include/asm-m68k/cacheflush.h

   1 #ifndef _M68K_CACHEFLUSH_H
   2 #define _M68K_CACHEFLUSH_H
   3
   4 #include <linux/mm.h>
   5
   6 /*
   7  * Cache handling functions
   8  */
   9
  10 #define flush_icache()                                          \
  11 ({                                                              \
  12         if (CPU_IS_040_OR_060)                                  \
  13                 __asm__ __volatile__("nop\n\t"                  \
  14                                      ".chip 68040\n\t"          \
  15                                      "cinva %%ic\n\t"           \
  16                                      ".chip 68k" : );           \
  17         else {                                                  \
  18                 unsigned long _tmp;                             \
  19                 __asm__ __volatile__("movec %%cacr,%0\n\t"      \
  20                                      "orw %1,%0\n\t"            \
  21                                      "movec %0,%%cacr"          \
  22                                      : "=&d" (_tmp)             \
  23                                      : "id" (FLUSH_I)); \
  24         }                                                       \
  25 })
  26
  27 /*
  28  * invalidate the cache for the specified memory range.
  29  * It starts at the physical address specified for
  30  * the given number of bytes.
  31  */
  32 extern void cache_clear(unsigned long paddr, int len);
  33 /*
  34  * push any dirty cache in the specified memory range.
  35  * It starts at the physical address specified for
  36  * the given number of bytes.
  37  */
  38 extern void cache_push(unsigned long paddr, int len);
  39
  40 /*
  41  * push and invalidate pages in the specified user virtual
  42  * memory range.
  43  */
  44 extern void cache_push_v(unsigned long vaddr, int len);
  45
  46 /* cache code */
  47 #define FLUSH_I_AND_D   (0x00000808)
  48 #define FLUSH_I         (0x00000008)
  49
  50 /* This is needed whenever the virtual mapping of the current
  51    process changes.  */
  52 #define __flush_cache_all()                                     \
  53 ({                                                              \
  54         if (CPU_IS_040_OR_060)                                  \
  55                 __asm__ __volatile__("nop\n\t"                  \
  56                                      ".chip 68040\n\t"          \
  57                                      "cpusha %dc\n\t"           \
  58                                      ".chip 68k");              \
  59         else {                                                  \
  60                 unsigned long _tmp;                             \
  61                 __asm__ __volatile__("movec %%cacr,%0\n\t"      \
  62                                      "orw %1,%0\n\t"            \
  63                                      "movec %0,%%cacr"          \
  64                                      : "=&d" (_tmp)             \
  65                                      : "di" (FLUSH_I_AND_D));   \
  66         }                                                       \
  67 })
  68
  69 #define __flush_cache_030()                                     \
  70 ({                                                              \
  71         if (CPU_IS_020_OR_030) {                                \
  72                 unsigned long _tmp;                             \
  73                 __asm__ __volatile__("movec %%cacr,%0\n\t"      \
  74                                      "orw %1,%0\n\t"            \
  75                                      "movec %0,%%cacr"          \
  76                                      : "=&d" (_tmp)             \
  77                                      : "di" (FLUSH_I_AND_D));   \
  78         }                                                       \
  79 })
  80
  81 #define flush_cache_all() __flush_cache_all()
  82
  83 #define flush_cache_vmap(start, end)            flush_cache_all()
  84 #define flush_cache_vunmap(start, end)          flush_cache_all()
  85
  86 static inline void flush_cache_mm(struct mm_struct *mm)
  87 {
  88         if (mm == current->mm)
  89                 __flush_cache_030();
  90 }
  91
  92 /* flush_cache_range/flush_cache_page must be macros to avoid
  93    a dependency on linux/mm.h, which includes this file... */
  94 static inline void flush_cache_range(struct vm_area_struct *vma,
  95                                      unsigned long start,
  96                                      unsigned long end)
  97 {
  98         if (vma->vm_mm == current->mm)
  99                 __flush_cache_030();
 100 }
 101
 102 static inline void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
 103 {
 104         if (vma->vm_mm == current->mm)
 105                 __flush_cache_030();
 106 }
 107
 108
 109 /* Push the page at kernel virtual address and clear the icache */
 110 /* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
 111 static inline void __flush_page_to_ram(void *vaddr)
 112 {
 113         if (CPU_IS_040_OR_060) {
 114                 __asm__ __volatile__("nop\n\t"
 115                                      ".chip 68040\n\t"
 116                                      "cpushp %%bc,(%0)\n\t"
 117                                      ".chip 68k"
 118                                      : : "a" (__pa(vaddr)));
 119         } else {
 120                 unsigned long _tmp;
 121                 __asm__ __volatile__("movec %%cacr,%0\n\t"
 122                                      "orw %1,%0\n\t"
 123                                      "movec %0,%%cacr"
 124                                      : "=&d" (_tmp)
 125                                      : "di" (FLUSH_I));
 126         }
 127 }
 128
 129 #define flush_dcache_page(page)         __flush_page_to_ram(page_address(page))
 130 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
 131 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
 132 #define flush_icache_page(vma, page)    __flush_page_to_ram(page_address(page))
 133
 134 extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
 135                                     unsigned long addr, int len);
 136 extern void flush_icache_range(unsigned long address, unsigned long endaddr);
 137
 138 static inline void copy_to_user_page(struct vm_area_struct *vma,
 139                                      struct page *page, unsigned long vaddr,
 140                                      void *dst, void *src, int len)
 141 {
 142         flush_cache_page(vma, vaddr, page_to_pfn(page));
 143         memcpy(dst, src, len);
 144         flush_icache_user_range(vma, page, vaddr, len);
 145 }
 146 static inline void copy_from_user_page(struct vm_area_struct *vma,
 147                                        struct page *page, unsigned long vaddr,
 148                                        void *dst, void *src, int len)
 149 {
 150         flush_cache_page(vma, vaddr, page_to_pfn(page));
 151         memcpy(dst, src, len);
 152 }
 153
 154 #endif /* _M68K_CACHEFLUSH_H */