diff --git a/src/arch/mod.rs b/src/arch/mod.rs
new file mode 100644
index 0000000..1abbd03
--- /dev/null
+++ b/src/arch/mod.rs
@@ -0,0 +1,5 @@
+#[cfg(target_arch = "x86_64")]
+#[macro_use]
+pub mod x86_64;
+#[cfg(target_arch = "x86_64")]
+pub use self::x86_64::*;
\ No newline at end of file
diff --git a/src/device/cpu.rs b/src/arch/x86_64/device/cpu.rs
similarity index 100%
rename from src/device/cpu.rs
rename to src/arch/x86_64/device/cpu.rs
diff --git a/src/device/hpet.rs b/src/arch/x86_64/device/hpet.rs
similarity index 100%
rename from src/device/hpet.rs
rename to src/arch/x86_64/device/hpet.rs
diff --git a/src/device/local_apic.rs b/src/arch/x86_64/device/local_apic.rs
similarity index 100%
rename from src/device/local_apic.rs
rename to src/arch/x86_64/device/local_apic.rs
diff --git a/src/device/mod.rs b/src/arch/x86_64/device/mod.rs
similarity index 100%
rename from src/device/mod.rs
rename to src/arch/x86_64/device/mod.rs
diff --git a/src/device/pic.rs b/src/arch/x86_64/device/pic.rs
similarity index 100%
rename from src/device/pic.rs
rename to src/arch/x86_64/device/pic.rs
diff --git a/src/device/pit.rs b/src/arch/x86_64/device/pit.rs
similarity index 100%
rename from src/device/pit.rs
rename to src/arch/x86_64/device/pit.rs
diff --git a/src/device/rtc.rs b/src/arch/x86_64/device/rtc.rs
similarity index 100%
rename from src/device/rtc.rs
rename to src/arch/x86_64/device/rtc.rs
diff --git a/src/arch/x86_64/device/serial.rs b/src/arch/x86_64/device/serial.rs
new file mode 100644
index 0000000..05905a7
--- /dev/null
+++ b/src/arch/x86_64/device/serial.rs
@@ -0,0 +1,11 @@
+use devices::uart_16550::SerialPort;
+use syscall::io::Pio;
+use spin::Mutex;
+
+pub static COM1: Mutex<SerialPort<Pio<u8>>> = Mutex::new(SerialPort::<Pio<u8>>::new(0x3F8));
+pub static COM2: Mutex<SerialPort<Pio<u8>>> = Mutex::new(SerialPort::<Pio<u8>>::new(0x2F8));
+
+pub unsafe fn init() {
+    COM1.lock().init();
+    COM2.lock().init();
+}
diff --git a/src/gdt.rs b/src/arch/x86_64/gdt.rs
similarity index 100%
rename from src/gdt.rs
rename to src/arch/x86_64/gdt.rs
diff --git a/src/idt.rs b/src/arch/x86_64/idt.rs
similarity index 100%
rename from src/idt.rs
rename to src/arch/x86_64/idt.rs
diff --git a/src/interrupt/exception.rs b/src/arch/x86_64/interrupt/exception.rs
similarity index 100%
rename from src/interrupt/exception.rs
rename to src/arch/x86_64/interrupt/exception.rs
diff --git a/src/interrupt/ipi.rs b/src/arch/x86_64/interrupt/ipi.rs
similarity index 100%
rename from src/interrupt/ipi.rs
rename to src/arch/x86_64/interrupt/ipi.rs
diff --git a/src/interrupt/irq.rs b/src/arch/x86_64/interrupt/irq.rs
similarity index 100%
rename from src/interrupt/irq.rs
rename to src/arch/x86_64/interrupt/irq.rs
diff --git a/src/interrupt/mod.rs b/src/arch/x86_64/interrupt/mod.rs
similarity index 100%
rename from src/interrupt/mod.rs
rename to src/arch/x86_64/interrupt/mod.rs
diff --git a/src/interrupt/syscall.rs b/src/arch/x86_64/interrupt/syscall.rs
similarity index 100%
rename from src/interrupt/syscall.rs
rename to src/arch/x86_64/interrupt/syscall.rs
diff --git a/src/interrupt/trace.rs b/src/arch/x86_64/interrupt/trace.rs
similarity index 100%
rename from src/interrupt/trace.rs
rename to src/arch/x86_64/interrupt/trace.rs
diff --git a/src/macros.rs b/src/arch/x86_64/macros.rs
similarity index 91%
rename from src/macros.rs
rename to src/arch/x86_64/macros.rs
index 2c8d133..ff4f79c 100644
--- a/src/macros.rs
+++ b/src/arch/x86_64/macros.rs
@@ -3,7 +3,7 @@
 macro_rules! print {
     ($($arg:tt)*) => ({
         use core::fmt::Write;
-        let _ = write!($crate::device::serial::COM1.lock(), $($arg)*);
+        let _ = write!($crate::arch::device::serial::COM1.lock(), $($arg)*);
     });
 }
 
@@ -85,7 +85,7 @@ macro_rules! interrupt_stack {
         #[naked]
         pub unsafe extern fn $name () {
             #[inline(never)]
-            unsafe fn inner($stack: &mut $crate::macros::InterruptStack) {
+            unsafe fn inner($stack: &mut $crate::arch::x86_64::macros::InterruptStack) {
                 $func
             }
 
@@ -109,7 +109,7 @@ macro_rules! interrupt_stack {
             asm!("" : "={rsp}"(rsp) : : : "intel", "volatile");
 
             // Call inner rust function
-            inner(&mut *(rsp as *mut $crate::macros::InterruptStack));
+            inner(&mut *(rsp as *mut $crate::arch::x86_64::macros::InterruptStack));
 
             // Pop scratch registers and return
             asm!("pop fs
@@ -153,7 +153,7 @@ macro_rules! interrupt_error {
         #[naked]
         pub unsafe extern fn $name () {
             #[inline(never)]
-            unsafe fn inner($stack: &$crate::macros::InterruptErrorStack) {
+            unsafe fn inner($stack: &$crate::arch::x86_64::macros::InterruptErrorStack) {
                 $func
             }
 
@@ -177,7 +177,7 @@ macro_rules! interrupt_error {
             asm!("" : "={rsp}"(rsp) : : : "intel", "volatile");
 
             // Call inner rust function
-            inner(&*(rsp as *const $crate::macros::InterruptErrorStack));
+            inner(&*(rsp as *const $crate::arch::x86_64::macros::InterruptErrorStack));
 
             // Pop scratch registers, error code, and return
             asm!("pop fs
diff --git a/src/arch/x86_64/mod.rs b/src/arch/x86_64/mod.rs
new file mode 100644
index 0000000..7ae1a8e
--- /dev/null
+++ b/src/arch/x86_64/mod.rs
@@ -0,0 +1,23 @@
+#[macro_use]
+pub mod macros;
+
+/// Devices
+pub mod device;
+
+/// Global descriptor table
+pub mod gdt;
+
+/// Interrupt descriptor table
+pub mod idt;
+
+/// Interrupt instructions
+pub mod interrupt;
+
+/// Paging
+pub mod paging;
+
+/// Initialization and start function
+pub mod start;
+
+/// Stop function
+pub mod stop;
\ No newline at end of file
diff --git a/src/paging/entry.rs b/src/arch/x86_64/paging/entry.rs
similarity index 100%
rename from src/paging/entry.rs
rename to src/arch/x86_64/paging/entry.rs
diff --git a/src/paging/mapper.rs b/src/arch/x86_64/paging/mapper.rs
similarity index 100%
rename from src/paging/mapper.rs
rename to src/arch/x86_64/paging/mapper.rs
diff --git a/src/paging/mod.rs b/src/arch/x86_64/paging/mod.rs
similarity index 100%
rename from src/paging/mod.rs
rename to src/arch/x86_64/paging/mod.rs
diff --git a/src/paging/table.rs b/src/arch/x86_64/paging/table.rs
similarity index 100%
rename from src/paging/table.rs
rename to src/arch/x86_64/paging/table.rs
diff --git a/src/paging/temporary_page.rs b/src/arch/x86_64/paging/temporary_page.rs
similarity index 100%
rename from src/paging/temporary_page.rs
rename to src/arch/x86_64/paging/temporary_page.rs
diff --git a/src/start.rs b/src/arch/x86_64/start.rs
similarity index 100%
rename from src/start.rs
rename to src/arch/x86_64/start.rs
diff --git a/src/stop.rs b/src/arch/x86_64/stop.rs
similarity index 100%
rename from src/stop.rs
rename to src/arch/x86_64/stop.rs
diff --git a/src/devices/mod.rs b/src/devices/mod.rs
new file mode 100644
index 0000000..9dc8d5b
--- /dev/null
+++ b/src/devices/mod.rs
@@ -0,0 +1 @@
+pub mod uart_16550;
\ No newline at end of file
diff --git a/src/device/serial.rs b/src/devices/uart_16550.rs
similarity index 74%
rename from src/device/serial.rs
rename to src/devices/uart_16550.rs
index b29c8b0..8dfb356 100644
--- a/src/device/serial.rs
+++ b/src/devices/uart_16550.rs
@@ -1,16 +1,7 @@
 use core::fmt::{self, Write};
-use spin::Mutex;
 
 use scheme::debug::debug_input;
-use syscall::io::{Io, Pio, ReadOnly};
-
-pub static COM1: Mutex<SerialPort> = Mutex::new(SerialPort::new(0x3F8));
-pub static COM2: Mutex<SerialPort> = Mutex::new(SerialPort::new(0x2F8));
-
-pub unsafe fn init() {
-    COM1.lock().init();
-    COM2.lock().init();
-}
+use syscall::io::{Io, Pio, Mmio, ReadOnly};
 
 bitflags! {
     /// Interrupt enable flags
@@ -34,25 +25,25 @@ bitflags! {
 }
 
 #[allow(dead_code)]
-pub struct SerialPort {
+pub struct SerialPort<T: Io<Value = u8>> {
     /// Data register, read to receive, write to send
-    data: Pio<u8>,
+    data: T,
     /// Interrupt enable
-    int_en: Pio<u8>,
+    int_en: T,
     /// FIFO control
-    fifo_ctrl: Pio<u8>,
+    fifo_ctrl: T,
     /// Line control
-    line_ctrl: Pio<u8>,
+    line_ctrl: T,
     /// Modem control
-    modem_ctrl: Pio<u8>,
+    modem_ctrl: T,
     /// Line status
-    line_sts: ReadOnly<Pio<u8>>,
+    line_sts: ReadOnly<T>,
     /// Modem status
-    modem_sts: ReadOnly<Pio<u8>>,
+    modem_sts: ReadOnly<T>,
 }
 
-impl SerialPort {
-    const fn new(base: u16) -> SerialPort {
+impl SerialPort<Pio<u8>> {
+    pub const fn new(base: u16) -> SerialPort<Pio<u8>> {
         SerialPort {
             data: Pio::new(base),
             int_en: Pio::new(base + 1),
@@ -63,8 +54,24 @@ impl SerialPort {
             modem_sts: ReadOnly::new(Pio::new(base + 6))
         }
     }
+}
 
-    fn init(&mut self) {
+impl SerialPort<Mmio<u8>> {
+    pub fn new(base: usize) -> SerialPort<Mmio<u8>> {
+        SerialPort {
+            data: Mmio::new(),
+            int_en: Mmio::new(),
+            fifo_ctrl: Mmio::new(),
+            line_ctrl: Mmio::new(),
+            modem_ctrl: Mmio::new(),
+            line_sts: ReadOnly::new(Mmio::new()),
+            modem_sts: ReadOnly::new(Mmio::new())
+        }
+    }
+}
+
+impl<T: Io<Value = u8>> SerialPort<T> {
+    pub fn init(&mut self) {
         //TODO: Cleanup
         self.int_en.write(0x00);
         self.line_ctrl.write(0x80);
@@ -104,7 +111,7 @@ impl SerialPort {
     }
 }
 
-impl Write for SerialPort {
+impl<T: Io<Value = u8>> Write for SerialPort<T> {
     fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> {
         for byte in s.bytes() {
             self.send(byte);
diff --git a/src/lib.rs b/src/lib.rs
index 533b9e4..33e746a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -42,9 +42,10 @@ pub use consts::*;
 /// Shared data structures
 pub mod common;
 
-/// Macros like print, println, and interrupt
+/// Architecture-dependent stuff
 #[macro_use]
-pub mod macros;
+pub mod arch;
+pub use arch::*;
 
 /// Constants like memory locations
 pub mod consts;
@@ -55,8 +56,8 @@ mod acpi;
 /// Context management
 pub mod context;
 
-/// Devices
-pub mod device;
+/// Architecture-independent devices
+pub mod devices;
 
 /// ELF file parsing
 pub mod elf;
@@ -64,33 +65,15 @@ pub mod elf;
 /// External functions
 pub mod externs;
 
-/// Global descriptor table
-pub mod gdt;
-
-/// Interrupt descriptor table
-mod idt;
-
-/// Interrupt instructions
-pub mod interrupt;
-
 /// Memory management
 pub mod memory;
 
-/// Paging
-pub mod paging;
-
 /// Panic
 pub mod panic;
 
 /// Schemes, filesystem handlers
 pub mod scheme;
 
-/// Initialization and start function
-pub mod start;
-
-/// Shutdown function
-pub mod stop;
-
 /// Synchronization primitives
 pub mod sync;