diff --git a/build.rs b/build.rs
index b9fb0f3..c0ba1f6 100644
--- a/build.rs
+++ b/build.rs
@@ -3,17 +3,17 @@ fn main() {
 
     struct TargetConfig {
         target: &'static str,
-        lds: &'static str,
+        lds:    &'static str,
     }
 
     const TARGET_LDS: &[TargetConfig] = &[
         TargetConfig {
             target: "riscv64",
-            lds: "src/arch/riscv/linker.ld",
+            lds:    "src/arch/riscv/linker.ld",
         },
         TargetConfig {
             target: "riscv32",
-            lds: "src/arch/riscv/linker.ld",
+            lds:    "src/arch/riscv/linker.ld",
         },
     ];
 
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..ee754e5
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,14 @@
+unstable_features = true
+edition = "2021"
+
+blank_lines_lower_bound = 0
+enum_discrim_align_threshold = 20
+struct_field_align_threshold = 20
+
+condense_wildcard_suffixes = true
+format_macro_matchers = true
+match_arm_leading_pipes = "Preserve"
+match_block_trailing_comma = true
+reorder_impl_items = true
+use_try_shorthand = true
+where_single_line = true
diff --git a/src/arch/riscv/trap.rs b/src/arch/riscv/trap.rs
index 7107d7e..f47c206 100644
--- a/src/arch/riscv/trap.rs
+++ b/src/arch/riscv/trap.rs
@@ -1,4 +1,5 @@
 use lazy_static::lazy_static;
+
 #[cfg(feature = "arch_riscv64")]
 core::arch::global_asm!(
     include_str!("./asm/trap64.S"),
@@ -27,11 +28,17 @@ lazy_static! {
 
 #[repr(C)]
 pub struct TrapContext {
-    pub gprs: [usize; 31],   // GPRs exclude zero
-    pub user_sepc: usize,    // 248/124 user program counter
-    pub user_sstatus: usize, // 256/128 user status register
-    pub kernel_sp: usize,    // 264/132 kernel stack pointer
-    pub kernel_tp: usize,    // 272/136 kernel tp
-    pub kernel_trap: usize,  // 280/140 kernel trap handler
-    pub kernel_satp: usize,  // 288/144 kernel page table
+    pub gprs:         [usize; 31],
+    // GPRs exclude zero
+    pub user_sepc:    usize,
+    // 248/124 user program counter
+    pub user_sstatus: usize,
+    // 256/128 user status register
+    pub kernel_sp:    usize,
+    // 264/132 kernel stack pointer
+    pub kernel_tp:    usize,
+    // 272/136 kernel tp
+    pub kernel_trap:  usize,
+    // 280/140 kernel trap handler
+    pub kernel_satp:  usize, // 288/144 kernel page table
 }
diff --git a/src/entry.rs b/src/entry.rs
index 8702b25..afb9a37 100644
--- a/src/entry.rs
+++ b/src/entry.rs
@@ -2,6 +2,7 @@ use log::{error, info};
 
 use crate::utils::lowlevel::{Hardware, LowLevel};
 
+#[no_mangle]
 pub extern "C" fn rust_main(hart_id: usize, device_tree_addr: usize) -> ! {
     crate::logging::init();
 
diff --git a/src/mm/addr.rs b/src/mm/addr.rs
index 8f6d73b..b829b88 100644
--- a/src/mm/addr.rs
+++ b/src/mm/addr.rs
@@ -28,15 +28,11 @@ pub trait AddressOps {
     fn as_usize(&self) -> usize;
     fn as_non_zero_usize(&self) -> Option<NonZeroUsize>;
     fn align_up<T>(&self, align: T) -> Self
-    where
-        T: Into<usize>;
+    where T: Into<usize>;
     fn align_down<T>(&self, align: T) -> Self
-    where
-        T: Into<usize>;
+    where T: Into<usize>;
     fn is_aligned<T>(&self, align: T) -> bool
-    where
-        T: Into<usize> + Copy,
-    {
+    where T: Into<usize> + Copy {
         if align.into().is_power_of_two() {
             self.as_usize() & (align.into() - 1) == 0
         } else {
@@ -63,16 +59,12 @@ impl AddressOps for PhysAddr {
     }
 
     fn align_up<T>(&self, align: T) -> Self
-    where
-        T: Into<usize>,
-    {
+    where T: Into<usize> {
         PhysAddr(align_up(self.0, align.into()))
     }
 
     fn align_down<T>(&self, align: T) -> Self
-    where
-        T: Into<usize>,
-    {
+    where T: Into<usize> {
         PhysAddr(align_down(self.0, align.into()))
     }
 }
@@ -95,16 +87,12 @@ impl AddressOps for VirtAddr {
     }
 
     fn align_up<T>(&self, align: T) -> Self
-    where
-        T: Into<usize>,
-    {
+    where T: Into<usize> {
         VirtAddr(align_up(self.0, align.into()))
     }
 
     fn align_down<T>(&self, align: T) -> Self
-    where
-        T: Into<usize>,
-    {
+    where T: Into<usize> {
         VirtAddr(align_down(self.0, align.into()))
     }
 }
diff --git a/src/mm/page.rs b/src/mm/page.rs
index 13d7df3..9ebd519 100644
--- a/src/mm/page.rs
+++ b/src/mm/page.rs
@@ -1,7 +1,9 @@
-use crate::mm::addr::{AddressOps, PhysAddr, VirtAddr};
-use bitflags::bitflags;
 use core::marker::PhantomData;
 
+use bitflags::bitflags;
+
+use crate::mm::addr::{AddressOps, PhysAddr, VirtAddr};
+
 #[derive(Debug)]
 pub enum PagingError {
     AddressNotAligned,
@@ -38,7 +40,7 @@ pub trait PageSize {
 
 pub struct Page<S: PageSize> {
     start_address: VirtAddr,
-    size: PhantomData<S>,
+    size:          PhantomData<S>,
 }
 
 impl<S: PageSize> Page<S> {
@@ -47,7 +49,7 @@ impl<S: PageSize> Page<S> {
     pub fn new(addr: VirtAddr) -> Self {
         Self {
             start_address: addr.align_down(Self::SIZE),
-            size: PhantomData,
+            size:          PhantomData,
         }
     }
 }
diff --git a/src/test_runner.rs b/src/test_runner.rs
index 7386d44..60ffd1b 100644
--- a/src/test_runner.rs
+++ b/src/test_runner.rs
@@ -18,8 +18,7 @@ pub trait Testable {
 }
 
 impl<T> Testable for T
-where
-    T: Fn(),
+where T: Fn()
 {
     fn run(&self) {
         info!("[TEST] [{}] Testing", core::any::type_name::<T>());
diff --git a/src/utils/io.rs b/src/utils/io.rs
index f6d069e..ce3e283 100644
--- a/src/utils/io.rs
+++ b/src/utils/io.rs
@@ -1,6 +1,5 @@
 pub struct RawConsole
-where
-    RawConsole: Printer;
+where RawConsole: Printer;
 
 pub trait Printer: core::fmt::Write {
     fn put_char(c: char);