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Diffstat (limited to 'framework/include/libmetal/utilities.h')
-rw-r--r-- | framework/include/libmetal/utilities.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/framework/include/libmetal/utilities.h b/framework/include/libmetal/utilities.h new file mode 100644 index 0000000..e60f345 --- /dev/null +++ b/framework/include/libmetal/utilities.h @@ -0,0 +1,153 @@ +/* + * 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 <assert.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/** \defgroup utilities Simple Utilities + * @{ */ + +/** Marker for unused function arguments/variables. */ +#define metal_unused(x) do { (x) = (x); } while (0) + +/** Figure out number of elements in an array. */ +#define metal_dim(x) (sizeof(x) / sizeof(x[0])) + +/** Minimum of two numbers (warning: multiple evaluation!). */ +#define metal_min(x, y) ((x) < (y) ? (x) : (y)) + +/** Maximum of two numbers (warning: multiple evaluation!). */ +#define metal_max(x, y) ((x) > (y) ? (x) : (y)) + +/** Sign of a number [-1, 0, or 1] (warning: multiple evaluation!). */ +#define metal_sign(x) ((x) < 0 ? -1 : ((x) > 0 ? 1 : 0)) + +/** Align 'size' down to a multiple of 'align' (must be a power of two). */ +#define metal_align_down(size, align) \ + ((size) & ~((align) - 1)) + +/** Align 'size' up to a multiple of 'align' (must be a power of two). */ +#define metal_align_up(size, align) \ + metal_align_down((size) + (align) - 1, align) + +/** Divide (and round down). */ +#define metal_div_round_down(num, den) \ + ((num) / (den)) + +/** Divide (and round up). */ +#define metal_div_round_up(num, den) \ + metal_div_round_down((num) + (den) - 1, (den)) + +/** Align 'ptr' down to a multiple of 'align' (must be a power of two). */ +#define metal_ptr_align_down(ptr, align) \ + (void *)(metal_align_down((uintptr_t)(ptr), (uintptr_t)(align))) + +/** Align 'ptr' up to a multiple of 'align' (must be a power of two). */ +#define metal_ptr_align_up(ptr, align) \ + (void *)(metal_align_up((uintptr_t)(ptr), (uintptr_t)(align))) + +/** Compute offset of a field within a structure. */ +#define metal_offset_of(structure, member) \ + ((uintptr_t) &(((structure *) 0)->member)) + +/** Compute pointer to a structure given a pointer to one of its fields. */ +#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; + + assert((in & (in - 1)) == 0); + + for (result = 0; (1UL << result) < in; result ++) + ; + return result; +} + +/** @} */ + +#ifdef __cplusplus +} +#endif + +#endif /* __METAL_UTILITIES__H__ */ |