Kernel: Add SpuriousInterruptHandler class

This type of interrupt handler should handle spurious IRQs.

Kernel/Interrupts/SpuriousInterruptHandler.cpp

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/Interrupts/InterruptManagement.h>
+#include <Kernel/Interrupts/SpuriousInterruptHandler.h>
+
+namespace Kernel {
+
+void SpuriousInterruptHandler::initialize(u8 interrupt_number)
+{
+    new SpuriousInterruptHandler(interrupt_number);
+}
+
+void SpuriousInterruptHandler::register_handler(GenericInterruptHandler&)
+{
+}
+void SpuriousInterruptHandler::unregister_handler(GenericInterruptHandler&)
+{
+}
+
+bool SpuriousInterruptHandler::eoi()
+{
+    // FIXME: Actually check if IRQ7 or IRQ15 are spurious, and if not, call EOI with the correct interrupt number.
+    if (interrupt_number() == 15)
+        InterruptManagement::the().eoi(7);
+    return false;
+}
+
+SpuriousInterruptHandler::SpuriousInterruptHandler(u8 irq)
+    : GenericInterruptHandler(irq)
+{
+}
+
+SpuriousInterruptHandler::~SpuriousInterruptHandler()
+{
+}
+
+void SpuriousInterruptHandler::handle_interrupt(RegisterState&)
+{
+    // FIXME: Actually check if IRQ7 or IRQ15 are spurious, and if not, call the real handler to handle the IRQ.
+    kprintf("Spurious Interrupt, vector %d\n", interrupt_number());
+}
+
+void SpuriousInterruptHandler::enable_interrupt_vector()
+{
+    if (m_enabled)
+        return;
+    m_enabled = true;
+    InterruptManagement::the().enable(interrupt_number());
+}
+
+void SpuriousInterruptHandler::disable_interrupt_vector()
+{
+    if (!m_enabled)
+        return;
+    m_enabled = false;
+    InterruptManagement::the().disable(interrupt_number());
+}
+
+}

Kernel/Interrupts/SpuriousInterruptHandler.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/HashTable.h>
+#include <AK/OwnPtr.h>
+#include <AK/Types.h>
+#include <Kernel/Arch/i386/CPU.h>
+#include <Kernel/Interrupts/GenericInterruptHandler.h>
+
+namespace Kernel {
+
+class SpuriousInterruptHandler final : public GenericInterruptHandler {
+public:
+    static void initialize(u8 interrupt_number);
+    virtual ~SpuriousInterruptHandler();
+    virtual void handle_interrupt(RegisterState& regs) override;
+
+    void register_handler(GenericInterruptHandler&);
+    void unregister_handler(GenericInterruptHandler&);
+
+    virtual bool eoi() override;
+
+    virtual size_t sharing_devices_count() const override { return 1; }
+    virtual bool is_shared_handler() const override { return false; }
+    virtual bool is_sharing_with_others() const override { return false; }
+
+    virtual HandlerPurpose purpose() const override { return HandlerPurpose::SpuriousInterruptHandler; }
+
+private:
+    void enable_interrupt_vector();
+    void disable_interrupt_vector();
+    explicit SpuriousInterruptHandler(u8 interrupt_number);
+    bool m_enabled;
+    OwnPtr<GenericInterruptHandler> m_real_handler;
+};
+}

Kernel/Makefile

@@ -19,6 +19,7 @@ OBJS = \
     Interrupts/PIC.o \
     Interrupts/GenericInterruptHandler.o \
     Interrupts/UnhandledInterruptHandler.o \
+    Interrupts/SpuriousInterruptHandler.o \
     Interrupts/IRQHandler.o \
     Interrupts/SharedIRQHandler.o \
     CMOS.o \