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

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_UM_BARRIER_H_
 3#define _ASM_UM_BARRIER_H_
 4
 5#include <asm/asm.h>
 6#include <asm/segment.h>
 7#include <asm/cpufeatures.h>
 8#include <asm/cmpxchg.h>
 9#include <asm/nops.h>
10
11#include <linux/kernel.h>
12#include <linux/irqflags.h>
13
14/*
15 * Force strict CPU ordering.
16 * And yes, this is required on UP too when we're talking
17 * to devices.
18 */
19#ifdef CONFIG_X86_32
20
21#define mb()	alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
22#define rmb()	alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
23#define wmb()	alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
24
25#else /* CONFIG_X86_32 */
26
27#define mb()	asm volatile("mfence" : : : "memory")
28#define rmb()	asm volatile("lfence" : : : "memory")
29#define wmb()	asm volatile("sfence" : : : "memory")
30
31#endif /* CONFIG_X86_32 */
32
33#define dma_rmb()	barrier()
34#define dma_wmb()	barrier()
35
36#include <asm-generic/barrier.h>
37
38#endif