LXR linux/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 */
  32extern void (*flush_cache_all)(void);
  33extern void (*__flush_cache_all)(void);
  34extern void (*flush_cache_mm)(struct mm_struct *mm);
  35#define flush_cache_dup_mm(mm)  do { (void) (mm); } while (0)
  36extern void (*flush_cache_range)(struct vm_area_struct *vma,
  37        unsigned long start, unsigned long end);
  38extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
  39extern void __flush_dcache_page(struct page *page);
  40
  41#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
  42static 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
  53extern void __flush_anon_page(struct page *, unsigned long);
  54static 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
  61static inline void flush_icache_page(struct vm_area_struct *vma,
  62        struct page *page)
  63{
  64}
  65
  66extern void (*flush_icache_range)(unsigned long start, unsigned long end);
  67extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
  68
  69extern void (*__flush_cache_vmap)(void);
  70
  71static inline void flush_cache_vmap(unsigned long start, unsigned long end)
  72{
  73        if (cpu_has_dc_aliases)
  74                __flush_cache_vmap();
  75}
  76
  77extern void (*__flush_cache_vunmap)(void);
  78
  79static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
  80{
  81        if (cpu_has_dc_aliases)
  82                __flush_cache_vunmap();
  83}
  84
  85extern 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
  89extern 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
  93extern void (*flush_cache_sigtramp)(unsigned long addr);
  94extern void (*flush_icache_all)(void);
  95extern void (*local_flush_data_cache_page)(void * addr);
  96extern 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. */
 112unsigned long run_uncached(void *func);
 113
 114extern void *kmap_coherent(struct page *page, unsigned long addr);
 115extern void kunmap_coherent(void);
 116
 117#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
 118static 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 */
 127extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
 128
 129static 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
 135static 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 */
 142