Kernel: Add MSIHandler class

This is a stub for now, since we don't support Message Signaled
Interrupts yet.

1 files changed, 59 insertions, 0 deletions

diff --git a/Kernel/Interrupts/MSIHandler.h b/Kernel/Interrupts/MSIHandler.h
new file mode 100644
index 0000000000..2409e9b6a5
--- /dev/null
+++ b/Kernel/Interrupts/MSIHandler.h
@@ -0,0 +1,59 @@
+/*
+ * 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/Types.h>
+#include <Kernel/Arch/i386/CPU.h>
+#include <Kernel/Interrupts/GenericInterruptHandler.h>
+#include <Kernel/PCI/Definitions.h>
+
+namespace Kernel {
+
+class MSIHandler : public GenericInterruptHandler {
+public:
+    virtual ~MSIHandler();
+
+    virtual void handle_interrupt(RegisterState&) override {}
+
+    void enable_irq();
+    void disable_irq();
+
+    virtual bool eoi() override;
+
+    virtual size_t get_sharing_devices_count() const override { return 0; }
+    virtual bool is_shared_handler() const override { return false; }
+    virtual bool is_sharing_with_others() const override { return m_shared_with_others; }
+
+protected:
+    void change_irq_number(u8 irq);
+    explicit MSIHandler(PCI::Address);
+
+private:
+    bool m_shared_with_others;
+    bool m_enabled;
+};
+}