1 files changed, 28 insertions, 16 deletions
diff --git a/src/arch/x86_64/io_port.rs b/src/arch/x86_64/io_port.rs
index f5755f4..7b37989 100644
--- a/src/arch/x86_64/io_port.rs
+++ b/src/arch/x86_64/io_port.rs
@@ -1,29 +1,41 @@
-extern "C" {
-	fn _inb(port: u16) -> u8;
-	fn _inw(port: u16) -> u16;
-	fn _outb(port: u16, val: u8);
-	fn _outw(port: u16, val: u16);
-}
-
-// The port addr is 16-bit wide.
-// wrappers for in/out[b,w]
-// Also I don't feel necessary to have a IO_Port Class give how
-// trivial it is
-// TODO perhaps use inline asm, because the code is short
+use core::arch::asm;
 
 pub fn inw(p: u16) -> u16 {
-	unsafe { _inw(p) }
+	let result: u16;
+	unsafe {
+		asm!("in ax, dx",
+			in("dx") p,
+			out("ax") result
+		)
+	}
+	result
 }
 
 pub fn inb(p: u16) -> u8 {
-	unsafe { _inb(p) }
+	let result: u8;
+	unsafe {
+		asm!("in al, dx",
+			in("dx") p,
+			out("al") result
+		)
+	}
+	result
 }
+
 pub fn outb(p: u16, val: u8) {
 	unsafe {
-		_outb(p, val);
+		asm!("out dx, al",
+			in("dx") p,
+			in("al") val,
+		)
 	}
 }
 
 pub fn outw(p: u16, val: u16) {
-	unsafe { _outw(p, val) }
+	unsafe {
+		asm!("out dx, ax",
+			in("dx") p,
+			in("ax") val,
+		)
+	}
 }