Kernel: Add the DeviceController class in the PCI subsystem

Such device is not an IRQHandler by itself, but actually a controller of
many IRQ or MSI devices. The purpose of this class is to manage multiple
sources of interrupts.

For example, a generic ISA IDE controller controls 2 IRQ sources - 14
and 15. So, when we initialize the IDE controller, it will initialize
two IDE channels (also known as PATAChannels) to utilize IRQ 14 and 15,
respectively. NVMe with MSI-X support can theoretically handle up to
2048 interrupts.

Kernel/CMakeLists.txt

@@ -83,6 +83,7 @@ set(KERNEL_SOURCES
     Net/UDPSocket.cpp
     PCI/Access.cpp
     PCI/Device.cpp
+    PCI/DeviceController.cpp
     PCI/IOAccess.cpp
     PCI/Initializer.cpp
     PCI/MMIOAccess.cpp

Kernel/PCI/Definitions.h

@@ -28,6 +28,7 @@
 
 #include <AK/Function.h>
 #include <AK/LogStream.h>
+#include <AK/String.h>
 #include <AK/Types.h>
 
 namespace Kernel {
@@ -221,6 +222,7 @@ class Access;
 class MMIOAccess;
 class IOAccess;
 class MMIOSegment;
+class DeviceController;
 class Device;
 
 }

Kernel/PCI/DeviceController.cpp

@@ -0,0 +1,38 @@
+/*
+ * 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.
+ */
+
+#include <Kernel/PCI/DeviceController.h>
+
+namespace Kernel {
+namespace PCI {
+
+DeviceController::DeviceController(Address address)
+    : m_pci_address(address)
+{
+}
+
+}
+}

Kernel/PCI/DeviceController.h

@@ -0,0 +1,45 @@
+/*
+ * 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/Types.h>
+#include <Kernel/PCI/Definitions.h>
+
+namespace Kernel {
+class PCI::DeviceController {
+public:
+    Address pci_address() const { return m_pci_address; };
+
+    virtual ~DeviceController() { }
+
+protected:
+    explicit DeviceController(Address pci_address);
+
+private:
+    Address m_pci_address;
+};
+}