From 83835c72564538e317a8e53b71fad47dbcee505d Mon Sep 17 00:00:00 2001
From: Liav A <liavalb@gmail.com>
Date: Sat, 5 Mar 2022 13:58:10 +0200
Subject: [PATCH] Kernel/HID: Add boot option to disable PS2 Mouse

---
 Base/usr/share/man/man7/boot_parameters.md    | 2 ++
 Kernel/Arch/x86_64/ISABus/I8042Controller.cpp | 3 ++-
 Kernel/Boot/CommandLine.cpp                   | 5 +++++
 Kernel/Boot/CommandLine.h                     | 1 +
 4 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/Base/usr/share/man/man7/boot_parameters.md b/Base/usr/share/man/man7/boot_parameters.md
index b04099bedd..6ecda181fa 100644
--- a/Base/usr/share/man/man7/boot_parameters.md
+++ b/Base/usr/share/man/man7/boot_parameters.md
@@ -28,6 +28,8 @@ List of options:
    during the boot sequence. Leaving only the AHCI and Ram Disk controllers.
 
 * **`disable_physical_storage`** - If present on the command line, neither AHCI, or IDE controllers will be initialized on boot.
+
+* **`disable_ps2_mouse`** - If present on the command line, no PS2 mouse will be attached.
     
 * **`disable_uhci_controller`** - If present on the command line, the UHCI controller will not be initialized on boot.
 
diff --git a/Kernel/Arch/x86_64/ISABus/I8042Controller.cpp b/Kernel/Arch/x86_64/ISABus/I8042Controller.cpp
index a675e33f06..0fd6cce927 100644
--- a/Kernel/Arch/x86_64/ISABus/I8042Controller.cpp
+++ b/Kernel/Arch/x86_64/ISABus/I8042Controller.cpp
@@ -8,6 +8,7 @@
 #include <Kernel/Arch/x86_64/IO.h>
 #include <Kernel/Arch/x86_64/ISABus/HID/VMWareMouseDevice.h>
 #include <Kernel/Arch/x86_64/ISABus/I8042Controller.h>
+#include <Kernel/Boot/CommandLine.h>
 #include <Kernel/Bus/SerialIO/Device.h>
 #include <Kernel/Devices/HID/KeyboardDevice.h>
 #include <Kernel/Devices/HID/MouseDevice.h>
@@ -216,7 +217,7 @@ UNMAP_AFTER_INIT ErrorOr<void> I8042Controller::detect_devices()
             m_first_ps2_port.device = error_or_device.release_value();
         }
     }
-    if (m_second_port_available) {
+    if (m_second_port_available && !kernel_command_line().disable_ps2_mouse()) {
         // FIXME: Actually figure out the connected PS2 device type
         m_second_ps2_port.device_type = PS2DeviceType::StandardMouse;
         auto mouse_device = TRY(MouseDevice::try_to_initialize());
diff --git a/Kernel/Boot/CommandLine.cpp b/Kernel/Boot/CommandLine.cpp
index 1db86eb84c..0dad946fe3 100644
--- a/Kernel/Boot/CommandLine.cpp
+++ b/Kernel/Boot/CommandLine.cpp
@@ -226,6 +226,11 @@ UNMAP_AFTER_INIT bool CommandLine::is_physical_networking_disabled() const
     return contains("disable_physical_networking"sv);
 }
 
+UNMAP_AFTER_INIT bool CommandLine::disable_ps2_mouse() const
+{
+    return contains("disable_ps2_mouse"sv);
+}
+
 UNMAP_AFTER_INIT bool CommandLine::disable_physical_storage() const
 {
     return contains("disable_physical_storage"sv);
diff --git a/Kernel/Boot/CommandLine.h b/Kernel/Boot/CommandLine.h
index 98395eab2e..180ddda392 100644
--- a/Kernel/Boot/CommandLine.h
+++ b/Kernel/Boot/CommandLine.h
@@ -90,6 +90,7 @@ public:
     [[nodiscard]] PanicMode panic_mode(Validate should_validate = Validate::No) const;
     [[nodiscard]] HPETMode hpet_mode() const;
     [[nodiscard]] bool disable_physical_storage() const;
+    [[nodiscard]] bool disable_ps2_mouse() const;
     [[nodiscard]] bool disable_uhci_controller() const;
     [[nodiscard]] bool disable_usb() const;
     [[nodiscard]] bool disable_virtio() const;