208 lines
5.8 KiB
C
208 lines
5.8 KiB
C
/*
|
|
* Copyright 1995, Russell King.
|
|
*
|
|
* Based on the arm32 version by RMK (and others). Their copyrights apply to
|
|
* Those parts.
|
|
* Modified for arm26 by Ian Molton on 25/11/04
|
|
*
|
|
* bit 0 is the LSB of an "unsigned long" quantity.
|
|
*
|
|
* Please note that the code in this file should never be included
|
|
* from user space. Many of these are not implemented in assembler
|
|
* since they would be too costly. Also, they require privileged
|
|
* instructions (which are not available from user mode) to ensure
|
|
* that they are atomic.
|
|
*/
|
|
|
|
#ifndef __ASM_ARM_BITOPS_H
|
|
#define __ASM_ARM_BITOPS_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/system.h>
|
|
|
|
#define smp_mb__before_clear_bit() do { } while (0)
|
|
#define smp_mb__after_clear_bit() do { } while (0)
|
|
|
|
/*
|
|
* These functions are the basis of our bit ops.
|
|
*
|
|
* First, the atomic bitops. These use native endian.
|
|
*/
|
|
static inline void ____atomic_set_bit(unsigned int bit, volatile unsigned long *p)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long mask = 1UL << (bit & 31);
|
|
|
|
p += bit >> 5;
|
|
|
|
local_irq_save(flags);
|
|
*p |= mask;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static inline void ____atomic_clear_bit(unsigned int bit, volatile unsigned long *p)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long mask = 1UL << (bit & 31);
|
|
|
|
p += bit >> 5;
|
|
|
|
local_irq_save(flags);
|
|
*p &= ~mask;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static inline void ____atomic_change_bit(unsigned int bit, volatile unsigned long *p)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long mask = 1UL << (bit & 31);
|
|
|
|
p += bit >> 5;
|
|
|
|
local_irq_save(flags);
|
|
*p ^= mask;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static inline int
|
|
____atomic_test_and_set_bit(unsigned int bit, volatile unsigned long *p)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int res;
|
|
unsigned long mask = 1UL << (bit & 31);
|
|
|
|
p += bit >> 5;
|
|
|
|
local_irq_save(flags);
|
|
res = *p;
|
|
*p = res | mask;
|
|
local_irq_restore(flags);
|
|
|
|
return res & mask;
|
|
}
|
|
|
|
static inline int
|
|
____atomic_test_and_clear_bit(unsigned int bit, volatile unsigned long *p)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int res;
|
|
unsigned long mask = 1UL << (bit & 31);
|
|
|
|
p += bit >> 5;
|
|
|
|
local_irq_save(flags);
|
|
res = *p;
|
|
*p = res & ~mask;
|
|
local_irq_restore(flags);
|
|
|
|
return res & mask;
|
|
}
|
|
|
|
static inline int
|
|
____atomic_test_and_change_bit(unsigned int bit, volatile unsigned long *p)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int res;
|
|
unsigned long mask = 1UL << (bit & 31);
|
|
|
|
p += bit >> 5;
|
|
|
|
local_irq_save(flags);
|
|
res = *p;
|
|
*p = res ^ mask;
|
|
local_irq_restore(flags);
|
|
|
|
return res & mask;
|
|
}
|
|
|
|
#include <asm-generic/bitops/non-atomic.h>
|
|
|
|
/*
|
|
* Little endian assembly bitops. nr = 0 -> byte 0 bit 0.
|
|
*/
|
|
extern void _set_bit_le(int nr, volatile unsigned long * p);
|
|
extern void _clear_bit_le(int nr, volatile unsigned long * p);
|
|
extern void _change_bit_le(int nr, volatile unsigned long * p);
|
|
extern int _test_and_set_bit_le(int nr, volatile unsigned long * p);
|
|
extern int _test_and_clear_bit_le(int nr, volatile unsigned long * p);
|
|
extern int _test_and_change_bit_le(int nr, volatile unsigned long * p);
|
|
extern int _find_first_zero_bit_le(const unsigned long * p, unsigned size);
|
|
extern int _find_next_zero_bit_le(void * p, int size, int offset);
|
|
extern int _find_first_bit_le(const unsigned long *p, unsigned size);
|
|
extern int _find_next_bit_le(const unsigned long *p, int size, int offset);
|
|
|
|
/*
|
|
* The __* form of bitops are non-atomic and may be reordered.
|
|
*/
|
|
#define ATOMIC_BITOP_LE(name,nr,p) \
|
|
(__builtin_constant_p(nr) ? \
|
|
____atomic_##name(nr, p) : \
|
|
_##name##_le(nr,p))
|
|
|
|
#define NONATOMIC_BITOP(name,nr,p) \
|
|
(____nonatomic_##name(nr, p))
|
|
|
|
/*
|
|
* These are the little endian, atomic definitions.
|
|
*/
|
|
#define set_bit(nr,p) ATOMIC_BITOP_LE(set_bit,nr,p)
|
|
#define clear_bit(nr,p) ATOMIC_BITOP_LE(clear_bit,nr,p)
|
|
#define change_bit(nr,p) ATOMIC_BITOP_LE(change_bit,nr,p)
|
|
#define test_and_set_bit(nr,p) ATOMIC_BITOP_LE(test_and_set_bit,nr,p)
|
|
#define test_and_clear_bit(nr,p) ATOMIC_BITOP_LE(test_and_clear_bit,nr,p)
|
|
#define test_and_change_bit(nr,p) ATOMIC_BITOP_LE(test_and_change_bit,nr,p)
|
|
#define find_first_zero_bit(p,sz) _find_first_zero_bit_le(p,sz)
|
|
#define find_next_zero_bit(p,sz,off) _find_next_zero_bit_le(p,sz,off)
|
|
#define find_first_bit(p,sz) _find_first_bit_le(p,sz)
|
|
#define find_next_bit(p,sz,off) _find_next_bit_le(p,sz,off)
|
|
|
|
#define WORD_BITOFF_TO_LE(x) ((x))
|
|
|
|
#include <asm-generic/bitops/ffz.h>
|
|
#include <asm-generic/bitops/__ffs.h>
|
|
#include <asm-generic/bitops/fls.h>
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/ffs.h>
|
|
#include <asm-generic/bitops/sched.h>
|
|
#include <asm-generic/bitops/hweight.h>
|
|
|
|
/*
|
|
* Ext2 is defined to use little-endian byte ordering.
|
|
* These do not need to be atomic.
|
|
*/
|
|
#define ext2_set_bit(nr,p) \
|
|
__test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define ext2_set_bit_atomic(lock,nr,p) \
|
|
test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define ext2_clear_bit(nr,p) \
|
|
__test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define ext2_clear_bit_atomic(lock,nr,p) \
|
|
test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define ext2_test_bit(nr,p) \
|
|
test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define ext2_find_first_zero_bit(p,sz) \
|
|
_find_first_zero_bit_le(p,sz)
|
|
#define ext2_find_next_zero_bit(p,sz,off) \
|
|
_find_next_zero_bit_le(p,sz,off)
|
|
|
|
/*
|
|
* Minix is defined to use little-endian byte ordering.
|
|
* These do not need to be atomic.
|
|
*/
|
|
#define minix_set_bit(nr,p) \
|
|
__set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define minix_test_bit(nr,p) \
|
|
test_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define minix_test_and_set_bit(nr,p) \
|
|
__test_and_set_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define minix_test_and_clear_bit(nr,p) \
|
|
__test_and_clear_bit(WORD_BITOFF_TO_LE(nr), (unsigned long *)(p))
|
|
#define minix_find_first_zero_bit(p,sz) \
|
|
_find_first_zero_bit_le((unsigned long *)(p),sz)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ARM_BITOPS_H */
|