KeyboardSettings+Kernel: Setting to enable Num Lock on login

Kernel/API/Syscall.h

@@ -143,6 +143,7 @@ namespace Kernel {
     S(getrandom)                  \
     S(getkeymap)                  \
     S(setkeymap)                  \
+    S(set_num_lock)               \
     S(clock_gettime)              \
     S(clock_settime)              \
     S(clock_nanosleep)            \

Kernel/CMakeLists.txt

@@ -191,6 +191,7 @@ set(KERNEL_SOURCES
     Syscalls/mmap.cpp
     Syscalls/module.cpp
     Syscalls/mount.cpp
+    Syscalls/num_lock.cpp
     Syscalls/open.cpp
     Syscalls/perf_event.cpp
     Syscalls/pipe.cpp

Kernel/Devices/HID/HIDManagement.cpp

@@ -98,6 +98,11 @@ void HIDManagement::set_maps(const Keyboard::CharacterMapData& character_map_dat
     dbgln("New Character map '{}' passed in by client.", character_map_name);
 }
 
+void HIDManagement::set_num_lock(bool on)
+{
+    m_i8042_controller->keyboard()->set_num_lock(on);
+}
+
 UNMAP_AFTER_INIT void HIDManagement::enumerate()
 {
     // FIXME: When we have USB HID support, we should ensure that we disable

Kernel/Devices/HID/HIDManagement.h

@@ -45,6 +45,7 @@ public:
     const Keyboard::CharacterMap& character_map() const { return m_character_map; }
     void set_client(KeyboardClient* client) { m_client = client; }
     void set_maps(const Keyboard::CharacterMapData& character_map, const String& character_map_name);
+    void set_num_lock(bool on);
 
 private:
     size_t generate_minor_device_number_for_mouse();

Kernel/Devices/HID/KeyboardDevice.h

@@ -45,6 +45,8 @@ public:
             m_modifiers &= ~modifier;
     }
 
+    void set_num_lock(bool on) { m_num_lock_on = on; }
+
 protected:
     KeyboardDevice();
     mutable SpinLock<u8> m_queue_lock;

Kernel/Process.h

@@ -291,6 +291,7 @@ public:
     KResultOr<FlatPtr> sys$getresuid(Userspace<uid_t*>, Userspace<uid_t*>, Userspace<uid_t*>);
     KResultOr<FlatPtr> sys$getresgid(Userspace<gid_t*>, Userspace<gid_t*>, Userspace<gid_t*>);
     KResultOr<FlatPtr> sys$umask(mode_t);
+    KResultOr<FlatPtr> sys$set_num_lock(bool);
     KResultOr<FlatPtr> sys$open(Userspace<const Syscall::SC_open_params*>);
     KResultOr<FlatPtr> sys$close(int fd);
     KResultOr<FlatPtr> sys$read(int fd, Userspace<u8*>, size_t);

Kernel/Syscalls/num_lock.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Devices/HID/HIDManagement.h>
+#include <Kernel/Process.h>
+
+namespace Kernel {
+
+KResultOr<FlatPtr> Process::sys$set_num_lock(bool on)
+{
+    HIDManagement::the().set_num_lock(on);
+    return 0;
+}
+
+}