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/* Copyright (C) 2011, 2012

   Free Software Foundation, Inc.

   Contributed by Walter Lee (walt@tilera.com)

   This file is part of the GNU OpenMP Library (libgomp).

   Libgomp is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   Libgomp 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 General Public License for

   more details.

   Under Section 7 of GPL version 3, you are granted additional

   permissions described in the GCC Runtime Library Exception, version

   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and

   a copy of the GCC Runtime Library Exception along with this program;

   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

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

/* Provide target-specific access to the futex system call.  */

#include <sys/syscall.h>

#include <linux/futex.h>

static inline void

sys_futex0 (int *addr, int op, int val)

{

  long _sys_result;

  long _clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10;

  int err;

  __asm__ __volatile__ (

    "swint1"

    : "=R00" (_sys_result), "=R01" (err), "=R02" (_clobber_r2),

      "=R03" (_clobber_r3), "=R04" (_clobber_r4), "=R05" (_clobber_r5),

      "=R10" (_clobber_r10)

    : "R10" (SYS_futex), "R00" (addr), "R01" (op), "R02" (val),

      "R03" (0)

    :  "r6",  "r7",

       "r8",  "r9",        "r11", "r12", "r13", "r14", "r15",

      "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",

      "r24", "r25", "r26", "r27", "r28", "r29", "memory");

}

static inline void

futex_wait (int *addr, int val)

{

  sys_futex0 (addr, FUTEX_WAIT, val);

}

static inline void

futex_wake (int *addr, int count)

{

  sys_futex0 (addr, FUTEX_WAKE, count);

}

static inline void

cpu_relax (void)

{

  __asm volatile ("" : : : "memory");

}

static inline void

atomic_write_barrier (void)

{

  __sync_synchronize ();

}