Add boards/ && cargo clippy&fmt

os/Cargo.toml

@@ -9,6 +9,7 @@ edition = "2018"
 [dependencies]
 riscv = { git = "https://github.com/rcore-os/riscv", features = ["inline-asm"] }
 lazy_static = { version = "1.4.0", features = ["spin_no_std"] }
+cfg-if = { version = "1.0.0" }
 
 [features]
 board_qemu = []

os/src/boards/k210.rs

@@ -0,0 +1 @@
+pub const CLOCK_FREQ: usize = 403000000 / 62;

os/src/boards/qemu.rs

@@ -0,0 +1 @@
+pub const CLOCK_FREQ: usize = 12500000;

os/src/config.rs

@@ -4,8 +4,11 @@ pub const MAX_APP_NUM: usize = 4;
 pub const APP_BASE_ADDRESS: usize = 0x80400000;
 pub const APP_SIZE_LIMIT: usize = 0x20000;
 
+/*
 #[cfg(feature = "board_k210")]
 pub const CLOCK_FREQ: usize = 403000000 / 62;
 
 #[cfg(feature = "board_qemu")]
 pub const CLOCK_FREQ: usize = 12500000;
+*/
+pub use crate::board::CLOCK_FREQ;

os/src/main.rs

@@ -4,6 +4,12 @@
 
 use core::arch::global_asm;
 
+#[cfg(feature = "board_k210")]
+#[path = "boards/k210.rs"]
+mod board;
+#[cfg(not(any(feature = "board_k210")))]
+#[path = "boards/qemu.rs"]
+mod board;
 #[macro_use]
 mod console;
 mod config;

os/src/task/mod.rs

@@ -1,5 +1,6 @@
 mod context;
 mod switch;
+#[allow(clippy::module_inception)]
 mod task;
 
 use crate::config::MAX_APP_NUM;
@@ -28,9 +29,9 @@ lazy_static! {
             task_cx: TaskContext::zero_init(),
             task_status: TaskStatus::UnInit,
         }; MAX_APP_NUM];
-        for i in 0..num_app {
-            tasks[i].task_cx = TaskContext::goto_restore(init_app_cx(i));
-            tasks[i].task_status = TaskStatus::Ready;
+        for (i, task) in tasks.iter_mut().enumerate() {
+            task.task_cx = TaskContext::goto_restore(init_app_cx(i));
+            task.task_status = TaskStatus::Ready;
         }
         TaskManager {
             num_app,