| Paul Gortmaker | 34f2c0a | 2012-04-01 16:38:46 -0400 | [diff] [blame] | 1 | /* |
| 2 | * cmpxchg.h -- forked from asm/atomic.h with this copyright: |
| 3 | * |
| 4 | * Copyright 2010 Tilera Corporation. All Rights Reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation, version 2. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 13 | * NON INFRINGEMENT. See the GNU General Public License for |
| 14 | * more details. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #ifndef _ASM_TILE_CMPXCHG_H |
| 19 | #define _ASM_TILE_CMPXCHG_H |
| 20 | |
| 21 | #ifndef __ASSEMBLY__ |
| 22 | |
| 23 | /* Nonexistent functions intended to cause link errors. */ |
| 24 | extern unsigned long __xchg_called_with_bad_pointer(void); |
| 25 | extern unsigned long __cmpxchg_called_with_bad_pointer(void); |
| 26 | |
| 27 | #define xchg(ptr, x) \ |
| 28 | ({ \ |
| 29 | typeof(*(ptr)) __x; \ |
| 30 | switch (sizeof(*(ptr))) { \ |
| 31 | case 4: \ |
| 32 | __x = (typeof(__x))(typeof(__x-__x))atomic_xchg( \ |
| 33 | (atomic_t *)(ptr), \ |
| 34 | (u32)(typeof((x)-(x)))(x)); \ |
| 35 | break; \ |
| 36 | case 8: \ |
| 37 | __x = (typeof(__x))(typeof(__x-__x))atomic64_xchg( \ |
| 38 | (atomic64_t *)(ptr), \ |
| 39 | (u64)(typeof((x)-(x)))(x)); \ |
| 40 | break; \ |
| 41 | default: \ |
| 42 | __xchg_called_with_bad_pointer(); \ |
| 43 | } \ |
| 44 | __x; \ |
| 45 | }) |
| 46 | |
| 47 | #define cmpxchg(ptr, o, n) \ |
| 48 | ({ \ |
| 49 | typeof(*(ptr)) __x; \ |
| 50 | switch (sizeof(*(ptr))) { \ |
| 51 | case 4: \ |
| 52 | __x = (typeof(__x))(typeof(__x-__x))atomic_cmpxchg( \ |
| 53 | (atomic_t *)(ptr), \ |
| 54 | (u32)(typeof((o)-(o)))(o), \ |
| 55 | (u32)(typeof((n)-(n)))(n)); \ |
| 56 | break; \ |
| 57 | case 8: \ |
| 58 | __x = (typeof(__x))(typeof(__x-__x))atomic64_cmpxchg( \ |
| 59 | (atomic64_t *)(ptr), \ |
| 60 | (u64)(typeof((o)-(o)))(o), \ |
| 61 | (u64)(typeof((n)-(n)))(n)); \ |
| 62 | break; \ |
| 63 | default: \ |
| 64 | __cmpxchg_called_with_bad_pointer(); \ |
| 65 | } \ |
| 66 | __x; \ |
| 67 | }) |
| 68 | |
| 69 | #define tas(ptr) (xchg((ptr), 1)) |
| 70 | |
| 71 | #endif /* __ASSEMBLY__ */ |
| 72 | |
| 73 | #endif /* _ASM_TILE_CMPXCHG_H */ |