feat: devices via caps (BootInfo, init assigns devices, drivers map MMIO/DMA themselves, IRQ-driven input); drop boot device wiring and info pages; headless display fallback

crates/drivers/input/uart/Cargo.toml

@@ -4,4 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+libkos = { workspace = true }
+types = { workspace = true }
 port-input-device = { workspace = true }

crates/drivers/input/uart/src/lib.rs

@@ -3,13 +3,22 @@
 use port_input_device::{InputDevice, InputEvent, Key};
 
 const UART_VA: usize = 0x20000;
+const UART_IER_OFFSET: usize = 1;
 const UART_LSR_OFFSET: usize = 5;
+/// IER bit: interrupt when a received byte is waiting (cleared by reading
+/// it, so `acknowledge` has nothing to do).
+const IER_RX_READY: u8 = 1;
 
 pub struct UartInputDevice;
 
 impl UartInputDevice {
-    pub fn new() -> Self {
-        Self
+    /// Maps the 16550 UART whose region `mmio` names and enables its
+    /// receive interrupt.
+    pub fn new(mmio: types::bounded::CapSlot) -> Option<Self> {
+        libkos::device::map_mmio(mmio, UART_VA).ok()?;
+        // SAFETY: UART_VA now maps the UART's registers.
+        unsafe { core::ptr::write_volatile((UART_VA + UART_IER_OFFSET) as *mut u8, IER_RX_READY) };
+        Some(Self)
     }
 
     fn read_byte(&self) -> Option<u8> {