Add support for serial port output

1 files changed, 11 insertions, 2 deletions

diff --git a/kernel/src/io.rs b/kernel/src/io.rs
index def8665..a647408 100644
--- a/kernel/src/io.rs
+++ b/kernel/src/io.rs
@@ -1,5 +1,14 @@
 pub unsafe fn out8(address: u16, value: u8) {
     asm!(
-        "out dx, al", in("dx") address, in("al") value
-    )
+    "out dx, al", in("dx") address, in("al") value
+    );
+}
+
+pub unsafe fn in8(address: u16) -> u8 {
+    let result: u8;
+    asm!(
+    "in al, dx", in("dx") address, out("al") result
+    );
+
+    result
 }