include/asm-m68knommu/page.h

   1 #ifndef _M68KNOMMU_PAGE_H
   2 #define _M68KNOMMU_PAGE_H
   3
   4 #include <linux/config.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7
   8 #define PAGE_SHIFT      (12)
   9 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  10 #define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12 #ifdef __KERNEL__
  13
  14 #include <asm/setup.h>
  15
  16 #ifndef __ASSEMBLY__
  17
  18 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  19 #define free_user_page(page, addr)      free_page(addr)
  20
  21 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  22 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  23
  24 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  25 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  26
  27 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
  28 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  29
  30 /*
  31  * These are used to make use of C type-checking..
  32  */
  33 typedef struct { unsigned long pte; } pte_t;
  34 typedef struct { unsigned long pmd[16]; } pmd_t;
  35 typedef struct { unsigned long pgd; } pgd_t;
  36 typedef struct { unsigned long pgprot; } pgprot_t;
  37
  38 #define pte_val(x)      ((x).pte)
  39 #define pmd_val(x)      ((&x)->pmd[0])
  40 #define pgd_val(x)      ((x).pgd)
  41 #define pgprot_val(x)   ((x).pgprot)
  42
  43 #define __pte(x)        ((pte_t) { (x) } )
  44 #define __pmd(x)        ((pmd_t) { (x) } )
  45 #define __pgd(x)        ((pgd_t) { (x) } )
  46 #define __pgprot(x)     ((pgprot_t) { (x) } )
  47
  48 /* to align the pointer to the (next) page boundary */
  49 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  50
  51 /* Pure 2^n version of get_order */
  52 extern __inline__ int get_order(unsigned long size)
  53 {
  54         int order;
  55
  56         size = (size-1) >> (PAGE_SHIFT-1);
  57         order = -1;
  58         do {
  59                 size >>= 1;
  60                 order++;
  61         } while (size);
  62         return order;
  63 }
  64
  65 extern unsigned long memory_start;
  66 extern unsigned long memory_end;
  67
  68 #endif /* !__ASSEMBLY__ */
  69
  70 #include <asm/page_offset.h>
  71
  72 #define PAGE_OFFSET             (PAGE_OFFSET_RAW)
  73
  74 #ifndef __ASSEMBLY__
  75
  76 #define __pa(vaddr)             virt_to_phys((void *)vaddr)
  77 #define __va(paddr)             phys_to_virt((unsigned long)paddr)
  78
  79 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  80 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  81
  82 #define virt_to_page(addr)      (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  83 #define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  84
  85 #define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
  86 #define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
  87
  88 #define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
  89                                 ((void *)(kaddr) < (void *)memory_end))
  90
  91 #endif /* __ASSEMBLY__ */
  92
  93 #endif /* __KERNEL__ */
  94
  95 #endif /* _M68KNOMMU_PAGE_H */