cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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spinlock.c (462B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * ARM64 Spinlock support
      4 */
      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}