83 lines
1.9 KiB
Rust
83 lines
1.9 KiB
Rust
//! The main module and entrypoint
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//!
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//! Various facilities of the kernels are implemented as submodules. The most
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//! important ones are:
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//!
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//! - [`trap`]: Handles all cases of switching from userspace to the kernel
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//! - [`task`]: Task management
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//! - [`syscall`]: System call handling and implementation
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//! - [`mm`]: Address map using SV39
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//! - [`sync`]: Wrap a static data structure inside it so that we are able to access it without any `unsafe`.
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//! - [`fs`]: Separate user from file system with some structures
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//!
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//! The operating system also starts in this module. Kernel code starts
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//! executing from `entry.asm`, after which [`rust_main()`] is called to
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//! initialize various pieces of functionality. (See its source code for
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//! details.)
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//!
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//! We then call [`task::run_tasks()`] and for the first time go to
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//! userspace.
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#![deny(missing_docs)]
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#![deny(warnings)]
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#![allow(unused_imports)]
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#![no_std]
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#![no_main]
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#![feature(alloc_error_handler)]
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extern crate alloc;
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#[macro_use]
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extern crate bitflags;
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use log::*;
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#[path = "boards/qemu.rs"]
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mod board;
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#[macro_use]
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mod console;
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mod config;
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mod drivers;
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pub mod fs;
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pub mod lang_items;
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mod logging;
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pub mod mm;
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pub mod sbi;
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pub mod sync;
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pub mod syscall;
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pub mod task;
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pub mod timer;
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pub mod trap;
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use core::arch::global_asm;
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global_asm!(include_str!("entry.asm"));
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/// clear BSS segment
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fn clear_bss() {
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unsafe extern "C" {
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safe fn sbss();
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safe fn ebss();
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}
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unsafe {
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core::slice::from_raw_parts_mut(sbss as usize as *mut u8, ebss as usize - sbss as usize)
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.fill(0);
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}
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}
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/// the rust entry-point of os
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#[unsafe(no_mangle)]
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pub fn rust_main() -> ! {
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clear_bss();
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logging::init();
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info!("[kernel] Hello, world!");
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mm::init();
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mm::remap_test();
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trap::init();
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trap::enable_timer_interrupt();
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timer::set_next_trigger();
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fs::list_apps();
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task::add_initproc();
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task::run_tasks();
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panic!("Unreachable in rust_main!");
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}
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