256 lines
6.3 KiB
C++
256 lines
6.3 KiB
C++
/*
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* \brief Test for the block session server side
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* \author Stefan Kalkowski
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* \date 2010-07-06
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*
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* This test app provides the framebuffer it requests via framebuffer session
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* as a block device.
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*/
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/*
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* Copyright (C) 2010-2013 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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#include <base/printf.h>
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#include <base/allocator_avl.h>
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#include <cap_session/connection.h>
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#include <root/component.h>
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#include <util/arg_string.h>
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#include <util/misc_math.h>
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#include <block_session/rpc_object.h>
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#include <framebuffer_session/connection.h>
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#include <timer_session/connection.h>
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#include <base/semaphore.h>
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static Genode::size_t fb_size = 0; /* framebuffer size */
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static Genode::addr_t fb_addr = 0; /* start address of framebuffer */
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namespace Block {
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class Session_component : public Session_rpc_object
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{
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private:
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enum { BLOCK_SIZE = 512 };
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/**
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* Thread handling the requests of an open block session.
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*/
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class Tx_thread : public Genode::Thread<8192>
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{
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private:
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Session_component *_session;
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public:
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/**
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* Constructor
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*/
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Tx_thread(Session_component *session)
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: Thread("block_session_tx"), _session(session) { }
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/**
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* Thread entry function.
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*/
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void entry()
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{
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using namespace Genode;
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Session_component::Tx::Sink *tx_sink = _session->tx_sink();
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Block::Packet_descriptor packet;
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/* signal to server activation: we're ready */
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_session->tx_ready();
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/* handle requests */
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while (true) {
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/* blocking-get packet from client */
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packet = tx_sink->get_packet();
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if (!packet.valid()) {
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PWRN("received invalid packet");
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continue;
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}
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/* sanity check block number */
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if ((packet.block_number() + packet.block_count()
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> fb_size / BLOCK_SIZE)
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|| packet.block_number() < 0) {
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PWRN("requested %zd blocks from block %zd",
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packet.block_count(), packet.block_number());
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PWRN("out of range!");
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continue;
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}
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Genode::size_t offset = packet.block_number() * BLOCK_SIZE;
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Genode::size_t size = packet.block_count() * BLOCK_SIZE;
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switch (packet.operation()) {
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case Block::Packet_descriptor::READ:
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{
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/* copy content to packet payload */
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memcpy(tx_sink->packet_content(packet),
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(void*)(fb_addr + offset),
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size);
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break;
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}
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case Block::Packet_descriptor::WRITE:
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{
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/* copy content from packet payload */
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memcpy((void*)(fb_addr + offset),
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tx_sink->packet_content(packet),
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size);
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break;
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}
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default:
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PWRN("Unsupported operation %d", packet.operation());
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continue;
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}
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/* mark success of operation */
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packet.succeeded(true);
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/* acknowledge packet to the client */
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if (!tx_sink->ready_to_ack())
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PDBG("need to wait until ready-for-ack");
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tx_sink->acknowledge_packet(packet);
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}
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}
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};
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private:
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Genode::Dataspace_capability _tx_ds; /* buffer for tx channel */
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Genode::Semaphore _startup_sema; /* thread startup sync */
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Tx_thread _tx_thread;
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public:
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/**
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* Constructor
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*
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* \param tx_buf_size buffer size for tx channel
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*/
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Session_component(Genode::size_t tx_buf_size,
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Genode::Rpc_entrypoint &ep)
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: Session_rpc_object(Genode::env()->ram_session()->alloc(tx_buf_size), ep),
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_startup_sema(0), _tx_thread(this)
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{
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_tx_thread.start();
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_startup_sema.down();
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}
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void info(Genode::size_t *blk_count, Genode::size_t *blk_size,
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Operations *ops)
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{
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*blk_count = fb_size / BLOCK_SIZE;
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*blk_size = BLOCK_SIZE;
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ops->set_operation(Packet_descriptor::READ);
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ops->set_operation(Packet_descriptor::WRITE);
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}
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void sync() {}
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/** Signal that transmit thread is ready */
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void tx_ready() { _startup_sema.up(); }
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};
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/*
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* Block-session component is a singleton,
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* only one client should use the driver directly.
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*/
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static Session_component *_session = 0;
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/**
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* Shortcut for single-client root component
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*/
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typedef Genode::Root_component<Session_component, Genode::Single_client>
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Root_component;
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/**
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* Root component, handling new session requests
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*/
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class Root : public Root_component
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{
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private:
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Genode::Rpc_entrypoint &_ep;
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protected:
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/**
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* Always returns the singleton block-session component
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*/
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Session_component *_create_session(const char *args)
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{
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using namespace Genode;
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if (Block::_session) {
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PERR("Support for single session only! Aborting...");
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throw Root::Unavailable();
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}
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Genode::size_t ram_quota =
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Arg_string::find_arg(args, "ram_quota").ulong_value(0);
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Genode::size_t tx_buf_size =
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Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
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/* delete ram quota by the memory needed for the session */
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Genode::size_t session_size = max((Genode::size_t)4096,
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sizeof(Session_component));
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if (ram_quota < session_size)
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throw Root::Quota_exceeded();
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/*
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* Check if donated ram quota suffices for the
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* communication buffer.
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*/
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if (tx_buf_size > ram_quota - session_size) {
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PERR("insufficient 'ram_quota', got %zd, need %zd",
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ram_quota, tx_buf_size + session_size);
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throw Root::Quota_exceeded();
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}
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Block::_session = new (md_alloc()) Session_component(tx_buf_size, _ep);
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return Block::_session;
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}
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public:
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Root(Genode::Rpc_entrypoint *session_ep,
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Genode::Allocator *md_alloc)
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: Root_component(session_ep, md_alloc), _ep(*session_ep) { }
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};
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}
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int main()
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{
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using namespace Genode;
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Framebuffer::Connection fb;
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Dataspace_capability fb_cap = fb.dataspace();
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Dataspace_client dsc(fb_cap);
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fb_addr = env()->rm_session()->attach(fb_cap);
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fb_size = dsc.size();
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enum { STACK_SIZE = 4096 };
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static Cap_connection cap;
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static Rpc_entrypoint ep(&cap, STACK_SIZE, "fb_block_ep");
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static Block::Root block_root(&ep, env()->heap());
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env()->parent()->announce(ep.manage(&block_root));
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Timer::Connection timer;
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while (true) {
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fb.refresh(0,0,1024,768);
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timer.msleep(50);
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}
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return 0;
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}
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