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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_ht.h>
  30. #include <mm/page.h>
  31. #include <mm/frame.h>
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <arch/asm.h>
  35.  
  36. static void ht_mapping_insert(__address page, __address frame, int flags, __address root);
  37. static pte_t *ht_mapping_find(__address page, __address root);
  38.  
  39. page_operations_t page_ht_operations = {
  40.     .mapping_insert = ht_mapping_insert,
  41.     .mapping_find = ht_mapping_find
  42. };
  43.  
  44. /** Map page to frame using page hash table.
  45.  *
  46.  * Map virtual address 'page' to physical address 'frame'
  47.  * using 'flags'.
  48.  *
  49.  * @param page Virtual address of the page to be mapped.
  50.  * @param frame Physical address of memory frame to which the mapping is done.
  51.  * @param flags Flags to be used for mapping.
  52.  * @param root Explicit PTL0 address.
  53.  */
  54. void ht_mapping_insert(__address page, __address frame, int flags, __address root)
  55. {
  56. }
  57.  
  58. /** Find mapping for virtual page in page hash table.
  59.  *
  60.  * Find mapping for virtual page.
  61.  *
  62.  * @param page Virtual page.
  63.  * @param root PTL0 address if non-zero.
  64.  *
  65.  * @return NULL if there is no such mapping; entry from PTL3 describing the mapping otherwise.
  66.  */
  67. pte_t *ht_mapping_find(__address page, __address root)
  68. {
  69.     return NULL;
  70. }
  71.