LXR linux/arch/arm64/include/asm/bitops.h

   1/*
   2 * Copyright (C) 2012 ARM Ltd.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16#ifndef __ASM_BITOPS_H
  17#define __ASM_BITOPS_H
  18
  19#include <linux/compiler.h>
  20
  21#include <asm/barrier.h>
  22
  23/*
  24 * clear_bit may not imply a memory barrier
  25 */
  26#ifndef smp_mb__before_clear_bit
  27#define smp_mb__before_clear_bit()      smp_mb()
  28#define smp_mb__after_clear_bit()       smp_mb()
  29#endif
  30
  31#ifndef _LINUX_BITOPS_H
  32#error only <linux/bitops.h> can be included directly
  33#endif
  34
  35/*
  36 * Little endian assembly atomic bitops.
  37 */
  38extern void set_bit(int nr, volatile unsigned long *p);
  39extern void clear_bit(int nr, volatile unsigned long *p);
  40extern void change_bit(int nr, volatile unsigned long *p);
  41extern int test_and_set_bit(int nr, volatile unsigned long *p);
  42extern int test_and_clear_bit(int nr, volatile unsigned long *p);
  43extern int test_and_change_bit(int nr, volatile unsigned long *p);
  44
  45#include <asm-generic/bitops/builtin-__ffs.h>
  46#include <asm-generic/bitops/builtin-ffs.h>
  47#include <asm-generic/bitops/builtin-__fls.h>
  48#include <asm-generic/bitops/builtin-fls.h>
  49
  50#include <asm-generic/bitops/ffz.h>
  51#include <asm-generic/bitops/fls64.h>
  52#include <asm-generic/bitops/find.h>
  53
  54#include <asm-generic/bitops/sched.h>
  55#include <asm-generic/bitops/hweight.h>
  56#include <asm-generic/bitops/lock.h>
  57
  58#include <asm-generic/bitops/non-atomic.h>
  59#include <asm-generic/bitops/le.h>
  60
  61/*
  62 * Ext2 is defined to use little-endian byte ordering.
  63 */
  64#define ext2_set_bit_atomic(lock, nr, p)        test_and_set_bit_le(nr, p)
  65#define ext2_clear_bit_atomic(lock, nr, p)      test_and_clear_bit_le(nr, p)
  66
  67#endif /* __ASM_BITOPS_H */
  68