lkml.org 
[lkml]   [2009]   [Apr]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Date
    Subject[PATCH 07/27] asm-generic: add minimal cache description
    Many architectures have a 32 byte cache line and never
    require flushing the cache, so they can use these
    generic implementation.

    Signed-off-by: Arnd Bergmann <arnd@arndb.de>
    Signed-off-by: Remis Lima Baima <remis.developer@googlemail.com>
    ---
    include/asm-generic/cache.h | 12 ++++++++++++
    include/asm-generic/cacheflush.h | 30 ++++++++++++++++++++++++++++++
    2 files changed, 42 insertions(+), 0 deletions(-)
    create mode 100644 include/asm-generic/cache.h
    create mode 100644 include/asm-generic/cacheflush.h

    diff --git a/include/asm-generic/cache.h b/include/asm-generic/cache.h
    new file mode 100644
    index 0000000..1bfcfe5
    --- /dev/null
    +++ b/include/asm-generic/cache.h
    @@ -0,0 +1,12 @@
    +#ifndef __ASM_GENERIC_CACHE_H
    +#define __ASM_GENERIC_CACHE_H
    +/*
    + * 32 bytes appears to be the most common cache line size,
    + * so make that the default here. Architectures with larger
    + * cache lines need to provide their own cache.h.
    + */
    +
    +#define L1_CACHE_SHIFT 5
    +#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
    +
    +#endif /* __ASM_GENERIC_CACHE_H */
    diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h
    new file mode 100644
    index 0000000..ba4ec39
    --- /dev/null
    +++ b/include/asm-generic/cacheflush.h
    @@ -0,0 +1,30 @@
    +#ifndef __ASM_CACHEFLUSH_H
    +#define __ASM_CACHEFLUSH_H
    +
    +/* Keep includes the same across arches. */
    +#include <linux/mm.h>
    +
    +/*
    + * The cache doesn't need to be flushed when TLB entries change when
    + * the cache is mapped to physical memory, not virtual memory
    + */
    +#define flush_cache_all() do { } while (0)
    +#define flush_cache_mm(mm) do { } while (0)
    +#define flush_cache_dup_mm(mm) do { } while (0)
    +#define flush_cache_range(vma, start, end) do { } while (0)
    +#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
    +#define flush_dcache_page(page) do { } while (0)
    +#define flush_dcache_mmap_lock(mapping) do { } while (0)
    +#define flush_dcache_mmap_unlock(mapping) do { } while (0)
    +#define flush_icache_range(start, end) do { } while (0)
    +#define flush_icache_page(vma,pg) do { } while (0)
    +#define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
    +#define flush_cache_vmap(start, end) do { } while (0)
    +#define flush_cache_vunmap(start, end) do { } while (0)
    +
    +#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
    + memcpy(dst, src, len)
    +#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
    + memcpy(dst, src, len)
    +
    +#endif /* __ASM_CACHEFLUSH_H */
    --
    1.5.6.3



    \
     
     \ /
      Last update: 2009-04-30 17:49    [W:0.040 / U:60.084 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site