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8a92603a34
Add find_next_zero_area to fetch the next zero area in the map. Signed-off-by: Keerthy <j-keerthy@ti.com> Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com>
243 lines
5.8 KiB
C
243 lines
5.8 KiB
C
// 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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#include <asm/types.h>
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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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#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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#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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#define small_const_nbits(nbits) \
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(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
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static inline void
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__bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits)
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{
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unsigned int k;
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unsigned int nr = BITS_TO_LONGS(bits);
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for (k = 0; k < nr; k++)
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dst[k] = bitmap1[k] | bitmap2[k];
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}
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static inline int
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__bitmap_weight(const unsigned long *bitmap, unsigned int bits)
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{
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unsigned int k, lim = bits / BITS_PER_LONG;
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int w = 0;
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for (k = 0; k < lim; k++)
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w += hweight_long(bitmap[k]);
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if (bits % BITS_PER_LONG)
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w += hweight_long(bitmap[k] & BITMAP_LAST_WORD_MASK(bits));
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return w;
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}
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static inline void
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__bitmap_set(unsigned long *map, unsigned int start, int len)
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{
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unsigned long *p = map + BIT_WORD(start);
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const unsigned int size = start + len;
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int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG);
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unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start);
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while (len - bits_to_set >= 0) {
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*p |= mask_to_set;
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len -= bits_to_set;
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bits_to_set = BITS_PER_LONG;
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mask_to_set = ~0UL;
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p++;
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}
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if (len) {
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mask_to_set &= BITMAP_LAST_WORD_MASK(size);
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*p |= mask_to_set;
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}
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}
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static inline void
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__bitmap_clear(unsigned long *map, unsigned int start, int len)
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{
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unsigned long *p = map + BIT_WORD(start);
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const unsigned int size = start + len;
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int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
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unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
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while (len - bits_to_clear >= 0) {
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*p &= ~mask_to_clear;
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len -= bits_to_clear;
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bits_to_clear = BITS_PER_LONG;
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mask_to_clear = ~0UL;
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p++;
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}
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if (len) {
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mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
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*p &= ~mask_to_clear;
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}
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}
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static inline void bitmap_zero(unsigned long *dst, int nbits)
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{
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if (small_const_nbits(nbits)) {
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*dst = 0UL;
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} else {
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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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}
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static inline unsigned long
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find_next_bit(const unsigned long *addr, unsigned long size,
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unsigned long offset)
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{
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const unsigned long *p = addr + BIT_WORD(offset);
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unsigned long result = offset & ~(BITS_PER_LONG - 1);
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unsigned long tmp;
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if (offset >= size)
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return size;
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size -= result;
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offset %= BITS_PER_LONG;
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if (offset) {
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tmp = *(p++);
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tmp &= (~0UL << offset);
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if (size < BITS_PER_LONG)
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goto found_first;
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if (tmp)
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goto found_middle;
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size -= BITS_PER_LONG;
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result += BITS_PER_LONG;
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}
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while (size & ~(BITS_PER_LONG - 1)) {
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tmp = *(p++);
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if ((tmp))
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goto found_middle;
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result += BITS_PER_LONG;
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size -= BITS_PER_LONG;
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}
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if (!size)
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return result;
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tmp = *p;
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found_first:
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tmp &= (~0UL >> (BITS_PER_LONG - size));
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if (tmp == 0UL) /* Are any bits set? */
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return result + size; /* Nope. */
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found_middle:
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return result + __ffs(tmp);
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}
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/*
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* Find the first set bit in a memory region.
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*/
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static inline unsigned long find_first_bit(const unsigned long *addr, unsigned long size)
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{
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unsigned long idx;
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for (idx = 0; idx * BITS_PER_LONG < size; idx++) {
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if (addr[idx])
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return min(idx * BITS_PER_LONG + __ffs(addr[idx]), size);
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}
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return size;
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}
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#define for_each_set_bit(bit, addr, size) \
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for ((bit) = find_first_bit((addr), (size)); \
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(bit) < (size); \
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(bit) = find_next_bit((addr), (size), (bit) + 1))
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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, unsigned long align_mask)
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{
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unsigned long index, end, i;
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again:
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index = find_next_zero_bit(map, size, start);
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/*
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* Align allocation
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*/
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index = (index + align_mask) & ~align_mask;
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end = index + nr;
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if (end > size)
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return end;
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i = find_next_bit(map, end, index);
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if (i < end) {
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start = i + 1;
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goto again;
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}
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return index;
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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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if (small_const_nbits(nbits)) {
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*dst = ~0UL;
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} else {
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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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}
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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 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 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 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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#endif /* __LINUX_BITMAP_H */
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