78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
/*
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* \brief Backend for IRQ sessions served by core
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* \author Martin Stein
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* \author Reto Buerki
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* \date 2012-02-12
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*/
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/*
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* Copyright (C) 2012-2015 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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/* base-hw includes */
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#include <kernel/core_interface.h>
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/* core includes */
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#include <kernel/irq.h>
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#include <irq_root.h>
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#include <core_env.h>
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using namespace Genode;
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unsigned Irq_session_component::_find_irq_number(const char * const args)
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{
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return Arg_string::find_arg(args, "irq_number").long_value(-1);
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}
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void Irq_session_component::ack_irq()
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{
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using Kernel::User_irq;
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if (!_sig_cap.valid()) { return; }
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User_irq * const kirq = reinterpret_cast<User_irq*>(&_kernel_object);
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Kernel::ack_irq(kirq);
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}
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void Irq_session_component::sigh(Signal_context_capability cap)
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{
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if (_sig_cap.valid()) {
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PWRN("signal handler already registered for IRQ %u", _irq_number);
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return;
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}
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_sig_cap = cap;
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if (Kernel::new_irq((addr_t)&_kernel_object, _irq_number, _sig_cap.dst()))
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PWRN("invalid signal handler for IRQ %u", _irq_number);
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}
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Irq_session_component::~Irq_session_component()
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{
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using namespace Kernel;
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User_irq * kirq = reinterpret_cast<User_irq*>(&_kernel_object);
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_irq_alloc->free((void *)(addr_t)static_cast<Kernel::Irq*>(kirq)->id());
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if (_sig_cap.valid())
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Kernel::delete_irq(kirq);
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}
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Irq_session_component::Irq_session_component(Range_allocator * const irq_alloc,
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const char * const args)
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:
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_irq_number(Platform::irq(_find_irq_number(args))),
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_irq_alloc(irq_alloc)
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{
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/* allocate interrupt */
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if (_irq_alloc->alloc_addr(1, _irq_number).is_error()) {
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PERR("unavailable interrupt requested");
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throw Root::Invalid_args();
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}
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}
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