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 #include <asm/barrier.h> 24 25 /* Nonexistent functions intended to cause compile errors. */ 26 extern void __xchg_called_with_bad_pointer(void) 27 __compiletime_error("Bad argument size for xchg"); 28 extern void __cmpxchg_called_with_bad_pointer(void) 29 __compiletime_error("Bad argument size for cmpxchg"); 30 31 #ifndef __tilegx__ 32 33 /* Note the _atomic_xxx() routines include a final mb(). */ 34 int _atomic_xchg(int *ptr, int n); 35 int _atomic_xchg_add(int *v, int i); 36 int _atomic_xchg_add_unless(int *v, int a, int u); 37 int _atomic_cmpxchg(int *ptr, int o, int n); 38 long long _atomic64_xchg(long long *v, long long n); 39 long long _atomic64_xchg_add(long long *v, long long i); 40 long long _atomic64_xchg_add_unless(long long *v, long long a, long long u); 41 long long _atomic64_cmpxchg(long long *v, long long o, long long n); 42 43 #define xchg(ptr, n) \ 44 ({ \ 45 if (sizeof(*(ptr)) != 4) \ 46 __xchg_called_with_bad_pointer(); \ 47 smp_mb(); \ 48 (typeof(*(ptr)))_atomic_xchg((int *)(ptr), (int)(n)); \ 49 }) 50 51 #define cmpxchg(ptr, o, n) \ 52 ({ \ 53 if (sizeof(*(ptr)) != 4) \ 54 __cmpxchg_called_with_bad_pointer(); \ 55 smp_mb(); \ 56 (typeof(*(ptr)))_atomic_cmpxchg((int *)ptr, (int)o, \ 57 (int)n); \ 58 }) 59 60 #define xchg64(ptr, n) \ 61 ({ \ 62 if (sizeof(*(ptr)) != 8) \ 63 __xchg_called_with_bad_pointer(); \ 64 smp_mb(); \ 65 (typeof(*(ptr)))_atomic64_xchg((long long *)(ptr), \ 66 (long long)(n)); \ 67 }) 68 69 #define cmpxchg64(ptr, o, n) \ 70 ({ \ 71 if (sizeof(*(ptr)) != 8) \ 72 __cmpxchg_called_with_bad_pointer(); \ 73 smp_mb(); \ 74 (typeof(*(ptr)))_atomic64_cmpxchg((long long *)ptr, \ 75 (long long)o, (long long)n); \ 76 }) 77 78 #else 79 80 #define xchg(ptr, n) \ 81 ({ \ 82 typeof(*(ptr)) __x; \ 83 smp_mb(); \ 84 switch (sizeof(*(ptr))) { \ 85 case 4: \ 86 __x = (typeof(__x))(unsigned long) \ 87 __insn_exch4((ptr), \ 88 (u32)(unsigned long)(n)); \ 89 break; \ 90 case 8: \ 91 __x = (typeof(__x)) \ 92 __insn_exch((ptr), (unsigned long)(n)); \ 93 break; \ 94 default: \ 95 __xchg_called_with_bad_pointer(); \ 96 break; \ 97 } \ 98 smp_mb(); \ 99 __x; \ 100 }) 101 102 #define cmpxchg(ptr, o, n) \ 103 ({ \ 104 typeof(*(ptr)) __x; \ 105 __insn_mtspr(SPR_CMPEXCH_VALUE, (unsigned long)(o)); \ 106 smp_mb(); \ 107 switch (sizeof(*(ptr))) { \ 108 case 4: \ 109 __x = (typeof(__x))(unsigned long) \ 110 __insn_cmpexch4((ptr), \ 111 (u32)(unsigned long)(n)); \ 112 break; \ 113 case 8: \ 114 __x = (typeof(__x))__insn_cmpexch((ptr), \ 115 (long long)(n)); \ 116 break; \ 117 default: \ 118 __cmpxchg_called_with_bad_pointer(); \ 119 break; \ 120 } \ 121 smp_mb(); \ 122 __x; \ 123 }) 124 125 #define xchg64 xchg 126 #define cmpxchg64 cmpxchg 127 128 #endif 129 130 #endif /* __ASSEMBLY__ */ 131 132 #endif /* _ASM_TILE_CMPXCHG_H */ 133