arch/arm/include/asm/pgtable-2level-types.h

   1 /*
   2  * arch/arm/include/asm/pgtable-2level-types.h
   3  *
   4  * Copyright (C) 1995-2003 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19 #ifndef _ASM_PGTABLE_2LEVEL_TYPES_H
  20 #define _ASM_PGTABLE_2LEVEL_TYPES_H
  21
  22 #include <asm/types.h>
  23
  24 typedef u32 pteval_t;
  25 typedef u32 pmdval_t;
  26
  27 #undef STRICT_MM_TYPECHECKS
  28
  29 #ifdef STRICT_MM_TYPECHECKS
  30 /*
  31  * These are used to make use of C type-checking..
  32  */
  33 typedef struct { pteval_t pte; } pte_t;
  34 typedef struct { pmdval_t pmd; } pmd_t;
  35 typedef struct { pmdval_t pgd[2]; } pgd_t;
  36 typedef struct { pteval_t pgprot; } pgprot_t;
  37
  38 #define pte_val(x)      ((x).pte)
  39 #define pmd_val(x)      ((x).pmd)
  40 #define pgd_val(x)      ((x).pgd[0])
  41 #define pgprot_val(x)   ((x).pgprot)
  42
  43 #define __pte(x)        ((pte_t) { (x) } )
  44 #define __pmd(x)        ((pmd_t) { (x) } )
  45 #define __pgprot(x)     ((pgprot_t) { (x) } )
  46
  47 #else
  48 /*
  49  * .. while these make it easier on the compiler
  50  */
  51 typedef pteval_t pte_t;
  52 typedef pmdval_t pmd_t;
  53 typedef pmdval_t pgd_t[2];
  54 typedef pteval_t pgprot_t;
  55
  56 #define pte_val(x)      (x)
  57 #define pmd_val(x)      (x)
  58 #define pgd_val(x)      ((x)[0])
  59 #define pgprot_val(x)   (x)
  60
  61 #define __pte(x)        (x)
  62 #define __pmd(x)        (x)
  63 #define __pgprot(x)     (x)
  64
  65 #endif /* STRICT_MM_TYPECHECKS */
  66
  67 #endif  /* _ASM_PGTABLE_2LEVEL_TYPES_H */