From c959344c00e1b68d95cf57e5ed7b05259359d99b Mon Sep 17 00:00:00 2001
From: Timon Kruiper <timonkruiper@gmail.com>
Date: Mon, 30 May 2022 09:43:51 +0200
Subject: [PATCH] Kernel: Add simple implementation for InterruptManagement on
 aarch64

This class currently hardcodes the use of the Raspberry Pi interrupt
controller.
---
 Kernel/Arch/aarch64/Dummy.cpp               | 21 --------
 Kernel/Arch/aarch64/InterruptManagement.cpp | 57 +++++++++++++++++++++
 Kernel/Arch/aarch64/InterruptManagement.h   | 11 ++++
 Kernel/CMakeLists.txt                       |  1 +
 4 files changed, 69 insertions(+), 21 deletions(-)
 create mode 100644 Kernel/Arch/aarch64/InterruptManagement.cpp

diff --git a/Kernel/Arch/aarch64/Dummy.cpp b/Kernel/Arch/aarch64/Dummy.cpp
index 07dda5445a..ec9a1b117e 100644
--- a/Kernel/Arch/aarch64/Dummy.cpp
+++ b/Kernel/Arch/aarch64/Dummy.cpp
@@ -7,7 +7,6 @@
 #include <AK/Singleton.h>
 #include <AK/Types.h>
 
-#include <Kernel/Arch/aarch64/InterruptManagement.h>
 #include <Kernel/FileSystem/Inode.h>
 #include <Kernel/KString.h>
 #include <Kernel/Locking/SpinlockProtected.h>
@@ -137,23 +136,3 @@ void KString::operator delete(void*)
 extern "C" {
 FlatPtr kernel_mapping_base;
 }
-
-// InterruptManagement.cpp
-namespace Kernel {
-
-u8 InterruptManagement::acquire_mapped_interrupt_number(u8)
-{
-    VERIFY_NOT_REACHED();
-}
-
-InterruptManagement& InterruptManagement::the()
-{
-    VERIFY_NOT_REACHED();
-}
-
-RefPtr<IRQController> InterruptManagement::get_responsible_irq_controller(u8)
-{
-    VERIFY_NOT_REACHED();
-}
-
-}
diff --git a/Kernel/Arch/aarch64/InterruptManagement.cpp b/Kernel/Arch/aarch64/InterruptManagement.cpp
new file mode 100644
index 0000000000..500d90fda9
--- /dev/null
+++ b/Kernel/Arch/aarch64/InterruptManagement.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ * Copyright (c) 2022, Timon Kruiper <timonkruiper@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Arch/aarch64/InterruptManagement.h>
+#include <Kernel/Arch/aarch64/RPi/InterruptController.h>
+
+namespace Kernel {
+
+static InterruptManagement* s_interrupt_management;
+
+bool InterruptManagement::initialized()
+{
+    return s_interrupt_management != nullptr;
+}
+
+InterruptManagement& InterruptManagement::the()
+{
+    VERIFY(InterruptManagement::initialized());
+    return *s_interrupt_management;
+}
+
+void InterruptManagement::initialize()
+{
+    VERIFY(!InterruptManagement::initialized());
+    s_interrupt_management = new InterruptManagement;
+
+    the().find_controllers();
+}
+
+void InterruptManagement::find_controllers()
+{
+    // TODO: Once device tree support is in place, find interrupt controllers using that.
+    m_interrupt_controllers.append(new RPi::InterruptController);
+}
+
+u8 InterruptManagement::acquire_mapped_interrupt_number(u8 interrupt_number)
+{
+    return interrupt_number;
+}
+
+Vector<RefPtr<IRQController>> const& InterruptManagement::controllers()
+{
+    return m_interrupt_controllers;
+}
+
+RefPtr<IRQController> InterruptManagement::get_responsible_irq_controller(u8)
+{
+    // TODO: Support more interrupt controllers
+    VERIFY(m_interrupt_controllers.size() == 1);
+    return m_interrupt_controllers[0];
+}
+
+}
diff --git a/Kernel/Arch/aarch64/InterruptManagement.h b/Kernel/Arch/aarch64/InterruptManagement.h
index 6c80429e67..775d8464b0 100644
--- a/Kernel/Arch/aarch64/InterruptManagement.h
+++ b/Kernel/Arch/aarch64/InterruptManagement.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include <AK/RefPtr.h>
+#include <AK/Vector.h>
 #include <Kernel/Arch/aarch64/IRQController.h>
 
 namespace Kernel {
@@ -13,10 +15,19 @@ namespace Kernel {
 class InterruptManagement {
 public:
     static InterruptManagement& the();
+    static void initialize();
+    static bool initialized();
 
     static u8 acquire_mapped_interrupt_number(u8 original_irq);
 
+    Vector<RefPtr<IRQController>> const& controllers();
     RefPtr<IRQController> get_responsible_irq_controller(u8 interrupt_vector);
+
+private:
+    InterruptManagement() = default;
+    void find_controllers();
+
+    Vector<RefPtr<IRQController>> m_interrupt_controllers;
 };
 
 }
diff --git a/Kernel/CMakeLists.txt b/Kernel/CMakeLists.txt
index a5a7c79b50..2e52cea77c 100644
--- a/Kernel/CMakeLists.txt
+++ b/Kernel/CMakeLists.txt
@@ -417,6 +417,7 @@ else()
         Arch/aarch64/Dummy.cpp
         Arch/aarch64/Exceptions.cpp
         Arch/aarch64/init.cpp
+        Arch/aarch64/InterruptManagement.cpp
         Arch/aarch64/Interrupts.cpp
         Arch/aarch64/kprintf.cpp
         Arch/aarch64/MainIdRegister.cpp