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| 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 |
| 30 |
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