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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. #ifndef __ia32_PAGE_H__
  30. #define __ia32_PAGE_H__
  31.  
  32. #include <arch/types.h>
  33. #include <arch/mm/frame.h>
  34.  
  35. #define PAGE_SIZE   FRAME_SIZE
  36.  
  37. #define KA2PA(x)    ((x) - 0x80000000)
  38. #define PA2KA(x)    ((x) + 0x80000000)
  39.  
  40. /*
  41.  * Implementation of generic 4-level page table interface.
  42.  * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out.
  43.  */
  44. #define PTL0_INDEX_ARCH(vaddr)  (((vaddr)>>22)&0x3ff)
  45. #define PTL1_INDEX_ARCH(vaddr)  0
  46. #define PTL2_INDEX_ARCH(vaddr)  0
  47. #define PTL3_INDEX_ARCH(vaddr)  (((vaddr)>>12)&0x3ff)
  48.  
  49. #define GET_PTL1_ADDRESS_ARCH(ptl0, i)      ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address)<<12))
  50. #define GET_PTL2_ADDRESS_ARCH(ptl1, i)      (ptl1)
  51. #define GET_PTL3_ADDRESS_ARCH(ptl2, i)      (ptl2)
  52. #define GET_FRAME_ADDRESS_ARCH(ptl3, i)     ((__address)((((pte_t *)(ptl3))[(i)].frame_address)<<12))
  53.  
  54.  
  55. struct page_specifier {
  56.     unsigned present : 1;
  57.     unsigned writeable : 1;
  58.     unsigned uaccessible : 1;
  59.     unsigned page_write_through : 1;
  60.     unsigned page_cache_disable : 1;
  61.     unsigned accessed : 1;
  62.     unsigned dirty : 1;
  63.     unsigned : 2;
  64.     unsigned avl : 3;
  65.     unsigned frame_address : 20;
  66. } __attribute__ ((packed));
  67.  
  68. typedef struct page_specifier   pte_t;
  69.  
  70. extern void page_arch_init(void);
  71.  
  72. #endif
  73.