arch/sh/mm/pg-sh7705.c

   1 /*
   2  * arch/sh/mm/pg-sh7705.c
   3  *
   4  * Copyright (C) 1999, 2000  Niibe Yutaka
   5  * Copyright (C) 2004  Alex Song
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11 #include <linux/init.h>
  12 #include <linux/mman.h>
  13 #include <linux/mm.h>
  14 #include <linux/threads.h>
  15 #include <asm/addrspace.h>
  16 #include <asm/page.h>
  17 #include <asm/pgtable.h>
  18 #include <asm/processor.h>
  19 #include <asm/cache.h>
  20 #include <asm/io.h>
  21 #include <asm/uaccess.h>
  22 #include <asm/pgalloc.h>
  23 #include <asm/mmu_context.h>
  24 #include <asm/cacheflush.h>
  25
  26 static inline void __flush_purge_virtual_region(void *p1, void *virt, int size)
  27 {
  28         unsigned long v;
  29         unsigned long begin, end;
  30         unsigned long p1_begin;
  31
  32
  33         begin = L1_CACHE_ALIGN((unsigned long)virt);
  34         end = L1_CACHE_ALIGN((unsigned long)virt + size);
  35
  36         p1_begin = (unsigned long)p1 & ~(L1_CACHE_BYTES - 1);
  37
  38         /* do this the slow way as we may not have TLB entries
  39          * for virt yet. */
  40         for (v = begin; v < end; v += L1_CACHE_BYTES) {
  41                 unsigned long p;
  42                 unsigned long ways, addr;
  43
  44                 p = __pa(p1_begin);
  45
  46                 ways = current_cpu_data.dcache.ways;
  47                 addr = CACHE_OC_ADDRESS_ARRAY;
  48
  49                 do {
  50                         unsigned long data;
  51
  52                         addr |= (v & current_cpu_data.dcache.entry_mask);
  53
  54                         data = ctrl_inl(addr);
  55                         if ((data & CACHE_PHYSADDR_MASK) ==
  56                                (p & CACHE_PHYSADDR_MASK)) {
  57                                 data &= ~(SH_CACHE_UPDATED|SH_CACHE_VALID);
  58                                 ctrl_outl(data, addr);
  59                         }
  60
  61                         addr += current_cpu_data.dcache.way_incr;
  62                 } while (--ways);
  63
  64                 p1_begin += L1_CACHE_BYTES;
  65         }
  66 }
  67
  68 /*
  69  * clear_user_page
  70  * @to: P1 address
  71  * @address: U0 address to be mapped
  72  */
  73 void clear_user_page(void *to, unsigned long address, struct page *pg)
  74 {
  75         struct page *page = virt_to_page(to);
  76
  77         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
  78                 clear_page(to);
  79                 __flush_wback_region(to, PAGE_SIZE);
  80         } else {
  81                 __flush_purge_virtual_region(to,
  82                                              (void *)(address & 0xfffff000),
  83                                              PAGE_SIZE);
  84                 clear_page(to);
  85                 __flush_wback_region(to, PAGE_SIZE);
  86         }
  87 }
  88
  89 /*
  90  * copy_user_page
  91  * @to: P1 address
  92  * @from: P1 address
  93  * @address: U0 address to be mapped
  94  */
  95 void copy_user_page(void *to, void *from, unsigned long address,
  96                     struct page *pg)
  97 {
  98         struct page *page = virt_to_page(to);
  99
 100         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
 101                 copy_page(to, from);
 102                 __flush_wback_region(to, PAGE_SIZE);
 103         } else {
 104                 __flush_purge_virtual_region(to,
 105                                              (void *)(address & 0xfffff000),
 106                                              PAGE_SIZE);
 107                 copy_page(to, from);
 108                 __flush_wback_region(to, PAGE_SIZE);
 109         }
 110 }