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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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#include <Kernel/Arch/i386/CPU.h>
28#include <Kernel/Interrupts/IRQHandler.h>
29#include <Kernel/Interrupts/InterruptManagement.h>
30
31//#define IRQ_DEBUG
32
33namespace Kernel {
34
35IRQHandler::IRQHandler(u8 irq)
36 : GenericInterruptHandler(irq)
37 , m_responsible_irq_controller(InterruptManagement::the().get_responsible_irq_controller(irq))
38{
39 disable_irq();
40}
41
42IRQHandler::~IRQHandler()
43{
44}
45
46bool IRQHandler::eoi()
47{
48#ifdef IRQ_DEBUG
49 dbg() << "EOI IRQ " << interrupt_number();
50#endif
51 if (!m_shared_with_others) {
52 ASSERT(!m_responsible_irq_controller.is_null());
53 m_responsible_irq_controller->eoi(*this);
54 return true;
55 }
56 return false;
57}
58
59void IRQHandler::enable_irq()
60{
61#ifdef IRQ_DEBUG
62 dbg() << "Enable IRQ " << interrupt_number();
63#endif
64 m_enabled = true;
65 if (!m_shared_with_others)
66 m_responsible_irq_controller->enable(*this);
67}
68
69void IRQHandler::disable_irq()
70{
71#ifdef IRQ_DEBUG
72 dbg() << "Disable IRQ " << interrupt_number();
73#endif
74 m_enabled = false;
75 if (!m_shared_with_others)
76 m_responsible_irq_controller->disable(*this);
77}
78
79void IRQHandler::change_irq_number(u8 irq)
80{
81 InterruptDisabler disabler;
82 change_interrupt_number(irq);
83 m_responsible_irq_controller = InterruptManagement::the().get_responsible_irq_controller(irq);
84}
85
86}