Kernel: Move x86-specific HID code to the Arch/x86 directory

The i8042 controller with its attached devices, the PS2 keyboard and
mouse, rely on x86-specific IO instructions to work. Therefore, move
them to the Arch/x86 directory to make it easier to omit the handling
code of these devices.

Kernel/Arch/x86/ISABus/HID/VMWareMouseDevice.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Arch/x86/Hypervisor/VMWareBackdoor.h>
+#include <Kernel/Arch/x86/ISABus/HID/VMWareMouseDevice.h>
+#include <Kernel/Devices/DeviceManagement.h>
+#include <Kernel/Sections.h>
+
+namespace Kernel {
+
+UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<VMWareMouseDevice>> VMWareMouseDevice::try_to_initialize(I8042Controller const& ps2_controller)
+{
+    // FIXME: return the correct error
+    if (!VMWareBackdoor::the())
+        return Error::from_errno(EIO);
+    if (!VMWareBackdoor::the()->vmmouse_is_absolute())
+        return Error::from_errno(EIO);
+    auto mouse_device = TRY(DeviceManagement::try_create_device<VMWareMouseDevice>(ps2_controller));
+    TRY(mouse_device->initialize());
+    return mouse_device;
+}
+
+void VMWareMouseDevice::irq_handle_byte_read(u8)
+{
+    auto backdoor = VMWareBackdoor::the();
+    VERIFY(backdoor);
+    VERIFY(backdoor->vmmouse_is_absolute());
+
+    // We will receive 4 bytes from the I8042 controller that we are going to
+    // ignore. Instead, we will check with VMWareBackdoor to see how many bytes
+    // of mouse event data are waiting for us. For each multiple of 4, we
+    // produce a mouse packet.
+    constexpr u8 max_iterations = 128;
+    u8 current_iteration = 0;
+    while (++current_iteration < max_iterations) {
+        auto number_of_mouse_event_bytes = backdoor->read_mouse_status_queue_size();
+        if (number_of_mouse_event_bytes == 0)
+            break;
+        VERIFY(number_of_mouse_event_bytes % 4 == 0);
+
+        auto mouse_packet = backdoor->receive_mouse_packet();
+        m_entropy_source.add_random_event(mouse_packet);
+        {
+            SpinlockLocker lock(m_queue_lock);
+            m_queue.enqueue(mouse_packet);
+        }
+    }
+    evaluate_block_conditions();
+}
+
+VMWareMouseDevice::VMWareMouseDevice(I8042Controller const& ps2_controller)
+    : PS2MouseDevice(ps2_controller)
+{
+}
+VMWareMouseDevice::~VMWareMouseDevice() = default;
+
+}