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;

const SIZE: usize = 10;
const P: u32 = 3;
const STEP: usize = 100000;
const MOD: u32 = 10007;

// 教学目标：
// 通过纯计算负载 + 周期性输出，验证用户态计算与系统调用输出的稳定性。

#[unsafe(no_mangle)]
extern "C" fn main() -> i32 {
    let mut pow = [0u32; SIZE];
    let mut index: usize = 0;
    pow[index] = 1;
    for i in 1..=STEP {
        let last = pow[index];
        index = (index + 1) % SIZE;
        pow[index] = last * P % MOD;
        if i % 10000 == 0 {
            println!("{}^{}={}(MOD {})", P, i, pow[index], MOD);
        }
    }
    println!("Test power OK!");
    0
}