arch/unicore32/include/asm/cacheflush.h

   1 /*
   2  * linux/arch/unicore32/include/asm/cacheflush.h
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #ifndef __UNICORE_CACHEFLUSH_H__
  13 #define __UNICORE_CACHEFLUSH_H__
  14
  15 #include <linux/mm.h>
  16
  17 #include <asm/shmparam.h>
  18
  19 #define CACHE_COLOUR(vaddr)     ((vaddr & (SHMLBA - 1)) >> PAGE_SHIFT)
  20
  21 /*
  22  * This flag is used to indicate that the page pointed to by a pte is clean
  23  * and does not require cleaning before returning it to the user.
  24  */
  25 #define PG_dcache_clean PG_arch_1
  26
  27 /*
  28  *      MM Cache Management
  29  *      ===================
  30  *
  31  *      The arch/unicore32/mm/cache.S files implement these methods.
  32  *
  33  *      Start addresses are inclusive and end addresses are exclusive;
  34  *      start addresses should be rounded down, end addresses up.
  35  *
  36  *      See Documentation/core-api/cachetlb.rst for more information.
  37  *      Please note that the implementation of these, and the required
  38  *      effects are cache-type (VIVT/VIPT/PIPT) specific.
  39  *
  40  *      flush_icache_all()
  41  *
  42  *              Unconditionally clean and invalidate the entire icache.
  43  *              Currently only needed for cache-v6.S and cache-v7.S, see
  44  *              __flush_icache_all for the generic implementation.
  45  *
  46  *      flush_kern_all()
  47  *
  48  *              Unconditionally clean and invalidate the entire cache.
  49  *
  50  *      flush_user_all()
  51  *
  52  *              Clean and invalidate all user space cache entries
  53  *              before a change of page tables.
  54  *
  55  *      flush_user_range(start, end, flags)
  56  *
  57  *              Clean and invalidate a range of cache entries in the
  58  *              specified address space before a change of page tables.
  59  *              - start - user start address (inclusive, page aligned)
  60  *              - end   - user end address   (exclusive, page aligned)
  61  *              - flags - vma->vm_flags field
  62  *
  63  *      coherent_kern_range(start, end)
  64  *
  65  *              Ensure coherency between the Icache and the Dcache in the
  66  *              region described by start, end.  If you have non-snooping
  67  *              Harvard caches, you need to implement this function.
  68  *              - start  - virtual start address
  69  *              - end    - virtual end address
  70  *
  71  *      coherent_user_range(start, end)
  72  *
  73  *              Ensure coherency between the Icache and the Dcache in the
  74  *              region described by start, end.  If you have non-snooping
  75  *              Harvard caches, you need to implement this function.
  76  *              - start  - virtual start address
  77  *              - end    - virtual end address
  78  *
  79  *      flush_kern_dcache_area(kaddr, size)
  80  *
  81  *              Ensure that the data held in page is written back.
  82  *              - kaddr  - page address
  83  *              - size   - region size
  84  *
  85  *      DMA Cache Coherency
  86  *      ===================
  87  *
  88  *      dma_flush_range(start, end)
  89  *
  90  *              Clean and invalidate the specified virtual address range.
  91  *              - start  - virtual start address
  92  *              - end    - virtual end address
  93  */
  94
  95 extern void __cpuc_flush_icache_all(void);
  96 extern void __cpuc_flush_kern_all(void);
  97 extern void __cpuc_flush_user_all(void);
  98 extern void __cpuc_flush_user_range(unsigned long, unsigned long, unsigned int);
  99 extern void __cpuc_coherent_kern_range(unsigned long, unsigned long);
 100 extern void __cpuc_coherent_user_range(unsigned long, unsigned long);
 101 extern void __cpuc_flush_dcache_area(void *, size_t);
 102 extern void __cpuc_flush_kern_dcache_area(void *addr, size_t size);
 103
 104 /*
 105  * Copy user data from/to a page which is mapped into a different
 106  * processes address space.  Really, we want to allow our "user
 107  * space" model to handle this.
 108  */
 109 extern void copy_to_user_page(struct vm_area_struct *, struct page *,
 110         unsigned long, void *, const void *, unsigned long);
 111 #define copy_from_user_page(vma, page, vaddr, dst, src, len)    \
 112         do {                                                    \
 113                 memcpy(dst, src, len);                          \
 114         } while (0)
 115
 116 /*
 117  * Convert calls to our calling convention.
 118  */
 119 /* Invalidate I-cache */
 120 static inline void __flush_icache_all(void)
 121 {
 122         asm("movc       p0.c5, %0, #20;\n"
 123             "nop; nop; nop; nop; nop; nop; nop; nop\n"
 124             :
 125             : "r" (0));
 126 }
 127
 128 #define flush_cache_all()               __cpuc_flush_kern_all()
 129
 130 extern void flush_cache_mm(struct mm_struct *mm);
 131 extern void flush_cache_range(struct vm_area_struct *vma,
 132                 unsigned long start, unsigned long end);
 133 extern void flush_cache_page(struct vm_area_struct *vma,
 134                 unsigned long user_addr, unsigned long pfn);
 135
 136 #define flush_cache_dup_mm(mm) flush_cache_mm(mm)
 137
 138 /*
 139  * flush_cache_user_range is used when we want to ensure that the
 140  * Harvard caches are synchronised for the user space address range.
 141  * This is used for the UniCore private sys_cacheflush system call.
 142  */
 143 #define flush_cache_user_range(vma, start, end) \
 144         __cpuc_coherent_user_range((start) & PAGE_MASK, PAGE_ALIGN(end))
 145
 146 /*
 147  * Perform necessary cache operations to ensure that data previously
 148  * stored within this range of addresses can be executed by the CPU.
 149  */
 150 #define flush_icache_range(s, e)        __cpuc_coherent_kern_range(s, e)
 151
 152 /*
 153  * Perform necessary cache operations to ensure that the TLB will
 154  * see data written in the specified area.
 155  */
 156 #define clean_dcache_area(start, size)  cpu_dcache_clean_area(start, size)
 157
 158 /*
 159  * flush_dcache_page is used when the kernel has written to the page
 160  * cache page at virtual address page->virtual.
 161  *
 162  * If this page isn't mapped (ie, page_mapping == NULL), or it might
 163  * have userspace mappings, then we _must_ always clean + invalidate
 164  * the dcache entries associated with the kernel mapping.
 165  *
 166  * Otherwise we can defer the operation, and clean the cache when we are
 167  * about to change to user space.  This is the same method as used on SPARC64.
 168  * See update_mmu_cache for the user space part.
 169  */
 170 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
 171 extern void flush_dcache_page(struct page *);
 172
 173 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
 174 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
 175
 176 #define flush_icache_user_range(vma, page, addr, len)   \
 177         flush_dcache_page(page)
 178
 179 /*
 180  * We don't appear to need to do anything here.  In fact, if we did, we'd
 181  * duplicate cache flushing elsewhere performed by flush_dcache_page().
 182  */
 183 #define flush_icache_page(vma, page)    do { } while (0)
 184
 185 /*
 186  * flush_cache_vmap() is used when creating mappings (eg, via vmap,
 187  * vmalloc, ioremap etc) in kernel space for pages.  On non-VIPT
 188  * caches, since the direct-mappings of these pages may contain cached
 189  * data, we need to do a full cache flush to ensure that writebacks
 190  * don't corrupt data placed into these pages via the new mappings.
 191  */
 192 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
 193 {
 194 }
 195
 196 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
 197 {
 198 }
 199
 200 #endif