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Remove ROM prefetcher

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Fixes #4418
This commit is contained in:
Norman Feske
2022-02-11 09:14:23 +01:00
parent 392a2cba66
commit 4f40a607ea
2 changed files with 0 additions and 145 deletions
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142
repos/os/src/server/rom_prefetcher/main.cc
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/*
* \brief ROM prefetching service
* \author Norman Feske
* \date 2011-01-24
*/
/*
* Copyright (C) 2011-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
/* Genode includes */
#include <root/component.h>
#include <base/component.h>
#include <base/log.h>
#include <base/heap.h>
#include <base/attached_rom_dataspace.h>
#include <timer_session/connection.h>
#include <base/session_label.h>
namespace Rom_prefetcher {
class Rom_session_component;
class Rom_root;
struct Main;
}
volatile int dummy;
static void prefetch_dataspace(Genode::Region_map &rm, Genode::Dataspace_capability cap)
{
Genode::Attached_dataspace ds(rm, cap);
/*
* Modify global volatile 'dummy' variable to prevent the compiler
* from removing the prefetch loop.
*/
enum { PREFETCH_STEP = 4096 };
for (Genode::size_t i = 0; i < ds.size(); i += PREFETCH_STEP)
dummy += ds.local_addr<char>()[i];
}
class Rom_prefetcher::Rom_session_component : public Genode::Rpc_object<Genode::Rom_session>
{
private:
Genode::Rom_connection _rom;
public:
/**
* Constructor
*
* \param filename name of the requested file
*/
Rom_session_component(Genode::Env &env, Genode::Session_label const &label)
:
_rom(env, label.string())
{
prefetch_dataspace(env.rm(), _rom.dataspace());
}
/***************************
** ROM session interface **
***************************/
Genode::Rom_dataspace_capability dataspace() override { return _rom.dataspace(); }
void sigh(Genode::Signal_context_capability) override { }
};
class Rom_prefetcher::Rom_root : public Genode::Root_component<Rom_session_component>
{
private:
Genode::Env &_env;
Rom_session_component *_create_session(const char *args) override
{
Genode::Session_label const label = Genode::label_from_args(args);
/* create new session for the requested file */
return new (md_alloc())
Rom_session_component(_env, label.last_element());
}
public:
Rom_root(Genode::Env &env, Genode::Allocator &md_alloc)
:
Genode::Root_component<Rom_session_component>(env.ep(), md_alloc),
_env(env)
{ }
};
struct Rom_prefetcher::Main
{
Genode::Env &_env;
Genode::Attached_rom_dataspace _config { _env, "config" };
Genode::Sliced_heap _sliced_heap { _env.ram(), _env.rm() };
Rom_root _root { _env, _sliced_heap };
Main(Genode::Env &env) : _env(env)
{
Timer::Connection timer(_env);
_config.xml().for_each_sub_node("rom", [&] (Genode::Xml_node entry) {
typedef Genode::String<64> Name;
Name const name = entry.attribute_value("name", Name());
try {
Genode::Rom_connection rom(_env, name.string());
log("prefetching ROM module ", name);
prefetch_dataspace(_env.rm(), rom.dataspace());
} catch (...) {
error("could not open ROM module ", name);
}
/* yield */
timer.msleep(1);
});
/* announce server */
_env.parent().announce(_env.ep().manage(_root));
}
};
void Component::construct(Genode::Env &env) { static Rom_prefetcher::Main main(env); }

3
repos/os/src/server/rom_prefetcher/target.mk
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TARGET = rom_prefetcher
SRC_CC = main.cc
LIBS += base