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       (4096)
  10 #define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12 #ifdef __KERNEL__
  13
  14 #include <asm/setup.h>
  15
  16 #if !defined(CONFIG_SMALL_TASKS) && PAGE_SHIFT < 13
  17 #define KTHREAD_SIZE (8192)
  18 #else
  19 #define KTHREAD_SIZE PAGE_SIZE
  20 #endif
  21
  22 #ifndef __ASSEMBLY__
  23
  24 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  25 #define free_user_page(page, addr)      free_page(addr)
  26
  27 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  28 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  29
  30 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  31 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  32
  33 /*
  34  * These are used to make use of C type-checking..
  35  */
  36 typedef struct { unsigned long pte; } pte_t;
  37 typedef struct { unsigned long pmd[16]; } pmd_t;
  38 typedef struct { unsigned long pgd; } pgd_t;
  39 typedef struct { unsigned long pgprot; } pgprot_t;
  40
  41 #define pte_val(x)      ((x).pte)
  42 #define pmd_val(x)      ((&x)->pmd[0])
  43 #define pgd_val(x)      ((x).pgd)
  44 #define pgprot_val(x)   ((x).pgprot)
  45
  46 #define __pte(x)        ((pte_t) { (x) } )
  47 #define __pmd(x)        ((pmd_t) { (x) } )
  48 #define __pgd(x)        ((pgd_t) { (x) } )
  49 #define __pgprot(x)     ((pgprot_t) { (x) } )
  50
  51 /* to align the pointer to the (next) page boundary */
  52 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  53
  54 /* Pure 2^n version of get_order */
  55 extern __inline__ int get_order(unsigned long size)
  56 {
  57         int order;
  58
  59         size = (size-1) >> (PAGE_SHIFT-1);
  60         order = -1;
  61         do {
  62                 size >>= 1;
  63                 order++;
  64         } while (size);
  65         return order;
  66 }
  67
  68 extern unsigned long memory_start;
  69 extern unsigned long memory_end;
  70
  71 #endif /* !__ASSEMBLY__ */
  72
  73 #include <asm/page_offset.h>
  74
  75 #define PAGE_OFFSET             (PAGE_OFFSET_RAW)
  76
  77 #ifndef __ASSEMBLY__
  78
  79 #define __pa(vaddr)             virt_to_phys((void *)vaddr)
  80 #define __va(paddr)             phys_to_virt((unsigned long)paddr)
  81
  82 #define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
  83
  84 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  85 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  86
  87 #define virt_to_page(addr)      (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  88 #define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  89 #define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
  90
  91 #define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
  92 #define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
  93
  94 #define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
  95                                 ((void *)(kaddr) < (void *)memory_end))
  96
  97 #endif /* __ASSEMBLY__ */
  98
  99 #endif /* __KERNEL__ */
 100
 101 #endif /* _M68KNOMMU_PAGE_H */