Move PS/2 driver to userspace

drivers/ps2d/src/keyboard.rs

@@ -0,0 +1,34 @@
+use std::fs::File;
+use std::io::{Read, Write};
+use std::mem;
+use std::thread;
+
+use keymap;
+
+pub fn keyboard() {
+    let mut file = File::open("irq:1").expect("ps2d: failed to open irq:1");
+
+    loop {
+        let mut irqs = [0; 8];
+        if file.read(&mut irqs).expect("ps2d: failed to read irq:1") >= mem::size_of::<usize>() {
+            let data: u8;
+            unsafe {
+                asm!("in al, dx" : "={al}"(data) : "{dx}"(0x60) : : "intel", "volatile");
+            }
+
+            let (scancode, pressed) = if data >= 0x80 {
+                (data - 0x80, false)
+            } else {
+                (data, true)
+            };
+
+            if pressed {
+                print!("{}", keymap::get_char(scancode));
+            }
+
+            file.write(&irqs).expect("ps2d: failed to write irq:1");
+        } else {
+            thread::yield_now();
+        }
+    }
+}