106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
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/*
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* Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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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 __ASSEMBLER__
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#include <cdefs.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <lib/utils_def.h>
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/*****************************************************************************
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* Internal helpers used by the bakery lock implementation.
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****************************************************************************/
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/* Convert a ticket to priority */
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static inline unsigned int bakery_get_priority(unsigned int t, unsigned int pos)
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{
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return (t << 8) | pos;
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}
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#define CHOOSING_TICKET U(0x1)
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#define CHOSEN_TICKET U(0x0)
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static inline bool bakery_is_choosing(unsigned int info)
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{
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return (info & 1U) == CHOOSING_TICKET;
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}
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static inline unsigned int bakery_ticket_number(unsigned int info)
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{
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return (info >> 1) & 0x7FFFU;
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}
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static inline uint16_t make_bakery_data(unsigned int choosing, unsigned int num)
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{
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unsigned int val = (choosing & 0x1U) | (num << 1);
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return (uint16_t) val;
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}
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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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static 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 /* __ASSEMBLER__ */
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#endif /* BAKERY_LOCK_H */
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