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   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  */
  12
  13 #include <linux/init.h>
  14 #include <linux/mman.h>
  15 #include <linux/mm.h>
  16 #include <linux/threads.h>
  17 #include <linux/fs.h>
  18 #include <asm/addrspace.h>
  19 #include <asm/page.h>
  20 #include <asm/pgtable.h>
  21 #include <asm/processor.h>
  22 #include <asm/cache.h>
  23 #include <asm/io.h>
  24 #include <asm/uaccess.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/mmu_context.h>
  27 #include <asm/cacheflush.h>
  28
  29 static inline void __flush_purge_virtual_region(void *p1, void *virt, int size)
  30 {
  31         unsigned long v;
  32         unsigned long begin, end;
  33         unsigned long p1_begin;
  34
  35
  36         begin = L1_CACHE_ALIGN((unsigned long)virt);
  37         end = L1_CACHE_ALIGN((unsigned long)virt + size);
  38
  39         p1_begin = (unsigned long)p1 & ~(L1_CACHE_BYTES - 1);
  40
  41         /* do this the slow way as we may not have TLB entries
  42          * for virt yet. */
  43         for (v = begin; v < end; v += L1_CACHE_BYTES) {
  44                 unsigned long p;
  45                 unsigned long ways, addr;
  46
  47                 p = __pa(p1_begin);
  48
  49                 ways = current_cpu_data.dcache.ways;
  50                 addr = CACHE_OC_ADDRESS_ARRAY;
  51
  52                 do {
  53                         unsigned long data;
  54
  55                         addr |= (v & current_cpu_data.dcache.entry_mask);
  56
  57                         data = ctrl_inl(addr);
  58                         if ((data & CACHE_PHYSADDR_MASK) ==
  59                                (p & CACHE_PHYSADDR_MASK)) {
  60                                 data &= ~(SH_CACHE_UPDATED|SH_CACHE_VALID);
  61                                 ctrl_outl(data, addr);
  62                         }
  63
  64                         addr += current_cpu_data.dcache.way_incr;
  65                 } while (--ways);
  66
  67                 p1_begin += L1_CACHE_BYTES;
  68         }
  69 }
  70
  71 /*
  72  * clear_user_page
  73  * @to: P1 address
  74  * @address: U0 address to be mapped
  75  */
  76 void clear_user_page(void *to, unsigned long address, struct page *pg)
  77 {
  78         struct page *page = virt_to_page(to);
  79
  80         __set_bit(PG_mapped, &page->flags);
  81         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
  82                 clear_page(to);
  83                 __flush_wback_region(to, PAGE_SIZE);
  84         } else {
  85                 __flush_purge_virtual_region(to,
  86                                              (void *)(address & 0xfffff000),
  87                                              PAGE_SIZE);
  88                 clear_page(to);
  89                 __flush_wback_region(to, PAGE_SIZE);
  90         }
  91 }
  92
  93 /*
  94  * copy_user_page
  95  * @to: P1 address
  96  * @from: P1 address
  97  * @address: U0 address to be mapped
  98  */
  99 void copy_user_page(void *to, void *from, unsigned long address, struct page *pg)
 100 {
 101         struct page *page = virt_to_page(to);
 102
 103
 104         __set_bit(PG_mapped, &page->flags);
 105         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
 106                 copy_page(to, from);
 107                 __flush_wback_region(to, PAGE_SIZE);
 108         } else {
 109                 __flush_purge_virtual_region(to,
 110                                              (void *)(address & 0xfffff000),
 111                                              PAGE_SIZE);
 112                 copy_page(to, from);
 113                 __flush_wback_region(to, PAGE_SIZE);
 114         }
 115 }
 116
 117 /*
 118  * For SH7705, we have our own implementation for ptep_get_and_clear
 119  * Copied from pg-sh4.c
 120  */
 121 pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 122 {
 123         pte_t pte = *ptep;
 124
 125         pte_clear(mm, addr, ptep);
 126         if (!pte_not_present(pte)) {
 127                 unsigned long pfn = pte_pfn(pte);
 128                 if (pfn_valid(pfn)) {
 129                         struct page *page = pfn_to_page(pfn);
 130                         struct address_space *mapping = page_mapping(page);
 131                         if (!mapping || !mapping_writably_mapped(mapping))
 132                                 __clear_bit(PG_mapped, &page->flags);
 133                 }
 134         }
 135
 136         return pte;
 137 }
 138