75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
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/*
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* \brief Implementation of IRQ session component
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* \author Norman Feske
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* \author Sebastian Sumpf
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* \date 2009-10-02
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*/
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/*
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* Copyright (C) 2009-2011 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 <base/printf.h>
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/* core includes */
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#include <irq_root.h>
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#include <platform.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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#include <nova_util.h>
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using namespace Genode;
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void Irq_session_component::wait_for_irq()
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{
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Nova::sm_ctrl(_irq_number, Nova::SEMAPHORE_DOWN);
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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),
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_ep(cap_session, STACK_SIZE, "irq")
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{
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long irq_number = Arg_string::find_arg(args, "irq_number").long_value(-1);
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if (irq_number == -1 || !irq_alloc ||
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irq_alloc->alloc_addr(1, irq_number) != Range_allocator::ALLOC_OK) {
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PERR("Unavailable IRQ %lx requested", irq_number);
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throw Root::Invalid_args();
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}
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/* alloc slector where IRQ will be mapped */
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_irq_number = cap_selector_allocator()->alloc();
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/* since we run in APIC mode translate IRQ 0 (PIT) to 2 */
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if (!irq_number)
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irq_number = 2;
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/* map IRQ number to selector */
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int ret = map_local((Nova::Utcb *)Thread_base::myself()->utcb(),
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Nova::Obj_crd(platform_specific()->gsi_base_sel() + irq_number, 0),
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Nova::Obj_crd(_irq_number, 0),
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true);
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if (ret) {
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PERR("Could not map IRQ %d", _irq_number);
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throw Root::Unavailable();
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}
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/* assign IRQ to CPU */
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enum { CPU = 0 };
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Nova::assign_gsi(_irq_number, 0, CPU);
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/* initialize capability */
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_irq_cap = _ep.manage(this);
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}
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Irq_session_component::~Irq_session_component() { }
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