root/arch/microblaze/include/asm/cacheflush.h

INCLUDED FROM

DEFINITIONS

1. copy_to_user_page
2. copy_from_user_page

   1 /*
   2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3  * Copyright (C) 2007-2009 PetaLogix
   4  * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
   5  * based on v850 version which was
   6  * Copyright (C) 2001,02,03 NEC Electronics Corporation
   7  * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General
  10  * Public License. See the file COPYING in the main directory of this
  11  * archive for more details.
  12  *
  13  */
  14 
  15 #ifndef _ASM_MICROBLAZE_CACHEFLUSH_H
  16 #define _ASM_MICROBLAZE_CACHEFLUSH_H
  17 
  18 /* Somebody depends on this; sigh... */
  19 #include <linux/mm.h>
  20 #include <linux/io.h>
  21 
  22 /* Look at Documentation/core-api/cachetlb.rst */
  23 
  24 /*
  25  * Cache handling functions.
  26  * Microblaze has a write-through data cache, meaning that the data cache
  27  * never needs to be flushed.  The only flushing operations that are
  28  * implemented are to invalidate the instruction cache.  These are called
  29  * after loading a user application into memory, we must invalidate the
  30  * instruction cache to make sure we don't fetch old, bad code.
  31  */
  32 
  33 /* struct cache, d=dcache, i=icache, fl = flush, iv = invalidate,
  34  * suffix r = range */
  35 struct scache {
  36         /* icache */
  37         void (*ie)(void); /* enable */
  38         void (*id)(void); /* disable */
  39         void (*ifl)(void); /* flush */
  40         void (*iflr)(unsigned long a, unsigned long b);
  41         void (*iin)(void); /* invalidate */
  42         void (*iinr)(unsigned long a, unsigned long b);
  43         /* dcache */
  44         void (*de)(void); /* enable */
  45         void (*dd)(void); /* disable */
  46         void (*dfl)(void); /* flush */
  47         void (*dflr)(unsigned long a, unsigned long b);
  48         void (*din)(void); /* invalidate */
  49         void (*dinr)(unsigned long a, unsigned long b);
  50 };
  51 
  52 /* microblaze cache */
  53 extern struct scache *mbc;
  54 
  55 void microblaze_cache_init(void);
  56 
  57 #define enable_icache()                                 mbc->ie();
  58 #define disable_icache()                                mbc->id();
  59 #define flush_icache()                                  mbc->ifl();
  60 #define flush_icache_range(start, end)                  mbc->iflr(start, end);
  61 #define invalidate_icache()                             mbc->iin();
  62 #define invalidate_icache_range(start, end)             mbc->iinr(start, end);
  63 
  64 #define flush_icache_user_range(vma, pg, adr, len)      flush_icache();
  65 #define flush_icache_page(vma, pg)                      do { } while (0)
  66 
  67 #define enable_dcache()                                 mbc->de();
  68 #define disable_dcache()                                mbc->dd();
  69 /* FIXME for LL-temac driver */
  70 #define invalidate_dcache()                             mbc->din();
  71 #define invalidate_dcache_range(start, end)             mbc->dinr(start, end);
  72 #define flush_dcache()                                  mbc->dfl();
  73 #define flush_dcache_range(start, end)                  mbc->dflr(start, end);
  74 
  75 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
  76 /* MS: We have to implement it because of rootfs-jffs2 issue on WB */
  77 #define flush_dcache_page(page) \
  78 do { \
  79         unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
  80         addr = (u32)virt_to_phys((void *)addr); \
  81         flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
  82 } while (0);
  83 
  84 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
  85 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
  86 
  87 #define flush_cache_dup_mm(mm)                          do { } while (0)
  88 #define flush_cache_vmap(start, end)                    do { } while (0)
  89 #define flush_cache_vunmap(start, end)                  do { } while (0)
  90 #define flush_cache_mm(mm)                      do { } while (0)
  91 
  92 #define flush_cache_page(vma, vmaddr, pfn) \
  93         flush_dcache_range(pfn << PAGE_SHIFT, (pfn << PAGE_SHIFT) + PAGE_SIZE);
  94 
  95 /* MS: kgdb code use this macro, wrong len with FLASH */
  96 #if 0
  97 #define flush_cache_range(vma, start, len)      {       \
  98         flush_icache_range((unsigned) (start), (unsigned) (start) + (len)); \
  99         flush_dcache_range((unsigned) (start), (unsigned) (start) + (len)); \
 100 }
 101 #endif
 102 
 103 #define flush_cache_range(vma, start, len) do { } while (0)
 104 
 105 static inline void copy_to_user_page(struct vm_area_struct *vma,
 106                                      struct page *page, unsigned long vaddr,
 107                                      void *dst, void *src, int len)
 108 {
 109         u32 addr = virt_to_phys(dst);
 110         memcpy(dst, src, len);
 111         if (vma->vm_flags & VM_EXEC) {
 112                 invalidate_icache_range(addr, addr + PAGE_SIZE);
 113                 flush_dcache_range(addr, addr + PAGE_SIZE);
 114         }
 115 }
 116 
 117 static inline void copy_from_user_page(struct vm_area_struct *vma,
 118                                        struct page *page, unsigned long vaddr,
 119                                        void *dst, void *src, int len)
 120 {
 121         memcpy(dst, src, len);
 122 }
 123 
 124 #endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */