Rust XHCI Implementation.

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+use core::{
+    ops::{Deref, Index, IndexMut},
+    slice::SliceIndex,
+};
+
+use alloc::{boxed::Box, vec};
+use bitfield_struct::bitfield;
+use mammoth::physical_box::PhysicalBox;
+
+#[bitfield(u128)]
+pub struct TransferRequestBlock {
+    parameter: u64,
+    status: u32,
+    cycle: bool,
+    evaluate_next: bool,
+    flag_2: bool,
+    flag_3: bool,
+    flag_4: bool,
+    flag_5: bool,
+    flag_6: bool,
+    flag_7: bool,
+    flag_8: bool,
+    flag_9: bool,
+    #[bits(6)]
+    trb_type: u8,
+    control: u16,
+}
+
+#[repr(transparent)]
+pub struct TrbRing(PhysicalBox<[TransferRequestBlock]>);
+
+impl TrbRing {
+    pub fn new(size: usize) -> Self {
+        Self(PhysicalBox::default_with_count(
+            TransferRequestBlock::default(),
+            size,
+        ))
+    }
+
+    pub fn len(&self) -> usize {
+        self.0.len()
+    }
+
+    pub fn physical_address(&self) -> usize {
+        self.0.physical_address()
+    }
+}
+
+impl<I> Index<I> for TrbRing {
+    type Output = TransferRequestBlock;
+
+    fn index(&self, index: I) -> &Self::Output {
+        self.0[index]
+    }
+}
+
+impl<I> IndexMut<I> for TrbRing
+where
+    I: SliceIndex<[TransferRequestBlock]>,
+{
+    fn index_mut(&mut self, index: I) -> &mut Self::Output {
+        &mut self.0[index]
+    }
+}