1#ifndef _ASM_UM_BARRIER_H_
 2#define _ASM_UM_BARRIER_H_
 3
 4#include <asm/asm.h>
 5#include <asm/segment.h>
 6#include <asm/cpufeatures.h>
 7#include <asm/cmpxchg.h>
 8#include <asm/nops.h>
 9
10#include <linux/kernel.h>
11#include <linux/irqflags.h>
12
13/*
14 * Force strict CPU ordering.
15 * And yes, this is required on UP too when we're talking
16 * to devices.
17 */
18#ifdef CONFIG_X86_32
19
20#define mb()	alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
21#define rmb()	alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
22#define wmb()	alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
23
24#else /* CONFIG_X86_32 */
25
26#define mb()	asm volatile("mfence" : : : "memory")
27#define rmb()	asm volatile("lfence" : : : "memory")
28#define wmb()	asm volatile("sfence" : : : "memory")
29
30#endif /* CONFIG_X86_32 */
31
32#ifdef CONFIG_X86_PPRO_FENCE
33#define dma_rmb()	rmb()
34#else /* CONFIG_X86_PPRO_FENCE */
35#define dma_rmb()	barrier()
36#endif /* CONFIG_X86_PPRO_FENCE */
37#define dma_wmb()	barrier()
38
39#include <asm-generic/barrier.h>
40
41#endif

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