diff --git a/crates/servers/display-server/src/adapters/mod.rs b/crates/servers/display-server/src/adapters/mod.rs index 9afc1d5..b80b308 100644 --- a/crates/servers/display-server/src/adapters/mod.rs +++ b/crates/servers/display-server/src/adapters/mod.rs @@ -1 +1,2 @@ pub mod mock; +pub mod qemu_virtio; diff --git a/crates/servers/display-server/src/adapters/qemu_virtio.rs b/crates/servers/display-server/src/adapters/qemu_virtio.rs new file mode 100644 index 0000000..6e4d586 --- /dev/null +++ b/crates/servers/display-server/src/adapters/qemu_virtio.rs @@ -0,0 +1,81 @@ +use crate::framebuffer::Framebuffer; + +const VIRTIO_GPU_BASE: usize = 0x10008000; +const FB_WIDTH: u16 = 640; +const FB_HEIGHT: u16 = 480; +const FB_BPP: usize = 4; + +pub struct VirtioFramebuffer { + buffer: &'static mut [u8], + width: u16, + height: u16, + stride: usize, +} + +impl VirtioFramebuffer { + pub fn new(buffer_addr: usize) -> Self { + let stride = FB_WIDTH as usize * FB_BPP; + let size = stride * FB_HEIGHT as usize; + let buffer = unsafe { core::slice::from_raw_parts_mut(buffer_addr as *mut u8, size) }; + + for byte in buffer.iter_mut() { + *byte = 0; + } + + Self { + buffer, + width: FB_WIDTH, + height: FB_HEIGHT, + stride, + } + } +} + +impl Framebuffer for VirtioFramebuffer { + fn width(&self) -> u16 { + self.width + } + + fn height(&self) -> u16 { + self.height + } + + fn write_pixel(&mut self, x: u16, y: u16, color: u32) { + if x >= self.width || y >= self.height { + return; + } + let offset = (y as usize) * self.stride + (x as usize) * FB_BPP; + let bytes = color.to_le_bytes(); + self.buffer[offset] = bytes[0]; + self.buffer[offset + 1] = bytes[1]; + self.buffer[offset + 2] = bytes[2]; + self.buffer[offset + 3] = bytes[3]; + } + + fn fill_rect(&mut self, x: u16, y: u16, w: u16, h: u16, color: u32) { + for dy in 0..h { + for dx in 0..w { + self.write_pixel(x + dx, y + dy, color); + } + } + } + + fn clear(&mut self, color: u32) { + let bytes = color.to_le_bytes(); + for y in 0..self.height as usize { + for x in 0..self.width as usize { + let offset = y * self.stride + x * FB_BPP; + self.buffer[offset] = bytes[0]; + self.buffer[offset + 1] = bytes[1]; + self.buffer[offset + 2] = bytes[2]; + self.buffer[offset + 3] = bytes[3]; + } + } + } + + fn flush(&mut self) { + // VirtIO GPU flush would send TRANSFER_TO_HOST_2D + RESOURCE_FLUSH + // For now, the buffer is memory-mapped — no explicit flush needed + // when using ramfb or a simple scanout + } +}