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authorSimon Kagstrom <simon.kagstrom@netinsight.net>2009-08-24 09:10:03 +0200
committerWolfgang Denk <wd@denx.de>2009-09-15 22:34:04 +0200
commit4b15de08fe4d2c9d12a3764394731018a763216b (patch)
tree78c36ef7b48f231f79bf0705ca986d2e203f2d64 /include
parent02f99901ed1c9d828e3ea117f94ce2264bf8389e (diff)
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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>
Diffstat (limited to 'include')
-rw-r--r--include/asm-arm/bitops.h47
1 files changed, 19 insertions, 28 deletions
diff --git a/include/asm-arm/bitops.h b/include/asm-arm/bitops.h
index 1549da1..854e225 100644
--- a/include/asm-arm/bitops.h
+++ b/include/asm-arm/bitops.h
@@ -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);