mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-26 00:41:08 +00:00
6609aafb05
This patch replaces the 'Parent::Quota_exceeded', 'Service::Quota_exceeded', and 'Root::Quota_exceeded' exceptions by the single 'Insufficient_ram_quota' exception type. Furthermore, the 'Parent' interface distinguished now between 'Out_of_ram' (the child's RAM is exhausted) from 'Insufficient_ram_quota' (the child's RAM donation does not suffice to establish the session). This eliminates ambiguities and removes the need to convert exception types along the path of the session creation. Issue #2398
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/**
|
|
* \brief Simple single client NIC Root
|
|
* \author Sebastian Sumpf
|
|
* \date 2015-06-23
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2015-2017 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.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__NIC__ROOT_H_
|
|
#define _INCLUDE__NIC__ROOT_H_
|
|
|
|
#include <nic/component.h>
|
|
#include <root/component.h>
|
|
|
|
namespace Nic {
|
|
using namespace Genode;
|
|
|
|
template <class SESSION_COMPONENT> class Root;
|
|
};
|
|
|
|
|
|
template <class SESSION_COMPONENT>
|
|
class Nic::Root : public Genode::Root_component<SESSION_COMPONENT,
|
|
Genode::Single_client>
|
|
{
|
|
private:
|
|
|
|
Env &_env;
|
|
Allocator &_md_alloc;
|
|
|
|
protected:
|
|
|
|
SESSION_COMPONENT *_create_session(const char *args)
|
|
{
|
|
using namespace Genode;
|
|
|
|
size_t ram_quota = Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
|
|
size_t tx_buf_size = Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
|
|
size_t rx_buf_size = Arg_string::find_arg(args, "rx_buf_size").ulong_value(0);
|
|
|
|
/* deplete ram quota by the memory needed for the session structure */
|
|
size_t session_size = max(4096UL, (unsigned long)sizeof(SESSION_COMPONENT));
|
|
if (ram_quota < session_size)
|
|
throw Genode::Insufficient_ram_quota();
|
|
|
|
/*
|
|
* Check if donated ram quota suffices for both communication
|
|
* buffers and check for overflow
|
|
*/
|
|
if (tx_buf_size + rx_buf_size < tx_buf_size ||
|
|
tx_buf_size + rx_buf_size > ram_quota - session_size) {
|
|
Genode::error("insufficient 'ram_quota', got ", ram_quota, ", "
|
|
"need ", tx_buf_size + rx_buf_size + session_size);
|
|
throw Genode::Insufficient_ram_quota();
|
|
}
|
|
|
|
return new (Root::md_alloc())
|
|
SESSION_COMPONENT(tx_buf_size, rx_buf_size,
|
|
_md_alloc, _env);
|
|
}
|
|
|
|
public:
|
|
|
|
Root(Genode::Env &env, Genode::Allocator &md_alloc)
|
|
: Genode::Root_component<SESSION_COMPONENT, Genode::Single_client>(&env.ep().rpc_ep(), &md_alloc),
|
|
_env(env), _md_alloc(md_alloc)
|
|
{ }
|
|
};
|
|
|
|
#endif /* _INCLUDE__NIC__ROOT_H_ */
|