// SPDX-License-Identifier: GPL-2.0
/*
 * ARM64 Spinlock support
 */
#include <stdint.h>

#include "spinlock.h"

void spin_lock(struct spinlock *lock)
{
        int val, res;

        asm volatile(
        "1:     ldaxr   %w0, [%2]\n"
        "       cbnz    %w0, 1b\n"
        "       mov     %w0, #1\n"
        "       stxr    %w1, %w0, [%2]\n"
        "       cbnz    %w1, 1b\n"
        : "=&r" (val), "=&r" (res)
        : "r" (&lock->v)
        : "memory");
}

void spin_unlock(struct spinlock *lock)
{
        asm volatile("stlr wzr, [%0]\n" : : "r" (&lock->v) : "memory");
}