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112 lines
3.3 KiB
Rust
112 lines
3.3 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, cpu, driver, exception, info, memory, state, time, warn};
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/// Early init code.
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///
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/// When this code runs, virtual memory is already enabled.
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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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/// - Printing will not work until the respective driver's MMIO is remapped.
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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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exception::handling_init();
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memory::mmu::post_enable_init();
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// Add the mapping records for the precomputed entries first, so that they appear on the top of
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// the list.
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bsp::memory::mmu::kernel_add_mapping_records_for_precomputed();
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// Bring up the drivers needed for printing first.
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for i in bsp::driver::driver_manager()
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.early_print_device_drivers()
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.iter()
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{
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// Any encountered errors cannot be printed yet, obviously, so just safely park the CPU.
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i.init().unwrap_or_else(|_| cpu::wait_forever());
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}
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bsp::driver::driver_manager().post_early_print_device_driver_init();
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// Printing available from here on.
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// Now bring up the remaining drivers.
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for i in bsp::driver::driver_manager()
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.non_early_print_device_drivers()
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.iter()
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{
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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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// Let device drivers register and enable their handlers with the interrupt controller.
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for i in bsp::driver::driver_manager().all_device_drivers() {
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if let Err(msg) = i.register_and_enable_irq_handler() {
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warn!("Error registering IRQ handler: {}", msg);
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}
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}
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// Unmask interrupts on the boot CPU core.
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exception::asynchronous::local_irq_unmask();
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// Announce conclusion of the kernel_init() phase.
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state::state_manager().transition_to_single_core_main();
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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 driver::interface::DriverManager;
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use exception::asynchronous::interface::IRQManager;
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info!("{}", libkernel::version());
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info!("Booting on: {}", bsp::board_name());
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info!("MMU online:");
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memory::mmu::kernel_print_mappings();
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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!("Registered IRQ handlers:");
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bsp::exception::asynchronous::irq_manager().print_handler();
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info!("Echoing input now");
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cpu::wait_forever();
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}
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