mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-28 01:28:53 +00:00
17c79a9e23
Besides adapting the components to the use of base/log.h, the patch cleans up a few base headers, i.e., it removes unused includes from root/component.h, specifically base/heap.h and ram_session/ram_session.h. Hence, components that relied on the implicit inclusion of those headers have to manually include those headers now. While adjusting the log messages, I repeatedly stumbled over the problem that printing char * arguments is ambiguous. It is unclear whether to print the argument as pointer or null-terminated string. To overcome this problem, the patch introduces a new type 'Cstring' that allows the caller to express that the argument should be handled as null-terminated string. As a nice side effect, with this type in place, the optional len argument of the 'String' class could be removed. Instead of supplying a pair of (char const *, size_t), the constructor accepts a 'Cstring'. This, in turn, clears the way let the 'String' constructor use the new output mechanism to assemble a string from multiple arguments (and thereby getting rid of snprintf within Genode in the near future). To enforce the explicit resolution of the char * ambiguity, the 'char *' overload of the 'print' function is marked as deleted. Issue #1987
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 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.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__NIC__ROOT_H_
|
|
#define _INCLUDE__NIC__ROOT_H_
|
|
|
|
#include <nic/component.h>
|
|
#include <root/component.h>
|
|
|
|
namespace Nic {
|
|
|
|
template <class SESSION_COMPONENT> class Root;
|
|
};
|
|
|
|
|
|
template <class SESSION_COMPONENT>
|
|
class Nic::Root : public Genode::Root_component<SESSION_COMPONENT,
|
|
Genode::Single_client>
|
|
{
|
|
private:
|
|
|
|
Server::Entrypoint &_ep;
|
|
|
|
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::Root::Quota_exceeded();
|
|
|
|
/*
|
|
* 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::Root::Quota_exceeded();
|
|
}
|
|
|
|
return new (Root::md_alloc())
|
|
SESSION_COMPONENT(tx_buf_size, rx_buf_size,
|
|
*env()->heap(),
|
|
*env()->ram_session(),
|
|
_ep);
|
|
}
|
|
|
|
public:
|
|
|
|
Root(Server::Entrypoint &ep, Genode::Allocator &md_alloc)
|
|
: Genode::Root_component<SESSION_COMPONENT, Genode::Single_client>(&ep.rpc_ep(), &md_alloc),
|
|
_ep(ep)
|
|
{ }
|
|
};
|
|
|
|
#endif /* _INCLUDE__NIC__ROOT_H_ */
|