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  1. /*
  2.  * Copyright (C) 2006 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 <genarch/mm/page_pt.h>
  30. #include <mm/page.h>
  31. #include <mm/frame.h>
  32. #include <mm/as.h>
  33. #include <arch/mm/page.h>
  34. #include <arch/mm/as.h>
  35. #include <arch/types.h>
  36. #include <typedefs.h>
  37. #include <arch/asm.h>
  38. #include <memstr.h>
  39.  
  40. static void pt_mapping_insert(as_t *as, __address page, __address frame, int flags);
  41. static pte_t *pt_mapping_find(as_t *as, __address page);
  42.  
  43. page_operations_t page_pt_operations = {
  44.     .mapping_insert = pt_mapping_insert,
  45.     .mapping_find = pt_mapping_find
  46. };
  47.  
  48. /** Map page to frame using hierarchical page tables.
  49.  *
  50.  * Map virtual address 'page' to physical address 'frame'
  51.  * using 'flags'.
  52.  *
  53.  * The address space must be locked and interrupts must be disabled.
  54.  *
  55.  * @param as Address space to wich page belongs.
  56.  * @param page Virtual address of the page to be mapped.
  57.  * @param frame Physical address of memory frame to which the mapping is done.
  58.  * @param flags Flags to be used for mapping.
  59.  */
  60. void pt_mapping_insert(as_t *as, __address page, __address frame, int flags)
  61. {
  62.     pte_t *ptl0, *ptl1, *ptl2, *ptl3;
  63.     __address newpt;
  64.  
  65.     ptl0 = (pte_t *) PA2KA((__address) as->page_table);
  66.  
  67.     if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
  68.         newpt = frame_alloc(FRAME_KA, ONE_FRAME, NULL);
  69.         memsetb(newpt, PAGE_SIZE, 0);
  70.         SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
  71.         SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
  72.     }
  73.  
  74.     ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
  75.  
  76.     if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
  77.         newpt = frame_alloc(FRAME_KA, ONE_FRAME, NULL);
  78.         memsetb(newpt, PAGE_SIZE, 0);
  79.         SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
  80.         SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
  81.     }
  82.  
  83.     ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
  84.  
  85.     if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
  86.         newpt = frame_alloc(FRAME_KA, ONE_FRAME, NULL);
  87.         memsetb(newpt, PAGE_SIZE, 0);
  88.         SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
  89.         SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
  90.     }
  91.  
  92.     ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
  93.  
  94.     SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(page), frame);
  95.     SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags);
  96. }
  97.  
  98. /** Find mapping for virtual page in hierarchical page tables.
  99.  *
  100.  * Find mapping for virtual page.
  101.  *
  102.  * The address space must be locked and interrupts must be disabled.
  103.  *
  104.  * @param as Address space to which page belongs.
  105.  * @param page Virtual page.
  106.  *
  107.  * @return NULL if there is no such mapping; entry from PTL3 describing the mapping otherwise.
  108.  */
  109. pte_t *pt_mapping_find(as_t *as, __address page)
  110. {
  111.     pte_t *ptl0, *ptl1, *ptl2, *ptl3;
  112.  
  113.     ptl0 = (pte_t *) PA2KA((__address) as->page_table);
  114.  
  115.     if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT)
  116.         return NULL;
  117.  
  118.     ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
  119.  
  120.     if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT)
  121.         return NULL;
  122.  
  123.     ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
  124.  
  125.     if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT)
  126.         return NULL;
  127.  
  128.     ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
  129.  
  130.     return &ptl3[PTL3_INDEX(page)];
  131. }
  132.