include/asm-alpha/page.h

   1 #ifndef _ALPHA_PAGE_H
   2 #define _ALPHA_PAGE_H
   3
   4 #include <linux/config.h>
   5 #include <asm/pal.h>
   6
   7 /* PAGE_SHIFT determines the page size */
   8 #define PAGE_SHIFT      13
   9 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  10 #define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12 #ifdef __KERNEL__
  13
  14 #ifndef __ASSEMBLY__
  15
  16 #define STRICT_MM_TYPECHECKS
  17
  18 extern void clear_page(void *page);
  19 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  20
  21 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vmaddr)
  22 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  23
  24 extern void copy_page(void * _to, void * _from);
  25 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  26
  27 #ifdef STRICT_MM_TYPECHECKS
  28 /*
  29  * These are used to make use of C type-checking..
  30  */
  31 typedef struct { unsigned long pte; } pte_t;
  32 typedef struct { unsigned long pmd; } pmd_t;
  33 typedef struct { unsigned long pgd; } pgd_t;
  34 typedef struct { unsigned long pgprot; } pgprot_t;
  35
  36 #define pte_val(x)      ((x).pte)
  37 #define pmd_val(x)      ((x).pmd)
  38 #define pgd_val(x)      ((x).pgd)
  39 #define pgprot_val(x)   ((x).pgprot)
  40
  41 #define __pte(x)        ((pte_t) { (x) } )
  42 #define __pmd(x)        ((pmd_t) { (x) } )
  43 #define __pgd(x)        ((pgd_t) { (x) } )
  44 #define __pgprot(x)     ((pgprot_t) { (x) } )
  45
  46 #else
  47 /*
  48  * .. while these make it easier on the compiler
  49  */
  50 typedef unsigned long pte_t;
  51 typedef unsigned long pmd_t;
  52 typedef unsigned long pgd_t;
  53 typedef unsigned long pgprot_t;
  54
  55 #define pte_val(x)      (x)
  56 #define pmd_val(x)      (x)
  57 #define pgd_val(x)      (x)
  58 #define pgprot_val(x)   (x)
  59
  60 #define __pte(x)        (x)
  61 #define __pgd(x)        (x)
  62 #define __pgprot(x)     (x)
  63
  64 #endif /* STRICT_MM_TYPECHECKS */
  65
  66 /* Pure 2^n version of get_order */
  67 extern __inline__ int get_order(unsigned long size)
  68 {
  69         int order;
  70
  71         size = (size-1) >> (PAGE_SHIFT-1);
  72         order = -1;
  73         do {
  74                 size >>= 1;
  75                 order++;
  76         } while (size);
  77         return order;
  78 }
  79
  80 #ifdef USE_48_BIT_KSEG
  81 #define PAGE_OFFSET             0xffff800000000000UL
  82 #else
  83 #define PAGE_OFFSET             0xfffffc0000000000UL
  84 #endif
  85
  86 #else
  87
  88 #ifdef USE_48_BIT_KSEG
  89 #define PAGE_OFFSET             0xffff800000000000
  90 #else
  91 #define PAGE_OFFSET             0xfffffc0000000000
  92 #endif
  93
  94 #endif /* !__ASSEMBLY__ */
  95
  96 /* to align the pointer to the (next) page boundary */
  97 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  98
  99 #define __pa(x)                 ((unsigned long) (x) - PAGE_OFFSET)
 100 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 101 #ifndef CONFIG_DISCONTIGMEM
 102 #define pfn_to_page(pfn)        (mem_map + (pfn))
 103 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 104 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 105
 106 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 107 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 108 #endif /* CONFIG_DISCONTIGMEM */
 109
 110 #define VM_DATA_DEFAULT_FLAGS           (VM_READ | VM_WRITE | VM_EXEC | \
 111                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 112
 113 #endif /* __KERNEL__ */
 114
 115 #endif /* _ALPHA_PAGE_H */