1 /* 2 Copyright (c) 2013, The Regents of the University of California (Regents). 3 All Rights Reserved. 4 5 Redistribution and use in source and binary forms, with or without 6 modification, are permitted provided that the following conditions are met: 7 1. Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 9 2. Redistributions in binary form must reproduce the above copyright 10 notice, this list of conditions and the following disclaimer in the 11 documentation and/or other materials provided with the distribution. 12 3. Neither the name of the Regents nor the 13 names of its contributors may be used to endorse or promote products 14 derived from this software without specific prior written permission. 15 16 IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, 17 SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING 18 OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS 19 BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 20 21 REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED 24 HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE 25 MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 26 */ 27 28 /*********************************************************************************** 29 * Record of Microchip changes 30 */ 31 32 #ifndef RISCV_ATOMIC_H 33 #define RISCV_ATOMIC_H 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 #define mb() __asm__ volatile ("fence" ::: "memory") 40 #define atomic_set(ptr, val) (*(volatile typeof(*(ptr)) *)(ptr) = val) 41 #define atomic_read(ptr) (*(volatile typeof(*(ptr)) *)(ptr)) 42 43 #ifdef __riscv_atomic 44 # define atomic_swap(ptr, swp) __sync_lock_test_and_set(ptr, swp) 45 # define atomic_or(ptr, inc) __sync_fetch_and_or(ptr, inc) 46 #else 47 #define atomic_binop(ptr, inc, op) ({ \ 48 long flags = disable_irqsave(); \ 49 typeof(*(ptr)) res = atomic_read(ptr); \ 50 atomic_set(ptr, op); \ 51 enable_irqrestore(flags); \ 52 res; }) 53 #define atomic_or(ptr, inc) atomic_binop(ptr, inc, res | (inc)) 54 #define atomic_swap(ptr, swp) atomic_binop(ptr, swp, (swp)) 55 #endif 56 57 #ifdef __cplusplus 58 } 59 #endif 60 61 #endif //RISCV_ATOMIC_H 62 63
