143 lines
3.0 KiB
C++
143 lines
3.0 KiB
C++
/*
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* \brief ROM prefetching service
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* \author Norman Feske
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* \date 2011-01-24
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*/
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/*
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* Copyright (C) 2011-2016 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 <root/component.h>
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#include <base/component.h>
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#include <base/log.h>
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#include <base/heap.h>
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#include <base/attached_rom_dataspace.h>
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#include <timer_session/connection.h>
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#include <base/session_label.h>
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namespace Rom_prefetcher {
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class Rom_session_component;
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class Rom_root;
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struct Main;
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}
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volatile int dummy;
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static void prefetch_dataspace(Genode::Region_map &rm, Genode::Dataspace_capability cap)
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{
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Genode::Attached_dataspace ds(rm, cap);
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/*
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* Modify global volatile 'dummy' variable to prevent the compiler
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* from removing the prefetch loop.
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*/
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enum { PREFETCH_STEP = 4096 };
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for (Genode::size_t i = 0; i < ds.size(); i += PREFETCH_STEP)
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dummy += ds.local_addr<char>()[i];
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}
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class Rom_prefetcher::Rom_session_component : public Genode::Rpc_object<Genode::Rom_session>
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{
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private:
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Genode::Rom_connection _rom;
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public:
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/**
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* Constructor
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*
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* \param filename name of the requested file
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*/
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Rom_session_component(Genode::Env &env, Genode::Session_label const &label)
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:
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_rom(label.string())
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{
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prefetch_dataspace(env.rm(), _rom.dataspace());
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}
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/***************************
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** ROM session interface **
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***************************/
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Genode::Rom_dataspace_capability dataspace() { return _rom.dataspace(); }
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void sigh(Genode::Signal_context_capability) { }
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};
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class Rom_prefetcher::Rom_root : public Genode::Root_component<Rom_session_component>
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{
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private:
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Genode::Env &_env;
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Rom_session_component *_create_session(const char *args)
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{
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Genode::Session_label const label = Genode::label_from_args(args);
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/* create new session for the requested file */
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return new (md_alloc())
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Rom_session_component(_env, label.last_element());
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}
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public:
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Rom_root(Genode::Env &env, Genode::Allocator &md_alloc)
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:
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Genode::Root_component<Rom_session_component>(env.ep(), md_alloc),
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_env(env)
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{ }
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};
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struct Rom_prefetcher::Main
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{
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Genode::Env &_env;
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Genode::Attached_rom_dataspace _config { _env, "config" };
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Genode::Sliced_heap _sliced_heap { _env.ram(), _env.rm() };
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Rom_root _root { _env, _sliced_heap };
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Main(Genode::Env &env) : _env(env)
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{
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Timer::Connection timer(_env);
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_config.xml().for_each_sub_node("rom", [&] (Genode::Xml_node entry) {
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typedef Genode::String<64> Name;
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Name const name = entry.attribute_value("name", Name());
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try {
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Genode::Rom_connection rom(_env, name.string());
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log("prefetching ROM module ", name);
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prefetch_dataspace(_env.rm(), rom.dataspace());
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} catch (...) {
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error("could not open ROM module ", name);
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}
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/* yield */
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timer.msleep(1);
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});
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/* announce server */
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_env.parent().announce(_env.ep().manage(_root));
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}
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};
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void Component::construct(Genode::Env &env) { static Rom_prefetcher::Main main(env); }
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