1  /* Atomic operations.  OpenRISC version.
       2     Copyright (C) 2022-2023 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 __OR1K_ATOMIC_H_
      20  #define __OR1K_ATOMIC_H_
      21  
      22  #include <stdint.h>
      23  
      24  #define __HAVE_64B_ATOMICS 0
      25  #define USE_ATOMIC_COMPILER_BUILTINS 1
      26  #define ATOMIC_EXCHANGE_USES_CAS 1
      27  
      28  #define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
      29    (abort (), 0)
      30  
      31  #define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
      32    (abort (), 0)
      33  
      34  #define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
      35    ({                                                                    \
      36      typeof (*mem) __oldval = (oldval);                                  \
      37      !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
      38  				  model, __ATOMIC_RELAXED);             \
      39    })
      40  
      41  #define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
      42    (abort (), 0)
      43  
      44  #define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
      45    (abort (), (__typeof (*mem)) 0)
      46  
      47  #define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
      48    (abort (), (__typeof (*mem)) 0)
      49  
      50  #define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
      51    ({                                                                    \
      52      typeof (*mem) __oldval = (oldval);                                  \
      53      __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
      54  				 model, __ATOMIC_RELAXED);              \
      55      __oldval;                                                           \
      56    })
      57  
      58  #define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
      59    (abort (), (__typeof (*mem)) 0)
      60  
      61  #define atomic_compare_and_exchange_bool_acq(mem, new, old)		\
      62    __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,		\
      63  			mem, new, old, __ATOMIC_ACQUIRE)
      64  
      65  #define atomic_compare_and_exchange_val_acq(mem, new, old)		\
      66    __atomic_val_bysize (__arch_compare_and_exchange_val, int,		\
      67  		       mem, new, old, __ATOMIC_ACQUIRE)
      68  
      69  #define atomic_full_barrier() ({ asm volatile ("l.msync" ::: "memory"); })
      70  
      71  #endif /* atomic-machine.h */