sh: GUSA atomic rollback support.
This implements kernel-level atomic rollback built on top of gUSA,
as an alternative non-IRQ based atomicity method. This is generally
a faster method for platforms that are lacking the LL/SC pairs that
SH-4A and later use, and is only supportable on legacy cores.
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/bitops.h b/include/asm-sh/bitops.h
index a7bd81a..b6ba5a6 100644
--- a/include/asm-sh/bitops.h
+++ b/include/asm-sh/bitops.h
@@ -11,97 +11,18 @@
/* For __swab32 */
#include <asm/byteorder.h>
-static inline void set_bit(int nr, volatile void * addr)
-{
- int mask;
- volatile unsigned int *a = addr;
- unsigned long flags;
+#ifdef CONFIG_GUSA_RB
+#include <asm/bitops-grb.h>
+#else
+#include <asm/bitops-irq.h>
+#endif
- a += nr >> 5;
- mask = 1 << (nr & 0x1f);
- local_irq_save(flags);
- *a |= mask;
- local_irq_restore(flags);
-}
/*
* clear_bit() doesn't provide any barrier for the compiler.
*/
#define smp_mb__before_clear_bit() barrier()
#define smp_mb__after_clear_bit() barrier()
-static inline void clear_bit(int nr, volatile void * addr)
-{
- int mask;
- volatile unsigned int *a = addr;
- unsigned long flags;
-
- a += nr >> 5;
- mask = 1 << (nr & 0x1f);
- local_irq_save(flags);
- *a &= ~mask;
- local_irq_restore(flags);
-}
-
-static inline void change_bit(int nr, volatile void * addr)
-{
- int mask;
- volatile unsigned int *a = addr;
- unsigned long flags;
-
- a += nr >> 5;
- mask = 1 << (nr & 0x1f);
- local_irq_save(flags);
- *a ^= mask;
- local_irq_restore(flags);
-}
-
-static inline int test_and_set_bit(int nr, volatile void * addr)
-{
- int mask, retval;
- volatile unsigned int *a = addr;
- unsigned long flags;
-
- a += nr >> 5;
- mask = 1 << (nr & 0x1f);
- local_irq_save(flags);
- retval = (mask & *a) != 0;
- *a |= mask;
- local_irq_restore(flags);
-
- return retval;
-}
-
-static inline int test_and_clear_bit(int nr, volatile void * addr)
-{
- int mask, retval;
- volatile unsigned int *a = addr;
- unsigned long flags;
-
- a += nr >> 5;
- mask = 1 << (nr & 0x1f);
- local_irq_save(flags);
- retval = (mask & *a) != 0;
- *a &= ~mask;
- local_irq_restore(flags);
-
- return retval;
-}
-
-static inline int test_and_change_bit(int nr, volatile void * addr)
-{
- int mask, retval;
- volatile unsigned int *a = addr;
- unsigned long flags;
-
- a += nr >> 5;
- mask = 1 << (nr & 0x1f);
- local_irq_save(flags);
- retval = (mask & *a) != 0;
- *a ^= mask;
- local_irq_restore(flags);
-
- return retval;
-}
#include <asm-generic/bitops/non-atomic.h>