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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/as_ht.h>
  30. #include <genarch/mm/page_ht.h>
  31. #include <mm/as.h>
  32. #include <mm/frame.h>
  33. #include <arch/types.h>
  34. #include <typedefs.h>
  35. #include <memstr.h>
  36.  
  37. static pte_t *ht_create(int flags);
  38.  
  39. as_operations_t as_ht_operations = {
  40.     .page_table_create = ht_create
  41. };
  42.  
  43.  
  44. /** Page hash table create.
  45.  *
  46.  * The page hash table will be created only once
  47.  * and will be shared by all address spaces.
  48.  *
  49.  * @param flags Ignored.
  50.  *
  51.  * @return Address of global page hash table.
  52.  */
  53. pte_t *ht_create(int flags)
  54. {
  55.     if (!page_ht) {
  56.         page_ht = (pte_t *) frame_alloc(FRAME_KA | FRAME_PANIC, HT_WIDTH - FRAME_WIDTH, NULL);
  57.         memsetb((__address) page_ht, HT_SIZE, 0);
  58.     }
  59.     return page_ht;
  60. }
  61.