[Denali] Add identify device command.

sys/denali/ahci/ahci_port.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <glacier/container/array_view.h>
+#include <glacier/status/error.h>
+#include <mammoth/util/memory_region.h>
+#include <ztypes.h>
+
+#include "ahci/ahci.h"
+#include "ahci/command.h"
+
+class AhciPort {
+ public:
+  AhciPort() {}
+  // Caller retains ownership of the pointer.
+  AhciPort(AhciPortHba* port_struct);
+
+  void DumpInfo();
+
+  bool IsSata() { return port_struct_->signature == 0x101; }
+  bool IsInit() { return port_struct_ != nullptr && command_structures_; }
+
+  glcr::ErrorCode IssueCommand(Command* command);
+
+  void HandleIrq();
+
+  AhciPort(const AhciPort&) = delete;
+  AhciPort& operator=(const AhciPort&) = delete;
+
+ private:
+  volatile AhciPortHba* port_struct_ = nullptr;
+  mmth::OwnedMemoryRegion command_structures_;
+
+  volatile CommandList* command_list_ = nullptr;
+  volatile ReceivedFis* received_fis_ = nullptr;
+  glcr::ArrayView<CommandTable> command_tables_;
+
+  Command* commands_[32];
+  uint32_t commands_issued_ = 0;
+};