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90 lines
2.6 KiB
Rust
90 lines
2.6 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2022 Andre Richter <andre.o.richter@gmail.com>
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// Rust embedded logo for `make doc`.
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#![doc(
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html_logo_url = "https://raw.githubusercontent.com/rust-embedded/wg/master/assets/logo/ewg-logo-blue-white-on-transparent.png"
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)]
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//! The `kernel` binary.
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#![feature(format_args_nl)]
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#![no_main]
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#![no_std]
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use libkernel::{bsp, console, driver, exception, info, memory, time};
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/// Early init code.
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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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/// - MMU + Data caching must be activated at the earliest. Without it, any atomic operations,
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/// e.g. the yet-to-be-introduced spinlocks in the device drivers (which currently employ
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/// NullLocks instead of spinlocks), will fail to work (properly) on the RPi SoCs.
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#[no_mangle]
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unsafe fn kernel_init() -> ! {
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use driver::interface::DriverManager;
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use memory::mmu::interface::MMU;
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exception::handling_init();
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if let Err(string) = memory::mmu::mmu().enable_mmu_and_caching() {
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panic!("MMU: {}", string);
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}
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for i in bsp::driver::driver_manager().all_device_drivers().iter() {
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if let Err(x) = i.init() {
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panic!("Error loading driver: {}: {}", i.compatible(), x);
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}
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}
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bsp::driver::driver_manager().post_device_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 console::console;
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use driver::interface::DriverManager;
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info!("{}", libkernel::version());
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info!("Booting on: {}", bsp::board_name());
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info!("MMU online. Special regions:");
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bsp::memory::mmu::virt_mem_layout().print_layout();
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let (_, privilege_level) = exception::current_privilege_level();
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info!("Current privilege level: {}", privilege_level);
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info!("Exception handling state:");
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exception::asynchronous::print_state();
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info!(
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"Architectural timer resolution: {} ns",
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time::time_manager().resolution().as_nanos()
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);
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info!("Drivers loaded:");
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for (i, driver) in bsp::driver::driver_manager()
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.all_device_drivers()
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.iter()
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.enumerate()
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{
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info!(" {}. {}", i + 1, driver.compatible());
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}
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info!("Echoing input now");
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// Discard any spurious received characters before going into echo mode.
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console().clear_rx();
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loop {
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let c = console().read_char();
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console().write_char(c);
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}
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}
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