fix ch3

Author: wyfcyx

os/src/boards/qemu.rs

@@ -0,0 +1,3 @@
+//! Constants used in rCore for qemu
+
+pub const CLOCK_FREQ: usize = 12500000;

os/src/main.rs

@@ -22,6 +22,10 @@
 #![feature(panic_info_message)]
 
 use core::arch::global_asm;
+
+#[path = "boards/qemu.rs"]
+mod board;
+
 #[macro_use]
 mod console;
 mod config;

os/src/sbi.rs

@@ -6,11 +6,9 @@ pub fn console_putchar(c: usize) {
     sbi_rt::legacy::console_putchar(c);
 }
 
-/// use sbi call to getchar from console (qemu uart handler)
-#[allow(unused)]
-pub fn console_getchar() -> usize {
-    #[allow(deprecated)]
-    sbi_rt::legacy::console_getchar()
+/// use sbi call to set timer
+pub fn set_timer(timer: usize) {
+    sbi_rt::set_timer(timer as _);
 }
 
 /// use sbi call to shutdown the kernel

os/src/task/mod.rs

@@ -17,6 +17,7 @@ mod task;
 
 use crate::config::MAX_APP_NUM;
 use crate::loader::{get_num_app, init_app_cx};
+use crate::sbi::shutdown;
 use crate::sync::UPSafeCell;
 use lazy_static::*;
 use switch::__switch;
@@ -134,8 +135,7 @@ impl TaskManager {
             // go back to user mode
         } else {
             println!("All applications completed!");
-            use crate::board::QEMUExit;
-            crate::board::QEMU_EXIT_HANDLE.exit_success();
+            shutdown(false);
         }
     }
 }