arch/sh/mm/pg-sh4.c

   1 /*
   2  * $Id: pg-sh4.c,v 1.1.2.2 2002/11/17 17:56:18 lethal Exp $
   3  *
   4  *  arch/sh/mm/pg-sh4.c
   5  *
   6  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
   7  * Copyright (C) 2002  Paul Mundt
   8  *
   9  * Released under the terms of the GNU GPL v2.0.
  10  */
  11 #include <linux/config.h>
  12 #include <linux/init.h>
  13 #include <linux/mman.h>
  14 #include <linux/mm.h>
  15 #include <linux/threads.h>
  16 #include <asm/addrspace.h>
  17 #include <asm/page.h>
  18 #include <asm/pgtable.h>
  19 #include <asm/processor.h>
  20 #include <asm/cache.h>
  21 #include <asm/io.h>
  22 #include <asm/uaccess.h>
  23 #include <asm/pgalloc.h>
  24 #include <asm/mmu_context.h>
  25 #include <asm/cacheflush.h>
  26
  27 extern struct semaphore p3map_sem[];
  28
  29 /*
  30  * clear_user_page
  31  * @to: P1 address
  32  * @address: U0 address to be mapped
  33  * @page: page (virt_to_page(to))
  34  */
  35 void clear_user_page(void *to, unsigned long address, struct page *page)
  36 {
  37         __set_bit(PG_mapped, &page->flags);
  38         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
  39                 clear_page(to);
  40         else {
  41                 pgprot_t pgprot = __pgprot(_PAGE_PRESENT |
  42                                            _PAGE_RW | _PAGE_CACHABLE |
  43                                            _PAGE_DIRTY | _PAGE_ACCESSED |
  44                                            _PAGE_HW_SHARED | _PAGE_FLAGS_HARD);
  45                 unsigned long phys_addr = PHYSADDR(to);
  46                 unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS);
  47                 pgd_t *dir = pgd_offset_k(p3_addr);
  48                 pmd_t *pmd = pmd_offset(dir, p3_addr);
  49                 pte_t *pte = pte_offset_kernel(pmd, p3_addr);
  50                 pte_t entry;
  51                 unsigned long flags;
  52
  53                 entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot);
  54                 down(&p3map_sem[(address & CACHE_ALIAS)>>12]);
  55                 set_pte(pte, entry);
  56                 local_irq_save(flags);
  57                 __flush_tlb_page(get_asid(), p3_addr);
  58                 local_irq_restore(flags);
  59                 update_mmu_cache(NULL, p3_addr, entry);
  60                 __clear_user_page((void *)p3_addr, to);
  61                 pte_clear(pte);
  62                 up(&p3map_sem[(address & CACHE_ALIAS)>>12]);
  63         }
  64 }
  65
  66 /*
  67  * copy_user_page
  68  * @to: P1 address
  69  * @from: P1 address
  70  * @address: U0 address to be mapped
  71  * @page: page (virt_to_page(to))
  72  */
  73 void copy_user_page(void *to, void *from, unsigned long address,
  74                     struct page *page)
  75 {
  76         __set_bit(PG_mapped, &page->flags);
  77         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
  78                 copy_page(to, from);
  79         else {
  80                 pgprot_t pgprot = __pgprot(_PAGE_PRESENT |
  81                                            _PAGE_RW | _PAGE_CACHABLE |
  82                                            _PAGE_DIRTY | _PAGE_ACCESSED |
  83                                            _PAGE_HW_SHARED | _PAGE_FLAGS_HARD);
  84                 unsigned long phys_addr = PHYSADDR(to);
  85                 unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS);
  86                 pgd_t *dir = pgd_offset_k(p3_addr);
  87                 pmd_t *pmd = pmd_offset(dir, p3_addr);
  88                 pte_t *pte = pte_offset_kernel(pmd, p3_addr);
  89                 pte_t entry;
  90                 unsigned long flags;
  91
  92                 entry = pfn_pte(phys_addr >> PAGE_SHIFT, pgprot);
  93                 down(&p3map_sem[(address & CACHE_ALIAS)>>12]);
  94                 set_pte(pte, entry);
  95                 local_irq_save(flags);
  96                 __flush_tlb_page(get_asid(), p3_addr);
  97                 local_irq_restore(flags);
  98                 update_mmu_cache(NULL, p3_addr, entry);
  99                 __copy_user_page((void *)p3_addr, from, to);
 100                 pte_clear(pte);
 101                 up(&p3map_sem[(address & CACHE_ALIAS)>>12]);
 102         }
 103 }