69 lines
1.4 KiB
C++
69 lines
1.4 KiB
C++
/*
|
|
* \brief OKL4-specific layout of IPC message buffer
|
|
* \author Norman Feske
|
|
* \date 2009-03-25
|
|
*
|
|
* On OKL4, we do not directly use the a kernel-specific message-buffer layout.
|
|
* The IPC goes through the UTCBs of the sending and receiving threads. Because
|
|
* on Genode, message buffers are decoupled from threads, we need to copy-in
|
|
* and copy-out the message payload between the message buffers and the used
|
|
* UTCBs.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2009-2013 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__BASE__IPC_MSGBUF_H_
|
|
#define _INCLUDE__BASE__IPC_MSGBUF_H_
|
|
|
|
namespace Genode {
|
|
|
|
/**
|
|
* IPC message buffer layout
|
|
*/
|
|
class Msgbuf_base
|
|
{
|
|
protected:
|
|
|
|
size_t _size;
|
|
char _msg_start[]; /* symbol marks start of message */
|
|
|
|
public:
|
|
|
|
/*
|
|
* Begin of actual message buffer
|
|
*/
|
|
char buf[];
|
|
|
|
/**
|
|
* Return size of message buffer
|
|
*/
|
|
inline size_t size() const { return _size; };
|
|
|
|
/**
|
|
* Return address of message buffer
|
|
*/
|
|
inline void *addr() { return &_msg_start[0]; };
|
|
};
|
|
|
|
|
|
/**
|
|
* Instance of IPC message buffer with specified buffer size
|
|
*/
|
|
template <unsigned BUF_SIZE>
|
|
class Msgbuf : public Msgbuf_base
|
|
{
|
|
public:
|
|
|
|
char buf[BUF_SIZE];
|
|
|
|
Msgbuf() { _size = BUF_SIZE; }
|
|
};
|
|
}
|
|
|
|
#endif /* _INCLUDE__BASE__IPC_MSGBUF_H_ */
|