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Achin Gupta4f6ad662013-10-25 09:08:21 +01001/*
Dan Handleye83b0ca2014-01-14 18:17:09 +00002 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
Achin Gupta4f6ad662013-10-25 09:08:21 +01003 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * Neither the name of ARM nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific
16 * 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 */
30
31#ifndef __BAKERY_LOCK_H__
32#define __BAKERY_LOCK_H__
33
Dan Handleyed6ff952014-05-14 17:44:19 +010034#include <platform_def.h>
Achin Gupta4f6ad662013-10-25 09:08:21 +010035
36#define BAKERY_LOCK_MAX_CPUS PLATFORM_CORE_COUNT
37
Dan Handleye2712bc2014-04-10 15:37:22 +010038typedef struct bakery_lock {
Jeenu Viswambharanbe87cfc2014-03-13 11:16:25 +000039 int owner;
Achin Gupta4f6ad662013-10-25 09:08:21 +010040 volatile char entering[BAKERY_LOCK_MAX_CPUS];
41 volatile unsigned number[BAKERY_LOCK_MAX_CPUS];
Dan Handleye2712bc2014-04-10 15:37:22 +010042} bakery_lock_t;
Achin Gupta4f6ad662013-10-25 09:08:21 +010043
44#define NO_OWNER (-1)
45
Dan Handleye2712bc2014-04-10 15:37:22 +010046void bakery_lock_init(bakery_lock_t *bakery);
Andrew Thoelke958cc022014-06-09 12:54:15 +010047void bakery_lock_get(bakery_lock_t *bakery);
48void bakery_lock_release(bakery_lock_t *bakery);
49int bakery_lock_try(bakery_lock_t *bakery);
Achin Gupta4f6ad662013-10-25 09:08:21 +010050
51#endif /* __BAKERY_LOCK_H__ */