Try batch but kernel panicked.

os/src/batch.rs

@@ -0,0 +1,117 @@
+use core::cell::RefCell;
+use lazy_static::*;
+use crate::trap::TrapContext;
+
+const USER_STACK_SIZE: usize = 4096 * 2;
+const KERNEL_STACK_SIZE: usize = 4096 * 2;
+const MAX_APP_NUM: usize = 16;
+const APP_BASE_ADDRESS: usize = 0x80040000;
+const APP_SIZE_LIMIT: usize = 0x20000;
+
+#[repr(align(4096))]
+struct KernelStack {
+    data: [u8; KERNEL_STACK_SIZE],
+}
+
+#[repr(align(4096))]
+struct UserStack {
+    data: [u8; USER_STACK_SIZE],
+}
+
+static KERNEL_STACK: KernelStack = KernelStack { data: [0; KERNEL_STACK_SIZE] };
+static USER_STACK: UserStack = UserStack { data: [0; USER_STACK_SIZE] };
+
+impl KernelStack {
+    fn get_sp(&self) -> usize {
+        self.data.as_ptr() as usize + KERNEL_STACK_SIZE
+    }
+    pub fn push_context(&self, cx: TrapContext) -> &'static mut TrapContext {
+        let cx_ptr = (self.get_sp() - core::mem::size_of::<TrapContext>()) as *mut TrapContext;
+        unsafe { *cx_ptr = cx; }
+        unsafe { cx_ptr.as_mut().unwrap() }
+    }
+}
+
+impl UserStack {
+    fn get_sp(&self) -> usize {
+        self.data.as_ptr() as usize + USER_STACK_SIZE
+    }
+}
+
+struct AppManager {
+    inner: RefCell<AppManagerInner>,
+}
+struct AppManagerInner {
+    num_app: usize,
+    next_app: usize,
+    app_start: [usize; MAX_APP_NUM + 1],
+}
+unsafe impl Sync for AppManager {}
+
+impl AppManagerInner {
+    pub fn print_app_info(&self) {
+        println!("num_app = {}", self.num_app);
+        for i in 0..self.num_app {
+            println!("app_{} [{:#x}, {:#x})", i, self.app_start[i], self.app_start[i + 1]);
+        }
+    }
+
+    unsafe fn load_app(&self, app_id: usize) {
+        // clear app area
+        (APP_BASE_ADDRESS..APP_BASE_ADDRESS + APP_SIZE_LIMIT).for_each(|addr| {
+            (addr as *mut u8).write_volatile(0);
+        });
+        let app_src = core::slice::from_raw_parts(
+            self.app_start[app_id] as *const u8,
+            self.app_start[app_id + 1] - self.app_start[app_id]
+        );
+        let app_dst = core::slice::from_raw_parts_mut(
+            APP_BASE_ADDRESS as *mut u8,
+            app_src.len()
+        );
+        app_dst.copy_from_slice(app_src);
+    }
+
+    pub fn run_next_app(&mut self) {
+        unsafe { self.load_app(self.next_app); }
+        self.next_app += 1;
+        extern "C" { fn __restore(cx: &mut TrapContext); }
+        unsafe {
+            __restore(KERNEL_STACK.push_context(
+                TrapContext::app_init_context(APP_BASE_ADDRESS, USER_STACK.get_sp())
+            ));
+        }
+    }
+}
+
+lazy_static! {
+    static ref APP_MANAGER: AppManager = AppManager {
+        inner: RefCell::new({
+            extern "C" { fn _num_app(); }
+            let num_app_ptr = _num_app as usize as *const usize;
+            let num_app = unsafe { num_app_ptr.read_volatile() };
+            let mut app_start: [usize; MAX_APP_NUM + 1] = [0; MAX_APP_NUM + 1];
+            let app_start_raw: &[usize] = unsafe {
+                core::slice::from_raw_parts(num_app_ptr.add(1), num_app + 1)
+            };
+            &app_start[..=num_app].copy_from_slice(app_start_raw);
+            AppManagerInner {
+                num_app,
+                next_app: 0,
+                app_start,
+            }
+        }),
+    };
+}
+
+pub fn init() {
+    print_app_info();
+}
+
+pub fn print_app_info() {
+    APP_MANAGER.inner.borrow().print_app_info();
+}
+
+pub fn run_next_app() {
+    APP_MANAGER.inner.borrow_mut().run_next_app();
+}