182 lines
4.1 KiB
C++
182 lines
4.1 KiB
C++
/*
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* \brief Component bootstrap
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* \author Norman Feske
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* \author Christian Helmuth
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* \date 2016-01-13
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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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/* Genode includes */
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#include <base/component.h>
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#include <base/connection.h>
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#include <base/service.h>
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#include <base/env.h>
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/* base-internal includes */
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#include <base/internal/globals.h>
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/*
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* XXX remove this pointer once 'Env_deprecated' is removed
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*/
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static Genode::Env *env_ptr = nullptr;
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namespace {
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using namespace Genode;
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struct Env : Genode::Env
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{
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Genode::Entrypoint &_ep;
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Genode::Parent &_parent = *env_deprecated()->parent();
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/**
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* Lock for serializing 'session' and 'close'
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*/
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Genode::Lock _lock;
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/**
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* Utility to used block for single signal
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*/
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struct Blockade
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{
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Parent &_parent;
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Genode::Signal_receiver _sig_rec;
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Genode::Signal_context _sig_ctx;
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Blockade(Parent &parent) : _parent(parent)
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{
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_parent.session_sigh(_sig_rec.manage(&_sig_ctx));
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}
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void block() { _sig_rec.wait_for_signal(); }
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};
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Constructible<Blockade> _session_blockade;
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Env(Genode::Entrypoint &ep) : _ep(ep) { env_ptr = this; }
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Genode::Parent &parent() override { return _parent; }
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Genode::Ram_session &ram() override { return *Genode::env_deprecated()->ram_session(); }
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Genode::Cpu_session &cpu() override { return *Genode::env_deprecated()->cpu_session(); }
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Genode::Region_map &rm() override { return *Genode::env_deprecated()->rm_session(); }
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Genode::Pd_session &pd() override { return *Genode::env_deprecated()->pd_session(); }
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Genode::Entrypoint &ep() override { return _ep; }
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Genode::Ram_session_capability ram_session_cap() override
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{
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return Genode::env_deprecated()->ram_session_cap();
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}
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Genode::Cpu_session_capability cpu_session_cap() override
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{
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return Genode::env_deprecated()->cpu_session_cap();
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}
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Genode::Pd_session_capability pd_session_cap() override
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{
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return Genode::env_deprecated()->pd_session_cap();
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}
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Genode::Id_space<Parent::Client> &id_space() override
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{
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return Genode::env_session_id_space();
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}
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void _block_for_session()
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{
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/*
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* Construct blockade lazily be avoid it being used in core where
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* all session requests are immediately answered.
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*/
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if (!_session_blockade.constructed())
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_session_blockade.construct(_parent);
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_session_blockade->block();
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}
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Session_capability session(Parent::Service_name const &name,
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Parent::Client::Id id,
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Parent::Session_args const &args,
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Affinity const &affinity) override
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{
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Lock::Guard guard(_lock);
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Session_capability cap = _parent.session(id, name, args, affinity);
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if (cap.valid())
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return cap;
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_block_for_session();
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return _parent.session_cap(id);
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}
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void upgrade(Parent::Client::Id id, Parent::Upgrade_args const &args) override
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{
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Lock::Guard guard(_lock);
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if (_parent.upgrade(id, args) == Parent::UPGRADE_PENDING)
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_block_for_session();
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}
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void close(Parent::Client::Id id) override
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{
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Lock::Guard guard(_lock);
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if (_parent.close(id) == Parent::CLOSE_PENDING)
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_block_for_session();
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}
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};
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}
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namespace Genode {
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struct Startup;
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extern void bootstrap_component();
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Env &internal_env()
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{
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class Env_ptr_not_initialized { };
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if (!env_ptr)
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throw Env_ptr_not_initialized();
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return *env_ptr;
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}
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}
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Genode::size_t Component::stack_size() __attribute__((weak));
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Genode::size_t Component::stack_size() { return 64*1024; }
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/*
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* We need to execute the constructor of the main entrypoint from a
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* class called 'Startup' as 'Startup' is a friend of 'Entrypoint'.
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*/
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struct Genode::Startup
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{
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::Env env { ep };
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bool const exception_handling = (init_exception_handling(env), true);
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/*
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* The construction of the main entrypoint does never return.
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*/
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Entrypoint ep { env };
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};
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void Genode::bootstrap_component()
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{
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static Startup startup;
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/* never reached */
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}
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