root/include/asm-m68k/page.h

/* */

INCLUDED FROM

   1 #ifndef _M68K_PAGE_H
   2 #define _M68K_PAGE_H
   3 
   4 /* PAGE_SHIFT determines the page size */
   5 #define PAGE_SHIFT      12
   6 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
   7 #define PAGE_MASK       (~(PAGE_SIZE-1))
   8 
   9 #ifdef __KERNEL__
  10 
  11 #define STRICT_MM_TYPECHECKS
  12 
  13 #ifdef STRICT_MM_TYPECHECKS
  14 /*
  15  * These are used to make use of C type-checking..
  16  */
  17 typedef struct { unsigned long pte; } pte_t;
  18 typedef struct { unsigned long pmd[16]; } pmd_t;
  19 typedef struct { unsigned long pgd; } pgd_t;
  20 typedef struct { unsigned long pgprot; } pgprot_t;
  21 
  22 #define pte_val(x)      ((x).pte)
  23 #define pmd_val(x)      ((&x)->pmd[0])
  24 #define pgd_val(x)      ((x).pgd)
  25 #define pgprot_val(x)   ((x).pgprot)
  26 
  27 #define __pte(x)        ((pte_t) { (x) } )
  28 #define __pmd(x)        ((pmd_t) { (x) } )
  29 #define __pgd(x)        ((pgd_t) { (x) } )
  30 #define __pgprot(x)     ((pgprot_t) { (x) } )
  31 
  32 #else
  33 /*
  34  * .. while these make it easier on the compiler
  35  */
  36 typedef unsigned long pte_t;
  37 typedef struct { unsigned long pmd[16]; } pmd_t;
  38 typedef unsigned long pgd_t;
  39 typedef unsigned long pgprot_t;
  40 
  41 #define pte_val(x)      (x)
  42 #define pmd_val(x)      ((&x)->pmd[0])
  43 #define pgd_val(x)      (x)
  44 #define pgprot_val(x)   (x)
  45 
  46 #define __pte(x)        (x)
  47 #define __pmd(x)        ((pmd_t) { (x) } )
  48 #define __pgd(x)        (x)
  49 #define __pgprot(x)     (x)
  50 
  51 #endif
  52 
  53 /* m68k_is040or060 is != 0 for a '040 or higher; used numbers are 4 for 68040
  54  * and 6 for 68060 */
  55 extern int m68k_is040or060;
  56 
  57 /* This is the cache mode to be used for pages containing page descriptors for
  58  * processors >= '040. It is in pte_mknocache(), and the variable is defined
  59  * and initialized in head.S */
  60 extern int m68k_pgtable_cachemode;
  61 
  62 /* to align the pointer to the (next) page boundary */
  63 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  64 
  65 /* This handles the memory map.. */
  66 #define PAGE_OFFSET             0
  67 #define MAP_NR(addr)            (((unsigned long)(addr)) >> PAGE_SHIFT)
  68 #define MAP_PAGE_RESERVED       (1<<15)
  69 
  70 #endif /* __KERNEL__ */
  71 
  72 #endif /* _M68K_PAGE_H */

/* */