Kernel: Simplify the Interrupt management initialization

Kernel/Interrupts/InterruptManagement.cpp

@@ -28,6 +28,7 @@
 #include <AK/StringView.h>
 #include <Kernel/ACPI/MultiProcessorParser.h>
 #include <Kernel/Arch/i386/CPU.h>
+#include <Kernel/CommandLine.h>
 #include <Kernel/Interrupts/APIC.h>
 #include <Kernel/Interrupts/IOAPIC.h>
 #include <Kernel/Interrupts/InterruptManagement.h>
@@ -59,6 +60,11 @@ void InterruptManagement::initialize()
 {
     ASSERT(!InterruptManagement::initialized());
     s_interrupt_management = new InterruptManagement();
+
+    if (kernel_command_line().lookup("smp").value_or("off") == "on")
+        InterruptManagement::the().switch_to_ioapic_mode();
+    else
+        InterruptManagement::the().switch_to_pic_mode();
 }
 
 void InterruptManagement::enumerate_interrupt_handlers(Function<void(GenericInterruptHandler&)> callback)

Kernel/init.cpp

@@ -85,7 +85,6 @@ namespace Kernel {
 
 [[noreturn]] static void init_stage2();
 static void setup_serial_debug();
-static void setup_interrupts();
 static void setup_time_management();
 
 VirtualConsole* tty0;
@@ -121,7 +120,7 @@ extern "C" [[noreturn]] void init()
     for (ctor_func_t* ctor = &start_ctors; ctor < &end_ctors; ctor++)
         (*ctor)();
 
-    setup_interrupts();
+    InterruptManagement::initialize();
     ACPI::initialize();
 
     new VFS;
@@ -358,28 +357,6 @@ extern "C" int __cxa_atexit(void (*)(void*), void*, void*)
     return 0;
 }
 
-void setup_interrupts()
-{
-    InterruptManagement::initialize();
-
-    if (!kernel_command_line().contains("smp")) {
-        InterruptManagement::the().switch_to_pic_mode();
-        return;
-    }
-    auto smp = kernel_command_line().get("smp");
-    if (smp == "off") {
-        InterruptManagement::the().switch_to_pic_mode();
-        return;
-    }
-    if (smp == "on") {
-        InterruptManagement::the().switch_to_ioapic_mode();
-        return;
-    }
-
-    klog() << "smp boot argmuent has an invalid value.";
-    hang();
-}
-
 void setup_time_management()
 {
     if (!kernel_command_line().contains("time")) {