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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barrier.h (776B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_UM_BARRIER_H_
      3#define _ASM_UM_BARRIER_H_
      4
      5#include <asm/cpufeatures.h>
      6#include <asm/alternative.h>
      7
      8/*
      9 * Force strict CPU ordering.
     10 * And yes, this is required on UP too when we're talking
     11 * to devices.
     12 */
     13#ifdef CONFIG_X86_32
     14
     15#define mb()	alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
     16#define rmb()	alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
     17#define wmb()	alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
     18
     19#else /* CONFIG_X86_32 */
     20
     21#define mb()	asm volatile("mfence" : : : "memory")
     22#define rmb()	asm volatile("lfence" : : : "memory")
     23#define wmb()	asm volatile("sfence" : : : "memory")
     24
     25#endif /* CONFIG_X86_32 */
     26
     27#include <asm-generic/barrier.h>
     28
     29#endif