include/asm-s390/page.h

   1 /*
   2  *  include/asm-s390/page.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com)
   7  */
   8
   9 #ifndef _S390_PAGE_H
  10 #define _S390_PAGE_H
  11
  12 /* PAGE_SHIFT determines the page size */
  13 #define PAGE_SHIFT      12
  14 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  15 #define PAGE_MASK       (~(PAGE_SIZE-1))
  16
  17 #ifdef __KERNEL__
  18 #ifndef __ASSEMBLY__
  19
  20 #define STRICT_MM_TYPECHECKS
  21
  22 #define BUG() do { \
  23         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
  24         __asm__ __volatile__(".word 0x0000"); \
  25 } while (0)
  26
  27 #define PAGE_BUG(page) do { \
  28         BUG(); \
  29 } while (0)
  30
  31 /* Pure 2^n version of get_order */
  32 extern __inline__ int get_order(unsigned long size)
  33 {
  34         int order;
  35
  36         size = (size-1) >> (PAGE_SHIFT-1);
  37         order = -1;
  38         do {
  39                 size >>= 1;
  40                 order++;
  41         } while (size);
  42         return order;
  43 }
  44
  45 /*
  46  * gcc uses builtin, i.e. MVCLE for both operations
  47  */
  48
  49 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  50 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  51
  52 #ifdef STRICT_MM_TYPECHECKS
  53 /*
  54  * These are used to make use of C type-checking..
  55  */
  56 typedef struct { unsigned long pte; } pte_t;
  57 typedef struct { unsigned long pmd; } pmd_t;
  58 typedef struct {
  59         unsigned long pgd0;
  60         unsigned long pgd1;
  61         unsigned long pgd2;
  62         unsigned long pgd3;
  63         } pgd_t;
  64 typedef struct { unsigned long pgprot; } pgprot_t;
  65
  66 #define pte_val(x)      ((x).pte)
  67 #define pmd_val(x)      ((x).pmd)
  68 #define pgd_val(x)      ((x).pgd0)
  69 #define pgprot_val(x)   ((x).pgprot)
  70
  71 #define __pte(x)        ((pte_t) { (x) } )
  72 #define __pmd(x)        ((pmd_t) { (x) } )
  73 #define __pgd(x)        ((pgd_t) { (x) } )
  74 #define __pgprot(x)     ((pgprot_t) { (x) } )
  75
  76 #else
  77 /*
  78  * .. while these make it easier on the compiler
  79  */
  80 typedef unsigned long pte_t;
  81 typedef unsigned long pmd_t;
  82 typedef struct {
  83         unsigned long pgd0;
  84         unsigned long pgd1;
  85         unsigned long pgd2;
  86         unsigned long pgd3;
  87         } pgd_t;
  88 typedef unsigned long pgprot_t;
  89
  90 #define pte_val(x)      (x)
  91 #define pmd_val(x)      (x)
  92 #define pgd_val(x)      (x)
  93 #define pgprot_val(x)   (x)
  94
  95 #define __pte(x)        (x)
  96 #define __pmd(x)        (x)
  97 #define __pgd(x)        (x)
  98 #define __pgprot(x)     (x)
  99
 100 #endif
 101 #endif                                 /* !__ASSEMBLY__                    */
 102
 103 /* to align the pointer to the (next) page boundary */
 104 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 105
 106 /*
 107  *
 108  *
 109  */
 110
 111 #define __PAGE_OFFSET           (0x0)
 112 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 113 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 114 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 115 #define virt_to_page(kaddr)     (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
 116 #define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
 117
 118 #endif                                 /* __KERNEL__                       */
 119
 120 #endif                                 /* _S390_PAGE_H                     */