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/bins/display-qemu/Cargo.toml

@@ -15,5 +15,4 @@ libkos = { workspace = true }
 server-framework = { workspace = true }
 display-server = { workspace = true }
 driver-framebuffer-virtio = { workspace = true }
-driver-framebuffer-mock = { workspace = true }
 port-framebuffer = { workspace = true }

crates/bins/display-qemu/src/main.rs

@@ -8,12 +8,13 @@ use types::bounded::CapSlot;
 #[unsafe(no_mangle)]
 extern "C" fn main() {
     let ep = CapSlot::const_new(0);
-
-    if let Some(fb) = driver_framebuffer_virtio::VirtioFramebuffer::try_new() {
+    // Init hands over the GPU, or nothing if the machine has none.
+    let dev = libkos::device::receive_device(ep);
+    if let Some(fb) = dev.mmio.and_then(driver_framebuffer_virtio::VirtioFramebuffer::try_new) {
         run_virtio(fb, ep);
-    } else {
-        run_mock(ep);
     }
+    libkos::println!("display: no GPU, running headless");
+    run_headless(ep);
 }
 
 #[inline(never)]
@@ -25,12 +26,33 @@ fn run_virtio(mut fb: driver_framebuffer_virtio::VirtioFramebuffer, ep: CapSlot)
     server_framework::serve(&mut srv, ep)
 }
 
+/// No GPU: clients still get answers (and the dimensions they draw for);
+/// pixels go nowhere.
+struct Headless;
+
+impl port_framebuffer::Framebuffer for Headless {
+    fn width(&self) -> types::display::Dimension {
+        types::display::Dimension::new(640)
+    }
+    fn height(&self) -> types::display::Dimension {
+        types::display::Dimension::new(480)
+    }
+    fn write_pixel(&mut self, _: types::display::ScreenCoord, _: types::display::ScreenCoord, _: types::display::Color) {}
+    fn fill_rect(
+        &mut self,
+        _: types::display::ScreenCoord,
+        _: types::display::ScreenCoord,
+        _: types::display::Dimension,
+        _: types::display::Dimension,
+        _: types::display::Color,
+    ) {
+    }
+    fn clear(&mut self, _: types::display::Color) {}
+    fn flush(&mut self) {}
+}
+
 #[inline(never)]
-fn run_mock(ep: CapSlot) -> ! {
-    let fb = driver_framebuffer_mock::MockFramebuffer::new(
-        types::display::Dimension::new(640),
-        types::display::Dimension::new(480),
-    );
-    let mut srv = display_server::server::DisplayServer::new(fb);
+fn run_headless(ep: CapSlot) -> ! {
+    let mut srv = display_server::server::DisplayServer::new(Headless);
     server_framework::serve(&mut srv, ep)
 }