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authorStuart Menefy <stuart.menefy@st.com>2007-11-30 10:12:36 +0300
committerPaul Mundt <lethal@linux-sh.org>2008-01-28 07:18:58 +0300
commit1efe4ce3ca126da77e450d5a83f7201949d76f62 (patch)
treefbae9902aa4103a9e86d06f841d580f24682e7b3 /include/asm-sh/bitops.h
parent53ff09422e5e7a6d6198b767c8f494e43ec8e3ae (diff)
downloadlinux-1efe4ce3ca126da77e450d5a83f7201949d76f62.tar.xz
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>
Diffstat (limited to 'include/asm-sh/bitops.h')
-rw-r--r--include/asm-sh/bitops.h91
1 files changed, 6 insertions, 85 deletions
diff --git a/include/asm-sh/bitops.h b/include/asm-sh/bitops.h
index a7bd81a7f064..b6ba5a60dec2 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;
-
- a += nr >> 5;
- mask = 1 << (nr & 0x1f);
- local_irq_save(flags);
- *a |= mask;
- local_irq_restore(flags);
-}
+#ifdef CONFIG_GUSA_RB
+#include <asm/bitops-grb.h>
+#else
+#include <asm/bitops-irq.h>
+#endif
+
/*
* 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>