78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
/**
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* \brief Simple single client NIC Root
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* \author Sebastian Sumpf
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* \date 2015-06-23
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*/
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/*
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* Copyright (C) 2015 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 _INCLUDE__NIC__ROOT_H_
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#define _INCLUDE__NIC__ROOT_H_
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#include <nic/component.h>
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#include <root/component.h>
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namespace Nic {
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template <class SESSION_COMPONENT> class Root;
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};
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template <class SESSION_COMPONENT>
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class Nic::Root : public Genode::Root_component<SESSION_COMPONENT,
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Genode::Single_client>
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{
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private:
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Server::Entrypoint &_ep;
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protected:
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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 = Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
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size_t tx_buf_size = Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
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size_t rx_buf_size = Arg_string::find_arg(args, "rx_buf_size").ulong_value(0);
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/* deplete ram quota by the memory needed for the session structure */
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size_t session_size = max(4096UL, (unsigned long)sizeof(SESSION_COMPONENT));
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if (ram_quota < session_size)
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throw Genode::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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|| rx_buf_size > ram_quota - session_size
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|| tx_buf_size + rx_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 + rx_buf_size + session_size);
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throw Genode::Root::Quota_exceeded();
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}
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return new (Root::md_alloc())
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SESSION_COMPONENT(tx_buf_size, rx_buf_size,
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*env()->heap(),
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*env()->ram_session(),
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_ep);
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}
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public:
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Root(Server::Entrypoint &ep, Genode::Allocator &md_alloc)
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: Genode::Root_component<SESSION_COMPONENT, Genode::Single_client>(&ep.rpc_ep(), &md_alloc),
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_ep(ep)
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{ }
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};
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#endif /* _INCLUDE__NIC__ROOT_H_ */
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