tg-rcore-tutorial-user 0.4.10

User-space apps for rCore Tutorial chapters (subset for ch2).
Documentation 
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#![no_std]
#![no_main]

#[macro_use]
extern crate user_lib;

use user_lib::{mmap, munmap};

// 教学目标：
// 验证“先映射-局部解除映射-再映射”后的连续地址可读写正确性。

#[unsafe(no_mangle)]
extern "C" fn main() -> i32 {
    let start: usize = 0x10000000;
    let len: usize = 4096;
    let prot: usize = 3;
    assert_eq!(0, mmap(start, len, prot));
    assert_eq!(mmap(start + len, len * 2, prot), 0);
    assert_eq!(munmap(start, len), 0);
    assert_eq!(mmap(start - len, len + 1, prot), 0);
    for i in (start - len)..(start + len * 3) {
        let addr: *mut u8 = i as *mut u8;
        unsafe {
            *addr = i as u8;
        }
    }
    for i in (start - len)..(start + len * 3) {
        let addr: *mut u8 = i as *mut u8;
        unsafe {
            assert_eq!(*addr, i as u8);
        }
    }
    println!("Test 04_5 ummap OK!");
    0
}