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44 lines
849 B
44 lines
849 B
/*
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* (C) Copyright 2025 Rockchip Electronics Co., Ltd.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm/macro.h>
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#include <asm-offsets.h>
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#include <config.h>
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#include <linux/linkage.h>
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.globl __spin_lock
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.globl __spin_unlock
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/*
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* Acquire lock using load-/store-exclusive instruction pair.
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*
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* void __spin_lock(spinlock_t *lock);
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*/
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ENTRY(__spin_lock)
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mov w2, #1
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sevl
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l1: wfe
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l2: ldaxr w1, [x0]
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cbnz w1, l1
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stxr w1, w2, [x0]
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cbnz w1, l2
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ret
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ENDPROC(__spin_lock)
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/*
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* Release lock previously acquired by __spin_lock.
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*
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* Use store-release to unconditionally clear the spinlock variable.
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* Store operation generates an event to all cores waiting in WFE
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* when address is monitored by the global monitor.
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*
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* void __spin_unlock(spinlock_t *lock);
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*/
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ENTRY(__spin_unlock)
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stlr wzr, [x0]
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ret
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ENDPROC(__spin_unlock)
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