diff options
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/include/asm/vio.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/vio.h b/arch/sparc/include/asm/vio.h index fb124feb363b..8174f6cdbbbb 100644 --- a/arch/sparc/include/asm/vio.h +++ b/arch/sparc/include/asm/vio.h @@ -300,6 +300,21 @@ static inline u32 vio_dring_avail(struct vio_dring_state *dr, ((dr->prod - dr->cons) & (ring_size - 1)) - 1); } +static inline u32 vio_dring_next(struct vio_dring_state *dr, u32 index) +{ + if (++index == dr->num_entries) + index = 0; + return index; +} + +static inline u32 vio_dring_prev(struct vio_dring_state *dr, u32 index) +{ + if (index == 0) + return dr->num_entries - 1; + else + return index - 1; +} + #define VIO_MAX_TYPE_LEN 32 #define VIO_MAX_COMPAT_LEN 64 |