arch/mips/include/asm/cacheflush.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
   7  * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
   8  */
   9 #ifndef _ASM_CACHEFLUSH_H
  10 #define _ASM_CACHEFLUSH_H
  11
  12 /* Keep includes the same across arches.  */
  13 #include <linux/mm.h>
  14 #include <asm/cpu-features.h>
  15
  16 /* Cache flushing:
  17  *
  18  *  - flush_cache_all() flushes entire cache
  19  *  - flush_cache_mm(mm) flushes the specified mm context's cache lines
  20  *  - flush_cache_dup mm(mm) handles cache flushing when forking
  21  *  - flush_cache_page(mm, vmaddr, pfn) flushes a single page
  22  *  - flush_cache_range(vma, start, end) flushes a range of pages
  23  *  - flush_icache_range(start, end) flush a range of instructions
  24  *  - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
  25  *
  26  * MIPS specific flush operations:
  27  *
  28  *  - flush_cache_sigtramp() flush signal trampoline
  29  *  - flush_icache_all() flush the entire instruction cache
  30  *  - flush_data_cache_page() flushes a page from the data cache
  31  */
  32 extern void (*flush_cache_all)(void);
  33 extern void (*__flush_cache_all)(void);
  34 extern void (*flush_cache_mm)(struct mm_struct *mm);
  35 #define flush_cache_dup_mm(mm)  do { (void) (mm); } while (0)
  36 extern void (*flush_cache_range)(struct vm_area_struct *vma,
  37         unsigned long start, unsigned long end);
  38 extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
  39 extern void __flush_dcache_page(struct page *page);
  40
  41 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
  42 static inline void flush_dcache_page(struct page *page)
  43 {
  44         if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
  45                 __flush_dcache_page(page);
  46
  47 }
  48
  49 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
  50 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
  51
  52 #define ARCH_HAS_FLUSH_ANON_PAGE
  53 extern void __flush_anon_page(struct page *, unsigned long);
  54 static inline void flush_anon_page(struct vm_area_struct *vma,
  55         struct page *page, unsigned long vmaddr)
  56 {
  57         if (cpu_has_dc_aliases && PageAnon(page))
  58                 __flush_anon_page(page, vmaddr);
  59 }
  60
  61 static inline void flush_icache_page(struct vm_area_struct *vma,
  62         struct page *page)
  63 {
  64 }
  65
  66 extern void (*flush_icache_range)(unsigned long start, unsigned long end);
  67 extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
  68
  69 extern void (*__flush_cache_vmap)(void);
  70
  71 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
  72 {
  73         if (cpu_has_dc_aliases)
  74                 __flush_cache_vmap();
  75 }
  76
  77 extern void (*__flush_cache_vunmap)(void);
  78
  79 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
  80 {
  81         if (cpu_has_dc_aliases)
  82                 __flush_cache_vunmap();
  83 }
  84
  85 extern void copy_to_user_page(struct vm_area_struct *vma,
  86         struct page *page, unsigned long vaddr, void *dst, const void *src,
  87         unsigned long len);
  88
  89 extern void copy_from_user_page(struct vm_area_struct *vma,
  90         struct page *page, unsigned long vaddr, void *dst, const void *src,
  91         unsigned long len);
  92
  93 extern void (*flush_cache_sigtramp)(unsigned long addr);
  94 extern void (*flush_icache_all)(void);
  95 extern void (*local_flush_data_cache_page)(void * addr);
  96 extern void (*flush_data_cache_page)(unsigned long addr);
  97
  98 /*
  99  * This flag is used to indicate that the page pointed to by a pte
 100  * is dirty and requires cleaning before returning it to the user.
 101  */
 102 #define PG_dcache_dirty                 PG_arch_1
 103
 104 #define Page_dcache_dirty(page)         \
 105         test_bit(PG_dcache_dirty, &(page)->flags)
 106 #define SetPageDcacheDirty(page)        \
 107         set_bit(PG_dcache_dirty, &(page)->flags)
 108 #define ClearPageDcacheDirty(page)      \
 109         clear_bit(PG_dcache_dirty, &(page)->flags)
 110
 111 /* Run kernel code uncached, useful for cache probing functions. */
 112 unsigned long run_uncached(void *func);
 113
 114 extern void *kmap_coherent(struct page *page, unsigned long addr);
 115 extern void kunmap_coherent(void);
 116
 117 #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
 118 static inline void flush_kernel_dcache_page(struct page *page)
 119 {
 120         BUG_ON(cpu_has_dc_aliases && PageHighMem(page));
 121 }
 122
 123 /*
 124  * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
 125  * cache writeback and invalidate operation.
 126  */
 127 extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
 128
 129 static inline void flush_kernel_vmap_range(void *vaddr, int size)
 130 {
 131         if (cpu_has_dc_aliases)
 132                 __flush_kernel_vmap_range((unsigned long) vaddr, size);
 133 }
 134
 135 static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
 136 {
 137         if (cpu_has_dc_aliases)
 138                 __flush_kernel_vmap_range((unsigned long) vaddr, size);
 139 }
 140
 141 #endif /* _ASM_CACHEFLUSH_H */