mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Paul Gortmaker](/assets/img/avatar_default.png)
For files only using THIS_MODULE and/or EXPORT_SYMBOL, map them onto including export.h -- or if the file isn't even using those, then just delete the include. Fix up any implicit include dependencies that were being masked by module.h along the way. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
285 lines
6.4 KiB
C
285 lines
6.4 KiB
C
/* find_next_bit.c: fallback find next bit implementation
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/export.h>
|
|
#include <asm/types.h>
|
|
#include <asm/byteorder.h>
|
|
|
|
#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
|
|
|
|
#ifndef find_next_bit
|
|
/*
|
|
* Find the next set bit in a memory region.
|
|
*/
|
|
unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
|
|
unsigned long offset)
|
|
{
|
|
const unsigned long *p = addr + BITOP_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)) {
|
|
if ((tmp = *(p++)))
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL(find_next_bit);
|
|
#endif
|
|
|
|
#ifndef find_next_zero_bit
|
|
/*
|
|
* This implementation of find_{first,next}_zero_bit was stolen from
|
|
* Linus' asm-alpha/bitops.h.
|
|
*/
|
|
unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
|
|
unsigned long offset)
|
|
{
|
|
const unsigned long *p = addr + BITOP_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 >> (BITS_PER_LONG - 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)) {
|
|
if (~(tmp = *(p++)))
|
|
goto found_middle;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
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);
|
|
#endif
|
|
|
|
#ifndef find_first_bit
|
|
/*
|
|
* Find the first set bit in a memory region.
|
|
*/
|
|
unsigned long find_first_bit(const unsigned long *addr, unsigned long size)
|
|
{
|
|
const unsigned long *p = addr;
|
|
unsigned long result = 0;
|
|
unsigned long tmp;
|
|
|
|
while (size & ~(BITS_PER_LONG-1)) {
|
|
if ((tmp = *(p++)))
|
|
goto found;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
|
|
tmp = (*p) & (~0UL >> (BITS_PER_LONG - size));
|
|
if (tmp == 0UL) /* Are any bits set? */
|
|
return result + size; /* Nope. */
|
|
found:
|
|
return result + __ffs(tmp);
|
|
}
|
|
EXPORT_SYMBOL(find_first_bit);
|
|
#endif
|
|
|
|
#ifndef find_first_zero_bit
|
|
/*
|
|
* Find the first cleared bit in a memory region.
|
|
*/
|
|
unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size)
|
|
{
|
|
const unsigned long *p = addr;
|
|
unsigned long result = 0;
|
|
unsigned long tmp;
|
|
|
|
while (size & ~(BITS_PER_LONG-1)) {
|
|
if (~(tmp = *(p++)))
|
|
goto found;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
|
|
tmp = (*p) | (~0UL << size);
|
|
if (tmp == ~0UL) /* Are any bits zero? */
|
|
return result + size; /* Nope. */
|
|
found:
|
|
return result + ffz(tmp);
|
|
}
|
|
EXPORT_SYMBOL(find_first_zero_bit);
|
|
#endif
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
|
|
/* include/linux/byteorder does not support "unsigned long" type */
|
|
static inline unsigned long ext2_swabp(const unsigned long * x)
|
|
{
|
|
#if BITS_PER_LONG == 64
|
|
return (unsigned long) __swab64p((u64 *) x);
|
|
#elif BITS_PER_LONG == 32
|
|
return (unsigned long) __swab32p((u32 *) x);
|
|
#else
|
|
#error BITS_PER_LONG not defined
|
|
#endif
|
|
}
|
|
|
|
/* include/linux/byteorder doesn't support "unsigned long" type */
|
|
static inline unsigned long ext2_swab(const unsigned long y)
|
|
{
|
|
#if BITS_PER_LONG == 64
|
|
return (unsigned long) __swab64((u64) y);
|
|
#elif BITS_PER_LONG == 32
|
|
return (unsigned long) __swab32((u32) y);
|
|
#else
|
|
#error BITS_PER_LONG not defined
|
|
#endif
|
|
}
|
|
|
|
#ifndef find_next_zero_bit_le
|
|
unsigned long find_next_zero_bit_le(const void *addr, unsigned
|
|
long size, unsigned long offset)
|
|
{
|
|
const unsigned long *p = addr;
|
|
unsigned long result = offset & ~(BITS_PER_LONG - 1);
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
p += BITOP_WORD(offset);
|
|
size -= result;
|
|
offset &= (BITS_PER_LONG - 1UL);
|
|
if (offset) {
|
|
tmp = ext2_swabp(p++);
|
|
tmp |= (~0UL >> (BITS_PER_LONG - 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)) {
|
|
if (~(tmp = *(p++)))
|
|
goto found_middle_swap;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = ext2_swabp(p);
|
|
found_first:
|
|
tmp |= ~0UL << size;
|
|
if (tmp == ~0UL) /* Are any bits zero? */
|
|
return result + size; /* Nope. Skip ffz */
|
|
found_middle:
|
|
return result + ffz(tmp);
|
|
|
|
found_middle_swap:
|
|
return result + ffz(ext2_swab(tmp));
|
|
}
|
|
EXPORT_SYMBOL(find_next_zero_bit_le);
|
|
#endif
|
|
|
|
#ifndef find_next_bit_le
|
|
unsigned long find_next_bit_le(const void *addr, unsigned
|
|
long size, unsigned long offset)
|
|
{
|
|
const unsigned long *p = addr;
|
|
unsigned long result = offset & ~(BITS_PER_LONG - 1);
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
p += BITOP_WORD(offset);
|
|
size -= result;
|
|
offset &= (BITS_PER_LONG - 1UL);
|
|
if (offset) {
|
|
tmp = ext2_swabp(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_swap;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = ext2_swabp(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);
|
|
|
|
found_middle_swap:
|
|
return result + __ffs(ext2_swab(tmp));
|
|
}
|
|
EXPORT_SYMBOL(find_next_bit_le);
|
|
#endif
|
|
|
|
#endif /* __BIG_ENDIAN */
|