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Serenity Operating System
1/*
2 * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <AK/Types.h>
30#include <Kernel/Arch/i386/CPU.h>
31#include <Kernel/Interrupts/GenericInterruptHandler.h>
32#include <Kernel/PCI/Definitions.h>
33
34namespace Kernel {
35
36class MSIHandler : public GenericInterruptHandler {
37public:
38 virtual ~MSIHandler();
39
40 virtual void handle_interrupt(RegisterState&) override {}
41
42 void enable_irq();
43 void disable_irq();
44
45 virtual bool eoi() override;
46
47 virtual size_t sharing_devices_count() const override { return 0; }
48 virtual bool is_shared_handler() const override { return false; }
49 virtual bool is_sharing_with_others() const override { return m_shared_with_others; }
50
51protected:
52 void change_irq_number(u8 irq);
53 explicit MSIHandler(PCI::Address);
54
55private:
56 bool m_shared_with_others;
57 bool m_enabled;
58};
59}