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/PS2KeyboardDevice.cpp

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Types.h>
+#include <Kernel/Arch/x86/ISABus/HID/PS2KeyboardDevice.h>
+#include <Kernel/Debug.h>
+#include <Kernel/Devices/DeviceManagement.h>
+#include <Kernel/Devices/HID/HIDManagement.h>
+#include <Kernel/Scheduler.h>
+#include <Kernel/Sections.h>
+#include <Kernel/TTY/ConsoleManagement.h>
+#include <Kernel/WorkQueue.h>
+
+namespace Kernel {
+
+#define IRQ_KEYBOARD 1
+
+void PS2KeyboardDevice::irq_handle_byte_read(u8 byte)
+{
+    u8 ch = byte & 0x7f;
+    bool pressed = !(byte & 0x80);
+
+    m_entropy_source.add_random_event(byte);
+
+    if (byte == 0xe0) {
+        m_has_e0_prefix = true;
+        return;
+    }
+
+    if ((m_modifiers == (Mod_Alt | Mod_Shift) || m_modifiers == (Mod_Ctrl | Mod_Alt | Mod_Shift)) && byte == 0x58) {
+        // Alt+Shift+F12 pressed, dump some kernel state to the debug console.
+        ConsoleManagement::the().switch_to_debug();
+        Scheduler::dump_scheduler_state(m_modifiers == (Mod_Ctrl | Mod_Alt | Mod_Shift));
+    }
+
+    dbgln_if(KEYBOARD_DEBUG, "Keyboard::irq_handle_byte_read: {:#02x} {}", ch, (pressed ? "down" : "up"));
+    switch (ch) {
+    case 0x38:
+        if (m_has_e0_prefix)
+            update_modifier(Mod_AltGr, pressed);
+        else
+            update_modifier(Mod_Alt, pressed);
+        break;
+    case 0x1d:
+        update_modifier(Mod_Ctrl, pressed);
+        break;
+    case 0x5b:
+        m_left_super_pressed = pressed;
+        update_modifier(Mod_Super, m_left_super_pressed || m_right_super_pressed);
+        break;
+    case 0x5c:
+        m_right_super_pressed = pressed;
+        update_modifier(Mod_Super, m_left_super_pressed || m_right_super_pressed);
+        break;
+    case 0x2a:
+        m_left_shift_pressed = pressed;
+        update_modifier(Mod_Shift, m_left_shift_pressed || m_right_shift_pressed);
+        break;
+    case 0x36:
+        m_right_shift_pressed = pressed;
+        update_modifier(Mod_Shift, m_left_shift_pressed || m_right_shift_pressed);
+        break;
+    }
+    switch (ch) {
+    case I8042Response::Acknowledge:
+        break;
+    default:
+        if ((m_modifiers & Mod_Alt) != 0 && ch >= 2 && ch <= ConsoleManagement::s_max_virtual_consoles + 1) {
+            // FIXME: Do something sanely here if we can't allocate a work queue?
+            MUST(g_io_work->try_queue([ch]() {
+                ConsoleManagement::the().switch_to(ch - 0x02);
+            }));
+        }
+        key_state_changed(ch, pressed);
+    }
+}
+
+bool PS2KeyboardDevice::handle_irq(RegisterState const&)
+{
+    // The controller will read the data and call irq_handle_byte_read
+    // for the appropriate device
+    return m_i8042_controller->irq_process_input_buffer(HIDDevice::Type::Keyboard);
+}
+
+UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<PS2KeyboardDevice>> PS2KeyboardDevice::try_to_initialize(I8042Controller const& ps2_controller)
+{
+    auto keyboard_device = TRY(DeviceManagement::try_create_device<PS2KeyboardDevice>(ps2_controller));
+
+    TRY(keyboard_device->initialize());
+
+    return keyboard_device;
+}
+
+UNMAP_AFTER_INIT ErrorOr<void> PS2KeyboardDevice::initialize()
+{
+    return m_i8042_controller->reset_device(HIDDevice::Type::Keyboard);
+}
+
+// FIXME: UNMAP_AFTER_INIT might not be correct, because in practice PS/2 devices
+// are hot pluggable.
+UNMAP_AFTER_INIT PS2KeyboardDevice::PS2KeyboardDevice(I8042Controller const& ps2_controller)
+    : IRQHandler(IRQ_KEYBOARD)
+    , KeyboardDevice()
+    , I8042Device(ps2_controller)
+{
+}
+
+// FIXME: UNMAP_AFTER_INIT might not be correct, because in practice PS/2 devices
+// are hot pluggable.
+UNMAP_AFTER_INIT PS2KeyboardDevice::~PS2KeyboardDevice() = default;
+
+}