include/asm-mips/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_page(mm, vmaddr, pfn) flushes a single page
  21  *  - flush_cache_range(vma, start, end) flushes a range of pages
  22  *  - flush_icache_range(start, end) flush a range of instructions
  23  *  - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
  24  *  - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
  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 extern void (*flush_cache_range)(struct vm_area_struct *vma,
  36         unsigned long start, unsigned long end);
  37 extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
  38 extern void __flush_dcache_page(struct page *page);
  39
  40 static inline void flush_dcache_page(struct page *page)
  41 {
  42         if (cpu_has_dc_aliases)
  43                 __flush_dcache_page(page);
  44
  45 }
  46
  47 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
  48 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
  49
  50 extern void (*flush_icache_page)(struct vm_area_struct *vma,
  51         struct page *page);
  52 extern void (*flush_icache_range)(unsigned long start, unsigned long end);
  53 #define flush_cache_vmap(start, end)            flush_cache_all()
  54 #define flush_cache_vunmap(start, end)          flush_cache_all()
  55
  56 #define copy_to_user_page(vma, page, vaddr, dst, src, len)              \
  57 do {                                                                    \
  58         memcpy(dst, (void *) src, len);                                 \
  59         flush_icache_page(vma, page);                                   \
  60 } while (0)
  61 #define copy_from_user_page(vma, page, vaddr, dst, src, len)            \
  62         memcpy(dst, src, len)
  63
  64 extern void (*flush_cache_sigtramp)(unsigned long addr);
  65 extern void (*flush_icache_all)(void);
  66 extern void (*flush_data_cache_page)(unsigned long addr);
  67
  68 /*
  69  * This flag is used to indicate that the page pointed to by a pte
  70  * is dirty and requires cleaning before returning it to the user.
  71  */
  72 #define PG_dcache_dirty                 PG_arch_1
  73
  74 #define Page_dcache_dirty(page)         \
  75         test_bit(PG_dcache_dirty, &(page)->flags)
  76 #define SetPageDcacheDirty(page)        \
  77         set_bit(PG_dcache_dirty, &(page)->flags)
  78 #define ClearPageDcacheDirty(page)      \
  79         clear_bit(PG_dcache_dirty, &(page)->flags)
  80
  81 #endif /* _ASM_CACHEFLUSH_H */