09d7becd070a610b4ddbd811dc4244f38ec194c3
1 /*
2 * Copyright (c) 2014, Mentor Graphics Corporation
3 * All rights reserved.
4 * Copyright (c) 2016 NXP Semiconductor, Inc. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * 3. Neither the name of Mentor Graphics Corporation nor the names of its
15 * contributors may be used to endorse or promote products derived from this
16 * software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
31 /**************************************************************************
32 * FILE NAME
33 *
34 * sh_mem.c
35 *
36 * COMPONENT
37 *
38 * IPC Stack for uAMP systems.
39 *
40 * DESCRIPTION
41 *
42 * Header file for fixed buffer size memory management service. Currently
43 * it is being used to manage shared memory.
44 *
45 **************************************************************************/
46 #ifndef SH_MEM_H_
47 #define SH_MEM_H_
49 #include "openamp/env.h"
51 /* Macros */
52 #define BITMAP_WORD_SIZE 32
53 #define WORD_SIZE sizeof(unsigned long)
54 #define WORD_ALIGN(a) (((a) & (WORD_SIZE-1)) != 0)? \
55 (((a) & (~(WORD_SIZE-1))) + 4):(a)
56 #define SH_MEM_POOL_LOCATE_BITMAP(pool,idx) ((unsigned char *) pool \
57 + sizeof(struct sh_mem_pool) \
58 + (BITMAP_WORD_SIZE * idx))
60 /*
61 * This structure represents a shared memory pool.
62 *
63 * @start_addr - start address of shared memory region
64 * @lock - lock to ensure exclusive access
65 * @size - size of shared memory*
66 * @buff_size - size of each buffer
67 * @total_buffs - total number of buffers in shared memory region
68 * @used_buffs - number of used buffers
69 * @bmp_size - size of bitmap array
70 *
71 */
73 struct sh_mem_pool {
74 void *start_addr;
75 LOCK *lock;
76 int size;
77 int buff_size;
78 int total_buffs;
79 int used_buffs;
80 int bmp_size;
81 };
83 /* APIs */
84 struct sh_mem_pool *sh_mem_create_pool(void *start_addr, unsigned int size,
85 unsigned int buff_size);
86 void sh_mem_delete_pool(struct sh_mem_pool *pool);
87 void *sh_mem_get_buffer(struct sh_mem_pool *pool);
88 void sh_mem_free_buffer(void *ptr, struct sh_mem_pool *pool);
89 unsigned int get_first_zero_bit(unsigned long value);
91 #endif /* SH_MEM_H_ */