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 typedef unsigned long pteval_t;
  23
  24 #undef STRICT_MM_TYPECHECKS
  25
  26 #ifdef STRICT_MM_TYPECHECKS
  27 /*
  28  * These are used to make use of C type-checking..
  29  */
  30 typedef struct { pteval_t pte; } pte_t;
  31 typedef struct { unsigned long pmd; } pmd_t;
  32 typedef struct { unsigned long pgd[2]; } pgd_t;
  33 typedef struct { unsigned long pgprot; } pgprot_t;
  34
  35 #define pte_val(x)      ((x).pte)
  36 #define pmd_val(x)      ((x).pmd)
  37 #define pgd_val(x)      ((x).pgd[0])
  38 #define pgprot_val(x)   ((x).pgprot)
  39
  40 #define __pte(x)        ((pte_t) { (x) } )
  41 #define __pmd(x)        ((pmd_t) { (x) } )
  42 #define __pgprot(x)     ((pgprot_t) { (x) } )
  43
  44 #else
  45 /*
  46  * .. while these make it easier on the compiler
  47  */
  48 typedef pteval_t pte_t;
  49 typedef unsigned long pmd_t;
  50 typedef unsigned long pgd_t[2];
  51 typedef unsigned long pgprot_t;
  52
  53 #define pte_val(x)      (x)
  54 #define pmd_val(x)      (x)
  55 #define pgd_val(x)      ((x)[0])
  56 #define pgprot_val(x)   (x)
  57
  58 #define __pte(x)        (x)
  59 #define __pmd(x)        (x)
  60 #define __pgprot(x)     (x)
  61
  62 #endif /* STRICT_MM_TYPECHECKS */
  63
  64 #endif  /* _ASM_PGTABLE_2LEVEL_TYPES_H */