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