
+
+    fn log(&self, record: &Record) {
+        let timestamp = Jiffies::elapsed().as_duration().as_secs_f64();
+
+        // Use a global lock to prevent interleaving of log messages.
+        use ostd::sync::SpinLock;
+        static RECORD_LOCK: SpinLock<()> = SpinLock::new(());
+        let _lock = RECORD_LOCK.disable_irq().lock();
+
+        print_logs(record, timestamp);
+    }
+
+    fn flush(&self) {}
+}
+
+#[cfg(feature = "log_color")]
+fn print_logs(record: &Record, timestamp: f64) {
+    use owo_colors::Style;
+
+    let timestamp_style = Style::new().green();
+    let record_style = Style::new().default_color();
+    let level_style = match record.level() {
+        log::Level::Error => Style::new().red(),
+        log::Level::Warn => Style::new().bright_yellow(),
+        log::Level::Info => Style::new().blue(),
+        log::Level::Debug => Style::new().bright_green(),
+        log::Level::Trace => Style::new().bright_black(),
+    };
+
+    super::_print(format_args!(
+        "{} {:<5}: {}\n",
+        timestamp_style.style(format_args!("[{:>10.3}]", timestamp)),
+        level_style.style(record.level()),
+        record_style.style(record.args())
+    ));
+}
+
+#[cfg(not(feature = "log_color"))]
+fn print_logs(record: &Record, timestamp: f64) {
+    super::_print(format_args!(
+        "{} {:<5}: {}\n",
+        format_args!("[{:>10.3}]", timestamp),
+        record.level(),
+        record.args()
+    ));
+}
+
+pub(super) fn init() {
+    ostd::logger::inject_logger(&LOGGER);
+}

kernel/comps/logger/src/console.rs

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: MPL-2.0
+
+//! `print` and `println` macros
+//!
+//! FIXME: It will print to all `virtio-console` devices, which is not a good choice.
+//!
+
+use core::fmt::{Arguments, Write};
+
+struct VirtioConsolesPrinter;
+
+impl Write for VirtioConsolesPrinter {
+    fn write_str(&mut self, s: &str) -> core::fmt::Result {
+        for (_, device) in aster_console::all_devices() {
+            device.send(s.as_bytes());
+        }
+        Ok(())
+    }
+}
+
+/// Prints the formatted arguments to the standard output.
+pub fn _print(args: Arguments) {
+    VirtioConsolesPrinter.write_fmt(args).unwrap();
+}
+
+/// Copied from Rust std: <https://github.com/rust-lang/rust/blob/master/library/std/src/macros.rs>
+#[macro_export]
+macro_rules! print {
+    ($($arg:tt)*) => {{
+        $crate::_print(format_args!($($arg)*));
+    }};
+}
+
+/// Copied from Rust std: <https://github.com/rust-lang/rust/blob/master/library/std/src/macros.rs>
+#[macro_export]
+macro_rules! println {
+    () => {
+        $crate::print!("\n")
+    };
+    ($($arg:tt)*) => {{
+        $crate::_print(format_args_nl!($($arg)*));
+    }};
+}

kernel/comps/logger/src/lib.rs

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: MPL-2.0
+
+//! The logger implementation for Asterinas.
+//!
+//! This logger now has the most basic logging functionality, controls the output
+//! based on the globally set log level. Different log levels will be represented
+//! with different colors if enabling `log_color` feature.
+//!
+//! This logger guarantees _atomicity_ under concurrency: messages are always
+//! printed in their entirety without being mixed with messages generated
+//! concurrently on other cores.
+//!
+//! IRQs are disabled while printing. So do not print long log messages.
+#![no_std]
+#![deny(unsafe_code)]
+
+extern crate alloc;
+
+use component::{init_component, ComponentInitError};
+
+mod aster_logger;
+mod console;
+
+pub use console::_print;
+
+#[init_component]
+fn init() -> Result<(), ComponentInitError> {
+    aster_logger::init();
+    Ok(())
+}

kernel/comps/network/Cargo.toml

@@ -10,6 +10,7 @@ align_ext = { path = "../../../ostd/libs/align_ext" }
 aster-util = { path = "../../libs/aster-util" }
 aster-rights = { path = "../../libs/aster-rights" }
 aster-bigtcp = { path = "../../libs/aster-bigtcp" }
+aster-logger = { path = "../logger" }
 bitflags = "1.3"
 bitvec = { version = "1.0.1", default-features = false, features = ["alloc"] }
 component = { path = "../../libs/comp-sys/component" }

kernel/comps/softirq/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2021"
 [dependencies]
 ostd = { path = "../../../ostd" }
 component = { path = "../../libs/comp-sys/component" }
+aster-logger = { path = "../logger" }
 intrusive-collections = "0.9.5"
 spin = "0.9.4"
 

kernel/comps/time/Cargo.toml

@@ -9,6 +9,7 @@ edition = "2021"
 ostd = { path = "../../../ostd" }
 aster-util = { path = "../../libs/aster-util" }
 component = { path = "../../libs/comp-sys/component" }
+aster-logger = { path = "../logger" }
 log = "0.4"
 spin = "0.9.4"
 

kernel/comps/virtio/Cargo.toml

@@ -12,6 +12,7 @@ bytes = { version = "1.4.0", default-features = false }
 align_ext = { path = "../../../ostd/libs/align_ext" }
 aster-input = { path = "../input" }
 aster-block = { path = "../block" }
+aster-logger = { path = "../logger" }
 aster-network = { path = "../network" }
 aster-console = { path = "../console" }
 aster-util = { path = "../../libs/aster-util" }