/* Low-level functions for atomic operations. Nios II version.

   Copyright (C) 2012-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library.  If not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _NIOS2_ATOMIC_MACHINE_H

#define _NIOS2_ATOMIC_MACHINE_H 1

#include <stdint.h>

typedef int32_t atomic32_t;

typedef uint32_t uatomic32_t;

typedef int_fast32_t atomic_fast32_t;

typedef uint_fast32_t uatomic_fast32_t;

typedef intptr_t atomicptr_t;

typedef uintptr_t uatomicptr_t;

typedef intmax_t atomic_max_t;

typedef uintmax_t uatomic_max_t;

#define __HAVE_64B_ATOMICS 0

#define USE_ATOMIC_COMPILER_BUILTINS 0

/* XXX Is this actually correct?  */

#define ATOMIC_EXCHANGE_USES_CAS 1

#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval)	\

  (abort (), (__typeof (*mem)) 0)

#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval)	\

  (abort (), (__typeof (*mem)) 0)

#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval)	\

  (abort (), (__typeof (*mem)) 0)

#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval)	\

  (abort (), 0)

#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval)	\

  (abort (), 0)

#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval)	\

  (abort (), 0)

#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval)	\

  ({									\

     register int r2 asm ("r2");					\

     register int* r4 asm ("r4") = (int*)(mem);				\

     register int r5 asm ("r5");					\

     register int r6 asm ("r6") = (int)(newval);			\

     int retval, orig_oldval = (int)(oldval);				\

     long kernel_cmpxchg = 0x1004;					\

     while (1)								\

       {								\

         r5 = *r4;							\

	 if (r5 != orig_oldval)						\

	   {								\

	     retval = r5;						\

	     break;							\

	   }								\

	 asm volatile ("callr %1\n"					\

		       : "=r" (r2)					\

		       : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \

		       : "ra", "memory");				\

	 if (!r2) { retval = orig_oldval; break; }			\

       }								\

     (__typeof (*(mem))) retval;					\

  })

#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval)	\

  ({									\

     register int r2 asm ("r2");					\

     register int *r4 asm ("r4") = (int*)(mem);				\

     register int r5 asm ("r5") = (int)(oldval);			\

     register int r6 asm ("r6") = (int)(newval);			\

     long kernel_cmpxchg = 0x1004;					\

     asm volatile ("callr %1\n"						\

		   : "=r" (r2)						\

		   : "r" (kernel_cmpxchg), "r" (r4), "r" (r5), "r" (r6) \

		   : "ra", "memory");					\

     r2;								\

  })

#define atomic_full_barrier()  ({ asm volatile ("sync"); })

#endif /* _NIOS2_ATOMIC_MACHINE_H */