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 */ 74