/*
 * Copyright (c) 2010 Isilon Systems, Inc.
 * Copyright (c) 2010 iX Systems, Inc.
 * Copyright (c) 2010 Panasas, Inc.
 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org>
 * 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 unmodified, 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 ``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 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 _LINUX_KERNEL_H_
#define _LINUX_KERNEL_H_

#include <sys/stdarg.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include <linux/typecheck.h>
#include <linux/printk.h>

#include <sys/systm.h>
#include <sys/param.h>
#include <sys/libkern.h>
#include <sys/stat.h>
#include <sys/endian.h>

#define U8_MAX          ((u8)~0U)
#define U16_MAX         ((u16)~0U)
#define U32_MAX         ((u32)~0U)
#define U64_MAX         ((u64)~0ULL)
#define S64_MAX         ((s64)(U64_MAX>>1))

#include <machine/limits.h>     /* LONG_MAX etc... */

#undef  ALIGN
#define ALIGN(x, y)             roundup2((x), (y))
#define IS_ALIGNED(x, y)        (((x) & ((y) - 1)) == 0)
#define DIV_ROUND_UP            howmany
#define DIV_ROUND_UP_ULL(X, N)  DIV_ROUND_UP((unsigned long long)(X), (N))
#define DIV_ROUND_DOWN_ULL(x, n) (((unsigned long long)(x) / (n)) * (n))

#define udelay(t)               DELAY(t)

#define container_of(ptr, type, member)                         \
({                                                              \
        __typeof(((type *)0)->member) *_p = (ptr);              \
        (type *)((char *)_p - offsetof(type, member));          \
})
  
#define ARRAY_SIZE(x)   (sizeof(x) / sizeof((x)[0]))

#define simple_strtoul  strtoul
#define simple_strtol   strtol

#define min(x, y)                       ((x) < (y) ? (x) : (y))
#define max(x, y)                       ((x) > (y) ? (x) : (y))

#define min3(a, b, c)                   min(a, min(b,c))
#define max3(a, b, c)                   max(a, max(b,c))

#define min_t(type, _x, _y)             ((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y))
#define max_t(type, _x, _y)             ((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y))

#define clamp_t(type, _x, min, max)     min_t(type, max_t(type, _x, min), max)
#define clamp(x, lo, hi)                min( max(x,lo), hi)
#define clamp_val(val, lo, hi)          clamp_t(typeof(val), val, lo, hi)

/*
 * This looks more complex than it should be. But we need to
 * get the type for the ~ right in round_down (it needs to be
 * as wide as the result!), and we want to evaluate the macro
 * arguments just once each.
 */
#define __round_mask(x, y) ((__typeof__(x))((y)-1))
#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
#define round_down(x, y) ((x) & ~__round_mask(x, y))

#define num_possible_cpus()     mp_ncpus

typedef struct pm_message {
        int event;
} pm_message_t;

/* Swap values of a and b */
#define swap(a, b)                      \
({                                      \
        typeof(a) _swap_tmp = a;        \
        a = b;                          \
        b = _swap_tmp;                  \
})

#define DIV_ROUND_CLOSEST(x, divisor)   (((x) + ((divisor) /2)) / (divisor))

static inline uintmax_t
mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor)
{
        uintmax_t q = (x / divisor);
        uintmax_t r = (x % divisor);

        return ((q * multiplier) + ((r * multiplier) / divisor));
}

static inline int64_t abs64(int64_t x)
{
        return (x < 0 ? -x : x);
}

#define DIV_ROUND_CLOSEST_ULL(ll, d)    \
 ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; })

#define upper_32_bits(n)        ((u32)(((n) >> 16) >> 16))
#define lower_32_bits(n)        ((u32)(n))

/* Byteorder compat layer */
#if _BYTE_ORDER == _BIG_ENDIAN
#define __BIG_ENDIAN 4321
#else
#define __LITTLE_ENDIAN 1234
#endif

#define cpu_to_le16(x)  htole16(x)
#define le16_to_cpu(x)  le16toh(x)
#define cpu_to_le32(x)  htole32(x)
#define le32_to_cpu(x)  le32toh(x)
#define le32_to_cpup(x) le32toh(*x)

#define cpu_to_be16(x)  htobe16(x)
#define be16_to_cpu(x)  be16toh(x)
#define cpu_to_be32(x)  htobe32(x)
#define be32_to_cpu(x)  be32toh(x)
#define be32_to_cpup(x) be32toh(*x)

static inline int __must_check
kstrtouint(const char *s, unsigned int base, unsigned int *res)
{
        *(res) = strtol(s,0,base);

        return 0;
}

char *kvasprintf(int flags, const char *format, va_list ap);
char *kasprintf(int flags, const char *format, ...);

static inline void __user *
u64_to_user_ptr(u64 address)
{
        return (void __user *)(uintptr_t)address;
}

static inline void
might_sleep(void)
{
}

#define might_sleep_if(cond)

#define snprintf        ksnprintf
#define sprintf         ksprintf

static inline int __printf(3, 0)
vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
        return kvsnprintf(buf, size, fmt, args);
}

static inline int __printf(3, 0)
vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
        int ret;

        if (size == 0)
                return 0;

        ret = vsnprintf(buf, size, fmt, args);
        if (ret < size)
                return ret;

        return size - 1;
}

static inline int __printf(3, 4)
scnprintf(char *buf, size_t size, const char *fmt, ...)
{
        va_list args;
        int i;

        va_start(args, fmt);
        i = vscnprintf(buf, size, fmt, args);
        va_end(args);

        return (i);
}

static inline int
kstrtol(const char *cp, unsigned int base, long *res)
{
        char *end;

        *res = strtol(cp, &end, base);

        /* skip newline character, if any */
        if (*end == '\n')
                end++;
        if (*cp == 0 || *end != 0)
                return (-EINVAL);
        return (0);
}

#define oops_in_progress        (panicstr != NULL)

enum lockdep_ok {
        LOCKDEP_STILL_OK,
        LOCKDEP_NOW_UNRELIABLE
};

#define TAINT_MACHINE_CHECK     4
#define TAINT_WARN              5

static inline void
add_taint(unsigned flag, enum lockdep_ok lo)
{
}

#define STUB() do { kprintf("%s: stub\n", __func__); } while(0);

#endif  /* _LINUX_KERNEL_H_ */