Gabriel Kaszewski
27be73f42d
VirtIO GPU: QEMU 11.x has RESOURCE_ATTACH_BACKING (0x0104) and RESOURCE_FLUSH (0x0106) command types swapped in its legacy MMIO VirtIO GPU implementation. Workaround: send swapped type values. Confirmed via QEMU monitor (xp shows correct bytes in memory) and QEMU trace events (device dispatches to wrong handler). Display pipeline now works end-to-end: adapter → GPU init → create_2d → attach_backing → set_scanout display-server → clear(blue) → flush → transfer + resource_flush snake → draw commands via IPC → display renders → flush to GPU Input server: - New driver-input-uart crate (reads UART at mapped VA 0x20000) - New bins/input-qemu composition root - Adapter loads input-server, maps UART MMIO into its address space - Init delegates both display_ep (slot 0) and input_ep (slot 1) to snake - WASD keys → UART → input-server → IPC → snake direction change Snake game runs with display and input, exits on wall collision.
48 lines
1.2 KiB
Rust
48 lines
1.2 KiB
Rust
#![no_std]
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use port_input_device::{InputDevice, InputEvent, Key};
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const UART_VA: usize = 0x20000;
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const UART_LSR_OFFSET: usize = 5;
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pub struct UartInputDevice;
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impl UartInputDevice {
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pub fn new() -> Self {
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Self
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}
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fn read_byte(&self) -> Option<u8> {
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let lsr = unsafe { core::ptr::read_volatile((UART_VA + UART_LSR_OFFSET) as *const u8) };
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if lsr & 1 != 0 {
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Some(unsafe { core::ptr::read_volatile(UART_VA as *const u8) })
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} else {
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None
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}
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}
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fn byte_to_key(byte: u8) -> Key {
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match byte {
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b'w' | b'W' => Key::Up,
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b's' | b'S' => Key::Down,
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b'a' | b'A' => Key::Left,
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b'd' | b'D' => Key::Right,
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b'\r' | b'\n' => Key::Enter,
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0x1B => Key::Escape,
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c => Key::Char(c),
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}
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}
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}
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impl InputDevice for UartInputDevice {
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fn poll(&mut self) -> Option<InputEvent> {
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let byte = self.read_byte()?;
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Some(InputEvent::KeyDown(Self::byte_to_key(byte)))
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}
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fn has_event(&self) -> bool {
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let lsr = unsafe { core::ptr::read_volatile((UART_VA + UART_LSR_OFFSET) as *const u8) };
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lsr & 1 != 0
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}
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}
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