arch/sh/include/asm/cacheflush.h

   1 #ifndef __ASM_SH_CACHEFLUSH_H
   2 #define __ASM_SH_CACHEFLUSH_H
   3
   4 #ifdef __KERNEL__
   5
   6 #ifdef CONFIG_CACHE_OFF
   7 /*
   8  * Nothing to do when the cache is disabled, initial flush and explicit
   9  * disabling is handled at CPU init time.
  10  *
  11  * See arch/sh/kernel/cpu/init.c:cache_init().
  12  */
  13 #define p3_cache_init()                         do { } while (0)
  14 #define flush_cache_all()                       do { } while (0)
  15 #define flush_cache_mm(mm)                      do { } while (0)
  16 #define flush_cache_dup_mm(mm)                  do { } while (0)
  17 #define flush_cache_range(vma, start, end)      do { } while (0)
  18 #define flush_cache_page(vma, vmaddr, pfn)      do { } while (0)
  19 #define flush_dcache_page(page)                 do { } while (0)
  20 #define flush_icache_range(start, end)          do { } while (0)
  21 #define flush_icache_page(vma,pg)               do { } while (0)
  22 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
  23 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
  24 #define flush_cache_sigtramp(vaddr)             do { } while (0)
  25 #define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
  26 #define __flush_wback_region(start, size)       do { (void)(start); } while (0)
  27 #define __flush_purge_region(start, size)       do { (void)(start); } while (0)
  28 #define __flush_invalidate_region(start, size)  do { (void)(start); } while (0)
  29 #else
  30 #include <cpu/cacheflush.h>
  31
  32 /*
  33  * Consistent DMA requires that the __flush_xxx() primitives must be set
  34  * for any of the enabled non-coherent caches (most of the UP CPUs),
  35  * regardless of PIPT or VIPT cache configurations.
  36  */
  37
  38 /* Flush (write-back only) a region (smaller than a page) */
  39 extern void __flush_wback_region(void *start, int size);
  40 /* Flush (write-back & invalidate) a region (smaller than a page) */
  41 extern void __flush_purge_region(void *start, int size);
  42 /* Flush (invalidate only) a region (smaller than a page) */
  43 extern void __flush_invalidate_region(void *start, int size);
  44 #endif
  45
  46 #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
  47 static inline void flush_kernel_dcache_page(struct page *page)
  48 {
  49         flush_dcache_page(page);
  50 }
  51
  52 #if defined(CONFIG_CPU_SH4) && !defined(CONFIG_CACHE_OFF)
  53 extern void copy_to_user_page(struct vm_area_struct *vma,
  54         struct page *page, unsigned long vaddr, void *dst, const void *src,
  55         unsigned long len);
  56
  57 extern void copy_from_user_page(struct vm_area_struct *vma,
  58         struct page *page, unsigned long vaddr, void *dst, const void *src,
  59         unsigned long len);
  60 #else
  61 #define copy_to_user_page(vma, page, vaddr, dst, src, len)      \
  62         do {                                                    \
  63                 flush_cache_page(vma, vaddr, page_to_pfn(page));\
  64                 memcpy(dst, src, len);                          \
  65                 flush_icache_user_range(vma, page, vaddr, len); \
  66         } while (0)
  67
  68 #define copy_from_user_page(vma, page, vaddr, dst, src, len)    \
  69         do {                                                    \
  70                 flush_cache_page(vma, vaddr, page_to_pfn(page));\
  71                 memcpy(dst, src, len);                          \
  72         } while (0)
  73 #endif
  74
  75 #define flush_cache_vmap(start, end)            flush_cache_all()
  76 #define flush_cache_vunmap(start, end)          flush_cache_all()
  77
  78 #define HAVE_ARCH_UNMAPPED_AREA
  79
  80 #endif /* __KERNEL__ */
  81 #endif /* __ASM_SH_CACHEFLUSH_H */