i386/linux-2.3.21/include/asm-mips/page.h

   1 /* $Id: page.h,v 1.6 1999/01/04 16:09:24 ralf Exp $
   2  *
   3  * Definitions for page handling
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * Copyright (C) 1994 - 1998 by Ralf Baechle
  10  */
  11 #ifndef __ASM_MIPS_PAGE_H
  12 #define __ASM_MIPS_PAGE_H
  13
  14 /* PAGE_SHIFT determines the page size */
  15 #define PAGE_SHIFT      12
  16 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  17 #define PAGE_MASK       (~(PAGE_SIZE-1))
  18
  19 #ifdef __KERNEL__
  20
  21 #define STRICT_MM_TYPECHECKS
  22
  23 #ifndef _LANGUAGE_ASSEMBLY
  24
  25 extern void (*clear_page)(unsigned long page);
  26 extern void (*copy_page)(unsigned long to, unsigned long from);
  27
  28 #ifdef STRICT_MM_TYPECHECKS
  29 /*
  30  * These are used to make use of C type-checking..
  31  */
  32 typedef struct { unsigned long pte; } pte_t;
  33 typedef struct { unsigned long pmd; } pmd_t;
  34 typedef struct { unsigned long pgd; } pgd_t;
  35 typedef struct { unsigned long pgprot; } pgprot_t;
  36
  37 #define pte_val(x)      ((x).pte)
  38 #define pmd_val(x)      ((x).pmd)
  39 #define pgd_val(x)      ((x).pgd)
  40 #define pgprot_val(x)   ((x).pgprot)
  41
  42 #define __pte(x)        ((pte_t) { (x) } )
  43 #define __pme(x)        ((pme_t) { (x) } )
  44 #define __pgd(x)        ((pgd_t) { (x) } )
  45 #define __pgprot(x)     ((pgprot_t) { (x) } )
  46
  47 #else /* !defined (STRICT_MM_TYPECHECKS) */
  48 /*
  49  * .. while these make it easier on the compiler
  50  */
  51 typedef unsigned long pte_t;
  52 typedef unsigned long pmd_t;
  53 typedef unsigned long pgd_t;
  54 typedef unsigned long pgprot_t;
  55
  56 #define pte_val(x)      (x)
  57 #define pmd_val(x)      (x)
  58 #define pgd_val(x)      (x)
  59 #define pgprot_val(x)   (x)
  60
  61 #define __pte(x)        (x)
  62 #define __pmd(x)        (x)
  63 #define __pgd(x)        (x)
  64 #define __pgprot(x)     (x)
  65
  66 #endif /* !defined (STRICT_MM_TYPECHECKS) */
  67
  68 #endif /* _LANGUAGE_ASSEMBLY */
  69
  70 /* to align the pointer to the (next) page boundary */
  71 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  72
  73 /*
  74  * This handles the memory map.
  75  * We handle pages at KSEG0 for kernels with 32 bit address space.
  76  */
  77 #define PAGE_OFFSET     0x80000000UL
  78 #define __pa(x)         ((unsigned long) (x) - PAGE_OFFSET)
  79 #define __va(x)         ((void *)((unsigned long) (x) + PAGE_OFFSET))
  80 #define MAP_NR(addr)    (__pa(addr) >> PAGE_SHIFT)
  81
  82 #endif /* defined (__KERNEL__) */
  83
  84 #endif /* __ASM_MIPS_PAGE_H */