refactor: ByteOffset newtype for window/register/ring offsets; named virtio-gpu cmd fields

crates/hw-virtio/src/queue.rs

@@ -1,13 +1,14 @@
 use crate::mmio::{MmioAccess, REG_QUEUE_NOTIFY};
 use core::sync::atomic::{Ordering, fence};
 use libkos::Window;
+use types::address::ByteOffset;
 
 pub const QUEUE_SIZE: usize = 8;
 const DESC_SIZE: usize = 16;
 const TIMEOUT: u32 = 10_000_000;
 /// Where the legacy layout puts the available and used rings.
-const AVAIL: usize = QUEUE_SIZE * DESC_SIZE;
-const USED: usize = 4096;
+const AVAIL: ByteOffset = ByteOffset::new(QUEUE_SIZE * DESC_SIZE);
+const USED: ByteOffset = ByteOffset::new(4096);
 
 pub struct Descriptor {
     pub addr: u64,
@@ -32,7 +33,7 @@ impl VirtioQueue {
         }
         let r = &self.rings;
         for (i, d) in descs.iter().enumerate() {
-            let at = i * DESC_SIZE;
+            let at = ByteOffset::new(i * DESC_SIZE);
             let last = i == descs.len() - 1;
             let flags: u16 = if d.writable { 2 } else { 0 } | if !last { 1 } else { 0 };
             r.write(at, d.addr);