include/asm-alpha/page.h

   1 #ifndef _ALPHA_PAGE_H
   2 #define _ALPHA_PAGE_H
   3
   4 #include <asm/pal.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7 #define PAGE_SHIFT      13
   8 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
   9 #define PAGE_MASK       (~(PAGE_SIZE-1))
  10
  11 #ifdef __KERNEL__
  12
  13 #ifndef __ASSEMBLY__
  14
  15 #define STRICT_MM_TYPECHECKS
  16
  17 extern void clear_page(void *page);
  18 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  19
  20 extern void copy_page(void * _to, void * _from);
  21 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  22
  23 #ifdef STRICT_MM_TYPECHECKS
  24 /*
  25  * These are used to make use of C type-checking..
  26  */
  27 typedef struct { unsigned long pte; } pte_t;
  28 typedef struct { unsigned long pmd; } pmd_t;
  29 typedef struct { unsigned long pgd; } pgd_t;
  30 typedef struct { unsigned long pgprot; } pgprot_t;
  31
  32 #define pte_val(x)      ((x).pte)
  33 #define pmd_val(x)      ((x).pmd)
  34 #define pgd_val(x)      ((x).pgd)
  35 #define pgprot_val(x)   ((x).pgprot)
  36
  37 #define __pte(x)        ((pte_t) { (x) } )
  38 #define __pmd(x)        ((pmd_t) { (x) } )
  39 #define __pgd(x)        ((pgd_t) { (x) } )
  40 #define __pgprot(x)     ((pgprot_t) { (x) } )
  41
  42 #else
  43 /*
  44  * .. while these make it easier on the compiler
  45  */
  46 typedef unsigned long pte_t;
  47 typedef unsigned long pmd_t;
  48 typedef unsigned long pgd_t;
  49 typedef unsigned long pgprot_t;
  50
  51 #define pte_val(x)      (x)
  52 #define pmd_val(x)      (x)
  53 #define pgd_val(x)      (x)
  54 #define pgprot_val(x)   (x)
  55
  56 #define __pte(x)        (x)
  57 #define __pgd(x)        (x)
  58 #define __pgprot(x)     (x)
  59
  60 #endif /* STRICT_MM_TYPECHECKS */
  61
  62 /* Pure 2^n version of get_order */
  63 extern __inline__ int get_order(unsigned long size)
  64 {
  65         int order;
  66
  67         size = (size-1) >> (PAGE_SHIFT-1);
  68         order = -1;
  69         do {
  70                 size >>= 1;
  71                 order++;
  72         } while (size);
  73         return order;
  74 }
  75
  76 #endif /* !__ASSEMBLY__ */
  77
  78 /* to align the pointer to the (next) page boundary */
  79 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  80
  81 #ifdef USE_48_BIT_KSEG
  82 #define PAGE_OFFSET             0xffff800000000000
  83 #else
  84 #define PAGE_OFFSET             0xfffffc0000000000
  85 #endif
  86
  87 #define __pa(x)                 ((unsigned long) (x) - PAGE_OFFSET)
  88 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
  89 #ifndef CONFIG_DISCONTIGMEM
  90 #define pfn_to_page(pfn)        (mem_map + (pfn))
  91 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
  92 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  93
  94 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  95 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  96 #endif /* CONFIG_DISCONTIGMEM */
  97
  98 #define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE | VM_EXEC | \
  99                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 100
 101 #endif /* __KERNEL__ */
 102
 103 #endif /* _ALPHA_PAGE_H */