diff options
| author | Kyle McMartin <kyle@parisc-linux.org> | 2006-08-13 22:15:47 -0400 |
|---|---|---|
| committer | Matthew Wilcox <willy@parisc-linux.org> | 2006-10-04 06:44:47 -0600 |
| commit | 4068d93cd17561bcbfc821c831cb048385320bd6 (patch) | |
| tree | db2e8f3ad3c8ab729cff1304cba984a4bc0a3735 /include/asm-parisc/prefetch.h | |
| parent | 78b656b8bf933101b42409b4492734b23427bfc3 (diff) | |
[PARISC] Untangle <asm/processor.h> header include mess
asm/processor.h on parisc wants spinlocks for cpuinfo, but
linux/spinlock_types.h needs lockdep, and lockdep wants prefetch.
This leads to a horrible circular dependancy, because <asm/processor.h>
is including something which depends on things which are not defined
until the end of the file.
Kludge around this by moving prefetch related code into <asm/prefetch.h>
and including it before <linux/spinlock_types.h>, however this is just
a temporary solution until this mess can be cleaned up.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'include/asm-parisc/prefetch.h')
| -rw-r--r-- | include/asm-parisc/prefetch.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/asm-parisc/prefetch.h b/include/asm-parisc/prefetch.h new file mode 100644 index 00000000000..f5a2e7ae266 --- /dev/null +++ b/include/asm-parisc/prefetch.h @@ -0,0 +1,36 @@ +/* + * include/asm-parisc/prefetch.h + * + * PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book. + * In addition, many implementations do hardware prefetching of both + * instructions and data. + * + * PA7300LC (page 14-4 of the ERS) also implements prefetching by a load + * to gr0 but not in a way that Linux can use. If the load would cause an + * interruption (eg due to prefetching 0), it is suppressed on PA2.0 + * processors, but not on 7300LC. + * + */ + +#ifndef __ASM_PARISC_PREFETCH_H +#define __ASM_PARISC_PREFETCH_H + +#ifndef __ASSEMBLY__ +#ifdef CONFIG_PREFETCH + +#define ARCH_HAS_PREFETCH +extern inline void prefetch(const void *addr) +{ + __asm__("ldw 0(%0), %%r0" : : "r" (addr)); +} + +#define ARCH_HAS_PREFETCHW +extern inline void prefetchw(const void *addr) +{ + __asm__("ldd 0(%0), %%r0" : : "r" (addr)); +} + +#endif /* CONFIG_PREFETCH */ +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_PARISC_PROCESSOR_H */ |