diff --git a/src/gdt.rs b/src/gdt.rs
index 84758ec..2807cc3 100644
--- a/src/gdt.rs
+++ b/src/gdt.rs
@@ -1,8 +1,8 @@
-use x86_64::VirtAddr;
-use x86_64::structures::tss::TaskStateSegment;
 use lazy_static::lazy_static;
-use x86_64::structures::gdt::{GlobalDescriptorTable, Descriptor};
 use x86_64::structures::gdt::SegmentSelector;
+use x86_64::structures::gdt::{Descriptor, GlobalDescriptorTable};
+use x86_64::structures::tss::TaskStateSegment;
+use x86_64::VirtAddr;
 
 pub const DOUBLE_FAULT_IST_INDEX: u16 = 0;
 
@@ -25,7 +25,13 @@ lazy_static! {
         let mut gdt = GlobalDescriptorTable::new();
         let code_selector = gdt.add_entry(Descriptor::kernel_code_segment());
         let tss_selector = gdt.add_entry(Descriptor::tss_segment(&TSS));
-        (gdt, Selectors { code_selector, tss_selector })
+        (
+            gdt,
+            Selectors {
+                code_selector,
+                tss_selector,
+            },
+        )
     };
 }
 
diff --git a/src/interrupts.rs b/src/interrupts.rs
index 652888c..66a8d53 100644
--- a/src/interrupts.rs
+++ b/src/interrupts.rs
@@ -1,23 +1,22 @@
-use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame, PageFaultErrorCode};
-use crate::{println, print};
-use lazy_static::lazy_static;
 use crate::gdt;
+use crate::hlt_loop;
+use crate::{print, println};
+use lazy_static::lazy_static;
 use pic8259::ChainedPics;
 use spin;
-use crate::hlt_loop;
+use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame, PageFaultErrorCode};
 
 lazy_static! {
     static ref IDT: InterruptDescriptorTable = {
         let mut idt = InterruptDescriptorTable::new();
         idt.breakpoint.set_handler_fn(breakpoint_handler);
         unsafe {
-            idt.double_fault.set_handler_fn(double_fault_handler)
+            idt.double_fault
+                .set_handler_fn(double_fault_handler)
                 .set_stack_index(gdt::DOUBLE_FAULT_IST_INDEX);
         }
-        idt[InterruptIndex::Timer.as_usize()]
-            .set_handler_fn(timer_interrupt_handler);
-        idt[InterruptIndex::Keyboard.as_usize()]
-            .set_handler_fn(keyboard_interrupt_handler);
+        idt[InterruptIndex::Timer.as_usize()].set_handler_fn(timer_interrupt_handler);
+        idt[InterruptIndex::Keyboard.as_usize()].set_handler_fn(keyboard_interrupt_handler);
         idt.page_fault.set_handler_fn(page_fault_handler);
         idt
     };
@@ -31,7 +30,10 @@ extern "x86-interrupt" fn breakpoint_handler(stack_frame: InterruptStackFrame) {
     println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
 }
 
-extern "x86-interrupt" fn double_fault_handler(stack_frame: InterruptStackFrame, _error_code: u64) -> ! {
+extern "x86-interrupt" fn double_fault_handler(
+    stack_frame: InterruptStackFrame,
+    _error_code: u64,
+) -> ! {
     panic!("EXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
 }
 
@@ -70,8 +72,9 @@ extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStac
     use x86_64::instructions::port::Port;
 
     lazy_static! {
-        static ref KEYBOARD: Mutex<Keyboard<layouts::Us104Key, ScancodeSet1>> =
-            Mutex::new(Keyboard::new(layouts::Us104Key, ScancodeSet1, HandleControl::Ignore));
+        static ref KEYBOARD: Mutex<Keyboard<layouts::Us104Key, ScancodeSet1>> = Mutex::new(
+            Keyboard::new(layouts::Us104Key, ScancodeSet1, HandleControl::Ignore)
+        );
     }
 
     let mut keyboard = KEYBOARD.lock();
@@ -92,7 +95,10 @@ extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStac
     }
 }
 
-extern "x86-interrupt" fn page_fault_handler(stack_frame: InterruptStackFrame, error_code: PageFaultErrorCode) {
+extern "x86-interrupt" fn page_fault_handler(
+    stack_frame: InterruptStackFrame,
+    error_code: PageFaultErrorCode,
+) {
     use x86_64::registers::control::Cr2;
     println!("EXCEPTION: PAGE FAULT");
     println!("Accessed Address: {:?}", Cr2::read());
diff --git a/src/lib.rs b/src/lib.rs
index 852eee4..bff9277 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,11 +6,11 @@
 #![feature(abi_x86_interrupt)]
 
 use core::panic::PanicInfo;
+pub mod gdt;
+pub mod interrupts;
+pub mod memory;
 pub mod serial;
 pub mod vga_buffer;
-pub mod interrupts;
-pub mod gdt;
-pub mod memory;
 
 pub trait Testable {
     fn run(&self) -> ();
@@ -21,9 +21,9 @@ where
     T: Fn(),
 {
     fn run(&self) {
-        serial_print!("{}...\t", core::any::type_name::<T>());  // 打印函数名
-        self();     // 执行这个函数。由于 T 具有 Fn() trait 所以它能够作为一个函数被直接调用
-        serial_println!("[ok]");    // 打印 "[ok]"
+        serial_print!("{}...\t", core::any::type_name::<T>()); // 打印函数名
+        self(); // 执行这个函数。由于 T 具有 Fn() trait 所以它能够作为一个函数被直接调用
+        serial_println!("[ok]"); // 打印 "[ok]"
     }
 }
 
@@ -80,7 +80,7 @@ pub fn exit_qemu(exit_code: QemuExitCode) {
     use x86_64::instructions::port::Port;
 
     unsafe {
-        let mut port = Port::new(0xf4);     // iobase port
+        let mut port = Port::new(0xf4); // iobase port
         port.write(exit_code as u32);
     }
 }
diff --git a/src/main.rs b/src/main.rs
index ceab20d..5e16bf0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,18 +1,18 @@
-#![no_std]      // 不链接 Rust 标准库
-#![no_main]     // 禁用 main 入口点，因为没有运行时
+#![no_std] // 不链接 Rust 标准库
+#![no_main] // 禁用 main 入口点，因为没有运行时
 #![feature(custom_test_frameworks)]
 #![test_runner(anos::test_runner)]
 #![reexport_test_harness_main = "test_main"]
 
-use core::panic::PanicInfo;
 use anos::println;
-use bootloader::{BootInfo, entry_point};
+use bootloader::{entry_point, BootInfo};
+use core::panic::PanicInfo;
 
 entry_point!(kernel_main);
 
 fn kernel_main(boot_info: &'static BootInfo) -> ! {
-    use anos::memory::{ self, BootInfoFrameAllocator };
-    use x86_64::{ structures::paging::Page, VirtAddr };
+    use anos::memory::{self, BootInfoFrameAllocator};
+    use x86_64::{structures::paging::Page, VirtAddr};
 
     println!("Hello World{}", "!");
     anos::init();
@@ -25,7 +25,7 @@ fn kernel_main(boot_info: &'static BootInfo) -> ! {
     memory::create_example_mapping(page, &mut mapper, &mut frame_allocator);
 
     let page_ptr: *mut u64 = page.start_address().as_mut_ptr();
-    unsafe { page_ptr.offset(400).write_volatile(0x_f021_f077_f065_f04e)};
+    unsafe { page_ptr.offset(400).write_volatile(0x_f021_f077_f065_f04e) };
 
     // 触发一个中断
     x86_64::instructions::interrupts::int3();
diff --git a/src/memory.rs b/src/memory.rs
index 275a117..a9bd5b6 100644
--- a/src/memory.rs
+++ b/src/memory.rs
@@ -33,9 +33,7 @@ pub fn create_example_mapping(
     let frame = PhysFrame::containing_address(PhysAddr::new(0xb8000));
     let flags = Flags::PRESENT | Flags::WRITABLE;
 
-    let map_to_result = unsafe {
-        mapper.map_to(page, frame, flags, frame_allocator)
-    };
+    let map_to_result = unsafe { mapper.map_to(page, frame, flags, frame_allocator) };
     map_to_result.expect("map_to failed").flush();
 }
 
diff --git a/src/serial.rs b/src/serial.rs
index 353b13a..919ad95 100644
--- a/src/serial.rs
+++ b/src/serial.rs
@@ -1,6 +1,6 @@
-use uart_16550::SerialPort;
-use spin::Mutex;
 use lazy_static::lazy_static;
+use spin::Mutex;
+use uart_16550::SerialPort;
 
 lazy_static! {
     pub static ref SERIAL1: Mutex<SerialPort> = {
diff --git a/src/vga_buffer.rs b/src/vga_buffer.rs
index 83df5b0..848b8c6 100644
--- a/src/vga_buffer.rs
+++ b/src/vga_buffer.rs
@@ -3,14 +3,14 @@
 // 这实际上是通过内存操作的副作用来实现的
 // 但由于我们从未访问过这段内存，所以它可能会在未来的 Rust 编译器中被优化掉
 // 为了告诉编译器，这部分针对内存的操作是我们故意的，就需要用到 volatile crate
-use volatile::Volatile;
 use core::fmt;
 use lazy_static::lazy_static;
 use spin::Mutex;
+use volatile::Volatile;
 
 #[allow(dead_code)] // 允许未使用的代码
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]    // 启用 copy 语义
-#[repr(u8)]         // 每个 enum variant 都以 u8 存储
+#[derive(Debug, Clone, Copy, PartialEq, Eq)] // 启用 copy 语义
+#[repr(u8)] // 每个 enum variant 都以 u8 存储
 pub enum Color {
     Black = 0,
     Blue = 1,
@@ -31,7 +31,7 @@ pub enum Color {
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[repr(transparent)]    // 为了保证 ColorCode 和 u8 有同样的数据布局
+#[repr(transparent)] // 为了保证 ColorCode 和 u8 有同样的数据布局
 struct ColorCode(u8);
 
 impl ColorCode {
@@ -41,7 +41,7 @@ impl ColorCode {
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[repr(C)]  // 使数据结构的布局和 C 一样，这样才能保证每个成员的顺序一致
+#[repr(C)] // 使数据结构的布局和 C 一样，这样才能保证每个成员的顺序一致
 struct ScreenChar {
     ascii_character: u8,
     color_code: ColorCode,
@@ -56,9 +56,9 @@ struct Buffer {
 }
 
 pub struct Writer {
-    column_position: usize,         // 当前光标所在列
-    color_code: ColorCode,          // 当前颜色代码
-    buffer: &'static mut Buffer,    // VGA Buffer 的引用，生命周期是 'static
+    column_position: usize,      // 当前光标所在列
+    color_code: ColorCode,       // 当前颜色代码
+    buffer: &'static mut Buffer, // VGA Buffer 的引用，生命周期是 'static
 }
 
 impl Writer {
@@ -71,7 +71,7 @@ impl Writer {
                 if self.column_position >= BUFFER_WIDTH {
                     self.new_line();
                 }
-                let row = BUFFER_HEIGHT -1;
+                let row = BUFFER_HEIGHT - 1;
                 let col = self.column_position;
                 let color_code = self.color_code;
                 // 将 ScreenChar 写入到 Buffer 的相应位置
@@ -88,11 +88,11 @@ impl Writer {
         for row in 1..BUFFER_HEIGHT {
             for col in 0..BUFFER_WIDTH {
                 let character = self.buffer.chars[row][col].read();
-                self.buffer.chars[row -1][col].write(character);
+                self.buffer.chars[row - 1][col].write(character);
             }
         }
         // 清空最下面的一行
-        self.clear_row(BUFFER_HEIGHT -1);
+        self.clear_row(BUFFER_HEIGHT - 1);
         // 将当前列的位置设为 0
         self.column_position = 0;
     }
@@ -161,19 +161,22 @@ pub fn _print(args: fmt::Arguments) {
 }
 
 #[test_case]
-fn test_println_simple() {  // 测试单行 println!
+fn test_println_simple() {
+    // 测试单行 println!
     println!("test_println_simple output");
 }
 
 #[test_case]
-fn test_println_many() {    // 测试多行 println!
+fn test_println_many() {
+    // 测试多行 println!
     for _ in 0..10 {
         println!("test_println_many output");
     }
 }
 
 #[test_case]
-fn test_println_output() {  // 测试字符是否真的打印到了屏幕上
+fn test_println_output() {
+    // 测试字符是否真的打印到了屏幕上
     use core::fmt::Write;
     use x86_64::instructions::interrupts;
 
diff --git a/tests/basic_boot.rs b/tests/basic_boot.rs
index 7477812..6b716b7 100644
--- a/tests/basic_boot.rs
+++ b/tests/basic_boot.rs
@@ -4,8 +4,8 @@
 #![test_runner(anos::test_runner)]
 #![reexport_test_harness_main = "test_main"]
 
-use core::panic::PanicInfo;
 use anos::println;
+use core::panic::PanicInfo;
 
 #[no_mangle]
 pub extern "C" fn _start() -> ! {
diff --git a/tests/should_panic.rs b/tests/should_panic.rs
index 36d4d0c..8eed418 100644
--- a/tests/should_panic.rs
+++ b/tests/should_panic.rs
@@ -1,8 +1,8 @@
 #![no_std]
 #![no_main]
 
+use anos::{exit_qemu, serial_print, serial_println, QemuExitCode};
 use core::panic::PanicInfo;
-use anos::{QemuExitCode, exit_qemu, serial_println, serial_print};
 
 #[panic_handler]
 fn panic(_info: &PanicInfo) -> ! {
diff --git a/tests/stack_overflow.rs b/tests/stack_overflow.rs
index d46c760..9cdb43e 100644
--- a/tests/stack_overflow.rs
+++ b/tests/stack_overflow.rs
@@ -2,8 +2,8 @@
 #![no_main]
 #![feature(abi_x86_interrupt)]
 
+use anos::{exit_qemu, serial_print, serial_println, QemuExitCode};
 use core::panic::PanicInfo;
-use anos::{exit_qemu, QemuExitCode, serial_println, serial_print};
 use lazy_static::lazy_static;
 use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame};
 
@@ -43,7 +43,10 @@ pub fn init_test_idt() {
     TEST_IDT.load();
 }
 
-extern "x86-interrupt" fn test_double_fault_handler(_stack_frame: InterruptStackFrame, _error_code: u64) -> ! {
+extern "x86-interrupt" fn test_double_fault_handler(
+    _stack_frame: InterruptStackFrame,
+    _error_code: u64,
+) -> ! {
     serial_println!("[ok]");
     exit_qemu(QemuExitCode::Success);
     loop {}