[orbis-kernel] WIP new io device implementation

Not used yet

orbis-kernel/include/orbis/uio.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <cstdint>
+
+namespace orbis {
+struct IoVec {
+  void *base;        // Base address
+  std::uint64_t len; // Length
+};
+
+enum class UioRw : std::uint8_t { Read, Write };
+
+// Segment flag values
+enum class UioSeg : std::uint8_t {
+  UserSpace, // from user data space
+  SysSpace,  // from system space
+  NoCopy     // don't copy, already in object
+};
+
+struct Uio {
+  std::uint64_t offset;
+  IoVec *iov;
+  std::int32_t iovcnt;
+  std::int32_t resid;
+  UioSeg segflg;
+  UioRw rw;
+  void *td;
+};
+} // namespace orbis