include/asm-cris/page.h

   1 #ifndef _CRIS_PAGE_H
   2 #define _CRIS_PAGE_H
   3
   4 #include <linux/config.h>
   5 #include <asm/arch/page.h>
   6
   7 /* PAGE_SHIFT determines the page size */
   8 #define PAGE_SHIFT      13
   9 #ifndef __ASSEMBLY__
  10 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  11 #else
  12 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  13 #endif
  14 #define PAGE_MASK       (~(PAGE_SIZE-1))
  15
  16 #ifdef __KERNEL__
  17
  18 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  19 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  20
  21 #define clear_user_page(page, vaddr, pg)    clear_page(page)
  22 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
  23
  24 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
  25 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  26
  27 /*
  28  * These are used to make use of C type-checking..
  29  */
  30 #ifndef __ASSEMBLY__
  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 #endif
  36
  37 #define pte_val(x)      ((x).pte)
  38 #define pmd_val(x)      ((x).pmd)
  39 #define pgd_val(x)      ((x).pgd)
  40 #define pgprot_val(x)   ((x).pgprot)
  41
  42 #define __pte(x)        ((pte_t) { (x) } )
  43 #define __pmd(x)        ((pmd_t) { (x) } )
  44 #define __pgd(x)        ((pgd_t) { (x) } )
  45 #define __pgprot(x)     ((pgprot_t) { (x) } )
  46
  47 /* On CRIS the PFN numbers doesn't start at 0 so we have to compensate */
  48 /* for that before indexing into the page table starting at mem_map    */
  49 #define pfn_to_page(pfn)        (mem_map + ((pfn) - (PAGE_OFFSET >> PAGE_SHIFT)))
  50 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + (PAGE_OFFSET >> PAGE_SHIFT))
  51 #define pfn_valid(pfn)          (((pfn) - (PAGE_OFFSET >> PAGE_SHIFT)) < max_mapnr)
  52
  53 /* to index into the page map. our pages all start at physical addr PAGE_OFFSET so
  54  * we can let the map start there. notice that we subtract PAGE_OFFSET because
  55  * we start our mem_map there - in other ports they map mem_map physically and
  56  * use __pa instead. in our system both the physical and virtual address of DRAM
  57  * is too high to let mem_map start at 0, so we do it this way instead (similar
  58  * to arm and m68k I think)
  59  */
  60
  61 #define virt_to_page(kaddr)    (mem_map + (((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT))
  62 #define VALID_PAGE(page)       (((page) - mem_map) < max_mapnr)
  63 #define virt_addr_valid(kaddr)  pfn_valid((unsigned)(kaddr) >> PAGE_SHIFT)
  64
  65 /* convert a page (based on mem_map and forward) to a physical address
  66  * do this by figuring out the virtual address and then use __pa
  67  */
  68
  69 #define page_to_phys(page)     __pa((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  70
  71 /* to align the pointer to the (next) page boundary */
  72 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  73
  74 #ifndef __ASSEMBLY__
  75
  76 #define BUG() do { \
  77   printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
  78 } while (0)
  79
  80 /* Pure 2^n version of get_order */
  81 static inline int get_order(unsigned long size)
  82 {
  83         int order;
  84
  85         size = (size-1) >> (PAGE_SHIFT-1);
  86         order = -1;
  87         do {
  88                 size >>= 1;
  89                 order++;
  90         } while (size);
  91         return order;
  92 }
  93 #endif /* __ASSEMBLY__ */
  94
  95 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  96                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  97
  98 #endif /* __KERNEL__ */
  99
 100 #endif /* _CRIS_PAGE_H */
 101