diff options
| author | Suresh Warrier <warrier@linux.vnet.ibm.com> | 2016-08-19 15:35:45 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2016-09-09 16:17:59 +1000 |
| commit | 07b1fdf5bd135d94eff2b3a6849b90c358963066 (patch) | |
| tree | 4ca83bc39c1d4932fcec17b6392a6c5ef3359c2b /arch/powerpc/include/asm/io.h | |
| parent | 0eeede0c63305a33de31bd90b53b023c1d452c17 (diff) | |
| download | linux-07b1fdf5bd135d94eff2b3a6849b90c358963066.tar.bz2 | |
powerpc: Add simple cache inhibited MMIO accessors
Add simple cache inhibited accessors for memory mapped I/O.
Unlike the accessors built from the DEF_MMIO_* macros, these
don't include any hardware memory barriers, callers need to
manage memory barriers on their own. These can only be called
in hypervisor real mode.
Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
[paulus@ozlabs.org - added line to comment]
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/include/asm/io.h')
| -rw-r--r-- | arch/powerpc/include/asm/io.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h index 2fd1690b79d2..f6fda8482f60 100644 --- a/arch/powerpc/include/asm/io.h +++ b/arch/powerpc/include/asm/io.h @@ -241,6 +241,35 @@ static inline void out_be64(volatile u64 __iomem *addr, u64 val) #endif #endif /* __powerpc64__ */ + +/* + * Simple Cache inhibited accessors + * Unlike the DEF_MMIO_* macros, these don't include any h/w memory + * barriers, callers need to manage memory barriers on their own. + * These can only be used in hypervisor real mode. + */ + +static inline u32 _lwzcix(unsigned long addr) +{ + u32 ret; + + __asm__ __volatile__("lwzcix %0,0, %1" + : "=r" (ret) : "r" (addr) : "memory"); + return ret; +} + +static inline void _stbcix(u64 addr, u8 val) +{ + __asm__ __volatile__("stbcix %0,0,%1" + : : "r" (val), "r" (addr) : "memory"); +} + +static inline void _stwcix(u64 addr, u32 val) +{ + __asm__ __volatile__("stwcix %0,0,%1" + : : "r" (val), "r" (addr) : "memory"); +} + /* * Low level IO stream instructions are defined out of line for now */ |