utilities.h

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/*
 * Copyright (c) 2015, Xilinx Inc. and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
 
/*
 * @file        utilities.h
 * @brief       Utility routines for libmetal.
 */
 
#ifndef __METAL_UTILITIES__H__
#define __METAL_UTILITIES__H__
 
#include <stdint.h>
#include <limits.h>
#include <metal/assert.h>
 
#ifdef __cplusplus
extern "C" {
#endif


#define metal_unused(x) do { (x) = (x); } while (0)

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

#define metal_min(x, y) ((x) < (y) ? (x) : (y))

#define metal_max(x, y) ((x) > (y) ? (x) : (y))

#define metal_sign(x)   ((x) < 0 ? -1 : ((x) > 0 ? 1 : 0))

#define metal_align_down(size, align)                   \
        ((size) & ~((align) - 1))

#define metal_align_up(size, align)                     \
        metal_align_down((size) + (align) - 1, align)

#define metal_div_round_down(num, den)                  \
        ((num) / (den))

#define metal_div_round_up(num, den)                    \
        metal_div_round_down((num) + (den) - 1, (den))

#define metal_ptr_align_down(ptr, align)                \
        (void *)(metal_align_down((uintptr_t)(ptr), (uintptr_t)(align)))

#define metal_ptr_align_up(ptr, align)                  \
        (void *)(metal_align_up((uintptr_t)(ptr), (uintptr_t)(align)))

#define metal_offset_of(structure, member)              \
        ((uintptr_t)&(((structure *)0)->member))

#define metal_container_of(ptr, structure, member)      \
        (void *)((uintptr_t)(ptr) - metal_offset_of(structure, member))
 
#define METAL_BITS_PER_ULONG    (CHAR_BIT * sizeof(unsigned long))
 
#define metal_bit(bit)          (1UL << (bit))
 
#define metal_bitmap_longs(x)   metal_div_round_up((x), METAL_BITS_PER_ULONG)
 
static inline void metal_bitmap_set_bit(unsigned long *bitmap, int bit)
{
        bitmap[bit / METAL_BITS_PER_ULONG] |=
                metal_bit(bit & (METAL_BITS_PER_ULONG - 1));
}
 
static inline int metal_bitmap_is_bit_set(unsigned long *bitmap, int bit)
{
        return ((bitmap[bit / METAL_BITS_PER_ULONG] &
                metal_bit(bit & (METAL_BITS_PER_ULONG - 1))) == 0) ? 0 : 1;
}
 
static inline void metal_bitmap_clear_bit(unsigned long *bitmap, int bit)
{
        bitmap[bit / METAL_BITS_PER_ULONG] &=
                ~metal_bit(bit & (METAL_BITS_PER_ULONG - 1));
}
 
static inline int metal_bitmap_is_bit_clear(unsigned long *bitmap, int bit)
{
        return !metal_bitmap_is_bit_set(bitmap, bit);
}
 
static inline unsigned int
metal_bitmap_next_set_bit(unsigned long *bitmap, unsigned int start,
                          unsigned int max)
{
        unsigned int bit;
 
        for (bit = start;
             bit < max && !metal_bitmap_is_bit_set(bitmap, bit);
             bit++)
                ;
        return bit;
}
 
#define metal_bitmap_for_each_set_bit(bitmap, bit, max)                 \
        for ((bit) = metal_bitmap_next_set_bit((bitmap), 0, (max));     \
             (bit) < (max);                                             \
             (bit) = metal_bitmap_next_set_bit((bitmap), (bit + 1), (max)))
 
static inline unsigned int
metal_bitmap_next_clear_bit(unsigned long *bitmap, unsigned int start,
                            unsigned int max)
{
        unsigned int bit;
 
        for (bit = start;
             bit < max && !metal_bitmap_is_bit_clear(bitmap, bit);
             bit++)
                ;
        return bit;
}
 
#define metal_bitmap_for_each_clear_bit(bitmap, bit, max)               \
        for ((bit) = metal_bitmap_next_clear_bit((bitmap), 0, (max));   \
             (bit) < (max);                                             \
             (bit) = metal_bitmap_next_clear_bit((bitmap), (bit + 1), (max)))
 
static inline unsigned long metal_log2(unsigned long in)
{
        unsigned long result;
 
        metal_assert((in & (in - 1)) == 0);
 
        for (result = 0; (1UL << result) < in; result++)
                ;
        return result;
}

 
#ifdef __cplusplus
}
#endif
 
#endif /* __METAL_UTILITIES__H__ */