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Diffstat (limited to 'sys/compat/linuxkpi/common/include/linux/math.h')
| -rw-r--r-- | sys/compat/linuxkpi/common/include/linux/math.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/linux/math.h b/sys/compat/linuxkpi/common/include/linux/math.h new file mode 100644 index 000000000000..5a348a57747b --- /dev/null +++ b/sys/compat/linuxkpi/common/include/linux/math.h @@ -0,0 +1,76 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2013-2015 Mellanox Technologies, Ltd. + * Copyright (c) 2014-2015 François Tigeot + * Copyright (c) 2016 Matt Macy <mmacy@FreeBSD.org> + * Copyright (c) 2019 Johannes Lundberg <johalun@FreeBSD.org> + * Copyright (c) 2023 Serenity Cyber Security, LLC. + * + * 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 _LINUXKPI_LINUX_MATH_H_ +#define _LINUXKPI_LINUX_MATH_H_ + +#include <linux/types.h> + +/* + * 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 DIV_ROUND_UP(x, n) howmany(x, n) +#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)) + +#define DIV_ROUND_CLOSEST(x, divisor) (((x) + ((divisor) / 2)) / (divisor)) +#define DIV_ROUND_CLOSEST_ULL(x, divisor) ({ \ + __typeof(divisor) __d = (divisor); \ + unsigned long long __ret = (x) + (__d) / 2; \ + __ret /= __d; \ + __ret; \ +}) + +#if defined(LINUXKPI_VERSION) && LINUXKPI_VERSION >= 60600 +#define abs_diff(x, y) ({ \ + __typeof(x) _x = (x); \ + __typeof(y) _y = (y); \ + _x > _y ? _x - _y : _y - _x; \ +}) +#endif + +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)); +} + +#endif /* _LINUXKPI_LINUX_MATH_H_ */ |