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71 lines
1.6 KiB
71 lines
1.6 KiB
//! 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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//!
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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_first_task()`] 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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#![no_std]
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#![no_main]
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#![feature(panic_info_message)]
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use core::arch::global_asm;
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#[cfg(feature = "board_k210")]
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#[path = "boards/k210.rs"]
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mod board;
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#[cfg(not(any(feature = "board_k210")))]
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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 lang_items;
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mod loader;
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mod sbi;
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mod sync;
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pub mod syscall;
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pub mod task;
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mod timer;
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pub mod trap;
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global_asm!(include_str!("entry.asm"));
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global_asm!(include_str!("link_app.S"));
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/// clear BSS segment
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fn clear_bss() {
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extern "C" {
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fn sbss();
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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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#[no_mangle]
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pub fn rust_main() -> ! {
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clear_bss();
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println!("[kernel] Hello, world!");
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trap::init();
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loader::load_apps();
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trap::enable_timer_interrupt();
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timer::set_next_trigger();
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task::run_first_task();
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panic!("Unreachable in rust_main!");
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}
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