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28 lines
747 B
28 lines
747 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_UM_BARRIER_H_ |
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#define _ASM_UM_BARRIER_H_ |
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#include <asm/alternative.h> |
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/* |
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* Force strict CPU ordering. |
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* And yes, this is required on UP too when we're talking |
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* to devices. |
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*/ |
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#ifdef CONFIG_X86_32 |
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#define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2) |
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#define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2) |
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#define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM) |
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#else /* CONFIG_X86_32 */ |
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#define mb() asm volatile("mfence" : : : "memory") |
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#define rmb() asm volatile("lfence" : : : "memory") |
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#define wmb() asm volatile("sfence" : : : "memory") |
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#endif /* CONFIG_X86_32 */ |
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#include <asm-generic/barrier.h> |
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#endif
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