mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-25 16:31:06 +00:00
83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
/*
|
|
* \brief ROM session interface
|
|
* \author Norman Feske
|
|
* \date 2006-07-06
|
|
*
|
|
* A ROM session corresponds to an open file. The file name is specified as an
|
|
* argument on session creation.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2013 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__ROM_SESSION__ROM_SESSION_H_
|
|
#define _INCLUDE__ROM_SESSION__ROM_SESSION_H_
|
|
|
|
#include <dataspace/capability.h>
|
|
#include <session/session.h>
|
|
#include <base/signal.h>
|
|
|
|
namespace Genode {
|
|
|
|
struct Rom_dataspace : Dataspace { };
|
|
|
|
typedef Capability<Rom_dataspace> Rom_dataspace_capability;
|
|
|
|
struct Rom_session : Session
|
|
{
|
|
static const char *service_name() { return "ROM"; }
|
|
|
|
virtual ~Rom_session() { }
|
|
|
|
/**
|
|
* Request dataspace containing the ROM session data
|
|
*
|
|
* \return capability to ROM dataspace
|
|
*
|
|
* The capability may be invalid.
|
|
*
|
|
* Consecutive calls of this functions are not guaranteed to return the
|
|
* same dataspace as dynamic ROM sessions may update the ROM data
|
|
* during the lifetime of the session. When calling the function, the
|
|
* server may destroy the old dataspace and replace it with a new one
|
|
* containing the updated data. Hence, prior calling this function, the
|
|
* client should make sure to detach the previously requested dataspace
|
|
* from its local address space.
|
|
*/
|
|
virtual Rom_dataspace_capability dataspace() = 0;
|
|
|
|
/**
|
|
* Register signal handler to be notified of ROM data changes
|
|
*
|
|
* The ROM session interface allows for the implementation of ROM
|
|
* services that dynamically update the data exported as ROM dataspace
|
|
* during the lifetime of the session. This is useful in scenarios
|
|
* where this data is generated rather than originating from a static
|
|
* file, for example to update a program's configuration at runtime.
|
|
*
|
|
* By installing a signal handler using the 'sigh()' function, the
|
|
* client will receive a notification each time the data changes at the
|
|
* server. From the client's perspective, the original data contained
|
|
* in the currently used dataspace remains unchanged until the client
|
|
* calls 'dataspace()' the next time.
|
|
*/
|
|
virtual void sigh(Signal_context_capability sigh) = 0;
|
|
|
|
|
|
/*********************
|
|
** RPC declaration **
|
|
*********************/
|
|
|
|
GENODE_RPC(Rpc_dataspace, Rom_dataspace_capability, dataspace);
|
|
GENODE_RPC(Rpc_sigh, void, sigh, Signal_context_capability);
|
|
|
|
GENODE_RPC_INTERFACE(Rpc_dataspace, Rpc_sigh);
|
|
};
|
|
}
|
|
|
|
#endif /* _INCLUDE__ROM_SESSION__ROM_SESSION_H_ */
|