include/asm-parisc/cacheflush.h

   1 #ifndef _PARISC_CACHEFLUSH_H
   2 #define _PARISC_CACHEFLUSH_H
   3
   4 #include <linux/mm.h>
   5 #include <asm/cache.h>  /* for flush_user_dcache_range_asm() proto */
   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_cache_dup_mm(mm) flush_cache_mm(mm)
  19
  20 #define flush_kernel_dcache_range(start,size) \
  21         flush_kernel_dcache_range_asm((start), (start)+(size));
  22
  23 extern void flush_cache_all_local(void);
  24
  25 static inline void cacheflush_h_tmp_function(void *dummy)
  26 {
  27         flush_cache_all_local();
  28 }
  29
  30 static inline void flush_cache_all(void)
  31 {
  32         on_each_cpu(cacheflush_h_tmp_function, NULL, 1, 1);
  33 }
  34
  35 #define flush_cache_vmap(start, end)            flush_cache_all()
  36 #define flush_cache_vunmap(start, end)          flush_cache_all()
  37
  38 extern int parisc_cache_flush_threshold;
  39 void parisc_setup_cache_timing(void);
  40
  41 static inline void
  42 flush_user_dcache_range(unsigned long start, unsigned long end)
  43 {
  44         if ((end - start) < parisc_cache_flush_threshold)
  45                 flush_user_dcache_range_asm(start,end);
  46         else
  47                 flush_data_cache();
  48 }
  49
  50 static inline void
  51 flush_user_icache_range(unsigned long start, unsigned long end)
  52 {
  53         if ((end - start) < parisc_cache_flush_threshold)
  54                 flush_user_icache_range_asm(start,end);
  55         else
  56                 flush_instruction_cache();
  57 }
  58
  59 extern void flush_dcache_page(struct page *page);
  60
  61 #define flush_dcache_mmap_lock(mapping) \
  62         write_lock_irq(&(mapping)->tree_lock)
  63 #define flush_dcache_mmap_unlock(mapping) \
  64         write_unlock_irq(&(mapping)->tree_lock)
  65
  66 #define flush_icache_page(vma,page)     do { flush_kernel_dcache_page(page); flush_kernel_icache_page(page_address(page)); } while (0)
  67
  68 #define flush_icache_range(s,e)         do { flush_kernel_dcache_range_asm(s,e); flush_kernel_icache_range_asm(s,e); } while (0)
  69
  70 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
  71 do { \
  72         flush_cache_page(vma, vaddr, page_to_pfn(page)); \
  73         memcpy(dst, src, len); \
  74         flush_kernel_dcache_range_asm((unsigned long)dst, (unsigned long)dst + len); \
  75 } while (0)
  76
  77 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
  78 do { \
  79         flush_cache_page(vma, vaddr, page_to_pfn(page)); \
  80         memcpy(dst, src, len); \
  81 } while (0)
  82
  83 static inline void flush_cache_range(struct vm_area_struct *vma,
  84                 unsigned long start, unsigned long end)
  85 {
  86         int sr3;
  87
  88         if (!vma->vm_mm->context) {
  89                 BUG();
  90                 return;
  91         }
  92
  93         sr3 = mfsp(3);
  94         if (vma->vm_mm->context == sr3) {
  95                 flush_user_dcache_range(start,end);
  96                 flush_user_icache_range(start,end);
  97         } else {
  98                 flush_cache_all();
  99         }
 100 }
 101
 102 /* Simple function to work out if we have an existing address translation
 103  * for a user space vma. */
 104 static inline int translation_exists(struct vm_area_struct *vma,
 105                                 unsigned long addr, unsigned long pfn)
 106 {
 107         pgd_t *pgd = pgd_offset(vma->vm_mm, addr);
 108         pmd_t *pmd;
 109         pte_t pte;
 110
 111         if(pgd_none(*pgd))
 112                 return 0;
 113
 114         pmd = pmd_offset(pgd, addr);
 115         if(pmd_none(*pmd) || pmd_bad(*pmd))
 116                 return 0;
 117
 118         /* We cannot take the pte lock here: flush_cache_page is usually
 119          * called with pte lock already held.  Whereas flush_dcache_page
 120          * takes flush_dcache_mmap_lock, which is lower in the hierarchy:
 121          * the vma itself is secure, but the pte might come or go racily.
 122          */
 123         pte = *pte_offset_map(pmd, addr);
 124         /* But pte_unmap() does nothing on this architecture */
 125
 126         /* Filter out coincidental file entries and swap entries */
 127         if (!(pte_val(pte) & (_PAGE_FLUSH|_PAGE_PRESENT)))
 128                 return 0;
 129
 130         return pte_pfn(pte) == pfn;
 131 }
 132
 133 /* Private function to flush a page from the cache of a non-current
 134  * process.  cr25 contains the Page Directory of the current user
 135  * process; we're going to hijack both it and the user space %sr3 to
 136  * temporarily make the non-current process current.  We have to do
 137  * this because cache flushing may cause a non-access tlb miss which
 138  * the handlers have to fill in from the pgd of the non-current
 139  * process. */
 140 static inline void
 141 flush_user_cache_page_non_current(struct vm_area_struct *vma,
 142                                   unsigned long vmaddr)
 143 {
 144         /* save the current process space and pgd */
 145         unsigned long space = mfsp(3), pgd = mfctl(25);
 146
 147         /* we don't mind taking interrups since they may not
 148          * do anything with user space, but we can't
 149          * be preempted here */
 150         preempt_disable();
 151
 152         /* make us current */
 153         mtctl(__pa(vma->vm_mm->pgd), 25);
 154         mtsp(vma->vm_mm->context, 3);
 155
 156         flush_user_dcache_page(vmaddr);
 157         if(vma->vm_flags & VM_EXEC)
 158                 flush_user_icache_page(vmaddr);
 159
 160         /* put the old current process back */
 161         mtsp(space, 3);
 162         mtctl(pgd, 25);
 163         preempt_enable();
 164 }
 165
 166 static inline void
 167 __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr)
 168 {
 169         if (likely(vma->vm_mm->context == mfsp(3))) {
 170                 flush_user_dcache_page(vmaddr);
 171                 if (vma->vm_flags & VM_EXEC)
 172                         flush_user_icache_page(vmaddr);
 173         } else {
 174                 flush_user_cache_page_non_current(vma, vmaddr);
 175         }
 176 }
 177
 178 static inline void
 179 flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
 180 {
 181         BUG_ON(!vma->vm_mm->context);
 182
 183         if (likely(translation_exists(vma, vmaddr, pfn)))
 184                 __flush_cache_page(vma, vmaddr);
 185
 186 }
 187
 188 static inline void
 189 flush_anon_page(struct page *page, unsigned long vmaddr)
 190 {
 191         if (PageAnon(page))
 192                 flush_user_dcache_page(vmaddr);
 193 }
 194 #define ARCH_HAS_FLUSH_ANON_PAGE
 195
 196 #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
 197 void flush_kernel_dcache_page_addr(void *addr);
 198 static inline void flush_kernel_dcache_page(struct page *page)
 199 {
 200         flush_kernel_dcache_page_addr(page_address(page));
 201 }
 202
 203 #ifdef CONFIG_DEBUG_RODATA
 204 void mark_rodata_ro(void);
 205 #endif
 206
 207 #ifdef CONFIG_PA8X00
 208 /* Only pa8800, pa8900 needs this */
 209 #define ARCH_HAS_KMAP
 210
 211 void kunmap_parisc(void *addr);
 212
 213 static inline void *kmap(struct page *page)
 214 {
 215         might_sleep();
 216         return page_address(page);
 217 }
 218
 219 #define kunmap(page)                    kunmap_parisc(page_address(page))
 220
 221 #define kmap_atomic(page, idx)          page_address(page)
 222
 223 #define kunmap_atomic(addr, idx)        kunmap_parisc(addr)
 224
 225 #define kmap_atomic_pfn(pfn, idx)       page_address(pfn_to_page(pfn))
 226 #define kmap_atomic_to_page(ptr)        virt_to_page(ptr)
 227 #endif
 228
 229 #endif /* _PARISC_CACHEFLUSH_H */
 230