[Denali] Begin porting to rust.

rust/sys/denali/src/ahci/controller.rs

@@ -0,0 +1,49 @@
+use mammoth::mem::MemoryRegion;
+
+#[repr(C, packed)]
+pub struct PciDeviceHeader {
+    pub vendor_id: u16,
+    pub device_id: u16,
+    pub command_reg: u16,
+    pub status_reg: u16,
+    pub revision: u8,
+    pub prog_interface: u8,
+    pub subclass: u8,
+    pub class_code: u8,
+    pub cache_line_size: u8,
+    pub latency_timer: u8,
+    pub header_type: u8,
+    pub bist: u8,
+    pub bars: [u32; 5],
+    pub abar: u32,
+    pub reserved0: u32,
+    pub subsystem_id: u32,
+    pub expansion_rom: u16,
+    pub cap_ptr: u8,
+    pub reserved1: [u8; 7],
+    pub interrupt_line: u8,
+    pub interrupt_pin: u8,
+    pub min_grant: u8,
+    pub max_latency: u8,
+}
+
+pub struct AhciController {
+    pci_memory: MemoryRegion,
+}
+
+impl AhciController {
+    pub fn new(pci_memory: MemoryRegion) -> Self {
+        Self { pci_memory }
+    }
+
+    pub fn pci_header(&self) -> &mut PciDeviceHeader {
+        unsafe {
+            self.pci_memory
+                .mut_slice::<u8>()
+                .as_mut_ptr()
+                .cast::<PciDeviceHeader>()
+                .as_mut()
+                .unwrap()
+        }
+    }
+}

rust/sys/denali/src/ahci/mod.rs

@@ -0,0 +1,3 @@
+mod controller;
+
+pub use controller::AhciController;