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

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  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 */
 68 

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