projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| a3a85a76 RW |
2 | #ifndef _ASM_UM_BARRIER_H_ |
| 3 | #define _ASM_UM_BARRIER_H_ | |
| 4 | ||
| 5 | #include <asm/asm.h> | |
| 6 | #include <asm/segment.h> | |
| cd4d09ec | 7 | #include <asm/cpufeatures.h> |
| a3a85a76 RW |
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 | ||
| a3a85a76 | 33 | #ifdef CONFIG_X86_PPRO_FENCE |
| 1077fa36 | 34 | #define dma_rmb() rmb() |
| a3a85a76 | 35 | #else /* CONFIG_X86_PPRO_FENCE */ |
| 1077fa36 | 36 | #define dma_rmb() barrier() |
| a3a85a76 | 37 | #endif /* CONFIG_X86_PPRO_FENCE */ |
| 1077fa36 | 38 | #define dma_wmb() barrier() |
| a3a85a76 | 39 | |
| 577f183a | 40 | #include <asm-generic/barrier.h> |
| 8a449718 | 41 | |
| a3a85a76 | 42 | #endif |