64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
/*
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* \brief IRQ root interface
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* \author Christian Helmuth
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* \author Alexander Boettcher
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* \date 2007-09-13
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*/
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/*
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* Copyright (C) 2007-2017 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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#ifndef _CORE__INCLUDE__IRQ_ROOT_H_
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#define _CORE__INCLUDE__IRQ_ROOT_H_
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#include <root/component.h>
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#include <irq_session_component.h>
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namespace Genode { class Irq_root; }
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class Genode::Irq_root : public Root_component<Irq_session_component>
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{
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private:
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/*
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* Use a dedicated entrypoint for IRQ session to decouple the interrupt
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* handling from other core services. If we used the same entrypoint, a
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* long-running operation (like allocating and clearing a dataspace
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* from the RAM service) would delay the response to time-critical
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* calls of the 'Irq_session::ack_irq' function.
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*/
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enum { STACK_SIZE = sizeof(long)*1024 };
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Rpc_entrypoint _session_ep;
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Range_allocator &_irq_alloc; /* platform irq allocator */
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protected:
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Irq_session_component *_create_session(const char *args) override {
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return new (md_alloc()) Irq_session_component(_irq_alloc, args); }
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public:
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/**
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* Constructor
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*
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* \param pd_session capability allocator
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* \param irq_alloc IRQ range that can be assigned to clients
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* \param md_alloc meta-data allocator to be used by root component
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*/
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Irq_root(Pd_session &pd_session,
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Range_allocator &irq_alloc, Allocator &md_alloc)
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:
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Root_component<Irq_session_component>(&_session_ep, &md_alloc),
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_session_ep(&pd_session, STACK_SIZE, "irq"),
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_irq_alloc(irq_alloc)
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{ }
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};
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#endif /* _CORE__INCLUDE__IRQ_ROOT_H_ */
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