/*-
 * Copyright (c) 2015-2024 Ruslan Bukin <br@bsdpad.com>
 * All rights reserved.
 *
 * Portions of this software were developed by SRI International and the
 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
 *
 * Portions of this software were developed by the University of Cambridge
 * Computer Laboratory as part of the CTSRD Project, with support from the
 * UK Higher Education Innovation Fund (HEIF).
 *
 * 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 AUTHOR 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 AUTHOR 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.
 */

#ifndef _MACHINE_ATOMIC_H_
#define _MACHINE_ATOMIC_H_

#include <sys/atomic_common.h>

#define fence() __asm __volatile("fence" ::: "memory");
#define mb()    fence()
#define rmb()   fence()
#define wmb()   fence()

static __inline int atomic_cmpset_8(__volatile uint8_t *, uint8_t, uint8_t);
static __inline int atomic_fcmpset_8(__volatile uint8_t *, uint8_t *, uint8_t);
static __inline int atomic_cmpset_16(__volatile uint16_t *, uint16_t, uint16_t);
static __inline int atomic_fcmpset_16(__volatile uint16_t *, uint16_t *,
    uint16_t);

#define ATOMIC_ACQ_REL(NAME, WIDTH)                                     \
static __inline  void                                                   \
atomic_##NAME##_acq_##WIDTH(__volatile uint##WIDTH##_t *p, uint##WIDTH##_t v)\
{                                                                       \
        atomic_##NAME##_##WIDTH(p, v);                                  \
        fence();                                                        \
}                                                                       \
                                                                        \
static __inline  void                                                   \
atomic_##NAME##_rel_##WIDTH(__volatile uint##WIDTH##_t *p, uint##WIDTH##_t v)\
{                                                                       \
        fence();                                                        \
        atomic_##NAME##_##WIDTH(p, v);                                  \
}

#define ATOMIC_CMPSET_ACQ_REL(WIDTH)                                    \
static __inline  int                                                    \
atomic_cmpset_acq_##WIDTH(__volatile uint##WIDTH##_t *p,                \
    uint##WIDTH##_t cmpval, uint##WIDTH##_t newval)                     \
{                                                                       \
        int retval;                                                     \
                                                                        \
        retval = atomic_cmpset_##WIDTH(p, cmpval, newval);              \
        fence();                                                        \
        return (retval);                                                \
}                                                                       \
                                                                        \
static __inline  int                                                    \
atomic_cmpset_rel_##WIDTH(__volatile uint##WIDTH##_t *p,                \
    uint##WIDTH##_t cmpval, uint##WIDTH##_t newval)                     \
{                                                                       \
        fence();                                                        \
        return (atomic_cmpset_##WIDTH(p, cmpval, newval));              \
}

#define ATOMIC_FCMPSET_ACQ_REL(WIDTH)                                   \
static __inline  int                                                    \
atomic_fcmpset_acq_##WIDTH(__volatile uint##WIDTH##_t *p,               \
    uint##WIDTH##_t *cmpval, uint##WIDTH##_t newval)                    \
{                                                                       \
        int retval;                                                     \
                                                                        \
        retval = atomic_fcmpset_##WIDTH(p, cmpval, newval);             \
        fence();                                                        \
        return (retval);                                                \
}                                                                       \
                                                                        \
static __inline  int                                                    \
atomic_fcmpset_rel_##WIDTH(__volatile uint##WIDTH##_t *p,               \
    uint##WIDTH##_t *cmpval, uint##WIDTH##_t newval)                    \
{                                                                       \
        fence();                                                        \
        return (atomic_fcmpset_##WIDTH(p, cmpval, newval));             \
}

ATOMIC_CMPSET_ACQ_REL(8);
ATOMIC_FCMPSET_ACQ_REL(8);

#define atomic_cmpset_char              atomic_cmpset_8
#define atomic_cmpset_acq_char          atomic_cmpset_acq_8
#define atomic_cmpset_rel_char          atomic_cmpset_rel_8
#define atomic_fcmpset_char             atomic_fcmpset_8
#define atomic_fcmpset_acq_char         atomic_fcmpset_acq_8
#define atomic_fcmpset_rel_char         atomic_fcmpset_rel_8

#define atomic_cmpset_short             atomic_cmpset_16
#define atomic_fcmpset_short            atomic_fcmpset_16

ATOMIC_CMPSET_ACQ_REL(16);
ATOMIC_FCMPSET_ACQ_REL(16);

#define atomic_load_acq_16      atomic_load_acq_16
static __inline uint16_t
atomic_load_acq_16(const volatile uint16_t *p)
{
        uint16_t ret;

        ret = *p;

        fence();

        return (ret);
}

static __inline void
atomic_store_rel_16(volatile uint16_t *p, uint16_t val)
{

        fence();

        *p = val;
}

#define atomic_cmpset_acq_short         atomic_cmpset_acq_16
#define atomic_fcmpset_acq_short        atomic_fcmpset_acq_16
#define atomic_load_acq_short           atomic_load_acq_16

#define atomic_cmpset_rel_short         atomic_cmpset_rel_16
#define atomic_fcmpset_rel_short        atomic_fcmpset_rel_16
#define atomic_store_rel_short          atomic_store_rel_16

static __inline void
atomic_add_32(volatile uint32_t *p, uint32_t val)
{

        __asm __volatile("amoadd.w zero, %1, %0"
                        : "+A" (*p)
                        : "r" (val)
                        : "memory");
}

static __inline void
atomic_subtract_32(volatile uint32_t *p, uint32_t val)
{

        __asm __volatile("amoadd.w zero, %1, %0"
                        : "+A" (*p)
                        : "r" (-val)
                        : "memory");
}

static __inline void
atomic_set_32(volatile uint32_t *p, uint32_t val)
{

        __asm __volatile("amoor.w zero, %1, %0"
                        : "+A" (*p)
                        : "r" (val)
                        : "memory");
}

static __inline void
atomic_clear_32(volatile uint32_t *p, uint32_t val)
{

        __asm __volatile("amoand.w zero, %1, %0"
                        : "+A" (*p)
                        : "r" (~val)
                        : "memory");
}

static __inline int
atomic_cmpset_32(volatile uint32_t *p, uint32_t cmpval, uint32_t newval)
{
        uint32_t tmp;
        int res;

        res = 0;

        __asm __volatile(
                "0:"
                        "li   %1, 1\n" /* Preset to fail */
                        "lr.w %0, %2\n"
                        "bne  %0, %z3, 1f\n"
                        "sc.w %1, %z4, %2\n"
                        "bnez %1, 0b\n"
                "1:"
                        : "=&r" (tmp), "=&r" (res), "+A" (*p)
                        : "rJ" ((long)(int32_t)cmpval), "rJ" (newval)
                        : "memory");

        return (!res);
}

static __inline int
atomic_fcmpset_32(volatile uint32_t *p, uint32_t *cmpval, uint32_t newval)
{
        uint32_t tmp;
        int res;

        res = 0;

        __asm __volatile(
                "0:"
                        "li   %1, 1\n"          /* Preset to fail */
                        "lr.w %0, %2\n"         /* Load old value */
                        "bne  %0, %z4, 1f\n"    /* Compare */
                        "sc.w %1, %z5, %2\n"    /* Try to store new value */
                        "j 2f\n"
                "1:"
                        "sw   %0, %3\n"         /* Save old value */
                "2:"
                        : "=&r" (tmp), "=&r" (res), "+A" (*p), "+A" (*cmpval)
                        : "rJ" ((long)(int32_t)*cmpval), "rJ" (newval)
                        : "memory");

        return (!res);
}

static __inline uint32_t
atomic_fetchadd_32(volatile uint32_t *p, uint32_t val)
{
        uint32_t ret;

        __asm __volatile("amoadd.w %0, %2, %1"
                        : "=&r" (ret), "+A" (*p)
                        : "r" (val)
                        : "memory");

        return (ret);
}

static __inline uint32_t
atomic_readandclear_32(volatile uint32_t *p)
{
        uint32_t ret;
        uint32_t val;

        val = 0;

        __asm __volatile("amoswap.w %0, %2, %1"
                        : "=&r"(ret), "+A" (*p)
                        : "r" (val)
                        : "memory");

        return (ret);
}

static __inline int
atomic_testandclear_32(volatile uint32_t *p, u_int val)
{
        uint32_t mask, old;

        mask = 1u << (val & 31);
        __asm __volatile("amoand.w %0, %2, %1"
                        : "=&r" (old), "+A" (*p)
                        : "r" (~mask)
                        : "memory");

        return ((old & mask) != 0);
}

static __inline int
atomic_testandset_32(volatile uint32_t *p, u_int val)
{
        uint32_t mask, old;

        mask = 1u << (val & 31);
        __asm __volatile("amoor.w %0, %2, %1"
                        : "=&r" (old), "+A" (*p)
                        : "r" (mask)
                        : "memory");

        return ((old & mask) != 0);
}

#define atomic_add_int          atomic_add_32
#define atomic_clear_int        atomic_clear_32
#define atomic_cmpset_int       atomic_cmpset_32
#define atomic_fcmpset_int      atomic_fcmpset_32
#define atomic_fetchadd_int     atomic_fetchadd_32
#define atomic_readandclear_int atomic_readandclear_32
#define atomic_set_int          atomic_set_32
#define atomic_subtract_int     atomic_subtract_32

ATOMIC_ACQ_REL(set, 32)
ATOMIC_ACQ_REL(clear, 32)
ATOMIC_ACQ_REL(add, 32)
ATOMIC_ACQ_REL(subtract, 32)

ATOMIC_CMPSET_ACQ_REL(32);
ATOMIC_FCMPSET_ACQ_REL(32);

static __inline uint32_t
atomic_load_acq_32(const volatile uint32_t *p)
{
        uint32_t ret;

        ret = *p;

        fence();

        return (ret);
}

static __inline void
atomic_store_rel_32(volatile uint32_t *p, uint32_t val)
{

        fence();

        *p = val;
}

#define atomic_add_acq_int      atomic_add_acq_32
#define atomic_clear_acq_int    atomic_clear_acq_32
#define atomic_cmpset_acq_int   atomic_cmpset_acq_32
#define atomic_fcmpset_acq_int  atomic_fcmpset_acq_32
#define atomic_load_acq_int     atomic_load_acq_32
#define atomic_set_acq_int      atomic_set_acq_32
#define atomic_subtract_acq_int atomic_subtract_acq_32

#define atomic_add_rel_int      atomic_add_rel_32
#define atomic_clear_rel_int    atomic_clear_rel_32
#define atomic_cmpset_rel_int   atomic_cmpset_rel_32
#define atomic_fcmpset_rel_int  atomic_fcmpset_rel_32
#define atomic_set_rel_int      atomic_set_rel_32
#define atomic_subtract_rel_int atomic_subtract_rel_32
#define atomic_store_rel_int    atomic_store_rel_32

static __inline void
atomic_add_64(volatile uint64_t *p, uint64_t val)
{

        __asm __volatile("amoadd.d zero, %1, %0"
                        : "+A" (*p)
                        : "r" (val)
                        : "memory");
}

static __inline void
atomic_subtract_64(volatile uint64_t *p, uint64_t val)
{

        __asm __volatile("amoadd.d zero, %1, %0"
                        : "+A" (*p)
                        : "r" (-val)
                        : "memory");
}

static __inline void
atomic_set_64(volatile uint64_t *p, uint64_t val)
{

        __asm __volatile("amoor.d zero, %1, %0"
                        : "+A" (*p)
                        : "r" (val)
                        : "memory");
}

static __inline void
atomic_clear_64(volatile uint64_t *p, uint64_t val)
{

        __asm __volatile("amoand.d zero, %1, %0"
                        : "+A" (*p)
                        : "r" (~val)
                        : "memory");
}

static __inline int
atomic_cmpset_64(volatile uint64_t *p, uint64_t cmpval, uint64_t newval)
{
        uint64_t tmp;
        int res;

        res = 0;

        __asm __volatile(
                "0:"
                        "li   %1, 1\n" /* Preset to fail */
                        "lr.d %0, %2\n"
                        "bne  %0, %z3, 1f\n"
                        "sc.d %1, %z4, %2\n"
                        "bnez %1, 0b\n"
                "1:"
                        : "=&r" (tmp), "=&r" (res), "+A" (*p)
                        : "rJ" (cmpval), "rJ" (newval)
                        : "memory");

        return (!res);
}

static __inline int
atomic_fcmpset_64(volatile uint64_t *p, uint64_t *cmpval, uint64_t newval)
{
        uint64_t tmp;
        int res;

        res = 0;

        __asm __volatile(
                "0:"
                        "li   %1, 1\n"          /* Preset to fail */
                        "lr.d %0, %2\n"         /* Load old value */
                        "bne  %0, %z4, 1f\n"    /* Compare */
                        "sc.d %1, %z5, %2\n"    /* Try to store new value */
                        "j 2f\n"
                "1:"
                        "sd   %0, %3\n"         /* Save old value */
                "2:"
                        : "=&r" (tmp), "=&r" (res), "+A" (*p), "+A" (*cmpval)
                        : "rJ" (*cmpval), "rJ" (newval)
                        : "memory");

        return (!res);
}

static __inline uint64_t
atomic_fetchadd_64(volatile uint64_t *p, uint64_t val)
{
        uint64_t ret;

        __asm __volatile("amoadd.d %0, %2, %1"
                        : "=&r" (ret), "+A" (*p)
                        : "r" (val)
                        : "memory");

        return (ret);
}

static __inline uint64_t
atomic_readandclear_64(volatile uint64_t *p)
{
        uint64_t ret;
        uint64_t val;

        val = 0;

        __asm __volatile("amoswap.d %0, %2, %1"
                        : "=&r"(ret), "+A" (*p)
                        : "r" (val)
                        : "memory");

        return (ret);
}

static __inline int
atomic_testandclear_64(volatile uint64_t *p, u_int val)
{
        uint64_t mask, old;

        mask = 1ul << (val & 63);
        __asm __volatile("amoand.d %0, %2, %1"
                        : "=&r" (old), "+A" (*p)
                        : "r" (~mask)
                        : "memory");

        return ((old & mask) != 0);
}

static __inline int
atomic_testandset_64(volatile uint64_t *p, u_int val)
{
        uint64_t mask, old;

        mask = 1ul << (val & 63);
        __asm __volatile("amoor.d %0, %2, %1"
                        : "=&r" (old), "+A" (*p)
                        : "r" (mask)
                        : "memory");

        return ((old & mask) != 0);
}

static __inline int
atomic_testandset_acq_64(volatile uint64_t *p, u_int val)
{
        uint64_t mask, old;

        mask = 1ul << (val & 63);
        __asm __volatile("amoor.d.aq %0, %2, %1"
                        : "=&r" (old), "+A" (*p)
                        : "r" (mask)
                        : "memory");

        return ((old & mask) != 0);
}

static __inline uint32_t
atomic_swap_32(volatile uint32_t *p, uint32_t val)
{
        uint32_t old;

        __asm __volatile("amoswap.w %0, %2, %1"
                        : "=&r"(old), "+A" (*p)
                        : "r" (val)
                        : "memory");

        return (old);
}

static __inline uint64_t
atomic_swap_64(volatile uint64_t *p, uint64_t val)
{
        uint64_t old;

        __asm __volatile("amoswap.d %0, %2, %1"
                        : "=&r"(old), "+A" (*p)
                        : "r" (val)
                        : "memory");

        return (old);
}

#define atomic_swap_int                 atomic_swap_32

#define atomic_add_long                 atomic_add_64
#define atomic_clear_long               atomic_clear_64
#define atomic_cmpset_long              atomic_cmpset_64
#define atomic_fcmpset_long             atomic_fcmpset_64
#define atomic_fetchadd_long            atomic_fetchadd_64
#define atomic_readandclear_long        atomic_readandclear_64
#define atomic_set_long                 atomic_set_64
#define atomic_subtract_long            atomic_subtract_64
#define atomic_swap_long                atomic_swap_64
#define atomic_testandclear_long        atomic_testandclear_64
#define atomic_testandset_long          atomic_testandset_64
#define atomic_testandset_acq_long      atomic_testandset_acq_64

#define atomic_add_ptr                  atomic_add_64
#define atomic_clear_ptr                atomic_clear_64
#define atomic_cmpset_ptr               atomic_cmpset_64
#define atomic_fcmpset_ptr              atomic_fcmpset_64
#define atomic_fetchadd_ptr             atomic_fetchadd_64
#define atomic_readandclear_ptr         atomic_readandclear_64
#define atomic_set_ptr                  atomic_set_64
#define atomic_subtract_ptr             atomic_subtract_64
#define atomic_swap_ptr                 atomic_swap_64
#define atomic_testandclear_ptr         atomic_testandclear_64
#define atomic_testandset_ptr           atomic_testandset_64

ATOMIC_ACQ_REL(set, 64)
ATOMIC_ACQ_REL(clear, 64)
ATOMIC_ACQ_REL(add, 64)
ATOMIC_ACQ_REL(subtract, 64)

ATOMIC_CMPSET_ACQ_REL(64);
ATOMIC_FCMPSET_ACQ_REL(64);

static __inline uint64_t
atomic_load_acq_64(const volatile uint64_t *p)
{
        uint64_t ret;

        ret = *p;

        fence();

        return (ret);
}

static __inline void
atomic_store_rel_64(volatile uint64_t *p, uint64_t val)
{

        fence();

        *p = val;
}

#define atomic_add_acq_long             atomic_add_acq_64
#define atomic_clear_acq_long           atomic_clear_acq_64
#define atomic_cmpset_acq_long          atomic_cmpset_acq_64
#define atomic_fcmpset_acq_long         atomic_fcmpset_acq_64
#define atomic_load_acq_long            atomic_load_acq_64
#define atomic_set_acq_long             atomic_set_acq_64
#define atomic_subtract_acq_long        atomic_subtract_acq_64

#define atomic_add_acq_ptr              atomic_add_acq_64
#define atomic_clear_acq_ptr            atomic_clear_acq_64
#define atomic_cmpset_acq_ptr           atomic_cmpset_acq_64
#define atomic_fcmpset_acq_ptr          atomic_fcmpset_acq_64
#define atomic_load_acq_ptr             atomic_load_acq_64
#define atomic_set_acq_ptr              atomic_set_acq_64
#define atomic_subtract_acq_ptr         atomic_subtract_acq_64

#undef ATOMIC_ACQ_REL

static __inline void
atomic_thread_fence_acq(void)
{

        fence();
}

static __inline void
atomic_thread_fence_rel(void)
{

        fence();
}

static __inline void
atomic_thread_fence_acq_rel(void)
{

        fence();
}

static __inline void
atomic_thread_fence_seq_cst(void)
{

        fence();
}

#define atomic_add_rel_long             atomic_add_rel_64
#define atomic_clear_rel_long           atomic_clear_rel_64

#define atomic_add_rel_long             atomic_add_rel_64
#define atomic_clear_rel_long           atomic_clear_rel_64
#define atomic_cmpset_rel_long          atomic_cmpset_rel_64
#define atomic_fcmpset_rel_long         atomic_fcmpset_rel_64
#define atomic_set_rel_long             atomic_set_rel_64
#define atomic_subtract_rel_long        atomic_subtract_rel_64
#define atomic_store_rel_long           atomic_store_rel_64

#define atomic_add_rel_ptr              atomic_add_rel_64
#define atomic_clear_rel_ptr            atomic_clear_rel_64
#define atomic_cmpset_rel_ptr           atomic_cmpset_rel_64
#define atomic_fcmpset_rel_ptr          atomic_fcmpset_rel_64
#define atomic_set_rel_ptr              atomic_set_rel_64
#define atomic_subtract_rel_ptr         atomic_subtract_rel_64
#define atomic_store_rel_ptr            atomic_store_rel_64

#include <sys/_atomic_subword.h>

#define atomic_set_short                atomic_set_16
#define atomic_clear_short              atomic_clear_16

#endif /* _MACHINE_ATOMIC_H_ */