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base: factor out irq parsing into helper header

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to be used by sel4 in the next commit

Issue #2044
This commit is contained in:
Alexander Boettcher
2016-07-26 11:34:29 +02:00
committed by Christian Helmuth
parent 464181b01d
commit cb675a12d8
3 changed files with 93 additions and 84 deletions
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79
repos/base/src/core/include/irq_args.h Normal file
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/*
* \brief Utility to parse IRQ session arguments
* \author Alexander Boettcher
* \date 2016-07-20
*/
/*
* Copyright (C) 2016 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _CORE__INCLUDE__IRQ_ARGS_H_
#define _CORE__INCLUDE__IRQ_ARGS_H_
#include <base/log.h>
#include <util/arg_string.h>
#include <irq_session/irq_session.h>
namespace Genode { class Irq_args; }
class Genode::Irq_args
{
private:
Irq_session::Trigger _irq_trigger;
Irq_session::Polarity _irq_polarity;
long _irq_number;
public:
Irq_args(const char * args)
{
_irq_number = Arg_string::find_arg(args, "irq_number").long_value(-1);
long irq_trg = Arg_string::find_arg(args, "irq_trigger").long_value(-1);
long irq_pol = Arg_string::find_arg(args, "irq_polarity").long_value(-1);
switch (irq_trg) {
case -1:
case Irq_session::TRIGGER_UNCHANGED:
_irq_trigger = Irq_session::TRIGGER_UNCHANGED;
break;
case Irq_session::TRIGGER_EDGE:
_irq_trigger = Irq_session::TRIGGER_EDGE;
break;
case Irq_session::TRIGGER_LEVEL:
_irq_trigger = Irq_session::TRIGGER_LEVEL;
break;
default:
error("invalid trigger mode ", irq_trg, " specified for IRQ ",
_irq_number);
throw Root::Unavailable();
}
switch (irq_pol) {
case -1:
case Irq_session::POLARITY_UNCHANGED:
_irq_polarity = Irq_session::POLARITY_UNCHANGED;
break;
case Irq_session::POLARITY_HIGH:
_irq_polarity = Irq_session::POLARITY_HIGH;
break;
case Irq_session::POLARITY_LOW:
_irq_polarity = Irq_session::POLARITY_LOW;
break;
default:
error("invalid polarity ", irq_pol, " specified for IRQ ",
_irq_number);
throw Root::Unavailable();
}
}
long irq_number() const { return _irq_number; }
Irq_session::Trigger trigger() const { return _irq_trigger; }
Irq_session::Polarity polarity() const { return _irq_polarity; }
};
#endif /* _CORE__INCLUDE__IRQ_ARGS_H_ */