root/include/asm-ppc/page.h

/* */

INCLUDED FROM

   1 #ifndef _PPC_PAGE_H
   2 #define _PPC_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 void invalidate(void);
  10 
  11 #ifdef __KERNEL__
  12 
  13 #define STRICT_MM_TYPECHECKS
  14 
  15 #ifdef STRICT_MM_TYPECHECKS
  16 /*
  17  * These are used to make use of C type-checking..
  18  */
  19 typedef struct { unsigned long pte; } pte_t;
  20 typedef struct { unsigned long pmd; } pmd_t;
  21 typedef struct { unsigned long pgd; } pgd_t;
  22 typedef struct { unsigned long pgprot; } pgprot_t;
  23 
  24 #define pte_val(x)      ((x).pte)
  25 #define pmd_val(x)      ((x).pmd)
  26 #define pgd_val(x)      ((x).pgd)
  27 #define pgprot_val(x)   ((x).pgprot)
  28 
  29 #define __pte(x)        ((pte_t) { (x) } )
  30 #define __pmd(x)        ((pmd_t) { (x) } )
  31 #define __pgd(x)        ((pgd_t) { (x) } )
  32 #define __pgprot(x)     ((pgprot_t) { (x) } )
  33 
  34 #else
  35 /*
  36  * .. while these make it easier on the compiler
  37  */
  38 typedef unsigned long pte_t;
  39 typedef unsigned long pmd_t;
  40 typedef unsigned long pgd_t;
  41 typedef unsigned long pgprot_t;
  42 
  43 #define pte_val(x)      (x)
  44 #define pmd_val(x)      (x)
  45 #define pgd_val(x)      (x)
  46 #define pgprot_val(x)   (x)
  47 
  48 #define __pte(x)        (x)
  49 #define __pmd(x)        (x)
  50 #define __pgd(x)        (x)
  51 #define __pgprot(x)     (x)
  52 
  53 #endif
  54 
  55 /* to align the pointer to the (next) page boundary */
  56 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  57 
  58 /* This handles the memory map.. */
  59 
  60 #define KERNELBASE      0x90000000
  61 #define PAGE_OFFSET     KERNELBASE
  62 #define MAP_NR(addr)    ((((unsigned long)addr) - PAGE_OFFSET) >> PAGE_SHIFT)
  63 #define MAP_PAGE_RESERVED       (1<<15)
  64 
  65 
  66 /*
  67  * This used to be an unsigned short...
  68  * 
  69  *                         -- Cort
  70  */
  71 /*typedef unsigned short mem_map_t;*/
  72 
  73 typedef struct {
  74         unsigned count:30,
  75                  dirty:1,
  76                  reserved:1;
  77 } mem_map_t;
  78 
  79 /* Certain architectures need to do special things when pte's
  80  * within a page table are directly modified.  Thus, the following
  81  * hook is made available.
  82  */
  83 #define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
  84 
  85 
  86 #endif /* __KERNEL__ */
  87 
  88 #endif /* _PPC_PAGE_H */

/* */