Kernel: Introduce the new Storage subsystem

This new subsystem is somewhat replacing the IDE disk code we had with a
new flexible design.

StorageDevice is a generic class that represent a generic storage
device. It is meant that specific storage hardware will override the
interface. StorageController is a generic class that represent
a storage controller that can be found in a machine.

The IDEController class governs two IDEChannels. An IDEChannel is
responsible to manage the master & slave devices of the channel,
therefore an IDEChannel is an IRQHandler.

Kernel/Storage/StorageController.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/OwnPtr.h>
+#include <AK/RefPtr.h>
+#include <Kernel/Devices/Device.h>
+#include <Kernel/IO.h>
+#include <Kernel/Lock.h>
+#include <Kernel/PCI/Access.h>
+#include <Kernel/PCI/DeviceController.h>
+#include <Kernel/PhysicalAddress.h>
+#include <Kernel/Random.h>
+#include <Kernel/VM/PhysicalPage.h>
+#include <Kernel/WaitQueue.h>
+
+namespace Kernel {
+
+class AsyncBlockDeviceRequest;
+class StorageDevice;
+class StorageController : public RefCounted<StorageController>
+    , public PCI::DeviceController {
+    AK_MAKE_ETERNAL
+public:
+protected:
+    explicit StorageController(PCI::Address address)
+        : PCI::DeviceController(address)
+    {
+    }
+
+    virtual RefPtr<StorageDevice> device(u32 index) = 0;
+    virtual void start_request(const StorageDevice&, AsyncBlockDeviceRequest&) = 0;
+
+protected:
+    virtual bool reset() = 0;
+    virtual bool shutdown() = 0;
+
+    virtual void complete_current_request(AsyncDeviceRequest::RequestResult) = 0;
+};
+}