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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <arch/mm/page.h>
  30. #include <genarch/mm/page_pt.h>
  31. #include <arch/mm/frame.h>
  32. #include <mm/page.h>
  33. #include <mm/frame.h>
  34. #include <mm/as.h>
  35. #include <arch/interrupt.h>
  36. #include <arch/asm.h>
  37. #include <config.h>
  38. #include <memstr.h>
  39. #include <interrupt.h>
  40. #include <print.h>
  41. #include <panic.h>
  42. #include <align.h>
  43.  
  44. /* Definitions for identity page mapper */
  45. pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));
  46. pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));
  47. pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));
  48. extern pte_t ptl_0; /* From boot.S */
  49.  
  50. #define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
  51. #define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
  52. #define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))
  53.  
  54. #define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))
  55. #define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))
  56. #define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))
  57.  
  58. #define SETUP_PTL1(ptl0, page, tgt)  {  \
  59.     SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
  60.         SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
  61.     }
  62. #define SETUP_PTL2(ptl1, page, tgt)  {  \
  63.     SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
  64.         SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
  65.     }
  66. #define SETUP_PTL3(ptl2, page, tgt)  {  \
  67.     SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
  68.         SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
  69.     }
  70. #define SETUP_FRAME(ptl3, page, tgt)  { \
  71.     SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \
  72.         SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \
  73.     }
  74. void page_arch_init(void)
  75. {
  76.     __address cur;
  77.     int i;
  78.     int identity_flags = PAGE_CACHEABLE | PAGE_EXEC | PAGE_GLOBAL;
  79.  
  80.     if (config.cpu_active == 1) {
  81.         page_mapping_operations = &pt_mapping_operations;
  82.        
  83.         /*
  84.          * PA2KA(identity) mapping for all frames.
  85.          */
  86.         for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  87.             /* Standard identity mapping */
  88.             page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
  89.         }
  90.         /* Upper kernel mapping
  91.          * - from zero to top of kernel (include bottom addresses
  92.          *   because some are needed for init )
  93.          */
  94.         for (cur = PA2KA_CODE(0); cur < config.base+config.kernel_size; cur += FRAME_SIZE) {
  95.             page_mapping_insert(AS_KERNEL, cur, KA2PA(cur), identity_flags);
  96.         }
  97.         for (i=0; i < init.cnt; i++) {
  98.             for (cur=init.tasks[i].addr;cur < init.tasks[i].size; cur += FRAME_SIZE) {
  99.                 page_mapping_insert(AS_KERNEL, PA2KA_CODE(KA2PA(cur)), KA2PA(cur), identity_flags);
  100.             }
  101.         }
  102.  
  103.         exc_register(14, "page_fault", (iroutine)page_fault);
  104.         write_cr3((__address) AS_KERNEL->page_table);
  105.     }
  106.     else {
  107.         write_cr3((__address) AS_KERNEL->page_table);
  108.     }
  109. }
  110.  
  111. /** Identity page mapper
  112.  *
  113.  * We need to map whole physical memory identically before the page subsystem
  114.  * is initializaed. This thing clears page table and fills in the specific
  115.  * items.
  116.  */
  117. void ident_page_fault(int n, istate_t *istate)
  118. {
  119.     __address page;
  120.     static __address oldpage = 0;
  121.     pte_t *aptl_1, *aptl_2, *aptl_3;
  122.  
  123.     page = read_cr2();
  124.     if (oldpage) {
  125.         /* Unmap old address */
  126.         aptl_1 = PTL1_ADDR(&ptl_0, oldpage);
  127.         aptl_2 = PTL2_ADDR(aptl_1, oldpage);
  128.         aptl_3 = PTL3_ADDR(aptl_2, oldpage);
  129.  
  130.         SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
  131.         if (KA2PA(aptl_3) == KA2PA(helper_ptl3))
  132.             SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
  133.         if (KA2PA(aptl_2) == KA2PA(helper_ptl2))
  134.             SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
  135.         if (KA2PA(aptl_1) == KA2PA(helper_ptl1))
  136.             SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);
  137.     }
  138.     if (PTL1_PRESENT(&ptl_0, page))
  139.         aptl_1 = PTL1_ADDR(&ptl_0, page);
  140.     else {
  141.         SETUP_PTL1(&ptl_0, page, helper_ptl1);
  142.         aptl_1 = helper_ptl1;
  143.     }
  144.        
  145.     if (PTL2_PRESENT(aptl_1, page))
  146.         aptl_2 = PTL2_ADDR(aptl_1, page);
  147.     else {
  148.         SETUP_PTL2(aptl_1, page, helper_ptl2);
  149.         aptl_2 = helper_ptl2;
  150.     }
  151.  
  152.     if (PTL3_PRESENT(aptl_2, page))
  153.         aptl_3 = PTL3_ADDR(aptl_2, page);
  154.     else {
  155.         SETUP_PTL3(aptl_2, page, helper_ptl3);
  156.         aptl_3 = helper_ptl3;
  157.     }
  158.    
  159.     SETUP_FRAME(aptl_3, page, page);
  160.  
  161.     oldpage = page;
  162. }
  163.  
  164. void page_fault(int n, istate_t *istate)
  165. {
  166.     __address page;
  167.    
  168.     page = read_cr2();
  169.     if (!as_page_fault(page)) {
  170.         print_info_errcode(n, istate);
  171.         printf("Page fault address: %Q\n", page);
  172.         panic("page fault\n");
  173.     }
  174. }
  175.