i386/linux/linux-2.3.21/arch/arm/mm/mm-armv.c

   1 /*
   2  * arch/arm/mm/mm-armv.c
   3  *
   4  * Common routines for ARM v3 and v4 architectures.
   5  *
   6  * Copyright (C) 1998 Russell King
   7  *
   8  * Do not compile this file directly!
   9  */
  10
  11 #ifndef MAPPING
  12 #error MAPPING not defined - do not compile this file individually
  13 #endif
  14
  15 static const struct mapping {
  16         unsigned long virtual;
  17         unsigned long physical;
  18         unsigned long length;
  19         int domain:4,
  20             prot_read:1,
  21             prot_write:1;
  22 } mapping[] __initdata = {
  23         MAPPING
  24 };
  25
  26 #define SIZEOFMAP (sizeof(mapping) / sizeof(mapping[0]))
  27
  28 unsigned long __init setup_io_pagetables(unsigned long start_mem)
  29 {
  30         const struct mapping *mp;
  31         int i;
  32
  33         for (i = 0, mp = mapping; i < SIZEOFMAP; i++, mp++) {
  34                 unsigned long virtual, physical, length;
  35                 int prot;
  36
  37                 virtual = mp->virtual;
  38                 physical = mp->physical;
  39                 length = mp->length;
  40                 prot = (mp->prot_read ? L_PTE_USER : 0) | (mp->prot_write ? L_PTE_WRITE : 0)
  41                         | L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY;
  42
  43                 while ((virtual & 1048575 || physical & 1048575) && length >= PAGE_SIZE) {
  44                         alloc_init_page(&start_mem, virtual, physical, mp->domain, prot);
  45                         length -= PAGE_SIZE;
  46                         virtual += PAGE_SIZE;
  47                         physical += PAGE_SIZE;
  48                 }
  49
  50                 prot = (mp->prot_read ? PMD_SECT_AP_READ : 0) |
  51                        (mp->prot_write ? PMD_SECT_AP_WRITE : 0);
  52
  53                 while (length >= 1048576) {
  54                         alloc_init_section(&start_mem, virtual, physical, mp->domain, prot);
  55                         length -= 1048576;
  56                         virtual += 1048576;
  57                         physical += 1048576;
  58                 }
  59
  60                 prot = (mp->prot_read ? L_PTE_USER : 0) | (mp->prot_write ? L_PTE_WRITE : 0)
  61                         | L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY;
  62
  63                 while (length >= PAGE_SIZE) {
  64                         alloc_init_page(&start_mem, virtual, physical, mp->domain, prot);
  65                         length -= PAGE_SIZE;
  66                         virtual += PAGE_SIZE;
  67                         physical += PAGE_SIZE;
  68                 }
  69         }
  70
  71         return start_mem;
  72 }