arch/cris/include/asm/page.h

   1 #ifndef _CRIS_PAGE_H
   2 #define _CRIS_PAGE_H
   3
   4 #include <arch/page.h>
   5 #include <linux/const.h>
   6
   7 /* PAGE_SHIFT determines the page size */
   8 #define PAGE_SHIFT      13
   9 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  10 #define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  13 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  14
  15 #define clear_user_page(page, vaddr, pg)    clear_page(page)
  16 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
  17
  18 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  19         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  20 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  21
  22 /*
  23  * These are used to make use of C type-checking..
  24  */
  25 #ifndef __ASSEMBLY__
  26 typedef struct { unsigned long pte; } pte_t;
  27 typedef struct { unsigned long pgd; } pgd_t;
  28 typedef struct { unsigned long pgprot; } pgprot_t;
  29 typedef struct page *pgtable_t;
  30 #endif
  31
  32 #define pte_val(x)      ((x).pte)
  33 #define pgd_val(x)      ((x).pgd)
  34 #define pgprot_val(x)   ((x).pgprot)
  35
  36 #define __pte(x)        ((pte_t) { (x) } )
  37 #define __pgd(x)        ((pgd_t) { (x) } )
  38 #define __pgprot(x)     ((pgprot_t) { (x) } )
  39
  40 /* On CRIS the PFN numbers doesn't start at 0 so we have to compensate */
  41 /* for that before indexing into the page table starting at mem_map    */
  42 #define ARCH_PFN_OFFSET         (PAGE_OFFSET >> PAGE_SHIFT)
  43 #define pfn_valid(pfn)          (((pfn) - (PAGE_OFFSET >> PAGE_SHIFT)) < max_mapnr)
  44
  45 /* to index into the page map. our pages all start at physical addr PAGE_OFFSET so
  46  * we can let the map start there. notice that we subtract PAGE_OFFSET because
  47  * we start our mem_map there - in other ports they map mem_map physically and
  48  * use __pa instead. in our system both the physical and virtual address of DRAM
  49  * is too high to let mem_map start at 0, so we do it this way instead (similar
  50  * to arm and m68k I think)
  51  */
  52
  53 #define virt_to_page(kaddr)    (mem_map + (((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT))
  54 #define virt_addr_valid(kaddr)  pfn_valid((unsigned)(kaddr) >> PAGE_SHIFT)
  55
  56 /* convert a page (based on mem_map and forward) to a physical address
  57  * do this by figuring out the virtual address and then use __pa
  58  */
  59
  60 #define page_to_phys(page)     __pa((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  61
  62 #ifndef __ASSEMBLY__
  63
  64 #endif /* __ASSEMBLY__ */
  65
  66 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  67                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  68
  69 #include <asm-generic/memory_model.h>
  70 #include <asm-generic/getorder.h>
  71
  72 #endif /* _CRIS_PAGE_H */
  73