From c93e305af72a344c66f467899b6277b4d3d94db9 Mon Sep 17 00:00:00 2001 From: Vignesh Raghavendra Date: Tue, 1 Oct 2019 17:26:30 +0530 Subject: [PATCH] bitmaps: import for_each_set_bit() macro Import for_each_set_bit() and associated macros and functions from Linux. This is useful in parsing interrupt registers and take action on each bit that is set. Signed-off-by: Vignesh Raghavendra --- include/linux/bitmap.h | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 4a54ae0..fbbb67c 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -20,4 +20,65 @@ static inline void bitmap_zero(unsigned long *dst, int nbits) } } +static inline unsigned long +find_next_bit(const unsigned long *addr, unsigned long size, + unsigned long offset) +{ + const unsigned long *p = addr + BIT_WORD(offset); + unsigned long result = offset & ~(BITS_PER_LONG - 1); + unsigned long tmp; + + if (offset >= size) + return size; + size -= result; + offset %= BITS_PER_LONG; + if (offset) { + tmp = *(p++); + tmp &= (~0UL << offset); + if (size < BITS_PER_LONG) + goto found_first; + if (tmp) + goto found_middle; + size -= BITS_PER_LONG; + result += BITS_PER_LONG; + } + while (size & ~(BITS_PER_LONG - 1)) { + tmp = *(p++); + if ((tmp)) + goto found_middle; + result += BITS_PER_LONG; + size -= BITS_PER_LONG; + } + if (!size) + return result; + tmp = *p; + +found_first: + tmp &= (~0UL >> (BITS_PER_LONG - size)); + if (tmp == 0UL) /* Are any bits set? */ + return result + size; /* Nope. */ +found_middle: + return result + __ffs(tmp); +} + +/* + * Find the first set bit in a memory region. + */ +static inline unsigned long find_first_bit(const unsigned long *addr, unsigned long size) +{ + unsigned long idx; + + for (idx = 0; idx * BITS_PER_LONG < size; idx++) { + if (addr[idx]) + return min(idx * BITS_PER_LONG + __ffs(addr[idx]), size); + } + + return size; +} + +#define for_each_set_bit(bit, addr, size) \ + for ((bit) = find_first_bit((addr), (size)); \ + (bit) < (size); \ + (bit) = find_next_bit((addr), (size), (bit) + 1)) + #endif /* __LINUX_BITMAP_H */ -- 2.7.4