LXR linux/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__
  26typedef struct { unsigned long pte; } pte_t;
  27typedef struct { unsigned long pgd; } pgd_t;
  28typedef struct { unsigned long pgprot; } pgprot_t;
  29typedef 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
  74