1 /* 2 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. 3 * 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 34 #include <platform_def.h> 35 36 #define BAKERY_LOCK_MAX_CPUS PLATFORM_CORE_COUNT 37 38 #ifndef __ASSEMBLY__ 39 #include <stdint.h> 40 41 #if USE_COHERENT_MEM 42 43 typedef struct bakery_lock { 44 int owner; 45 volatile char entering[BAKERY_LOCK_MAX_CPUS]; 46 volatile unsigned number[BAKERY_LOCK_MAX_CPUS]; 47 } bakery_lock_t; 48 49 #define NO_OWNER (-1) 50 51 void bakery_lock_init(bakery_lock_t *bakery); 52 void bakery_lock_get(bakery_lock_t *bakery); 53 void bakery_lock_release(bakery_lock_t *bakery); 54 int bakery_lock_try(bakery_lock_t *bakery); 55 56 #else 57 58 typedef struct bakery_info { 59 /* 60 * The lock_data is a bit-field of 2 members: 61 * Bit[0] : choosing. This field is set when the CPU is 62 * choosing its bakery number. 63 * Bits[1 - 15] : number. This is the bakery number allocated. 64 */ 65 volatile uint16_t lock_data; 66 } bakery_info_t; 67 68 void bakery_lock_get(unsigned int id, unsigned int offset); 69 void bakery_lock_release(unsigned int id, unsigned int offset); 70 71 #endif /* __USE_COHERENT_MEM__ */ 72 #endif /* __ASSEMBLY__ */ 73 #endif /* __BAKERY_LOCK_H__ */ 74