1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
147 lines
2.8 KiB
C
147 lines
2.8 KiB
C
/*
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* These are too big to be inlined.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <asm/byteorder.h>
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unsigned long find_next_zero_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 + (offset >> 6);
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unsigned long result = offset & ~63UL;
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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 &= 63UL;
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if (offset) {
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tmp = *(p++);
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tmp |= ~0UL >> (64 - offset);
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if (size < 64)
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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 -= 64;
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result += 64;
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}
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while (size & ~63UL) {
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if (~(tmp = *(p++)))
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goto found_middle;
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result += 64;
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size -= 64;
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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 << size;
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if (tmp == ~0UL) /* Are any bits zero? */
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return result + size; /* Nope. */
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found_middle:
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return result + ffz(tmp);
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}
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EXPORT_SYMBOL(find_next_zero_bit);
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unsigned long 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 + (offset >> 6);
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unsigned long result = offset & ~63UL;
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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 &= 63UL;
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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 < 64)
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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 -= 64;
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result += 64;
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}
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while (size & ~63UL) {
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if ((tmp = *(p++)))
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goto found_middle;
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result += 64;
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size -= 64;
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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 >> (64 - 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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EXPORT_SYMBOL(find_next_bit);
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static inline unsigned int ext2_ilog2(unsigned int x)
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{
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int lz;
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asm("cntlzw %0,%1": "=r"(lz):"r"(x));
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return 31 - lz;
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}
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static inline unsigned int ext2_ffz(unsigned int x)
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{
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u32 rc;
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if ((x = ~x) == 0)
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return 32;
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rc = ext2_ilog2(x & -x);
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return rc;
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}
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unsigned long find_next_zero_le_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 int *p = ((const unsigned int *)addr) + (offset >> 5);
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unsigned int result = offset & ~31;
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unsigned int 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 &= 31;
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if (offset) {
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tmp = cpu_to_le32p(p++);
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tmp |= ~0U >> (32 - offset); /* bug or feature ? */
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if (size < 32)
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goto found_first;
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if (tmp != ~0)
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goto found_middle;
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size -= 32;
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result += 32;
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}
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while (size >= 32) {
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if ((tmp = cpu_to_le32p(p++)) != ~0)
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goto found_middle;
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result += 32;
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size -= 32;
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}
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if (!size)
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return result;
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tmp = cpu_to_le32p(p);
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found_first:
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tmp |= ~0 << size;
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if (tmp == ~0) /* Are any bits zero? */
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return result + size; /* Nope. */
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found_middle:
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return result + ext2_ffz(tmp);
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}
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EXPORT_SYMBOL(find_next_zero_le_bit);
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