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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/x86/CPU.h>
#include <Kernel/Assertions.h>
#include <Kernel/Interrupts/GenericInterruptHandler.h>
#include <Kernel/Interrupts/InterruptManagement.h>
#include <Kernel/Interrupts/PIC.h>
namespace Kernel {
GenericInterruptHandler& GenericInterruptHandler::from(u8 interrupt_number)
{
return get_interrupt_handler(interrupt_number);
}
GenericInterruptHandler::GenericInterruptHandler(u8 interrupt_number, bool disable_remap)
: m_interrupt_number(interrupt_number)
, m_disable_remap(disable_remap)
{
// NOTE: We cannot register or unregister the handler while the object
// is being constructed or deconstructed!
}
void GenericInterruptHandler::will_be_destroyed()
{
// This will be called for RefCounted interrupt handlers before the
// object is being destroyed. As soon as the destructor is invoked
// it is no longer advisable to unregister the handler (which causes
// calls to virtual functions), so let's do this right before
// invoking it
unregister_interrupt_handler();
}
void GenericInterruptHandler::register_interrupt_handler()
{
if (m_registered)
return;
if (m_disable_remap)
register_generic_interrupt_handler(m_interrupt_number, *this);
else
register_generic_interrupt_handler(InterruptManagement::acquire_mapped_interrupt_number(m_interrupt_number), *this);
m_registered = true;
}
void GenericInterruptHandler::unregister_interrupt_handler()
{
if (!m_registered)
return;
if (m_disable_remap)
unregister_generic_interrupt_handler(m_interrupt_number, *this);
else
unregister_generic_interrupt_handler(InterruptManagement::acquire_mapped_interrupt_number(m_interrupt_number), *this);
m_registered = false;
}
void GenericInterruptHandler::change_interrupt_number(u8 number)
{
VERIFY_INTERRUPTS_DISABLED();
VERIFY(!m_disable_remap);
if (m_registered) {
unregister_generic_interrupt_handler(InterruptManagement::acquire_mapped_interrupt_number(interrupt_number()), *this);
m_registered = false;
}
m_interrupt_number = number;
register_generic_interrupt_handler(InterruptManagement::acquire_mapped_interrupt_number(interrupt_number()), *this);
}
}
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