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!
148 lines
2.8 KiB
C
148 lines
2.8 KiB
C
/*
|
|
* These are too big to be inlined.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/bitops.h>
|
|
#include <asm/byteorder.h>
|
|
|
|
unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
|
|
unsigned long offset)
|
|
{
|
|
const unsigned long *p = addr + (offset >> 6);
|
|
unsigned long result = offset & ~63UL;
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 63UL;
|
|
if (offset) {
|
|
tmp = *(p++);
|
|
tmp |= ~0UL >> (64 - offset);
|
|
if (size < 64)
|
|
goto found_first;
|
|
if (~tmp)
|
|
goto found_middle;
|
|
size -= 64;
|
|
result += 64;
|
|
}
|
|
while (size & ~63UL) {
|
|
if (~(tmp = *(p++)))
|
|
goto found_middle;
|
|
result += 64;
|
|
size -= 64;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = *p;
|
|
|
|
found_first:
|
|
tmp |= ~0UL << size;
|
|
if (tmp == ~0UL) /* Are any bits zero? */
|
|
return result + size; /* Nope. */
|
|
found_middle:
|
|
return result + ffz(tmp);
|
|
}
|
|
|
|
EXPORT_SYMBOL(find_next_zero_bit);
|
|
|
|
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
|
|
unsigned long offset)
|
|
{
|
|
const unsigned long *p = addr + (offset >> 6);
|
|
unsigned long result = offset & ~63UL;
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 63UL;
|
|
if (offset) {
|
|
tmp = *(p++);
|
|
tmp &= (~0UL << offset);
|
|
if (size < 64)
|
|
goto found_first;
|
|
if (tmp)
|
|
goto found_middle;
|
|
size -= 64;
|
|
result += 64;
|
|
}
|
|
while (size & ~63UL) {
|
|
if ((tmp = *(p++)))
|
|
goto found_middle;
|
|
result += 64;
|
|
size -= 64;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = *p;
|
|
|
|
found_first:
|
|
tmp &= (~0UL >> (64 - size));
|
|
if (tmp == 0UL) /* Are any bits set? */
|
|
return result + size; /* Nope. */
|
|
found_middle:
|
|
return result + __ffs(tmp);
|
|
}
|
|
|
|
EXPORT_SYMBOL(find_next_bit);
|
|
|
|
static inline unsigned int ext2_ilog2(unsigned int x)
|
|
{
|
|
int lz;
|
|
|
|
asm("cntlzw %0,%1": "=r"(lz):"r"(x));
|
|
return 31 - lz;
|
|
}
|
|
|
|
static inline unsigned int ext2_ffz(unsigned int x)
|
|
{
|
|
u32 rc;
|
|
if ((x = ~x) == 0)
|
|
return 32;
|
|
rc = ext2_ilog2(x & -x);
|
|
return rc;
|
|
}
|
|
|
|
unsigned long find_next_zero_le_bit(const unsigned long *addr, unsigned long size,
|
|
unsigned long offset)
|
|
{
|
|
const unsigned int *p = ((const unsigned int *)addr) + (offset >> 5);
|
|
unsigned int result = offset & ~31;
|
|
unsigned int tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 31;
|
|
if (offset) {
|
|
tmp = cpu_to_le32p(p++);
|
|
tmp |= ~0U >> (32 - offset); /* bug or feature ? */
|
|
if (size < 32)
|
|
goto found_first;
|
|
if (tmp != ~0)
|
|
goto found_middle;
|
|
size -= 32;
|
|
result += 32;
|
|
}
|
|
while (size >= 32) {
|
|
if ((tmp = cpu_to_le32p(p++)) != ~0)
|
|
goto found_middle;
|
|
result += 32;
|
|
size -= 32;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = cpu_to_le32p(p);
|
|
found_first:
|
|
tmp |= ~0 << size;
|
|
if (tmp == ~0) /* Are any bits zero? */
|
|
return result + size; /* Nope. */
|
|
found_middle:
|
|
return result + ext2_ffz(tmp);
|
|
}
|
|
|
|
EXPORT_SYMBOL(find_next_zero_le_bit);
|