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87 lines
2.3 KiB
Rust
87 lines
2.3 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2019 Andre Richter <andre.o.richter@gmail.com>
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// Rust embedded logo for `make doc`.
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#![doc(html_logo_url = "https://git.io/JeGIp")]
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//! The `kernel`
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//!
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//! The `kernel` is composed by glueing together code from
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//!
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//! - [Hardware-specific Board Support Packages] (`BSPs`).
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//! - [Architecture-specific code].
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//! - HW- and architecture-agnostic `kernel` code.
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//!
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//! using the [`kernel::interface`] traits.
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//!
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//! [Hardware-specific Board Support Packages]: bsp/index.html
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//! [Architecture-specific code]: arch/index.html
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//! [`kernel::interface`]: interface/index.html
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#![feature(format_args_nl)]
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#![feature(panic_info_message)]
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#![feature(trait_alias)]
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#![no_main]
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#![no_std]
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// Conditionally includes the selected `architecture` code, which provides the `_start()` function,
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// the first function to run.
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mod arch;
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// `_start()` then calls `runtime_init::init()`, which on completion, jumps to `kernel_init()`.
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mod runtime_init;
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// Conditionally includes the selected `BSP` code.
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mod bsp;
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mod interface;
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mod panic_wait;
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mod print;
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/// Early init code.
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///
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/// Concerned with with initializing `BSP` and `arch` parts.
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///
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/// # Safety
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///
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/// - Only a single core must be active and running this function.
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/// - The init calls in this function must appear in the correct order.
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unsafe fn kernel_init() -> ! {
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for i in bsp::device_drivers().iter() {
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if let Err(()) = i.init() {
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panic!("Error loading driver: {}", i.compatible())
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}
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}
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bsp::post_driver_init();
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// println! is usable from here on.
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// Transition from unsafe to safe.
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kernel_main()
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}
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/// The main function running after the early init.
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fn kernel_main() -> ! {
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use core::time::Duration;
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use interface::time::Timer;
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info!("Booting on: {}", bsp::board_name());
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info!(
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"Architectural timer resolution: {} ns",
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arch::timer().resolution().as_nanos()
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);
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info!("Drivers loaded:");
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for (i, driver) in bsp::device_drivers().iter().enumerate() {
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info!(" {}. {}", i + 1, driver.compatible());
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}
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// Test a failing timer case.
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arch::timer().spin_for(Duration::from_nanos(1));
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loop {
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info!("Spinning for 1 second");
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arch::timer().spin_for(Duration::from_secs(1));
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}
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}
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