32 lines
402 B
ArmAsm
32 lines
402 B
ArmAsm
/*
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* Copyright (c) 2016, 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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#include <asm_macros.S>
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.globl spin_lock
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.globl spin_unlock
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func spin_lock
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mov r2, #1
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1:
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ldrex r1, [r0]
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cmp r1, #0
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wfene
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strexeq r1, r2, [r0]
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cmpeq r1, #0
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bne 1b
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dmb
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bx lr
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endfunc spin_lock
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func spin_unlock
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mov r1, #0
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stl r1, [r0]
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bx lr
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endfunc spin_unlock
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