1 files changed, 37 insertions, 0 deletions
diff --git a/src/bits64/io.rs b/src/bits64/io.rs
new file mode 100644
index 0000000..bb7cfb0
--- /dev/null
+++ b/src/bits64/io.rs
@@ -0,0 +1,37 @@
+//! I/O port functionality.
+
+/// Write 8 bits to port
+pub unsafe fn outb(port: u16, val: u8) {
+    asm!("outb %al, %dx" :: "{dx}"(port), "{al}"(val));
+}
+
+/// Read 8 bits from port
+pub unsafe fn inb(port: u16) -> u8 {
+    let ret: u8;
+    asm!("inb %dx, %al" : "={ax}"(ret) : "{dx}"(port) :: "volatile");
+    return ret;
+}
+
+/// Write 16 bits to port
+pub unsafe fn outw(port: u16, val: u16) {
+    asm!("outw %ax, %dx" :: "{dx}"(port), "{al}"(val));
+}
+
+/// Read 16 bits from port
+pub unsafe fn inw(port: u16) -> u16 {
+    let ret: u16;
+    asm!("inw %dx, %ax" : "={ax}"(ret) : "{dx}"(port) :: "volatile");
+    return ret;
+}
+
+/// Write 32 bits to port
+pub unsafe fn outl(port: u16, val: u32) {
+    asm!("outl %eax, %dx" :: "{dx}"(port), "{al}"(val));
+}
+
+/// Read 32 bits from port
+pub unsafe fn inl(port: u16) -> u32 {
+    let ret: u32;
+    asm!("inl %dx, %eax" : "={ax}"(ret) : "{dx}"(port) :: "volatile");
+    return ret;
+}