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EMACMemoryManager.h
1 /* Copyright (c) 2017 ARM Limited
2  *
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef EMAC_MEMORY_MANAGER_H
17 #define EMAC_MEMORY_MANAGER_H
18 
19 /**
20  * Emac interface memory manager
21  *
22  * This interface provides abstraction for memory modules used in different IP stacks (often to accommodate zero
23  * copy). Emac interface is required to accept output packets and provide received data using this stack-
24  * independent API. This header should be implemented for each IP stack, so that we keep emacs module independent.
25  *
26  * Emac memory interface uses memory buffer chains to store data. Data passed in either direction
27  * may be either contiguous (a single-buffer chain), or may consist of multiple buffers.
28  * Chaining of the buffers is made using singly-linked list. The Emac data-passing APIs do not specify
29  * alignment or structure of the chain in either direction.
30  *
31  * Memory buffers can be allocated either from heap or from memory pools. Heap buffers are always contiguous.
32  * Memory pool buffers may be either contiguous or chained depending on allocation size.
33  *
34  * On Emac interface buffer chain ownership is transferred. Emac must free buffer chain that it is given for
35  * link output and the stack must free the buffer chain that it is given for link input.
36  *
37  */
38 
39 #include "nsapi.h"
40 #include "NetStackMemoryManager.h"
41 
42 typedef void emac_mem_buf_t; // Memory buffer
43 
44 class EMACMemoryManager : public NetStackMemoryManager {
45 
46 };
47 
48 #endif /* EMAC_MEMORY_MANAGER_H */
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