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//! The logger used to store logs from the kernel. This accepts logs from the `log` crate, and
//! delivers them to console devices.
use core::fmt::{self, Write};
/// Initializes the logger. This should be called exactly once, early in boot.
pub fn init_early() {
log::set_logger(&Logger).expect("failed to set logger");
log::set_max_level(log::LevelFilter::Trace);
log::warn!("Using a bad unportable logger that only works on qemu-virt");
}
struct BadRiscvWrite;
impl Write for BadRiscvWrite {
fn write_str(&mut self, s: &str) -> fmt::Result {
let ptr = 0x10000000 as *mut u8;
for b in s.bytes() {
unsafe { ptr.write_volatile(b) };
}
Ok(())
}
}
pub struct Logger;
impl log::Log for Logger {
fn enabled(&self, _metadata: &log::Metadata) -> bool {
true
}
fn log(&self, record: &log::Record) {
if !self.enabled(record.metadata()) {
return;
}
let body = |line| {
let level = match record.level() {
log::Level::Error => "\x1b[1;31mERR\x1b[0m",
log::Level::Warn => "\x1b[1;33mWRN\x1b[0m",
log::Level::Info => "\x1b[1;36mINF\x1b[0m",
log::Level::Debug => "\x1b[1;35mDBG\x1b[0m",
log::Level::Trace => "TRC",
};
let file = record.file().unwrap_or("???");
let args = record.args();
let result = if args.as_str() == Some("") {
// A silly convenience, but don't write the extra space if we're
// not going to write anything anyways.
writeln!(BadRiscvWrite, "[{level}][{file}:{line}]")
} else {
writeln!(BadRiscvWrite, "[{level}][{file}:{line}] {args}")
};
// UNWRAP: Since the fmt::Write impl for ConsoleInner has a
// contract promising that it won't ever return an error, this
// should be unreachable.
result.unwrap();
};
// Some contortions to avoid running afoul of the lifetime requirements
// of format_args...
match record.line() {
Some(line) => body(format_args!("{line}")),
None => body(format_args!("???")),
}
}
fn flush(&self) {}
}
|
