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arm: Make arm bitops endianness-independent 

Bring over the bitop implementations from the Linux
include/asm-generic/bitops/non-atomic.h to provide
endianness-independence.

Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
This commit is contained in:
Simon Kagstrom 2009-08-24 09:10:03 +02:00 committed by Wolfgang Denk
parent 02f99901ed
commit 4b15de08fe
1 changed files with 19 additions and 28 deletions
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47
include/asm-arm/bitops.h
View File

@ -25,61 +25,52 @@
*/
extern void set_bit(int nr, volatile void * addr);
static inline void __set_bit(int nr, volatile void *addr)
{
((unsigned char *) addr)[nr >> 3] |= (1U << (nr & 7));
}
#define __set_bit
extern void clear_bit(int nr, volatile void * addr);
static inline void __clear_bit(int nr, volatile void *addr)
{
((unsigned char *) addr)[nr >> 3] &= ~(1U << (nr & 7));
}
#define __clear_bit
extern void change_bit(int nr, volatile void * addr);
static inline void __change_bit(int nr, volatile void *addr)
{
((unsigned char *) addr)[nr >> 3] ^= (1U << (nr & 7));
unsigned long mask = BIT_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
*p ^= mask;
}
extern int test_and_set_bit(int nr, volatile void * addr);
static inline int __test_and_set_bit(int nr, volatile void *addr)
{
unsigned int mask = 1 << (nr & 7);
unsigned int oldval;
unsigned long mask = BIT_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
unsigned long old = *p;
oldval = ((unsigned char *) addr)[nr >> 3];
((unsigned char *) addr)[nr >> 3] = oldval | mask;
return oldval & mask;
*p = old | mask;
return (old & mask) != 0;
}
extern int test_and_clear_bit(int nr, volatile void * addr);
static inline int __test_and_clear_bit(int nr, volatile void *addr)
{
unsigned int mask = 1 << (nr & 7);
unsigned int oldval;
unsigned long mask = BIT_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
unsigned long old = *p;
oldval = ((unsigned char *) addr)[nr >> 3];
((unsigned char *) addr)[nr >> 3] = oldval & ~mask;
return oldval & mask;
*p = old & ~mask;
return (old & mask) != 0;
}
extern int test_and_change_bit(int nr, volatile void * addr);
static inline int __test_and_change_bit(int nr, volatile void *addr)
{
unsigned int mask = 1 << (nr & 7);
unsigned int oldval;
unsigned long mask = BIT_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
unsigned long old = *p;
oldval = ((unsigned char *) addr)[nr >> 3];
((unsigned char *) addr)[nr >> 3] = oldval ^ mask;
return oldval & mask;
*p = old ^ mask;
return (old & mask) != 0;
}
extern int find_first_zero_bit(void * addr, unsigned size);