/* Copyright (C) 2003-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Carlos O'Donell <carlos@baldric.uwo.ca>, 2005.

   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/>.  */

#include <stdint.h> /*  Required for type definitions e.g. uint8_t.  */

#ifndef _ATOMIC_MACHINE_H

#define _ATOMIC_MACHINE_H	1

typedef int8_t atomic8_t;

typedef uint8_t uatomic8_t;

typedef int_fast8_t atomic_fast8_t;

typedef uint_fast8_t uatomic_fast8_t;

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

/* prev = *addr;

   if (prev == old)

     *addr = new;

   return prev; */

/* Use the kernel atomic light weight syscalls on hppa.  */

#define _LWS "0xb0"

#define _LWS_CAS "0"

/* Note r31 is the link register.  */

#define _LWS_CLOBBER "r1", "r23", "r22", "r20", "r31", "memory"

/* String constant for -EAGAIN.  */

#define _ASM_EAGAIN "-11"

/* String constant for -EDEADLOCK.  */

#define _ASM_EDEADLOCK "-45"

/* The only basic operation needed is compare and exchange.  The mem

   pointer must be word aligned.  We no longer loop on deadlock.  */

#define atomic_compare_and_exchange_val_acq(mem, newval, oldval)	\

  ({									\

     register long lws_errno asm("r21");				\

     register unsigned long lws_ret asm("r28");				\

     register unsigned long lws_mem asm("r26") = (unsigned long)(mem);	\

     register unsigned long lws_old asm("r25") = (unsigned long)(oldval);\

     register unsigned long lws_new asm("r24") = (unsigned long)(newval);\

     __asm__ __volatile__(						\

	"0:					\n\t"			\

	"ble	" _LWS "(%%sr2, %%r0)		\n\t"			\

	"ldi	" _LWS_CAS ", %%r20		\n\t"			\

	"cmpiclr,<> " _ASM_EAGAIN ", %%r21, %%r0\n\t"			\

	"b,n 0b					\n\t"			\

	"cmpclr,= %%r0, %%r21, %%r0		\n\t"			\

	"iitlbp %%r0,(%%sr0, %%r0)		\n\t"			\

	: "=r" (lws_ret), "=r" (lws_errno)				\

	: "r" (lws_mem), "r" (lws_old), "r" (lws_new)			\

	: _LWS_CLOBBER							\

     );									\

									\

     (__typeof (oldval)) lws_ret;					\

   })

#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval)	\

  ({									\

     __typeof__ (*mem) ret;						\

     ret = atomic_compare_and_exchange_val_acq(mem, newval, oldval);	\

     /* Return 1 if it was already acquired.  */			\

     (ret != oldval);							\

   })

#endif

/* _ATOMIC_MACHINE_H */