jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/Arch/InterruptManagement.h>
8#include <Kernel/Assertions.h>
9#include <Kernel/Debug.h>
10#include <Kernel/Interrupts/IRQHandler.h>
11#include <Kernel/Interrupts/SharedIRQHandler.h>
12#include <Kernel/Sections.h>
13
14namespace Kernel {
15
16UNMAP_AFTER_INIT void SharedIRQHandler::initialize(u8 interrupt_number)
17{
18 auto* handler = new SharedIRQHandler(interrupt_number);
19 handler->register_interrupt_handler();
20 handler->disable_interrupt_vector();
21}
22
23void SharedIRQHandler::register_handler(GenericInterruptHandler& handler)
24{
25 dbgln_if(INTERRUPT_DEBUG, "Interrupt Handler registered @ Shared Interrupt Handler {}", interrupt_number());
26 m_handlers.append(handler);
27 enable_interrupt_vector();
28}
29void SharedIRQHandler::unregister_handler(GenericInterruptHandler& handler)
30{
31 dbgln_if(INTERRUPT_DEBUG, "Interrupt Handler unregistered @ Shared Interrupt Handler {}", interrupt_number());
32 m_handlers.remove(handler);
33 if (m_handlers.is_empty())
34 disable_interrupt_vector();
35}
36
37bool SharedIRQHandler::eoi()
38{
39 dbgln_if(INTERRUPT_DEBUG, "EOI IRQ {}", interrupt_number());
40 m_responsible_irq_controller->eoi(*this);
41 return true;
42}
43
44void SharedIRQHandler::enumerate_handlers(Function<void(GenericInterruptHandler&)>& callback)
45{
46 for (auto& handler : m_handlers) {
47 callback(handler);
48 }
49}
50
51SharedIRQHandler::SharedIRQHandler(u8 irq)
52 : GenericInterruptHandler(irq)
53 , m_responsible_irq_controller(InterruptManagement::the().get_responsible_irq_controller(irq))
54{
55 dbgln_if(INTERRUPT_DEBUG, "Shared Interrupt Handler registered @ {}", interrupt_number());
56}
57
58SharedIRQHandler::~SharedIRQHandler()
59{
60 dbgln_if(INTERRUPT_DEBUG, "Shared Interrupt Handler unregistered @ {}", interrupt_number());
61 disable_interrupt_vector();
62}
63
64bool SharedIRQHandler::handle_interrupt(RegisterState const& regs)
65{
66 VERIFY_INTERRUPTS_DISABLED();
67
68 if constexpr (INTERRUPT_DEBUG) {
69 dbgln("Interrupt @ {}", interrupt_number());
70 dbgln("Interrupt Handlers registered - {}", m_handlers.size_slow());
71 }
72 int i = 0;
73 bool was_handled = false;
74 for (auto& handler : m_handlers) {
75 dbgln_if(INTERRUPT_DEBUG, "Going for Interrupt Handling @ {}, Shared Interrupt {}", i, interrupt_number());
76 if (handler.handle_interrupt(regs)) {
77 handler.increment_call_count();
78 was_handled = true;
79 }
80 dbgln_if(INTERRUPT_DEBUG, "Going for Interrupt Handling @ {}, Shared Interrupt {} - End", i, interrupt_number());
81 i++;
82 }
83 return was_handled;
84}
85
86void SharedIRQHandler::enable_interrupt_vector()
87{
88 if (m_enabled)
89 return;
90 m_enabled = true;
91 m_responsible_irq_controller->enable(*this);
92}
93
94void SharedIRQHandler::disable_interrupt_vector()
95{
96 if (!m_enabled)
97 return;
98 m_enabled = false;
99 m_responsible_irq_controller->disable(*this);
100}
101
102}