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1// SPDX-License-Identifier: GPL-2.02/*3 * ARM64 Spinlock support4 */5#include <stdint.h>6 7#include "spinlock.h"8 9void spin_lock(struct spinlock *lock)10{11 int val, res;12 13 asm volatile(14 "1: ldaxr %w0, [%2]\n"15 " cbnz %w0, 1b\n"16 " mov %w0, #1\n"17 " stxr %w1, %w0, [%2]\n"18 " cbnz %w1, 1b\n"19 : "=&r" (val), "=&r" (res)20 : "r" (&lock->v)21 : "memory");22}23 24void spin_unlock(struct spinlock *lock)25{26 asm volatile("stlr wzr, [%0]\n" : : "r" (&lock->v) : "memory");27}28