105 lines
2.2 KiB
C++
105 lines
2.2 KiB
C++
/*
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* \brief IRQ handling utility
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* \author Christian Helmuth
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* \date 2011-05-19
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*/
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/*
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* Copyright (C) 2011-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__OS__IRQ_ACTIVATION_H_
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#define _INCLUDE__OS__IRQ_ACTIVATION_H_
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#include <base/thread.h>
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#include <base/snprintf.h>
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#include <irq_session/connection.h>
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namespace Genode {
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struct Irq_handler;
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struct Irq_activation;
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}
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struct Genode::Irq_handler
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{
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/**
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* Called by IRQ activation on interrupt
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*/
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virtual void handle_irq(int irq_number) = 0;
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};
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/**
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* Thread activated by IRQ
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*/
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class Genode::Irq_activation : Thread_base
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{
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private:
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int _number;
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Irq_connection _connection;
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Irq_handler &_handler;
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char _thread_name[8];
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Genode::Signal_receiver _sig_rec;
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Genode::Signal_dispatcher<Irq_activation> _dispatcher;
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char const *_create_thread_name(unsigned irq_number)
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{
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snprintf(_thread_name, sizeof(_thread_name), "irq.%02x", irq_number);
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return _thread_name;
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}
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void _handle(unsigned)
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{
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_connection.ack_irq();
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_handler.handle_irq(_number);
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}
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public:
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/**
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* Constructor
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*
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* \param irq_number interrupt number
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* \param handler interrupt handler
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* \param stack_size size of stack or interrupt thread
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*/
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Irq_activation(int irq_number, Irq_handler &handler, size_t stack_size)
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:
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Thread_base(0, _create_thread_name(irq_number), stack_size),
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_number(irq_number), _connection(irq_number), _handler(handler),
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_dispatcher(_sig_rec, *this, &Irq_activation::_handle)
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{
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start();
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_connection.sigh(_dispatcher);
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_connection.ack_irq();
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}
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/**
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* Thread entry
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*
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* The interrupt thread infinitely waits for interrupts signals and
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* dispatches the handler on occurrence.
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*/
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void entry()
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{
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while (true) {
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Genode::Signal sig = _sig_rec.wait_for_signal();
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int num = sig.num();
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Genode::Signal_dispatcher_base *dispatcher;
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dispatcher = dynamic_cast<Genode::Signal_dispatcher_base *>(sig.context());
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dispatcher->dispatch(num);
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}
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}
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};
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#endif /* _INCLUDE__OS__IRQ_ACTIVATION_H_ */
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