include/asm-parisc/cacheflush.h

   1 #ifndef _PARISC_CACHEFLUSH_H
   2 #define _PARISC_CACHEFLUSH_H
   3
   4 #include <linux/config.h>
   5 #include <linux/mm.h>
   6
   7 /* The usual comment is "Caches aren't brain-dead on the <architecture>".
   8  * Unfortunately, that doesn't apply to PA-RISC. */
   9
  10 /* Cache flush operations */
  11
  12 #ifdef CONFIG_SMP
  13 #define flush_cache_mm(mm) flush_cache_all()
  14 #else
  15 #define flush_cache_mm(mm) flush_cache_all_local()
  16 #endif
  17
  18 #define flush_kernel_dcache_range(start,size) \
  19         flush_kernel_dcache_range_asm((start), (start)+(size));
  20
  21 extern void flush_cache_all_local(void);
  22
  23 static inline void cacheflush_h_tmp_function(void *dummy)
  24 {
  25         flush_cache_all_local();
  26 }
  27
  28 static inline void flush_cache_all(void)
  29 {
  30         on_each_cpu(cacheflush_h_tmp_function, NULL, 1, 1);
  31 }
  32
  33 #define flush_cache_vmap(start, end)            flush_cache_all()
  34 #define flush_cache_vunmap(start, end)          flush_cache_all()
  35
  36 extern int parisc_cache_flush_threshold;
  37 void parisc_setup_cache_timing(void);
  38
  39 static inline void
  40 flush_user_dcache_range(unsigned long start, unsigned long end)
  41 {
  42         if ((end - start) < parisc_cache_flush_threshold)
  43                 flush_user_dcache_range_asm(start,end);
  44         else
  45                 flush_data_cache();
  46 }
  47
  48 static inline void
  49 flush_user_icache_range(unsigned long start, unsigned long end)
  50 {
  51         if ((end - start) < parisc_cache_flush_threshold)
  52                 flush_user_icache_range_asm(start,end);
  53         else
  54                 flush_instruction_cache();
  55 }
  56
  57 extern void flush_dcache_page(struct page *page);
  58
  59 #define flush_dcache_mmap_lock(mapping) \
  60         write_lock_irq(&(mapping)->tree_lock)
  61 #define flush_dcache_mmap_unlock(mapping) \
  62         write_unlock_irq(&(mapping)->tree_lock)
  63
  64 #define flush_icache_page(vma,page)     do { flush_kernel_dcache_page(page_address(page)); flush_kernel_icache_page(page_address(page)); } while (0)
  65
  66 #define flush_icache_range(s,e)         do { flush_kernel_dcache_range_asm(s,e); flush_kernel_icache_range_asm(s,e); } while (0)
  67
  68 #define copy_to_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         flush_kernel_dcache_range_asm((unsigned long)dst, (unsigned long)dst + len); \
  73 } while (0)
  74
  75 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
  76 do { \
  77         flush_cache_page(vma, vaddr, page_to_pfn(page)); \
  78         memcpy(dst, src, len); \
  79 } while (0)
  80
  81 static inline void flush_cache_range(struct vm_area_struct *vma,
  82                 unsigned long start, unsigned long end)
  83 {
  84         int sr3;
  85
  86         if (!vma->vm_mm->context) {
  87                 BUG();
  88                 return;
  89         }
  90
  91         sr3 = mfsp(3);
  92         if (vma->vm_mm->context == sr3) {
  93                 flush_user_dcache_range(start,end);
  94                 flush_user_icache_range(start,end);
  95         } else {
  96                 flush_cache_all();
  97         }
  98 }
  99
 100 /* Simple function to work out if we have an existing address translation
 101  * for a user space vma. */
 102 static inline pte_t *__translation_exists(struct mm_struct *mm,
 103                                           unsigned long addr)
 104 {
 105         pgd_t *pgd = pgd_offset(mm, addr);
 106         pmd_t *pmd;
 107         pte_t *pte;
 108
 109         if(pgd_none(*pgd))
 110                 return NULL;
 111
 112         pmd = pmd_offset(pgd, addr);
 113         if(pmd_none(*pmd) || pmd_bad(*pmd))
 114                 return NULL;
 115
 116         pte = pte_offset_map(pmd, addr);
 117
 118         /* The PA flush mappings show up as pte_none, but they're
 119          * valid none the less */
 120         if(pte_none(*pte) && ((pte_val(*pte) & _PAGE_FLUSH) == 0))
 121                 return NULL;
 122         return pte;
 123 }
 124 #define translation_exists(vma, addr)   __translation_exists((vma)->vm_mm, addr)
 125
 126
 127 /* Private function to flush a page from the cache of a non-current
 128  * process.  cr25 contains the Page Directory of the current user
 129  * process; we're going to hijack both it and the user space %sr3 to
 130  * temporarily make the non-current process current.  We have to do
 131  * this because cache flushing may cause a non-access tlb miss which
 132  * the handlers have to fill in from the pgd of the non-current
 133  * process. */
 134 static inline void
 135 flush_user_cache_page_non_current(struct vm_area_struct *vma,
 136                                   unsigned long vmaddr)
 137 {
 138         /* save the current process space and pgd */
 139         unsigned long space = mfsp(3), pgd = mfctl(25);
 140
 141         /* we don't mind taking interrups since they may not
 142          * do anything with user space, but we can't
 143          * be preempted here */
 144         preempt_disable();
 145
 146         /* make us current */
 147         mtctl(__pa(vma->vm_mm->pgd), 25);
 148         mtsp(vma->vm_mm->context, 3);
 149
 150         flush_user_dcache_page(vmaddr);
 151         if(vma->vm_flags & VM_EXEC)
 152                 flush_user_icache_page(vmaddr);
 153
 154         /* put the old current process back */
 155         mtsp(space, 3);
 156         mtctl(pgd, 25);
 157         preempt_enable();
 158 }
 159
 160 static inline void
 161 __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
 162 {
 163         if (likely(vma->vm_mm->context == mfsp(3))) {
 164                 flush_user_dcache_page(vmaddr);
 165                 if (vma->vm_flags & VM_EXEC)
 166                         flush_user_icache_page(vmaddr);
 167         } else {
 168                 flush_user_cache_page_non_current(vma, vmaddr);
 169         }
 170 }
 171
 172 static inline void
 173 flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
 174 {
 175         BUG_ON(!vma->vm_mm->context);
 176
 177         if(likely(translation_exists(vma, vmaddr)))
 178                 __flush_cache_page(vma, vmaddr);
 179
 180 }
 181 #endif
 182