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   1 /*-
   2  * Copyright (c) 2008, Kohsuke Ohtani
   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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 
  30 #ifndef _X86_MMU_H
  31 #define _X86_MMU_H
  32 
  33 #include <sys/types.h>
  34 
  35 typedef uint32_t        *pgd_t;         /* page directory */
  36 typedef uint32_t        *pte_t;         /* page table entry */
  37 
  38 /*
  39  * Page directory entry
  40  */
  41 #define PDE_PRESENT     0x00000001
  42 #define PDE_WRITE       0x00000002
  43 #define PDE_USER        0x00000004
  44 #define PDE_WTHRU       0x00000008
  45 #define PDE_NCACHE      0x00000010
  46 #define PDE_ACCESS      0x00000020
  47 #define PDE_SIZE        0x00000080
  48 #define PDE_AVAIL       0x00000e00
  49 #define PDE_ADDRESS     0xfffff000
  50 
  51 /*
  52  * Page table entry
  53  */
  54 #define PTE_PRESENT     0x00000001
  55 #define PTE_WRITE       0x00000002
  56 #define PTE_USER        0x00000004
  57 #define PTE_WTHRU       0x00000008
  58 #define PTE_NCACHE      0x00000010
  59 #define PTE_ACCESS      0x00000020
  60 #define PTE_DIRTY       0x00000040
  61 #define PTE_AVAIL       0x00000e00
  62 #define PTE_ADDRESS     0xfffff000
  63 
  64 /*
  65  *  Virtual and physical address translation
  66  */
  67 #define PAGE_DIR(virt)      (int)((((vaddr_t)(virt)) >> 22) & 0x3ff)
  68 #define PAGE_TABLE(virt)    (int)((((vaddr_t)(virt)) >> 12) & 0x3ff)
  69 
  70 #define pte_present(pgd, virt)  (pgd[PAGE_DIR(virt)] & PDE_PRESENT)
  71 
  72 #define page_present(pte, virt) (pte[PAGE_TABLE(virt)] & PTE_PRESENT)
  73 
  74 #define vtopte(pgd, virt) \
  75             (pte_t)ptokv(((uint32_t *)pgd)[PAGE_DIR(virt)] & PDE_ADDRESS)
  76 
  77 #define ptetopg(pte, virt) \
  78             ((pte)[PAGE_TABLE(virt)] & PTE_ADDRESS)
  79 
  80 #endif /* !_X86_MMU_H */
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