/*      $NetBSD: atomic_add.S,v 1.7 2020/08/06 10:00:21 skrll Exp $     */

/*-
 * Copyright (c) 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <machine/asm.h>
#include "atomic_op_asm.h"

RCSID("$NetBSD: atomic_add.S,v 1.7 2020/08/06 10:00:21 skrll Exp $")

        .text
        .set    noreorder
#ifdef _KERNEL_OPT
#include "opt_cputype.h"
#ifndef MIPS3_LOONGSON2F
        .set    noat
        .set    nomacro
#endif
#else /* _KERNEL_OPT */
        .set    noat
        .set    nomacro
#endif /* _KERNEL_OPT */


LEAF(_atomic_add_32)
#if defined(_MIPS_ARCH_OCTEONP) || defined(_MIPS_ARCH_OCTEON2)
        saa             a1, (a0)
#else
        LLSCSYNC
1:      INT_LL          t0, 0(a0)
         nop
        INT_ADDU        t0, a1
        INT_SC          t0, 0(a0)
        beq             t0, zero, 1b
         nop
#endif
        j               ra
         nop
END(_atomic_add_32)
ATOMIC_OP_ALIAS(atomic_add_32, _atomic_add_32)

LEAF(_atomic_add_32_nv)
        LLSCSYNC
1:      INT_LL          v0, 0(a0)
         nop
        INT_ADDU        v0, a1
        move            t0, v0
        INT_SC          t0, 0(a0)
        beq             t0, zero, 1b
         nop
        j               ra
         nop
END(_atomic_add_32_nv)
ATOMIC_OP_ALIAS(atomic_add_32_nv, _atomic_add_32_nv)

#if !defined(__mips_o32)
LEAF(_atomic_add_64)
#if defined(_MIPS_ARCH_OCTEONP) || defined(_MIPS_ARCH_OCTEON2)
        saad            a1, (a0)
#else
        LLSCSYNC
1:      REG_LL          t0, 0(a0)
         nop
        REG_ADDU        t0, a1
        REG_SC          t0, 0(a0)
        beq             t0, zero, 1b
         nop
#endif
        j               ra
         nop
END(_atomic_add_64)
ATOMIC_OP_ALIAS(atomic_add_64, _atomic_add_64)

LEAF(_atomic_add_64_nv)
        LLSCSYNC
1:      REG_LL          v0, 0(a0)
         nop
        REG_ADDU        v0, a1
        move            t0, v0
        REG_SC          t0, 0(a0)
        beq             t0, zero, 1b
         nop
        j               ra
         nop
END(_atomic_add_64_nv)
ATOMIC_OP_ALIAS(atomic_add_64_nv, _atomic_add_64_nv)
#endif

#ifdef _LP64
STRONG_ALIAS(_atomic_add_long,          _atomic_add_64)
STRONG_ALIAS(_atomic_add_long_nv,       _atomic_add_64_nv)
STRONG_ALIAS(_atomic_add_ptr,           _atomic_add_64)
STRONG_ALIAS(_atomic_add_ptr_nv,        _atomic_add_64_nv)
#else
STRONG_ALIAS(_atomic_add_long,          _atomic_add_32)
STRONG_ALIAS(_atomic_add_long_nv,       _atomic_add_32_nv)
STRONG_ALIAS(_atomic_add_ptr,           _atomic_add_32)
STRONG_ALIAS(_atomic_add_ptr_nv,        _atomic_add_32_nv)
#endif
STRONG_ALIAS(_atomic_add_int,           _atomic_add_32)
STRONG_ALIAS(_atomic_add_int_nv,        _atomic_add_32_nv)

ATOMIC_OP_ALIAS(atomic_add_int,         _atomic_add_int)
ATOMIC_OP_ALIAS(atomic_add_int_nv,      _atomic_add_int_nv)
ATOMIC_OP_ALIAS(atomic_add_ptr,         _atomic_add_ptr)
ATOMIC_OP_ALIAS(atomic_add_ptr_nv,      _atomic_add_ptr_nv)
ATOMIC_OP_ALIAS(atomic_add_long,        _atomic_add_long)
ATOMIC_OP_ALIAS(atomic_add_long_nv,     _atomic_add_long_nv)