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