modification for pull request

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "user"]
     path = user
-    url = https://github.com/ssryps/rcore-user.git
+    url = https://github.com/rCore/rcore-user.git
 [submodule "rboot"]
 	path = rboot
 	url = https://github.com/rcore-os/rboot.git

kernel/run.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-#make run net=on arch=x86_64 mode=release
-make run arch=x86_64 mode=release LOG=info net=on

kernel/src/arch/mipsel/interrupt.rs

@@ -119,7 +119,7 @@ fn external() {
 
 fn try_process_serial() -> bool {
     match super::io::getchar_option() {
-        Some(ch) => {is
+        Some(ch) => {
             trace!("Get char {} from serial", ch);
             crate::trap::serial(ch);
             true

labs/lab1/sleep.rs

@@ -1,75 +0,0 @@
-
-#![no_std]
-#![no_main]
-#![feature(alloc)]
-
-extern crate alloc;
-#[macro_use]
-extern crate rcore_user;
-
-
-
-use alloc::vec::Vec;
-use core::ptr;
-
-use rcore_user::io::get_line;
-
-
-use rcore_user::syscall::{sys_sleep, sys_vfork, sys_wait, sys_get_time, sys_exit};
-
-
-pub fn sleep(time: usize) -> i32 {
-    sys_sleep(time)
-}
-
-pub fn gettime_msec() -> u32{
-    sys_get_time() as u32
-}
-
-pub fn fork() -> i32 {
-    sys_vfork()
-}
-
-pub fn waitpid(pid: usize, code: *mut i32) -> i32 {
-    sys_wait(pid, code)
-}
-
-pub fn exit(error_code: usize) {
-    sys_exit(error_code);
-    println!("BUG: exit failed.");
-    while true {};
-}
-
-
-
-fn sleepy(pid: usize) {
-    let time: usize = 1;
-    for i in 0..10 {
-        sleep(time);
-        println!("sleep {} x {} slices.", i + 1, time);
-    }
-    exit(0);
-}
-
-
-// IMPORTANT: Must define main() like this
-#[no_mangle]
-pub fn main(){
-    let time = gettime_msec();
-    let mut pid1: usize = 0;
-    let mut exit_code = 0;
-
-    pid1 = fork() as usize;
-
-    if pid1 == 0 {
-        sleepy(pid1);
-    } else {
-        println!("child id is {}", pid1);
-    }
-
-    assert_eq!(waitpid(pid1, &mut exit_code), pid1 as i32);
-    assert_eq!(exit_code, 0);
-
-    println!("use {} msecs: {} to {}.", gettime_msec() - time, time, gettime_msec());
-    println!("sleep pass.");
-}