/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MATH64_H
#define _LINUX_MATH64_H

#include <linux/types.h>
#include <asm/div64.h>

#if BITS_PER_LONG == 64

#define div64_long(x, y) div64_s64((x), (y))
#define div64_ul(x, y)   div64_u64((x), (y))

/**
 * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
 *
 * This is commonly provided by 32bit archs to provide an optimized 64bit
 * divide.
 */
static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
        *remainder = dividend % divisor;
        return dividend / divisor;
}

/**
 * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
 */
static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
{
        *remainder = dividend % divisor;
        return dividend / divisor;
}

/**
 * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
 */
static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
{
        *remainder = dividend % divisor;
        return dividend / divisor;
}

/**
 * div64_u64 - unsigned 64bit divide with 64bit divisor
 */
static inline u64 div64_u64(u64 dividend, u64 divisor)
{
        return dividend / divisor;
}

/**
 * div64_s64 - signed 64bit divide with 64bit divisor
 */
static inline s64 div64_s64(s64 dividend, s64 divisor)
{
        return dividend / divisor;
}

#elif BITS_PER_LONG == 32

#define div64_long(x, y) div_s64((x), (y))
#define div64_ul(x, y)   div_u64((x), (y))

#ifndef div_u64_rem
static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
{
        *remainder = do_div(dividend, divisor);
        return dividend;
}
#endif

#ifndef div_s64_rem
extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
#endif

#ifndef div64_u64_rem
extern u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder);
#endif

#ifndef div64_u64
extern u64 div64_u64(u64 dividend, u64 divisor);
#endif

#ifndef div64_s64
extern s64 div64_s64(s64 dividend, s64 divisor);
#endif

#endif /* BITS_PER_LONG */

/**
 * div_u64 - unsigned 64bit divide with 32bit divisor
 *
 * This is the most common 64bit divide and should be used if possible,
 * as many 32bit archs can optimize this variant better than a full 64bit
 * divide.
 */
#ifndef div_u64
static inline u64 div_u64(u64 dividend, u32 divisor)
{
        u32 remainder;
        return div_u64_rem(dividend, divisor, &remainder);
}
#endif

/**
 * div_s64 - signed 64bit divide with 32bit divisor
 */
#ifndef div_s64
static inline s64 div_s64(s64 dividend, s32 divisor)
{
        s32 remainder;
        return div_s64_rem(dividend, divisor, &remainder);
}
#endif

u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);

static __always_inline u32
__iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder)
{
        u32 ret = 0;

        while (dividend >= divisor) {
                /* The following asm() prevents the compiler from
                   optimising this loop into a modulo operation.  */
                asm("" : "+rm"(dividend));

                dividend -= divisor;
                ret++;
        }

        *remainder = dividend;

        return ret;
}

#ifndef mul_u32_u32
/*
 * Many a GCC version messes this up and generates a 64x64 mult :-(
 */
static inline u64 mul_u32_u32(u32 a, u32 b)
{
        return (u64)a * b;
}
#endif

#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)

#ifndef mul_u64_u32_shr
static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
{
        return (u64)(((unsigned __int128)a * mul) >> shift);
}
#endif /* mul_u64_u32_shr */

#ifndef mul_u64_u64_shr
static inline u64 mul_u64_u64_shr(u64 a, u64 mul, unsigned int shift)
{
        return (u64)(((unsigned __int128)a * mul) >> shift);
}
#endif /* mul_u64_u64_shr */

#else

#ifndef mul_u64_u32_shr
static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
{
        u32 ah, al;
        u64 ret;

        al = a;
        ah = a >> 32;

        ret = mul_u32_u32(al, mul) >> shift;
        if (ah)
                ret += mul_u32_u32(ah, mul) << (32 - shift);

        return ret;
}
#endif /* mul_u64_u32_shr */

#ifndef mul_u64_u64_shr
static inline u64 mul_u64_u64_shr(u64 a, u64 b, unsigned int shift)
{
        union {
                u64 ll;
                struct {
#ifdef __BIG_ENDIAN
                        u32 high, low;
#else
                        u32 low, high;
#endif
                } l;
        } rl, rm, rn, rh, a0, b0;
        u64 c;

        a0.ll = a;
        b0.ll = b;

        rl.ll = mul_u32_u32(a0.l.low, b0.l.low);
        rm.ll = mul_u32_u32(a0.l.low, b0.l.high);
        rn.ll = mul_u32_u32(a0.l.high, b0.l.low);
        rh.ll = mul_u32_u32(a0.l.high, b0.l.high);

        /*
         * Each of these lines computes a 64-bit intermediate result into "c",
         * starting at bits 32-95.  The low 32-bits go into the result of the
         * multiplication, the high 32-bits are carried into the next step.
         */
        rl.l.high = c = (u64)rl.l.high + rm.l.low + rn.l.low;
        rh.l.low = c = (c >> 32) + rm.l.high + rn.l.high + rh.l.low;
        rh.l.high = (c >> 32) + rh.l.high;

        /*
         * The 128-bit result of the multiplication is in rl.ll and rh.ll,
         * shift it right and throw away the high part of the result.
         */
        if (shift == 0)
                return rl.ll;
        if (shift < 64)
                return (rl.ll >> shift) | (rh.ll << (64 - shift));
        return rh.ll >> (shift & 63);
}
#endif /* mul_u64_u64_shr */

#endif

#ifndef mul_u64_u32_div
static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 divisor)
{
        union {
                u64 ll;
                struct {
#ifdef __BIG_ENDIAN
                        u32 high, low;
#else
                        u32 low, high;
#endif
                } l;
        } u, rl, rh;

        u.ll = a;
        rl.ll = mul_u32_u32(u.l.low, mul);
        rh.ll = mul_u32_u32(u.l.high, mul) + rl.l.high;

        /* Bits 32-63 of the result will be in rh.l.low. */
        rl.l.high = do_div(rh.ll, divisor);

        /* Bits 0-31 of the result will be in rl.l.low. */
        do_div(rl.ll, divisor);

        rl.l.high = rh.l.low;
        return rl.ll;
}
#endif /* mul_u64_u32_div */

#endif /* _LINUX_MATH64_H */