drivers: start building virtio-gpu

Signed-off-by: Anhad Singh <andypython@protonmail.com>

Cargo.lock

@@ -1948,6 +1948,16 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "virtio-gpud"
+version = "0.1.0"
+dependencies = [
+ "log",
+ "pcid",
+ "redox-daemon",
+ "virtio-core",
+]
+
 [[package]]
 name = "virtio-netd"
 version = "0.1.0"

Cargo.toml

@@ -25,6 +25,7 @@ members = [
 
     "virtio-blkd",
     "virtio-netd",
+    "virtio-gpud",
     "virtio-core",
 ]
 

README.md

@@ -24,7 +24,7 @@ These are the currently implemented devices/hardware interfaces.
 - usbctl - USB control (incomplete).
 - usbhidd - USB HID (incomplete).
 - usbscsid - USB SCSI (incomplete).
-- virtio-* - VirtIO (incomplete) (`virtio-blk`, `virtio-net`).
+- virtio-* - VirtIO (incomplete) (`virtio-blk`, `virtio-net`, `virtio-gpu`).
 
 ## Contributing to Drivers
 

initfs.toml

@@ -41,3 +41,12 @@ vendor = 6900
 device = 4096
 command = ["virtio-netd"]
 use_channel = true
+
+[[drivers]]
+name = "virtio-gpu"
+class = 3
+subclass = 0
+vendor = 6900
+device = 4176
+command = ["virtio-gpud"]
+use_channel = true

virtio-core/src/utils.rs

@@ -64,6 +64,10 @@ pub const fn align(val: usize, align: usize) -> usize {
     (val + align) & !align
 }
 
+pub const fn align_down(addr: usize) -> usize {
+    addr & !(syscall::PAGE_SIZE - 1)
+}
+
 #[cfg(target_os = "redox")]
 pub fn setup_logging(level: log::LevelFilter, name: &str) {
     use redox_log::{OutputBuilder, RedoxLogger};

virtio-gpud/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "virtio-gpud"
+version = "0.1.0"
+edition = "2021"
+authors = ["Anhad Singh <andypython@protonmail.com>"]
+
+[dependencies]
+log = "0.4"
+
+virtio-core = { path = "../virtio-core" }
+pcid = { path = "../pcid" }
+
+redox-daemon = "0.1"

virtio-gpud/src/main.rs

@@ -0,0 +1,28 @@
+use pcid_interface::PcidServerHandle;
+use virtio_core::transport::Error;
+
+fn deamon(deamon: redox_daemon::Daemon) -> Result<(), Error> {
+    let mut pcid_handle = PcidServerHandle::connect_default()?;
+
+    // Double check that we have the right device.
+    //
+    // 0x1050 - virtio-gpu
+    let pci_config = pcid_handle.fetch_config()?;
+
+    assert_eq!(pci_config.func.devid, 0x1050);
+    log::info!("virtio-gpu: initiating startup sequence :^)");
+
+    let device = virtio_core::probe_device(&mut pcid_handle)?;
+    loop {}
+}
+
+fn daemon_runner(redox_daemon: redox_daemon::Daemon) -> ! {
+    deamon(redox_daemon).unwrap();
+    unreachable!();
+}
+
+pub fn main() {
+    #[cfg(target_os = "redox")]
+    virtio_core::utils::setup_logging(log::LevelFilter::Trace, "virtio-gpud");
+    redox_daemon::Daemon::new(daemon_runner).expect("virtio-core: failed to daemonize");
+}