/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (c) 2014, STMicroelectronics International N.V.
 * 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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 UTIL_H
#define UTIL_H

#include <compiler.h>
#include <stdint.h>

#define SIZE_4K	UINTPTR_C(0x1000)
#define SIZE_1M	UINTPTR_C(0x100000)
#define SIZE_2M	UINTPTR_C(0x200000)
#define SIZE_4M	UINTPTR_C(0x400000)
#define SIZE_8M	UINTPTR_C(0x800000)
#define SIZE_2G	UINTPTR_C(0x80000000)

#ifndef MAX
#define MAX(a, b) \
	(__extension__({ __typeof__(a) _a = (a); \
	   __typeof__(b) _b = (b); \
	 _a > _b ? _a : _b; }))

#define MIN(a, b) \
	(__extension__({ __typeof__(a) _a = (a); \
	   __typeof__(b) _b = (b); \
	 _a < _b ? _a : _b; }))
#endif

#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))

#ifndef ASM
/* Round up the even multiple of size, size has to be a multiple of 2 */
#define ROUNDUP(v, size) (((v) + ((__typeof__(v))(size) - 1)) & \
			  ~((__typeof__(v))(size) - 1))

/* Round down the even multiple of size, size has to be a multiple of 2 */
#define ROUNDDOWN(v, size) ((v) & ~((__typeof__(v))(size) - 1))
#else
#define ROUNDUP(x, y)			((((x) + (y) - 1) / (y)) * (y))
#define ROUNDDOWN(x, y)		(((x) / (y)) * (y))
#endif

/* x has to be of an unsigned type */
#define IS_POWER_OF_TWO(x) (((x) != 0) && (((x) & (~(x) + 1)) == (x)))

#define ALIGNMENT_IS_OK(p, type) \
	(((uintptr_t)(p) & (__alignof__(type) - 1)) == 0)

#define TO_STR(x) _TO_STR(x)
#define _TO_STR(x) #x

#define container_of(ptr, type, member) \
	(__extension__({ \
		const typeof(((type *)0)->member) *__ptr = (ptr); \
		(type *)((unsigned long)(__ptr) - offsetof(type, member)); \
	}))

#define MEMBER_SIZE(type, member) sizeof(((type *)0)->member)

#ifdef ASM
#define BIT32(nr)		(1 << (nr))
#define BIT64(nr)		(1 << (nr))
#define SHIFT_U32(v, shift)	((v) << (shift))
#define SHIFT_U64(v, shift)	((v) << (shift))
#else
#define BIT32(nr)		(UINT32_C(1) << (nr))
#define BIT64(nr)		(UINT64_C(1) << (nr))
#define SHIFT_U32(v, shift)	((uint32_t)(v) << (shift))
#define SHIFT_U64(v, shift)	((uint64_t)(v) << (shift))
#endif
#define BIT(nr)			BIT32(nr)

/*
 * Create a contiguous bitmask starting at bit position @l and ending at
 * position @h. For example
 * GENMASK_64(39, 21) gives us the 64bit vector 0x000000ffffe00000.
 */
#define GENMASK_32(h, l) \
	(((~UINT32_C(0)) << (l)) & (~UINT32_C(0) >> (32 - 1 - (h))))

#define GENMASK_64(h, l) \
	(((~UINT64_C(0)) << (l)) & (~UINT64_C(0) >> (64 - 1 - (h))))

/*
 * Checking overflow for addition, subtraction and multiplication. Result
 * of operation is stored in res which is a pointer to some kind of
 * integer.
 *
 * The macros return true if an overflow occurred and *res is undefined.
 */
#define ADD_OVERFLOW(a, b, res) __compiler_add_overflow((a), (b), (res))
#define SUB_OVERFLOW(a, b, res) __compiler_sub_overflow((a), (b), (res))
#define MUL_OVERFLOW(a, b, res) __compiler_mul_overflow((a), (b), (res))

/* Return a signed +1, 0 or -1 value based on data comparison */
#define CMP_TRILEAN(a, b) \
	(__extension__({ \
		__typeof__(a) _a = (a); \
		__typeof__(b) _b = (b); \
		\
		_a > _b ? 1 : _a < _b ? -1 : 0; \
	}))

#endif /*UTIL_H*/