rCore_stu/ch1/src/main.rs

#![feature(panic_info_message)]
#![no_std]
#![no_main]

use core::arch::global_asm;
use sbi::{console_put_char, shutdown};
use lang_items::console;

mod lang_items;
mod sbi;

// 汇编脚本引入, 调整内核的内存布局之后, 会跳入到 rust_main中执行
global_asm!(include_str!("entry.asm"));


#[no_mangle]
pub fn rust_main(){
    init_bss();
    println!("hello world");

    let mut a = 123;
    a = 234;
    a = 345;
    println!("hello world {:?}", a);

    panic!("my panic");
}

/// ## 初始化bss段
///
fn init_bss() {
    extern "C" {
        static mut sbss: u64;
        static mut ebss: u64;
    }
    unsafe {
        (sbss..ebss).for_each(|p| (p as *mut u8).write_unaligned(0))
    }
}