141 lines
4.0 KiB
C++
141 lines
4.0 KiB
C++
/**
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* \brief Packet-stream-session components
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* \author Sebastian Sumpf
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* \author Norman Feske
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* \date 2012-07-06
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*/
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/*
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* Copyright (C) 2012-2013 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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#ifndef _SIGNAL__DISPATCHER_H_
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#define _SIGNAL__DISPATCHER_H_
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#include "signal.h"
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/**
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* Session components that overrides signal handlers
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*/
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template <typename RPC>
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class Packet_session_component : public RPC
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{
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private:
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Genode::Signal_dispatcher<Packet_session_component> _process_packet_dispatcher;
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protected:
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virtual void _process_packets(unsigned) = 0;
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public:
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Packet_session_component(Genode::Dataspace_capability tx_ds,
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Genode::Rpc_entrypoint &ep,
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Genode::Signal_receiver *sig_rec)
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:
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RPC(tx_ds, ep),
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_process_packet_dispatcher(*sig_rec, *this,
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&Packet_session_component::_process_packets)
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{
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/*
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* Register '_process_packets' dispatch function as signal
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* handler for packet-avail and ready-to-ack signals.
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*/
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RPC::_tx.sigh_packet_avail(_process_packet_dispatcher);
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RPC::_tx.sigh_ready_to_ack(_process_packet_dispatcher);
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}
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Packet_session_component(Genode::Dataspace_capability tx_ds,
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Genode::Dataspace_capability rx_ds,
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Genode::Range_allocator *rx_buffer_alloc,
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Genode::Rpc_entrypoint &ep,
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Genode::Signal_receiver *sig_rec)
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:
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RPC(tx_ds, rx_ds, rx_buffer_alloc, ep),
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_process_packet_dispatcher(*sig_rec, *this,
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&Packet_session_component::_process_packets)
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{
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/*
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* Register '_process_packets' dispatch function as signal
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* handler for packet-avail and ready-to-ack signals.
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*/
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RPC::_tx.sigh_packet_avail(_process_packet_dispatcher);
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RPC::_tx.sigh_ready_to_ack(_process_packet_dispatcher);
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}
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};
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/**
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* Abstract device
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*/
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struct Device { };
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/**
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* Root component, handling new session requests
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*/
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template <typename ROOT_COMPONENT, typename SESSION_COMPONENT, bool CACHED>
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class Packet_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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Genode::Signal_receiver *_sig_rec;
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Device *_device;
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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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size_t ram_quota =
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Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
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size_t tx_buf_size =
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Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
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size_t rx_buf_size =
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Arg_string::find_arg(args, "rx_buf_size").ulong_value(0);
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/* delete ram quota by the memory needed for the session */
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size_t session_size = max((size_t)4096,
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sizeof(SESSION_COMPONENT)
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+ sizeof(Allocator_avl));
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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 both communication
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* buffers. Also check both sizes separately to handle a
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* possible overflow of the sum of both sizes.
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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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return new (ROOT_COMPONENT::md_alloc())
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SESSION_COMPONENT(env()->ram_session()->alloc(tx_buf_size, CACHED),
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env()->ram_session()->alloc(rx_buf_size, CACHED),
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_ep, _sig_rec, _device);
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}
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public:
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Packet_root(Genode::Rpc_entrypoint *session_ep, Genode::Allocator *md_alloc,
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Genode::Signal_receiver *sig_rec, Device *device)
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:
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ROOT_COMPONENT(session_ep, md_alloc),
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_ep(*session_ep), _sig_rec(sig_rec), _device(device)
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{ }
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};
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#endif /* _SIGNAL__DISPATCHER_H_ */
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