71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
/*
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* \brief Implementation of IRQ session component
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* \author Martin Stein
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* \date 2012-02-12
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*/
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/*
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* Copyright (C) 2012-2013 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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/* Genode includes */
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#include <kernel/syscalls.h>
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/* core includes */
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#include <irq_root.h>
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using namespace Genode;
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bool
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Irq_session_component::Irq_control_component::associate_to_irq(unsigned irq)
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{ return Kernel::allocate_irq(irq); }
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void Irq_session_component::wait_for_irq() { Kernel::await_irq(); }
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Irq_session_component::~Irq_session_component()
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{
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/* free IRQ for other threads */
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if (Kernel::free_irq(_irq_number))
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PERR("Could not free IRQ %u", _irq_number);
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}
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Irq_session_component::Irq_session_component(Cap_session * cap_session,
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Range_allocator * irq_alloc,
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const char * args)
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:
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_irq_alloc(irq_alloc), _ep(cap_session, STACK_SIZE, "irqctrl"),
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_control_cap(_ep.manage(&_control_component)),
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_control_client(_control_cap)
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{
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/* check arguments */
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bool shared = Arg_string::find_arg(args, "irq_shared").bool_value(false);
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if (shared) {
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PERR("IRQ sharing not supported");
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throw Root::Invalid_args();
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}
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/* allocate IRQ */
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long irq_number = Arg_string::find_arg(args, "irq_number").long_value(-1);
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if (irq_number < 0 || !irq_alloc ||
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irq_alloc->alloc_addr(1, irq_number).is_error())
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{
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PERR("Unavailable IRQ %lu requested", irq_number);
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throw Root::Invalid_args();
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}
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_irq_number = irq_number;
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/* configure control client */
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if (!_control_client.associate_to_irq(irq_number)) {
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PERR("IRQ association failed");
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throw Root::Invalid_args();
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}
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/* create IRQ capability */
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_irq_cap = Irq_session_capability(_ep.manage(this));
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}
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