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83 lines
2.5 KiB
Rust
83 lines
2.5 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};
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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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/// IRQSafeNullLocks 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 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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// Initialize the BSP driver subsystem.
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if let Err(x) = bsp::driver::init() {
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panic!("Error initializing BSP driver subsystem: {}", x);
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}
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// Initialize all device drivers.
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driver::driver_manager().init_drivers_and_irqs();
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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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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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driver::driver_manager().enumerate();
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info!("Registered IRQ handlers:");
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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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