90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
/*
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* \brief Implementation of the SIGNAL interface
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* \author Alexander Boettcher
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* \date 2016-07-09
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*/
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/*
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* Copyright (C) 2016-2017 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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/* Genode includes */
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#include <base/log.h>
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/* core includes */
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#include <platform.h>
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#include <signal_source_component.h>
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/* base-internal include */
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#include <core_capability_space.h>
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using namespace Genode;
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/*****************************
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** Signal-source component **
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*****************************/
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void Signal_source_component::release(Signal_context_component &context)
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{
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if (context.enqueued())
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_signal_queue.remove(context);
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}
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void Signal_source_component::submit(Signal_context_component &context,
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unsigned long cnt)
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{
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/*
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* If the client does not block in 'wait_for_signal', the
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* signal will be delivered as result of the next
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* 'wait_for_signal' call.
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*/
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context.increment_signal_cnt(cnt);
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if (context.enqueued())
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return;
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_signal_queue.enqueue(context);
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seL4_Signal(Capability_space::ipc_cap_data(_notify).sel.value());
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}
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Signal_source::Signal Signal_source_component::wait_for_signal()
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{
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Signal result(0, 0); /* just a dummy in the case of no signal pending */
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/* dequeue and return pending signal */
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_signal_queue.dequeue([&result] (Signal_context_component &context) {
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result = Signal(context.imprint(), context.cnt());
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context.reset_signal_cnt();
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});
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return result;
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}
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Signal_source_component::Signal_source_component(Rpc_entrypoint &ep)
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:
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_entrypoint(ep)
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{
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Platform &platform = platform_specific();
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Range_allocator &phys_alloc = platform.ram_alloc();
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addr_t const phys_addr = Untyped_memory::alloc_page(phys_alloc);
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seL4_Untyped const service = Untyped_memory::untyped_sel(phys_addr).value();
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/* allocate notification object within core's CNode */
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Cap_sel ny_sel = platform.core_sel_alloc().alloc();
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create<Notification_kobj>(service, platform.core_cnode().sel(), ny_sel);
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_notify = Capability_space::create_notification_cap(ny_sel);
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}
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Signal_source_component::~Signal_source_component() { }
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