include/asm-m68k/cacheflush.h

   1 #ifndef _M68K_CACHEFLUSH_H
   2 #define _M68K_CACHEFLUSH_H
   3
   4 #include <linux/mm.h>
   5
   6 /* cache code */
   7 #define FLUSH_I_AND_D   (0x00000808)
   8 #define FLUSH_I         (0x00000008)
   9
  10 /*
  11  * Cache handling functions
  12  */
  13
  14 static inline void flush_icache(void)
  15 {
  16         if (CPU_IS_040_OR_060)
  17                 asm volatile (  "nop\n"
  18                         "       .chip   68040\n"
  19                         "       cpusha  %bc\n"
  20                         "       .chip   68k");
  21         else {
  22                 unsigned long tmp;
  23                 asm volatile (  "movec  %%cacr,%0\n"
  24                         "       or.w    %1,%0\n"
  25                         "       movec   %0,%%cacr"
  26                         : "=&d" (tmp)
  27                         : "id" (FLUSH_I));
  28         }
  29 }
  30
  31 /*
  32  * invalidate the cache for the specified memory range.
  33  * It starts at the physical address specified for
  34  * the given number of bytes.
  35  */
  36 extern void cache_clear(unsigned long paddr, int len);
  37 /*
  38  * push any dirty cache in the specified memory range.
  39  * It starts at the physical address specified for
  40  * the given number of bytes.
  41  */
  42 extern void cache_push(unsigned long paddr, int len);
  43
  44 /*
  45  * push and invalidate pages in the specified user virtual
  46  * memory range.
  47  */
  48 extern void cache_push_v(unsigned long vaddr, int len);
  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 */