| [1] | 1 | /* |
|---|
| 2 | * hal_atomic.h - Generic Atomic Operations API definition. |
|---|
| [17] | 3 | * |
|---|
| [1] | 4 | * Authors Alain Greiner (2016) |
|---|
| 5 | * |
|---|
| 6 | * Copyright (c) UPMC Sorbonne Universites |
|---|
| [17] | 7 | * |
|---|
| [1] | 8 | * This file is part of ALMOS-MKH. |
|---|
| 9 | * |
|---|
| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
|---|
| 11 | * under the terms of the GNU General Public License as published by |
|---|
| 12 | * the Free Software Foundation; version 2.0 of the License. |
|---|
| 13 | * |
|---|
| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
|---|
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 17 | * General Public License for more details. |
|---|
| 18 | * |
|---|
| 19 | * You should have received a copy of the GNU General Public License |
|---|
| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
|---|
| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|---|
| 22 | */ |
|---|
| 23 | |
|---|
| 24 | #ifndef _HAL_ATOMIC_H_ |
|---|
| 25 | #define _HAL_ATOMIC_H_ |
|---|
| 26 | |
|---|
| [16] | 27 | #include <kernel_config.h> |
|---|
| [457] | 28 | #include <hal_kernel_types.h> |
|---|
| [1] | 29 | |
|---|
| 30 | ////////////////////////////////////////////////////////////////////////////////////////// |
|---|
| [17] | 31 | // Generic Atomic Operations API (implementation in hal_atomic.c) |
|---|
| [1] | 32 | // |
|---|
| [17] | 33 | // Atomic read-then-write operations depend on the CPU instruction set. |
|---|
| [1] | 34 | // ALMOS-MKH uses the following generic API. |
|---|
| 35 | ////////////////////////////////////////////////////////////////////////////////////////// |
|---|
| 36 | |
|---|
| 37 | /***************************************************************************************** |
|---|
| 38 | * This blocking function makes an atomic "and" between a 32 bits mask, and a 32 bits |
|---|
| 39 | * unsigned int shared variable, returning only when atomic operation is successful. |
|---|
| 40 | ***************************************************************************************** |
|---|
| 41 | * @ ptr : pointer on the shared variable |
|---|
| [17] | 42 | * @ val : mask value |
|---|
| [1] | 43 | ****************************************************************************************/ |
|---|
| 44 | void hal_atomic_and( uint32_t * ptr, |
|---|
| 45 | uint32_t val ); |
|---|
| 46 | |
|---|
| 47 | /***************************************************************************************** |
|---|
| 48 | * This blocking function makes an atomic "or" between a 32 bits mask, and a 32 bits |
|---|
| 49 | * unsigned int shared variable, returning only when atomic operation is successful. |
|---|
| 50 | ***************************************************************************************** |
|---|
| 51 | * @ ptr : pointer on the shared variable |
|---|
| 52 | * @ val : mask value |
|---|
| 53 | ****************************************************************************************/ |
|---|
| 54 | void hal_atomic_or( uint32_t * ptr, |
|---|
| 55 | uint32_t val ); |
|---|
| 56 | |
|---|
| 57 | /***************************************************************************************** |
|---|
| 58 | * This blocking function atomically adds a positive or negative value to a 32 bits |
|---|
| 59 | * signed or unsigned int shared variable, returning only when atomic add is successful. |
|---|
| 60 | ***************************************************************************************** |
|---|
| 61 | * @ ptr : pointer on the shared variable (signed or unsigned) |
|---|
| 62 | * @ val : signed value to add |
|---|
| 63 | * @ return shared variable value before add |
|---|
| 64 | ****************************************************************************************/ |
|---|
| [505] | 65 | int32_t hal_atomic_add( void * ptr, |
|---|
| 66 | int32_t val ); |
|---|
| [1] | 67 | |
|---|
| 68 | /***************************************************************************************** |
|---|
| [17] | 69 | * This NON blocking function makes an atomic Compare-And-Swap on a 32 bits unsigned int |
|---|
| [408] | 70 | * shared variable, returning a Boolean to indicate success. |
|---|
| [1] | 71 | ***************************************************************************************** |
|---|
| 72 | * @ ptr : pointer on the shared variable |
|---|
| 73 | * @ old : expected value for the shared variable |
|---|
| [108] | 74 | * @ new : value to be written if success |
|---|
| [408] | 75 | * @ return true if success. |
|---|
| [1] | 76 | ****************************************************************************************/ |
|---|
| 77 | bool_t hal_atomic_cas( uint32_t * ptr, |
|---|
| 78 | uint32_t old, |
|---|
| 79 | uint32_t new ); |
|---|
| 80 | |
|---|
| 81 | /***************************************************************************************** |
|---|
| [17] | 82 | * This non blocking function makes an atomic Test-if-zero-And-Set on a 32 bits unsigned |
|---|
| [1] | 83 | * int shared variable, returning a Boolean to indicate both success and atomicity. |
|---|
| 84 | ***************************************************************************************** |
|---|
| 85 | * @ ptr : pointer on the shared variable |
|---|
| [108] | 86 | * @ val : value to be written if success |
|---|
| [1] | 87 | * @ return true if (current == 0) and (access is atomic) |
|---|
| 88 | ****************************************************************************************/ |
|---|
| [17] | 89 | bool_t hal_atomic_test_set( uint32_t * ptr, |
|---|
| [1] | 90 | uint32_t val ); |
|---|
| 91 | |
|---|
| 92 | #endif /* _HAL_ATOMIC_H_ */ |
|---|
