97 lines
2.3 KiB
C++
97 lines
2.3 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) 2012-2017 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 Affero General Public License version 3.
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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 <irq_args.h>
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#include <core_env.h>
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/* base-internal includes */
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#include <base/internal/capability_space.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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warning("signal handler already registered for IRQ ", _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,
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Capability_space::capid(_sig_cap)))
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warning("invalid signal handler for IRQ ", _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)_irq_number);
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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 &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))), _irq_alloc(irq_alloc),
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_is_msi(false), _address(0), _value(0)
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{
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const long mmconf =
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Arg_string::find_arg(args, "device_config_phys").long_value(0);
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if (mmconf) {
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_is_msi =
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Platform::get_msi_params(mmconf, _address, _value, _irq_number);
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if (!_is_msi)
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throw Service_denied();
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}
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/* allocate interrupt */
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if (_irq_alloc.alloc_addr(1, _irq_number).error()) {
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error("unavailable interrupt ", _irq_number, " requested");
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throw Service_denied();
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}
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Irq_args const irq_args(args);
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Kernel::irq_mode(_irq_number, irq_args.trigger(), irq_args.polarity());
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}
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