Kernel: Split ScopedCritical so header is platform independent

A new header file has been created in the Arch/ folder while the
implementation has been moved into a CPP living in the X86 folder.

Kernel/Arch/x86/ScopedCritical.cpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Arch/ScopedCritical.h>
+
+#include <Kernel/Arch/Processor.h>
+
+namespace Kernel {
+
+ScopedCritical::ScopedCritical()
+{
+    enter();
+}
+
+ScopedCritical::~ScopedCritical()
+{
+    if (m_valid)
+        leave();
+}
+
+ScopedCritical::ScopedCritical(ScopedCritical&& from)
+    : m_valid(exchange(from.m_valid, false))
+{
+}
+
+ScopedCritical& ScopedCritical::operator=(ScopedCritical&& from)
+{
+    if (&from != this) {
+        m_valid = exchange(from.m_valid, false);
+    }
+    return *this;
+}
+
+void ScopedCritical::leave()
+{
+    VERIFY(m_valid);
+    m_valid = false;
+    Processor::leave_critical();
+}
+
+void ScopedCritical::enter()
+{
+    VERIFY(!m_valid);
+    m_valid = true;
+    Processor::enter_critical();
+}
+
+}

Kernel/Arch/x86/ScopedCritical.h

@@ -1,61 +0,0 @@
-/*
- * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#pragma once
-
-#include <AK/Types.h>
-
-#include <Kernel/Arch/Processor.h>
-
-namespace Kernel {
-
-class ScopedCritical {
-    AK_MAKE_NONCOPYABLE(ScopedCritical);
-
-public:
-    ScopedCritical()
-    {
-        enter();
-    }
-
-    ~ScopedCritical()
-    {
-        if (m_valid)
-            leave();
-    }
-
-    ScopedCritical(ScopedCritical&& from)
-        : m_valid(exchange(from.m_valid, false))
-    {
-    }
-
-    ScopedCritical& operator=(ScopedCritical&& from)
-    {
-        if (&from != this) {
-            m_valid = exchange(from.m_valid, false);
-        }
-        return *this;
-    }
-
-    void leave()
-    {
-        VERIFY(m_valid);
-        m_valid = false;
-        Processor::leave_critical();
-    }
-
-    void enter()
-    {
-        VERIFY(!m_valid);
-        m_valid = true;
-        Processor::enter_critical();
-    }
-
-private:
-    bool m_valid { false };
-};
-
-}

Kernel/Arch/x86/common/Processor.cpp

@@ -16,13 +16,13 @@
 #include <Kernel/Thread.h>
 
 #include <Kernel/Arch/Processor.h>
+#include <Kernel/Arch/ScopedCritical.h>
 #include <Kernel/Arch/x86/CPUID.h>
 #include <Kernel/Arch/x86/InterruptDisabler.h>
 #include <Kernel/Arch/x86/Interrupts.h>
 #include <Kernel/Arch/x86/MSR.h>
 #include <Kernel/Arch/x86/ProcessorInfo.h>
 #include <Kernel/Arch/x86/SafeMem.h>
-#include <Kernel/Arch/x86/ScopedCritical.h>
 #include <Kernel/Arch/x86/TrapFrame.h>
 
 #include <Kernel/Memory/PageDirectory.h>