Kernel: Introduce a new HID subsystem

The end goal of this commit is to allow to boot on bare metal with no
PS/2 device connected to the system. It turned out that the original
code relied on the existence of the PS/2 keyboard, so VirtualConsole
called it even though ACPI indicated the there's no i8042 controller on
my real machine because I didn't plug any PS/2 device.
The code is much more flexible, so adding HID support for other type of
hardware (e.g. USB HID) could be much simpler.

Briefly describing the change, we have a new singleton called
HIDManagement, which is responsible to initialize the i8042 controller
if exists, and to enumerate its devices. I also abstracted a bit
things, so now every Human interface device is represented with the
HIDDevice class. Then, there are 2 types of it - the MouseDevice and
KeyboardDevice classes; both are responsible to handle the interface in
the DevFS.

PS2KeyboardDevice, PS2MouseDevice and VMWareMouseDevice classes are
responsible for handling the hardware-specific interface they are
assigned to. Therefore, they are inheriting from the IRQHandler class.

Kernel/Devices/HID/I8042Controller.h

@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2020, The SerenityOS developers.
+ * 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/RefCounted.h>
+#include <Kernel/Devices/HID/KeyboardDevice.h>
+#include <Kernel/Devices/HID/MouseDevice.h>
+#include <Kernel/SpinLock.h>
+
+namespace Kernel {
+
+#define I8042_BUFFER 0x60
+#define I8042_STATUS 0x64
+#define I8042_ACK 0xFA
+#define I8042_RESEND 0xFE
+#define I8042_BUFFER_FULL 0x01
+
+#define I8042_WHICH_BUFFER 0x20
+
+#define I8042_KEYBOARD_BUFFER 0x00
+#define I8042_MOUSE_BUFFER 0x20
+
+class I8042Controller;
+class I8042Device {
+public:
+    virtual ~I8042Device() = default;
+
+    virtual void irq_handle_byte_read(u8 byte) = 0;
+
+protected:
+    explicit I8042Device(const I8042Controller& ps2_controller)
+        : m_i8042_controller(ps2_controller)
+    {
+    }
+
+    NonnullRefPtr<I8042Controller> m_i8042_controller;
+};
+
+class PS2KeyboardDevice;
+class PS2MouseDevice;
+class I8042Controller : public RefCounted<I8042Controller> {
+    friend class PS2KeyboardDevice;
+    friend class PS2MouseDevice;
+
+public:
+    static NonnullRefPtr<I8042Controller> initialize();
+
+    void detect_devices();
+
+    bool reset_device(HIDDevice::Type device)
+    {
+        ScopedSpinLock lock(m_lock);
+        return do_reset_device(device);
+    }
+
+    u8 send_command(HIDDevice::Type device, u8 command)
+    {
+        ScopedSpinLock lock(m_lock);
+        return do_send_command(device, command);
+    }
+    u8 send_command(HIDDevice::Type device, u8 command, u8 data)
+    {
+        ScopedSpinLock lock(m_lock);
+        return do_send_command(device, command, data);
+    }
+
+    u8 read_from_device(HIDDevice::Type device)
+    {
+        ScopedSpinLock lock(m_lock);
+        return do_read_from_device(device);
+    }
+
+    void wait_then_write(u8 port, u8 data)
+    {
+        ScopedSpinLock lock(m_lock);
+        do_wait_then_write(port, data);
+    }
+
+    u8 wait_then_read(u8 port)
+    {
+        ScopedSpinLock lock(m_lock);
+        return do_wait_then_read(port);
+    }
+
+    void prepare_for_output();
+    void prepare_for_input(HIDDevice::Type);
+
+    void irq_process_input_buffer(HIDDevice::Type);
+
+    RefPtr<MouseDevice> mouse() const;
+    RefPtr<KeyboardDevice> keyboard() const;
+
+private:
+    I8042Controller();
+    void do_drain();
+    bool do_reset_device(HIDDevice::Type);
+    u8 do_send_command(HIDDevice::Type type, u8 data);
+    u8 do_send_command(HIDDevice::Type device, u8 command, u8 data);
+    u8 do_write_to_device(HIDDevice::Type device, u8 data);
+    u8 do_read_from_device(HIDDevice::Type device);
+    void do_wait_then_write(u8 port, u8 data);
+    u8 do_wait_then_read(u8 port);
+
+    SpinLock<u8> m_lock;
+    bool m_first_port_available { false };
+    bool m_second_port_available { false };
+    bool m_is_dual_channel { false };
+    RefPtr<MouseDevice> m_mouse_device;
+    RefPtr<KeyboardDevice> m_keyboard_device;
+};
+
+}