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116 lines
3.3 KiB
Rust
116 lines
3.3 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 `relocate::relocate_self()`.
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mod relocate;
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// `relocate::relocate_self()` calls `runtime_init::init()`, which on completion, jumps to
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// `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 interface::console::All;
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println!(" __ __ _ _ _ _ ");
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println!("| \\/ (_)_ _ (_) | ___ __ _ __| |");
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println!("| |\\/| | | ' \\| | |__/ _ \\/ _` / _` |");
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println!("|_| |_|_|_||_|_|____\\___/\\__,_\\__,_|");
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println!();
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println!("{:^37}", bsp::board_name());
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println!();
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println!("[ML] Requesting binary");
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bsp::console().flush();
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// Clear the RX FIFOs, if any, of spurious received characters before starting with the loader
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// protocol.
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bsp::console().clear();
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// Notify raspbootcom to send the binary.
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for _ in 0..3 {
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bsp::console().write_char(3 as char);
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}
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// Read the binary's size.
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let mut size: u32 = u32::from(bsp::console().read_char() as u8);
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size |= u32::from(bsp::console().read_char() as u8) << 8;
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size |= u32::from(bsp::console().read_char() as u8) << 16;
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size |= u32::from(bsp::console().read_char() as u8) << 24;
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// Trust it's not too big.
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print!("OK");
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let kernel_addr: *mut u8 = bsp::BOARD_DEFAULT_LOAD_ADDRESS as *mut u8;
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unsafe {
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// Read the kernel byte by byte.
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for i in 0..size {
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*kernel_addr.offset(i as isize) = bsp::console().read_char() as u8;
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}
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}
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println!("[ML] Loaded! Executing the payload now\n");
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bsp::console().flush();
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// Use black magic to get a function pointer.
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let kernel: extern "C" fn() -> ! = unsafe { core::mem::transmute(kernel_addr as *const ()) };
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// Jump to loaded kernel!
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kernel()
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}
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