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| 1 | /* Low-level functions for atomic operations. Nios II version. |
|---|---|
| 2 | Copyright (C) 2012-2024 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library. If not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _NIOS2_ATOMIC_MACHINE_H |
| 20 | #define _NIOS2_ATOMIC_MACHINE_H 1 |
| 21 | |
| 22 | #define __HAVE_64B_ATOMICS 0 |
| 23 | #define USE_ATOMIC_COMPILER_BUILTINS 0 |
| 24 | |
| 25 | /* XXX Is this actually correct? */ |
| 26 | #define ATOMIC_EXCHANGE_USES_CAS 1 |
| 27 | |
| 28 | #define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \ |
| 29 | (abort (), (__typeof (*mem)) 0) |
| 30 | #define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \ |
| 31 | (abort (), (__typeof (*mem)) 0) |
| 32 | #define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ |
| 33 | (abort (), (__typeof (*mem)) 0) |
| 34 | |
| 35 | #define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \ |
| 36 | (abort (), 0) |
| 37 | #define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \ |
| 38 | (abort (), 0) |
| 39 | #define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \ |
| 40 | (abort (), 0) |
| 41 | |
| 42 | #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ |
| 43 | ({ \ |
| 44 | register int r2 asm ("r2"); \ |
| 45 | register int* r4 asm ("r4") = (int*)(mem); \ |
| 46 | register int r5 asm ("r5"); \ |
| 47 | register int r6 asm ("r6") = (int)(newval); \ |
| 48 | int retval, orig_oldval = (int)(oldval); \ |
| 49 | long kernel_cmpxchg = 0x1004; \ |
| 50 | while (1) \ |
| 51 | { \ |
| 52 | r5 = *r4; \ |
| 53 | if (r5 != orig_oldval) \ |
| 54 | { \ |
| 55 | retval = r5; \ |
| 56 | break; \ |
| 57 | } \ |
| 58 | asm volatile ("callr %1\n" \ |
| 59 | : "=r" (r2) \ |
| 60 | : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \ |
| 61 | : "ra", "memory"); \ |
| 62 | if (!r2) { retval = orig_oldval; break; } \ |
| 63 | } \ |
| 64 | (__typeof (*(mem))) retval; \ |
| 65 | }) |
| 66 | |
| 67 | #define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \ |
| 68 | ({ \ |
| 69 | register int r2 asm ("r2"); \ |
| 70 | register int *r4 asm ("r4") = (int*)(mem); \ |
| 71 | register int r5 asm ("r5") = (int)(oldval); \ |
| 72 | register int r6 asm ("r6") = (int)(newval); \ |
| 73 | long kernel_cmpxchg = 0x1004; \ |
| 74 | asm volatile ("callr %1\n" \ |
| 75 | : "=r" (r2) \ |
| 76 | : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \ |
| 77 | : "ra", "memory"); \ |
| 78 | r2; \ |
| 79 | }) |
| 80 | |
| 81 | #define atomic_full_barrier() ({ asm volatile ("sync"); }) |
| 82 | |
| 83 | #endif /* _NIOS2_ATOMIC_MACHINE_H */ |
| 84 |
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