136 lines
3.6 KiB
C++
136 lines
3.6 KiB
C++
/*
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* \brief NOVA-specific signal-delivery mechanism
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* \author Norman Feske
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* \date 2016-01-04
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*/
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/*
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* Copyright (C) 2016 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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#ifndef _CORE__INCLUDE__SIGNAL_BROKER_H_
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#define _CORE__INCLUDE__SIGNAL_BROKER_H_
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/* Genode includes */
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#include <base/tslab.h>
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/* core-local includes */
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#include <signal_source_component.h>
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#include <signal_source/capability.h>
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namespace Genode { class Signal_broker; }
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class Genode::Signal_broker
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{
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private:
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Allocator &_md_alloc;
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Rpc_entrypoint &_source_ep;
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Object_pool<Signal_context_component> _obj_pool;
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Rpc_entrypoint &_context_ep;
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Signal_source_component _source;
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Signal_source_capability _source_cap;
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Tslab<Signal_context_component,
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960*sizeof(long)> _contexts_slab { &_md_alloc };
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public:
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class Invalid_signal_source : public Exception { };
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Signal_broker(Allocator &md_alloc,
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Rpc_entrypoint &source_ep,
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Rpc_entrypoint &context_ep)
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:
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_md_alloc(md_alloc),
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_source_ep(source_ep),
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_context_ep(context_ep),
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_source(&_context_ep),
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_source_cap(_source_ep.manage(&_source))
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{ }
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~Signal_broker()
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{
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/* remove source from entrypoint */
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_source_ep.dissolve(&_source);
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/* free all signal contexts */
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while (Signal_context_component *r = _contexts_slab.first_object())
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free_context(reinterpret_cap_cast<Signal_context>(r->cap()));
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}
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Signal_source_capability alloc_signal_source() { return _source_cap; }
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void free_signal_source(Signal_source_capability) { }
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/*
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* \throw Allocator::Out_of_memory
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*/
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Signal_context_capability
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alloc_context(Signal_source_capability, unsigned long imprint)
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{
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/*
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* XXX For now, we ignore the signal-source argument as we
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* create only a single receiver for each PD.
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*/
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Native_capability sm = _source.blocking_semaphore();
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if (!sm.valid()) {
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PWRN("signal receiver sm is not valid");
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for (;;);
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return Signal_context_capability();
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}
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Native_capability si(cap_map()->insert());
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Signal_context_capability cap = reinterpret_cap_cast<Signal_context>(si);
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uint8_t res = Nova::create_si(cap.local_name(), __core_pd_sel, imprint,
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sm.local_name());
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if (res != Nova::NOVA_OK) {
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PWRN("creating signal failed - error %u", res);
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return Signal_context_capability();
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}
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/* the _contexts_slab may throw Allocator::Out_of_memory */
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_obj_pool.insert(new (&_contexts_slab) Signal_context_component(cap));
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/* return unique capability for the signal context */
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return cap;
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}
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void free_context(Signal_context_capability context_cap)
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{
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Signal_context_component *context;
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auto lambda = [&] (Signal_context_component *c) {
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context = c;
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if (context) _obj_pool.remove(context);
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};
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_obj_pool.apply(context_cap, lambda);
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if (!context) {
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PWRN("%p - specified signal-context capability has wrong type %lx",
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this, context_cap.local_name());
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return;
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}
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destroy(&_contexts_slab, context);
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Nova::revoke(Nova::Obj_crd(context_cap.local_name(), 0));
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cap_map()->remove(context_cap.local_name(), 0);
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}
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void submit(Signal_context_capability cap, unsigned cnt)
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{
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/*
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* On NOVA, signals are submitted directly to the kernel, not
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* by using core as a proxy.
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*/
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ASSERT_NEVER_CALLED;
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}
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};
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#endif /* _CORE__INCLUDE__SIGNAL_BROKER_H_ */
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