1 files changed, 129 insertions, 0 deletions
diff --git a/src/kernel/KernelKit/DeviceMgr.h b/src/kernel/KernelKit/DeviceMgr.h
new file mode 100644
index 00000000..1dbad161
--- /dev/null
+++ b/src/kernel/KernelKit/DeviceMgr.h
@@ -0,0 +1,129 @@
+/* ========================================
+
+  Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
+
+======================================== */
+
+/* ========================================
+
+ Revision History:
+
+  31/01/24: Add kDeviceCnt (amlel)
+  15/11/24: Add NE_DEVICE macro, to inherit from device object.
+
+ ======================================== */
+
+#pragma once
+
+/* @note Device Mgr. */
+/* @file KernelKit/DeviceMgr.h */
+/* @brief Device abstraction and I/O buffer. */
+
+#include <NeKit/ErrorOr.h>
+#include <NeKit/Ref.h>
+
+#define kDeviceMgrRootDirPath "/devices/"
+
+#define NE_DEVICE : public ::Kernel::DeviceInterface
+
+// Last Rev: Wed, May  27, 2025  6:22 PM
+
+namespace Kernel {
+template <typename T>
+class DeviceInterface;
+
+template <typename T>
+class IOBuf;
+
+/***********************************************************************************/
+/// @brief Device contract interface, represents an HW device.
+/***********************************************************************************/
+template <typename T>
+class DeviceInterface {
+ public:
+  DeviceInterface() = default;
+
+  explicit DeviceInterface(void (*Out)(DeviceInterface<T>*, T), void (*In)(DeviceInterface<T>*, T))
+      : fOut(Out), fIn(In) {}
+
+  virtual ~DeviceInterface() = default;
+
+ public:
+  DeviceInterface& operator=(const DeviceInterface<T>&) = default;
+  DeviceInterface(const DeviceInterface<T>&)            = default;
+
+ public:
+  virtual DeviceInterface<T>& operator<<(T Data) {
+    fOut(this, Data);
+    return *this;
+  }
+
+  virtual DeviceInterface<T>& operator>>(T Data) {
+    fIn(this, Data);
+    return *this;
+  }
+
+  virtual const char* Name() const { return "/devices/null"; }
+
+  operator bool() { return fOut && fIn; }
+
+  Bool operator!() { return !fOut || !fIn; }
+
+ protected:
+  Void (*fOut)(DeviceInterface<T>*, T Data) = {nullptr};
+  Void (*fIn)(DeviceInterface<T>*, T Data)  = {nullptr};
+};
+
+///
+/// @brief Input Output abstract class.
+/// Used mainly to communicate between OS to hardware.
+///
+template <typename T>
+class IOBuf final {
+ public:
+  explicit IOBuf(T dma_addr) : fData(dma_addr) {
+    // At least pass something valid when instancating this struct.
+    MUST_PASS(fData);
+  }
+
+  IOBuf& operator=(const IOBuf<T>&) = default;
+  IOBuf(const IOBuf<T>&)            = default;
+
+  ~IOBuf() = default;
+
+ public:
+  template <typename R>
+  R operator->() const {
+    return fData;
+  }
+
+  template <typename R>
+  R& operator[](Size index) const {
+    return fData[index];
+  }
+
+ private:
+  T fData;
+};
+
+///! @brief Device enum types.
+enum {
+  kDeviceTypeInvalid = 0,
+  kDeviceTypeIDE     = 100,
+  kDeviceTypeEthernet,
+  kDeviceTypeWiFi,
+  kDeviceTypeFW,
+  kDeviceTypeBT,
+  kDeviceTypeRS232,
+  kDeviceTypeSCSI,
+  kDeviceTypeAHCI,
+  kDeviceTypeMBCI,
+  kDeviceTypeATA,
+  kDeviceTypeUSB,
+  kDeviceTypeAPM,  // Adv. Pwr. Mgmt.
+  kDeviceTypePCI,
+  kDeviceTypeVGA,
+  kDeviceTypeGPU,
+  kDeviceTypeCount,
+};
+}  // namespace Kernel