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/*
* 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/Arch/i386/CPU.h>
#include <Kernel/Arch/i386/PIC.h>
#include <Kernel/InterruptHandler.h>
#include <Kernel/SharedInterruptHandler.h>
//#define INTERRUPT_DEBUG
SharedInterruptHandler& SharedInterruptHandler::from(u8 interrupt_number)
{
return get_interrupt_handler(interrupt_number);
}
void SharedInterruptHandler::initialize(u8 interrupt_number)
{
new SharedInterruptHandler(interrupt_number);
}
void SharedInterruptHandler::register_handler(InterruptHandler& handler)
{
#ifdef INTERRUPT_DEBUG
kprintf("Interrupt Handler registered @ Shared Interrupt Handler %d\n", m_interrupt_number);
#endif
m_handlers.set(&handler);
enable_interrupt_vector();
}
void SharedInterruptHandler::unregister_handler(InterruptHandler& handler)
{
#ifdef INTERRUPT_DEBUG
kprintf("Interrupt Handler unregistered @ Shared Interrupt Handler %d\n", m_interrupt_number);
#endif
m_handlers.remove(&handler);
if (m_handlers.is_empty())
disable_interrupt_vector();
}
SharedInterruptHandler::SharedInterruptHandler(u8 interrupt_number)
: m_interrupt_number(interrupt_number)
, m_enabled(true)
{
#ifdef INTERRUPT_DEBUG
kprintf("Shared Interrupt Handler registered @ %d\n", m_interrupt_number);
#endif
register_shared_interrupt_handler(m_interrupt_number, *this);
disable_interrupt_vector();
}
SharedInterruptHandler::~SharedInterruptHandler()
{
#ifdef INTERRUPT_DEBUG
kprintf("Shared Interrupt Handler unregistered @ %d\n", m_interrupt_number);
#endif
disable_interrupt_vector();
unregister_shared_interrupt_handler(m_interrupt_number, *this);
}
void SharedInterruptHandler::handle_interrupt()
{
#ifdef INTERRUPT_DEBUG
kprintf("Interrupt @ %d\n", m_interrupt_number);
kprintf("Interrupt Handlers registered - %d\n", m_handlers.size());
#endif
int i = 0;
for (auto* handler : m_handlers) {
#ifdef INTERRUPT_DEBUG
kprintf("Going for Interrupt Handling @ %d, Shared Interrupt %d\n", i, m_interrupt_number);
#endif
ASSERT(handler != nullptr);
if (handler->is_enabled())
handler->handle_interrupt();
#ifdef INTERRUPT_DEBUG
kprintf("Going for Interrupt Handling @ %d, Shared Interrupt %d - End\n", i, m_interrupt_number);
#endif
i++;
}
// FIXME: Determine if we use IRQs or MSIs (in the future) to send EOI...
}
void SharedInterruptHandler::enable_interrupt_vector()
{
if (m_enabled)
return;
m_enabled = true;
// FIXME: Determine if we use IRQs or MSIs (in the future) to enable the interrupt vector...
PIC::enable(m_interrupt_number);
}
void SharedInterruptHandler::disable_interrupt_vector()
{
if (!m_enabled)
return;
m_enabled = false;
// FIXME: Determine if we use IRQs or MSIs (in the future) to disable the interrupt vector...
PIC::disable(m_interrupt_number);
}
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