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/*
* Copyright (c) 2013-2015, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __BAKERY_LOCK_H__
#define __BAKERY_LOCK_H__
#include <platform_def.h>
#define BAKERY_LOCK_MAX_CPUS PLATFORM_CORE_COUNT
#ifndef __ASSEMBLY__
#include <stdint.h>
/*****************************************************************************
* Internal helper macros used by the bakery lock implementation.
****************************************************************************/
/* Convert a ticket to priority */
#define PRIORITY(t, pos) (((t) << 8) | (pos))
#define CHOOSING_TICKET 0x1
#define CHOSEN_TICKET 0x0
#define bakery_is_choosing(info) (info & 0x1)
#define bakery_ticket_number(info) ((info >> 1) & 0x7FFF)
#define make_bakery_data(choosing, number) \
(((choosing & 0x1) | (number << 1)) & 0xFFFF)
/*****************************************************************************
* External bakery lock interface.
****************************************************************************/
#if USE_COHERENT_MEM
typedef struct bakery_lock {
/*
* The lock_data is a bit-field of 2 members:
* Bit[0] : choosing. This field is set when the CPU is
* choosing its bakery number.
* Bits[1 - 15] : number. This is the bakery number allocated.
*/
volatile uint16_t lock_data[BAKERY_LOCK_MAX_CPUS];
} bakery_lock_t;
void bakery_lock_init(bakery_lock_t *bakery);
void bakery_lock_get(bakery_lock_t *bakery);
void bakery_lock_release(bakery_lock_t *bakery);
int bakery_lock_try(bakery_lock_t *bakery);
#else
typedef struct bakery_info {
/*
* The lock_data is a bit-field of 2 members:
* Bit[0] : choosing. This field is set when the CPU is
* choosing its bakery number.
* Bits[1 - 15] : number. This is the bakery number allocated.
*/
volatile uint16_t lock_data;
} bakery_info_t;
void bakery_lock_get(unsigned int id, unsigned int offset);
void bakery_lock_release(unsigned int id, unsigned int offset);
#endif /* __USE_COHERENT_MEM__ */
#endif /* __ASSEMBLY__ */
#endif /* __BAKERY_LOCK_H__ */