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582 lines
22 KiB
582 lines
22 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_BITMAP_H |
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#define __LINUX_BITMAP_H |
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#ifndef __ASSEMBLY__ |
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#include <linux/types.h> |
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#include <linux/bitops.h> |
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#include <linux/string.h> |
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#include <linux/kernel.h> |
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/* |
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* bitmaps provide bit arrays that consume one or more unsigned |
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* longs. The bitmap interface and available operations are listed |
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* here, in bitmap.h |
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* |
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* Function implementations generic to all architectures are in |
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* lib/bitmap.c. Functions implementations that are architecture |
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* specific are in various include/asm-<arch>/bitops.h headers |
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* and other arch/<arch> specific files. |
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* |
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* See lib/bitmap.c for more details. |
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*/ |
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/** |
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* DOC: bitmap overview |
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* |
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* The available bitmap operations and their rough meaning in the |
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* case that the bitmap is a single unsigned long are thus: |
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* |
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* The generated code is more efficient when nbits is known at |
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* compile-time and at most BITS_PER_LONG. |
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* |
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* :: |
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* |
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* bitmap_zero(dst, nbits) *dst = 0UL |
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* bitmap_fill(dst, nbits) *dst = ~0UL |
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* bitmap_copy(dst, src, nbits) *dst = *src |
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* bitmap_and(dst, src1, src2, nbits) *dst = *src1 & *src2 |
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* bitmap_or(dst, src1, src2, nbits) *dst = *src1 | *src2 |
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* bitmap_xor(dst, src1, src2, nbits) *dst = *src1 ^ *src2 |
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* bitmap_andnot(dst, src1, src2, nbits) *dst = *src1 & ~(*src2) |
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* bitmap_complement(dst, src, nbits) *dst = ~(*src) |
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* bitmap_equal(src1, src2, nbits) Are *src1 and *src2 equal? |
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* bitmap_intersects(src1, src2, nbits) Do *src1 and *src2 overlap? |
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* bitmap_subset(src1, src2, nbits) Is *src1 a subset of *src2? |
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* bitmap_empty(src, nbits) Are all bits zero in *src? |
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* bitmap_full(src, nbits) Are all bits set in *src? |
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* bitmap_weight(src, nbits) Hamming Weight: number set bits |
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* bitmap_set(dst, pos, nbits) Set specified bit area |
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* bitmap_clear(dst, pos, nbits) Clear specified bit area |
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* bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area |
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* bitmap_find_next_zero_area_off(buf, len, pos, n, mask, mask_off) as above |
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* bitmap_next_clear_region(map, &start, &end, nbits) Find next clear region |
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* bitmap_next_set_region(map, &start, &end, nbits) Find next set region |
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* bitmap_for_each_clear_region(map, rs, re, start, end) |
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* Iterate over all clear regions |
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* bitmap_for_each_set_region(map, rs, re, start, end) |
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* Iterate over all set regions |
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* bitmap_shift_right(dst, src, n, nbits) *dst = *src >> n |
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* bitmap_shift_left(dst, src, n, nbits) *dst = *src << n |
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* bitmap_cut(dst, src, first, n, nbits) Cut n bits from first, copy rest |
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* bitmap_replace(dst, old, new, mask, nbits) *dst = (*old & ~(*mask)) | (*new & *mask) |
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* bitmap_remap(dst, src, old, new, nbits) *dst = map(old, new)(src) |
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* bitmap_bitremap(oldbit, old, new, nbits) newbit = map(old, new)(oldbit) |
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* bitmap_onto(dst, orig, relmap, nbits) *dst = orig relative to relmap |
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* bitmap_fold(dst, orig, sz, nbits) dst bits = orig bits mod sz |
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* bitmap_parse(buf, buflen, dst, nbits) Parse bitmap dst from kernel buf |
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* bitmap_parse_user(ubuf, ulen, dst, nbits) Parse bitmap dst from user buf |
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* bitmap_parselist(buf, dst, nbits) Parse bitmap dst from kernel buf |
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* bitmap_parselist_user(buf, dst, nbits) Parse bitmap dst from user buf |
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* bitmap_find_free_region(bitmap, bits, order) Find and allocate bit region |
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* bitmap_release_region(bitmap, pos, order) Free specified bit region |
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* bitmap_allocate_region(bitmap, pos, order) Allocate specified bit region |
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* bitmap_from_arr32(dst, buf, nbits) Copy nbits from u32[] buf to dst |
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* bitmap_to_arr32(buf, src, nbits) Copy nbits from buf to u32[] dst |
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* bitmap_get_value8(map, start) Get 8bit value from map at start |
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* bitmap_set_value8(map, value, start) Set 8bit value to map at start |
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* |
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* Note, bitmap_zero() and bitmap_fill() operate over the region of |
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* unsigned longs, that is, bits behind bitmap till the unsigned long |
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* boundary will be zeroed or filled as well. Consider to use |
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* bitmap_clear() or bitmap_set() to make explicit zeroing or filling |
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* respectively. |
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*/ |
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/** |
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* DOC: bitmap bitops |
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* |
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* Also the following operations in asm/bitops.h apply to bitmaps.:: |
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* |
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* set_bit(bit, addr) *addr |= bit |
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* clear_bit(bit, addr) *addr &= ~bit |
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* change_bit(bit, addr) *addr ^= bit |
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* test_bit(bit, addr) Is bit set in *addr? |
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* test_and_set_bit(bit, addr) Set bit and return old value |
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* test_and_clear_bit(bit, addr) Clear bit and return old value |
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* test_and_change_bit(bit, addr) Change bit and return old value |
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* find_first_zero_bit(addr, nbits) Position first zero bit in *addr |
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* find_first_bit(addr, nbits) Position first set bit in *addr |
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* find_next_zero_bit(addr, nbits, bit) |
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* Position next zero bit in *addr >= bit |
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* find_next_bit(addr, nbits, bit) Position next set bit in *addr >= bit |
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* find_next_and_bit(addr1, addr2, nbits, bit) |
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* Same as find_next_bit, but in |
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* (*addr1 & *addr2) |
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* |
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*/ |
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/** |
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* DOC: declare bitmap |
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* The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used |
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* to declare an array named 'name' of just enough unsigned longs to |
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* contain all bit positions from 0 to 'bits' - 1. |
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*/ |
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/* |
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* Allocation and deallocation of bitmap. |
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* Provided in lib/bitmap.c to avoid circular dependency. |
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*/ |
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extern unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags); |
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extern unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags); |
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extern void bitmap_free(const unsigned long *bitmap); |
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/* |
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* lib/bitmap.c provides these functions: |
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*/ |
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extern int __bitmap_equal(const unsigned long *bitmap1, |
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const unsigned long *bitmap2, unsigned int nbits); |
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extern bool __pure __bitmap_or_equal(const unsigned long *src1, |
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const unsigned long *src2, |
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const unsigned long *src3, |
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unsigned int nbits); |
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extern void __bitmap_complement(unsigned long *dst, const unsigned long *src, |
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unsigned int nbits); |
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extern void __bitmap_shift_right(unsigned long *dst, const unsigned long *src, |
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unsigned int shift, unsigned int nbits); |
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extern void __bitmap_shift_left(unsigned long *dst, const unsigned long *src, |
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unsigned int shift, unsigned int nbits); |
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extern void bitmap_cut(unsigned long *dst, const unsigned long *src, |
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unsigned int first, unsigned int cut, |
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unsigned int nbits); |
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extern int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, |
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const unsigned long *bitmap2, unsigned int nbits); |
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extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, |
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const unsigned long *bitmap2, unsigned int nbits); |
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extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1, |
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const unsigned long *bitmap2, unsigned int nbits); |
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extern int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, |
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const unsigned long *bitmap2, unsigned int nbits); |
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extern void __bitmap_replace(unsigned long *dst, |
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const unsigned long *old, const unsigned long *new, |
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const unsigned long *mask, unsigned int nbits); |
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extern int __bitmap_intersects(const unsigned long *bitmap1, |
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const unsigned long *bitmap2, unsigned int nbits); |
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extern int __bitmap_subset(const unsigned long *bitmap1, |
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const unsigned long *bitmap2, unsigned int nbits); |
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extern int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits); |
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extern void __bitmap_set(unsigned long *map, unsigned int start, int len); |
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extern void __bitmap_clear(unsigned long *map, unsigned int start, int len); |
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extern unsigned long bitmap_find_next_zero_area_off(unsigned long *map, |
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unsigned long size, |
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unsigned long start, |
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unsigned int nr, |
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unsigned long align_mask, |
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unsigned long align_offset); |
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/** |
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* bitmap_find_next_zero_area - find a contiguous aligned zero area |
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* @map: The address to base the search on |
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* @size: The bitmap size in bits |
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* @start: The bitnumber to start searching at |
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* @nr: The number of zeroed bits we're looking for |
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* @align_mask: Alignment mask for zero area |
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* |
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* The @align_mask should be one less than a power of 2; the effect is that |
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* the bit offset of all zero areas this function finds is multiples of that |
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* power of 2. A @align_mask of 0 means no alignment is required. |
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*/ |
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static inline unsigned long |
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bitmap_find_next_zero_area(unsigned long *map, |
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unsigned long size, |
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unsigned long start, |
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unsigned int nr, |
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unsigned long align_mask) |
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{ |
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return bitmap_find_next_zero_area_off(map, size, start, nr, |
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align_mask, 0); |
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} |
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extern int bitmap_parse(const char *buf, unsigned int buflen, |
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unsigned long *dst, int nbits); |
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extern int bitmap_parse_user(const char __user *ubuf, unsigned int ulen, |
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unsigned long *dst, int nbits); |
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extern int bitmap_parselist(const char *buf, unsigned long *maskp, |
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int nmaskbits); |
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extern int bitmap_parselist_user(const char __user *ubuf, unsigned int ulen, |
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unsigned long *dst, int nbits); |
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extern void bitmap_remap(unsigned long *dst, const unsigned long *src, |
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const unsigned long *old, const unsigned long *new, unsigned int nbits); |
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extern int bitmap_bitremap(int oldbit, |
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const unsigned long *old, const unsigned long *new, int bits); |
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extern void bitmap_onto(unsigned long *dst, const unsigned long *orig, |
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const unsigned long *relmap, unsigned int bits); |
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extern void bitmap_fold(unsigned long *dst, const unsigned long *orig, |
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unsigned int sz, unsigned int nbits); |
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extern int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order); |
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extern void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order); |
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extern int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order); |
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#ifdef __BIG_ENDIAN |
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extern void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int nbits); |
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#else |
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#define bitmap_copy_le bitmap_copy |
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#endif |
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extern unsigned int bitmap_ord_to_pos(const unsigned long *bitmap, unsigned int ord, unsigned int nbits); |
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extern int bitmap_print_to_pagebuf(bool list, char *buf, |
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const unsigned long *maskp, int nmaskbits); |
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#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) |
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#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1))) |
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/* |
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* The static inlines below do not handle constant nbits==0 correctly, |
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* so make such users (should any ever turn up) call the out-of-line |
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* versions. |
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*/ |
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#define small_const_nbits(nbits) \ |
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(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG && (nbits) > 0) |
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static inline void bitmap_zero(unsigned long *dst, unsigned int nbits) |
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{ |
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unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); |
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memset(dst, 0, len); |
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} |
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static inline void bitmap_fill(unsigned long *dst, unsigned int nbits) |
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{ |
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unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); |
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memset(dst, 0xff, len); |
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} |
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static inline void bitmap_copy(unsigned long *dst, const unsigned long *src, |
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unsigned int nbits) |
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{ |
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unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); |
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memcpy(dst, src, len); |
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} |
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/* |
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* Copy bitmap and clear tail bits in last word. |
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*/ |
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static inline void bitmap_copy_clear_tail(unsigned long *dst, |
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const unsigned long *src, unsigned int nbits) |
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{ |
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bitmap_copy(dst, src, nbits); |
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if (nbits % BITS_PER_LONG) |
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dst[nbits / BITS_PER_LONG] &= BITMAP_LAST_WORD_MASK(nbits); |
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} |
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/* |
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* On 32-bit systems bitmaps are represented as u32 arrays internally, and |
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* therefore conversion is not needed when copying data from/to arrays of u32. |
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*/ |
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#if BITS_PER_LONG == 64 |
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extern void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf, |
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unsigned int nbits); |
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extern void bitmap_to_arr32(u32 *buf, const unsigned long *bitmap, |
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unsigned int nbits); |
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#else |
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#define bitmap_from_arr32(bitmap, buf, nbits) \ |
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bitmap_copy_clear_tail((unsigned long *) (bitmap), \ |
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(const unsigned long *) (buf), (nbits)) |
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#define bitmap_to_arr32(buf, bitmap, nbits) \ |
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bitmap_copy_clear_tail((unsigned long *) (buf), \ |
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(const unsigned long *) (bitmap), (nbits)) |
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#endif |
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static inline int bitmap_and(unsigned long *dst, const unsigned long *src1, |
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const unsigned long *src2, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0; |
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return __bitmap_and(dst, src1, src2, nbits); |
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} |
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static inline void bitmap_or(unsigned long *dst, const unsigned long *src1, |
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const unsigned long *src2, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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*dst = *src1 | *src2; |
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else |
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__bitmap_or(dst, src1, src2, nbits); |
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} |
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static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1, |
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const unsigned long *src2, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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*dst = *src1 ^ *src2; |
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else |
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__bitmap_xor(dst, src1, src2, nbits); |
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} |
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static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1, |
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const unsigned long *src2, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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return (*dst = *src1 & ~(*src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0; |
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return __bitmap_andnot(dst, src1, src2, nbits); |
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} |
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static inline void bitmap_complement(unsigned long *dst, const unsigned long *src, |
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unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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*dst = ~(*src); |
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else |
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__bitmap_complement(dst, src, nbits); |
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} |
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#ifdef __LITTLE_ENDIAN |
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#define BITMAP_MEM_ALIGNMENT 8 |
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#else |
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#define BITMAP_MEM_ALIGNMENT (8 * sizeof(unsigned long)) |
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#endif |
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#define BITMAP_MEM_MASK (BITMAP_MEM_ALIGNMENT - 1) |
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static inline int bitmap_equal(const unsigned long *src1, |
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const unsigned long *src2, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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return !((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits)); |
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if (__builtin_constant_p(nbits & BITMAP_MEM_MASK) && |
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IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT)) |
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return !memcmp(src1, src2, nbits / 8); |
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return __bitmap_equal(src1, src2, nbits); |
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} |
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/** |
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* bitmap_or_equal - Check whether the or of two bitmaps is equal to a third |
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* @src1: Pointer to bitmap 1 |
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* @src2: Pointer to bitmap 2 will be or'ed with bitmap 1 |
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* @src3: Pointer to bitmap 3. Compare to the result of *@src1 | *@src2 |
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* @nbits: number of bits in each of these bitmaps |
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* |
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* Returns: True if (*@src1 | *@src2) == *@src3, false otherwise |
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*/ |
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static inline bool bitmap_or_equal(const unsigned long *src1, |
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const unsigned long *src2, |
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const unsigned long *src3, |
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unsigned int nbits) |
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{ |
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if (!small_const_nbits(nbits)) |
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return __bitmap_or_equal(src1, src2, src3, nbits); |
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return !(((*src1 | *src2) ^ *src3) & BITMAP_LAST_WORD_MASK(nbits)); |
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} |
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static inline int bitmap_intersects(const unsigned long *src1, |
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const unsigned long *src2, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0; |
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else |
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return __bitmap_intersects(src1, src2, nbits); |
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} |
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static inline int bitmap_subset(const unsigned long *src1, |
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const unsigned long *src2, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits)); |
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else |
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return __bitmap_subset(src1, src2, nbits); |
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} |
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static inline bool bitmap_empty(const unsigned long *src, unsigned nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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return ! (*src & BITMAP_LAST_WORD_MASK(nbits)); |
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return find_first_bit(src, nbits) == nbits; |
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} |
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static inline bool bitmap_full(const unsigned long *src, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits)); |
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return find_first_zero_bit(src, nbits) == nbits; |
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} |
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static __always_inline int bitmap_weight(const unsigned long *src, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits)); |
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return __bitmap_weight(src, nbits); |
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} |
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static __always_inline void bitmap_set(unsigned long *map, unsigned int start, |
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unsigned int nbits) |
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{ |
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if (__builtin_constant_p(nbits) && nbits == 1) |
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__set_bit(start, map); |
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else if (__builtin_constant_p(start & BITMAP_MEM_MASK) && |
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IS_ALIGNED(start, BITMAP_MEM_ALIGNMENT) && |
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__builtin_constant_p(nbits & BITMAP_MEM_MASK) && |
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IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT)) |
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memset((char *)map + start / 8, 0xff, nbits / 8); |
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else |
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__bitmap_set(map, start, nbits); |
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} |
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static __always_inline void bitmap_clear(unsigned long *map, unsigned int start, |
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unsigned int nbits) |
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{ |
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if (__builtin_constant_p(nbits) && nbits == 1) |
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__clear_bit(start, map); |
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else if (__builtin_constant_p(start & BITMAP_MEM_MASK) && |
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IS_ALIGNED(start, BITMAP_MEM_ALIGNMENT) && |
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__builtin_constant_p(nbits & BITMAP_MEM_MASK) && |
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IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT)) |
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memset((char *)map + start / 8, 0, nbits / 8); |
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else |
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__bitmap_clear(map, start, nbits); |
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} |
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|
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static inline void bitmap_shift_right(unsigned long *dst, const unsigned long *src, |
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unsigned int shift, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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*dst = (*src & BITMAP_LAST_WORD_MASK(nbits)) >> shift; |
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else |
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__bitmap_shift_right(dst, src, shift, nbits); |
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} |
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|
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static inline void bitmap_shift_left(unsigned long *dst, const unsigned long *src, |
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unsigned int shift, unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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*dst = (*src << shift) & BITMAP_LAST_WORD_MASK(nbits); |
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else |
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__bitmap_shift_left(dst, src, shift, nbits); |
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} |
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static inline void bitmap_replace(unsigned long *dst, |
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const unsigned long *old, |
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const unsigned long *new, |
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const unsigned long *mask, |
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unsigned int nbits) |
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{ |
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if (small_const_nbits(nbits)) |
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*dst = (*old & ~(*mask)) | (*new & *mask); |
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else |
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__bitmap_replace(dst, old, new, mask, nbits); |
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} |
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|
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static inline void bitmap_next_clear_region(unsigned long *bitmap, |
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unsigned int *rs, unsigned int *re, |
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unsigned int end) |
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{ |
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*rs = find_next_zero_bit(bitmap, end, *rs); |
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*re = find_next_bit(bitmap, end, *rs + 1); |
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} |
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|
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static inline void bitmap_next_set_region(unsigned long *bitmap, |
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unsigned int *rs, unsigned int *re, |
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unsigned int end) |
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{ |
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*rs = find_next_bit(bitmap, end, *rs); |
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*re = find_next_zero_bit(bitmap, end, *rs + 1); |
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} |
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|
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/* |
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* Bitmap region iterators. Iterates over the bitmap between [@start, @end). |
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* @rs and @re should be integer variables and will be set to start and end |
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* index of the current clear or set region. |
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*/ |
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#define bitmap_for_each_clear_region(bitmap, rs, re, start, end) \ |
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for ((rs) = (start), \ |
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bitmap_next_clear_region((bitmap), &(rs), &(re), (end)); \ |
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(rs) < (re); \ |
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(rs) = (re) + 1, \ |
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bitmap_next_clear_region((bitmap), &(rs), &(re), (end))) |
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#define bitmap_for_each_set_region(bitmap, rs, re, start, end) \ |
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for ((rs) = (start), \ |
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bitmap_next_set_region((bitmap), &(rs), &(re), (end)); \ |
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(rs) < (re); \ |
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(rs) = (re) + 1, \ |
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bitmap_next_set_region((bitmap), &(rs), &(re), (end))) |
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/** |
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* BITMAP_FROM_U64() - Represent u64 value in the format suitable for bitmap. |
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* @n: u64 value |
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* |
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* Linux bitmaps are internally arrays of unsigned longs, i.e. 32-bit |
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* integers in 32-bit environment, and 64-bit integers in 64-bit one. |
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* |
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* There are four combinations of endianness and length of the word in linux |
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* ABIs: LE64, BE64, LE32 and BE32. |
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* |
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* On 64-bit kernels 64-bit LE and BE numbers are naturally ordered in |
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* bitmaps and therefore don't require any special handling. |
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* |
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* On 32-bit kernels 32-bit LE ABI orders lo word of 64-bit number in memory |
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* prior to hi, and 32-bit BE orders hi word prior to lo. The bitmap on the |
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* other hand is represented as an array of 32-bit words and the position of |
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* bit N may therefore be calculated as: word #(N/32) and bit #(N%32) in that |
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* word. For example, bit #42 is located at 10th position of 2nd word. |
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* It matches 32-bit LE ABI, and we can simply let the compiler store 64-bit |
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* values in memory as it usually does. But for BE we need to swap hi and lo |
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* words manually. |
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* |
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* With all that, the macro BITMAP_FROM_U64() does explicit reordering of hi and |
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* lo parts of u64. For LE32 it does nothing, and for BE environment it swaps |
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* hi and lo words, as is expected by bitmap. |
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*/ |
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#if __BITS_PER_LONG == 64 |
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#define BITMAP_FROM_U64(n) (n) |
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#else |
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#define BITMAP_FROM_U64(n) ((unsigned long) ((u64)(n) & ULONG_MAX)), \ |
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((unsigned long) ((u64)(n) >> 32)) |
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#endif |
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/** |
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* bitmap_from_u64 - Check and swap words within u64. |
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* @mask: source bitmap |
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* @dst: destination bitmap |
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* |
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* In 32-bit Big Endian kernel, when using ``(u32 *)(&val)[*]`` |
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* to read u64 mask, we will get the wrong word. |
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* That is ``(u32 *)(&val)[0]`` gets the upper 32 bits, |
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* but we expect the lower 32-bits of u64. |
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*/ |
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static inline void bitmap_from_u64(unsigned long *dst, u64 mask) |
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{ |
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dst[0] = mask & ULONG_MAX; |
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|
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if (sizeof(mask) > sizeof(unsigned long)) |
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dst[1] = mask >> 32; |
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} |
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/** |
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* bitmap_get_value8 - get an 8-bit value within a memory region |
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* @map: address to the bitmap memory region |
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* @start: bit offset of the 8-bit value; must be a multiple of 8 |
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* |
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* Returns the 8-bit value located at the @start bit offset within the @src |
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* memory region. |
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*/ |
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static inline unsigned long bitmap_get_value8(const unsigned long *map, |
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unsigned long start) |
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{ |
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const size_t index = BIT_WORD(start); |
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const unsigned long offset = start % BITS_PER_LONG; |
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return (map[index] >> offset) & 0xFF; |
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} |
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/** |
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* bitmap_set_value8 - set an 8-bit value within a memory region |
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* @map: address to the bitmap memory region |
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* @value: the 8-bit value; values wider than 8 bits may clobber bitmap |
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* @start: bit offset of the 8-bit value; must be a multiple of 8 |
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*/ |
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static inline void bitmap_set_value8(unsigned long *map, unsigned long value, |
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unsigned long start) |
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{ |
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const size_t index = BIT_WORD(start); |
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const unsigned long offset = start % BITS_PER_LONG; |
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|
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map[index] &= ~(0xFFUL << offset); |
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map[index] |= value << offset; |
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} |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __LINUX_BITMAP_H */
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