Kernel: Add IRQController class

This class is an abstraction layer for different IRQ controllers
that are present in a typical system.

Kernel/Interrupts/IRQController.h

@@ -0,0 +1,62 @@
+/*
+ * 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/String.h>
+#include <AK/Types.h>
+
+namespace Kernel {
+
+enum class IRQControllerType {
+    i8259 = 1,   /* Intel 8259 Dual PIC */
+    i82093AA = 2 /* Intel 82093AA I/O ADVANCED PROGRAMMABLE INTERRUPT CONTROLLER (IOAPIC) */
+};
+
+class IRQController {
+public:
+    virtual ~IRQController() {}
+
+    virtual void enable(u8 number) = 0;
+    virtual void disable(u8 number) = 0;
+    virtual void hard_disable() { m_hard_disabled = true; }
+    virtual bool is_vector_enabled(u8 number) const = 0;
+    bool is_enabled() const { return m_enabled && !m_hard_disabled; }
+    bool is_hard_disabled() const { return m_hard_disabled; }
+    virtual void eoi(u8 number) const = 0;
+    virtual u32 get_gsi_base() const = 0;
+    virtual u16 get_isr() const = 0;
+    virtual u16 get_irr() const = 0;
+    virtual const char* model() const = 0;
+    virtual IRQControllerType type() const = 0;
+
+protected:
+    IRQController() {}
+    virtual void initialize() = 0;
+    bool m_enabled { false };
+    bool m_hard_disabled { false };
+};
+}