projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a0616cde DH |
1 | /* |
| 2 | * Copyright IBM Corp. 1999, 2009 | |
| 3 | * | |
| 4 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
| 5 | */ | |
| 6 | ||
| 7 | #ifndef __ASM_BARRIER_H | |
| 8 | #define __ASM_BARRIER_H | |
| 9 | ||
| 10 | /* | |
| 11 | * Force strict CPU ordering. | |
| 12 | * And yes, this is required on UP too when we're talking | |
| 13 | * to devices. | |
| a0616cde DH |
14 | */ |
| 15 | ||
| e5b8d755 | 16 | #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES |
| e06ef372 | 17 | /* Fast-BCR without checkpoint synchronization */ |
| 44230282 | 18 | #define __ASM_BARRIER "bcr 14,0\n" |
| e5b8d755 | 19 | #else |
| 44230282 | 20 | #define __ASM_BARRIER "bcr 15,0\n" |
| e5b8d755 | 21 | #endif |
| c6f48b0b | 22 | |
| 44230282 HC |
23 | #define mb() do { asm volatile(__ASM_BARRIER : : : "memory"); } while (0) |
| 24 | ||
| c6f48b0b HC |
25 | #define rmb() mb() |
| 26 | #define wmb() mb() | |
| c6f48b0b HC |
27 | #define smp_mb() mb() |
| 28 | #define smp_rmb() rmb() | |
| 29 | #define smp_wmb() wmb() | |
| 8a449718 AD |
30 | |
| 31 | #define read_barrier_depends() do { } while (0) | |
| 32 | #define smp_read_barrier_depends() do { } while (0) | |
| 0e530747 PZ |
33 | |
| 34 | #define smp_mb__before_atomic() smp_mb() | |
| 35 | #define smp_mb__after_atomic() smp_mb() | |
| a0616cde | 36 | |
| c6f48b0b | 37 | #define set_mb(var, value) do { var = value; mb(); } while (0) |
| a0616cde | 38 | |
| 47933ad4 PZ |
39 | #define smp_store_release(p, v) \ |
| 40 | do { \ | |
| 41 | compiletime_assert_atomic_type(*p); \ | |
| 42 | barrier(); \ | |
| 43 | ACCESS_ONCE(*p) = (v); \ | |
| 44 | } while (0) | |
| 45 | ||
| 46 | #define smp_load_acquire(p) \ | |
| 47 | ({ \ | |
| 48 | typeof(*p) ___p1 = ACCESS_ONCE(*p); \ | |
| 49 | compiletime_assert_atomic_type(*p); \ | |
| 50 | barrier(); \ | |
| 51 | ___p1; \ | |
| 52 | }) | |
| 53 | ||
| a0616cde | 54 | #endif /* __ASM_BARRIER_H */ |