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