From 6432f3eee8b21979c0a455008f0a8d2124ed15a7 Mon Sep 17 00:00:00 2001
From: Timon Kruiper <timonkruiper@gmail.com>
Date: Tue, 23 Aug 2022 21:25:36 +0200
Subject: [PATCH] Kernel: Add enum InterruptsState and helper functions

This commit adds the concept of an InterruptsState to the kernel. This
will be used to make the Spinlock code architecture independent. A new
Processor.cpp file is added such that we don't have to duplicate the
code.
---
 Kernel/Arch/Processor.cpp | 25 +++++++++++++++++++++++++
 Kernel/Arch/Processor.h   | 13 +++++++++++++
 Kernel/CMakeLists.txt     |  4 ++++
 3 files changed, 42 insertions(+)
 create mode 100644 Kernel/Arch/Processor.cpp

diff --git a/Kernel/Arch/Processor.cpp b/Kernel/Arch/Processor.cpp
new file mode 100644
index 0000000000..f3bb93ad3a
--- /dev/null
+++ b/Kernel/Arch/Processor.cpp
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2022, Timon Kruiper <timonkruiper@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Arch/Processor.h>
+
+namespace Kernel {
+
+// FIXME: Move the InterruptsState related functions inside the Processor class, when we have a generic Processor base class.
+InterruptsState processor_interrupts_state()
+{
+    return Processor::are_interrupts_enabled() ? InterruptsState::Enabled : InterruptsState::Disabled;
+}
+
+void restore_processor_interrupts_state(InterruptsState interrupts_state)
+{
+    if (interrupts_state == InterruptsState::Enabled)
+        Processor::enable_interrupts();
+    else
+        Processor::disable_interrupts();
+}
+
+}
diff --git a/Kernel/Arch/Processor.h b/Kernel/Arch/Processor.h
index 2b4794e851..f634cfb603 100644
--- a/Kernel/Arch/Processor.h
+++ b/Kernel/Arch/Processor.h
@@ -10,6 +10,19 @@
 #include <AK/Function.h>
 #include <Kernel/Arch/DeferredCallEntry.h>
 
+namespace Kernel {
+
+// FIXME: Move the InterruptsState enum and related functions inside the Processor class.
+enum class InterruptsState {
+    Enabled,
+    Disabled
+};
+
+InterruptsState processor_interrupts_state();
+void restore_processor_interrupts_state(InterruptsState);
+
+}
+
 #if ARCH(X86_64) || ARCH(I386)
 #    include <Kernel/Arch/x86/Processor.h>
 #elif ARCH(AARCH64)
diff --git a/Kernel/CMakeLists.txt b/Kernel/CMakeLists.txt
index b850dc3291..acdee8de2a 100644
--- a/Kernel/CMakeLists.txt
+++ b/Kernel/CMakeLists.txt
@@ -329,6 +329,8 @@ set(KERNEL_SOURCES
 if ("${SERENITY_ARCH}" STREQUAL "i686" OR "${SERENITY_ARCH}" STREQUAL "x86_64")
     set(KERNEL_SOURCES
         ${KERNEL_SOURCES}
+        Arch/Processor.cpp
+
         Arch/x86/common/ScopedCritical.cpp
         Arch/x86/common/SmapDisabler.cpp
         Arch/x86/common/Spinlock.cpp
@@ -443,6 +445,8 @@ else()
         ${AK_SOURCES}
         ${RPI_SOURCES}
 
+        Arch/Processor.cpp
+
         Arch/aarch64/boot.S
         Arch/aarch64/BootPPMParser.cpp
         Arch/aarch64/CrashHandler.cpp