99 lines
2.1 KiB
C++
99 lines
2.1 KiB
C++
/**
|
|
* \brief Input driver front-end
|
|
* \author Norman Feske
|
|
* \author Christian Helmuth
|
|
* \date 2006-08-30
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2016 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
/* Genode */
|
|
#include <base/env.h>
|
|
#include <base/signal.h>
|
|
#include <base/heap.h>
|
|
#include <base/component.h>
|
|
#include <base/rpc_server.h>
|
|
#include <root/component.h>
|
|
#include <input_session/input_session.h>
|
|
#include <input/event.h>
|
|
#include <base/log.h>
|
|
|
|
using namespace Genode;
|
|
|
|
|
|
/*****************************************
|
|
** Implementation of the input service **
|
|
*****************************************/
|
|
|
|
/*
|
|
* Input event buffer that is shared with the client
|
|
*/
|
|
enum { MAX_EVENTS = 1000 };
|
|
static Dataspace_capability ev_ds_cap;
|
|
|
|
namespace Input {
|
|
|
|
class Session_component : public Genode::Rpc_object<Session>
|
|
{
|
|
public:
|
|
|
|
Dataspace_capability dataspace() override { return ev_ds_cap; }
|
|
|
|
bool pending() const override { return 0; }
|
|
|
|
int flush() override
|
|
{
|
|
/* return number of flushed events */
|
|
return 0;
|
|
}
|
|
|
|
void sigh(Genode::Signal_context_capability) override { }
|
|
};
|
|
|
|
|
|
class Root : public Root_component<Session_component>
|
|
{
|
|
protected:
|
|
|
|
Session_component *_create_session(const char *args) {
|
|
return new (md_alloc()) Session_component(); }
|
|
|
|
public:
|
|
|
|
Root(Genode::Entrypoint &ep, Allocator &md_alloc)
|
|
: Root_component<Session_component>(ep, md_alloc) { }
|
|
};
|
|
}
|
|
|
|
|
|
struct Main
|
|
{
|
|
Genode::Sliced_heap heap;
|
|
|
|
Input::Root root;
|
|
|
|
Main(Genode::Env &env)
|
|
:
|
|
heap(env.ram(), env.rm()),
|
|
root(env.ep(), heap)
|
|
{
|
|
/* create dataspace for event buffer that is shared with the client */
|
|
try { ev_ds_cap = env.ram().alloc(MAX_EVENTS*sizeof(Input::Event)); }
|
|
catch (Ram_session::Alloc_failed) {
|
|
Genode::error("could not allocate dataspace for event buffer");
|
|
throw Genode::Exception();
|
|
}
|
|
|
|
/* tell parent about the service */
|
|
env.parent().announce(env.ep().manage(root));
|
|
}
|
|
};
|
|
|
|
|
|
void Component::construct(Genode::Env &env) { static Main server(env); }
|