diff options
author | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-05-11 02:20:06 +0900 |
---|---|---|
committer | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-06-23 13:35:49 +0900 |
commit | d2a5f4999f6c211adf30d9788349e13988d6f2a7 (patch) | |
tree | 95f6ef1d8b1d4e3e078e462cc3ae73a4b519bc53 /arch/h8300/include/asm/atomic.h | |
parent | a2ed0c57a546f5d99f795e97cd0b2769882031bc (diff) | |
download | linux-d2a5f4999f6c211adf30d9788349e13988d6f2a7.tar.gz linux-d2a5f4999f6c211adf30d9788349e13988d6f2a7.tar.bz2 linux-d2a5f4999f6c211adf30d9788349e13988d6f2a7.zip |
h8300: Assembly headers
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Diffstat (limited to 'arch/h8300/include/asm/atomic.h')
-rw-r--r-- | arch/h8300/include/asm/atomic.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/arch/h8300/include/asm/atomic.h b/arch/h8300/include/asm/atomic.h new file mode 100644 index 000000000000..7ca73f8546cc --- /dev/null +++ b/arch/h8300/include/asm/atomic.h @@ -0,0 +1,159 @@ +#ifndef __ARCH_H8300_ATOMIC__ +#define __ARCH_H8300_ATOMIC__ + +#include <linux/types.h> +#include <asm/cmpxchg.h> + +/* + * Atomic operations that C can't guarantee us. Useful for + * resource counting etc.. + */ + +#define ATOMIC_INIT(i) { (i) } + +#define atomic_read(v) ACCESS_ONCE((v)->counter) +#define atomic_set(v, i) (((v)->counter) = i) + +#include <linux/kernel.h> + +static inline int atomic_add_return(int i, atomic_t *v) +{ + h8300flags flags; + int ret; + + flags = arch_local_irq_save(); + ret = v->counter += i; + arch_local_irq_restore(flags); + return ret; +} + +#define atomic_add(i, v) atomic_add_return(i, v) +#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) + +static inline int atomic_sub_return(int i, atomic_t *v) +{ + h8300flags flags; + int ret; + + flags = arch_local_irq_save(); + ret = v->counter -= i; + arch_local_irq_restore(flags); + return ret; +} + +#define atomic_sub(i, v) atomic_sub_return(i, v) +#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) + +static inline int atomic_inc_return(atomic_t *v) +{ + h8300flags flags; + int ret; + + flags = arch_local_irq_save(); + v->counter++; + ret = v->counter; + arch_local_irq_restore(flags); + return ret; +} + +#define atomic_inc(v) atomic_inc_return(v) + +/* + * atomic_inc_and_test - increment and test + * @v: pointer of type atomic_t + * + * Atomically increments @v by 1 + * and returns true if the result is zero, or false for all + * other cases. + */ +#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) + +static inline int atomic_dec_return(atomic_t *v) +{ + h8300flags flags; + int ret; + + flags = arch_local_irq_save(); + --v->counter; + ret = v->counter; + arch_local_irq_restore(flags); + return ret; +} + +#define atomic_dec(v) atomic_dec_return(v) + +static inline int atomic_dec_and_test(atomic_t *v) +{ + h8300flags flags; + int ret; + + flags = arch_local_irq_save(); + --v->counter; + ret = v->counter; + arch_local_irq_restore(flags); + return ret == 0; +} + +static inline int atomic_cmpxchg(atomic_t *v, int old, int new) +{ + int ret; + h8300flags flags; + + flags = arch_local_irq_save(); + ret = v->counter; + if (likely(ret == old)) + v->counter = new; + arch_local_irq_restore(flags); + return ret; +} + +static inline int __atomic_add_unless(atomic_t *v, int a, int u) +{ + int ret; + h8300flags flags; + + flags = arch_local_irq_save(); + ret = v->counter; + if (ret != u) + v->counter += a; + arch_local_irq_restore(flags); + return ret; +} + +static inline void atomic_clear_mask(unsigned long mask, unsigned long *v) +{ + unsigned char ccr; + unsigned long tmp; + + __asm__ __volatile__("stc ccr,%w3\n\t" + "orc #0x80,ccr\n\t" + "mov.l %0,%1\n\t" + "and.l %2,%1\n\t" + "mov.l %1,%0\n\t" + "ldc %w3,ccr" + : "=m"(*v), "=r"(tmp) + : "g"(~(mask)), "r"(ccr)); +} + +static inline void atomic_set_mask(unsigned long mask, unsigned long *v) +{ + unsigned char ccr; + unsigned long tmp; + + __asm__ __volatile__("stc ccr,%w3\n\t" + "orc #0x80,ccr\n\t" + "mov.l %0,%1\n\t" + "or.l %2,%1\n\t" + "mov.l %1,%0\n\t" + "ldc %w3,ccr" + : "=m"(*v), "=r"(tmp) + : "g"(~(mask)), "r"(ccr)); +} + +/* Atomic operations are already serializing */ +#define smp_mb__before_atomic_dec() barrier() +#define smp_mb__after_atomic_dec() barrier() +#define smp_mb__before_atomic_inc() barrier() +#define smp_mb__after_atomic_inc() barrier() + +#endif /* __ARCH_H8300_ATOMIC __ */ |