LXR linux/include/asm-cris/page.h

   1#ifndef _CRIS_PAGE_H
   2#define _CRIS_PAGE_H
   3
   4#ifdef __KERNEL__
   5
   6#include <asm/arch/page.h>
   7#include <linux/const.h>
   8
   9/* PAGE_SHIFT determines the page size */
  10#define PAGE_SHIFT      13
  11#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  12#define PAGE_MASK       (~(PAGE_SIZE-1))
  13
  14#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  15#define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  16
  17#define clear_user_page(page, vaddr, pg)    clear_page(page)
  18#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
  19
  20#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  21        alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  22#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  23
  24/*
  25 * These are used to make use of C type-checking..
  26 */
  27#ifndef __ASSEMBLY__
  28typedef struct { unsigned long pte; } pte_t;
  29typedef struct { unsigned long pgd; } pgd_t;
  30typedef struct { unsigned long pgprot; } pgprot_t;
  31#endif
  32
  33#define pte_val(x)      ((x).pte)
  34#define pgd_val(x)      ((x).pgd)
  35#define pgprot_val(x)   ((x).pgprot)
  36
  37#define __pte(x)        ((pte_t) { (x) } )
  38#define __pgd(x)        ((pgd_t) { (x) } )
  39#define __pgprot(x)     ((pgprot_t) { (x) } )
  40
  41/* On CRIS the PFN numbers doesn't start at 0 so we have to compensate */
  42/* for that before indexing into the page table starting at mem_map    */
  43#define ARCH_PFN_OFFSET         (PAGE_OFFSET >> PAGE_SHIFT)
  44#define pfn_valid(pfn)          (((pfn) - (PAGE_OFFSET >> PAGE_SHIFT)) < max_mapnr)
  45
  46/* to index into the page map. our pages all start at physical addr PAGE_OFFSET so
  47 * we can let the map start there. notice that we subtract PAGE_OFFSET because
  48 * we start our mem_map there - in other ports they map mem_map physically and
  49 * use __pa instead. in our system both the physical and virtual address of DRAM
  50 * is too high to let mem_map start at 0, so we do it this way instead (similar
  51 * to arm and m68k I think)
  52 */ 
  53
  54#define virt_to_page(kaddr)    (mem_map + (((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT))
  55#define VALID_PAGE(page)       (((page) - mem_map) < max_mapnr)
  56#define virt_addr_valid(kaddr)  pfn_valid((unsigned)(kaddr) >> PAGE_SHIFT)
  57
  58/* convert a page (based on mem_map and forward) to a physical address
  59 * do this by figuring out the virtual address and then use __pa
  60 */
  61
  62#define page_to_phys(page)     __pa((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  63
  64/* to align the pointer to the (next) page boundary */
  65#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  66
  67#ifndef __ASSEMBLY__
  68
  69#endif /* __ASSEMBLY__ */
  70
  71#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  72                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  73
  74#include <asm-generic/memory_model.h>
  75#include <asm-generic/page.h>
  76
  77#endif /* __KERNEL__ */
  78
  79#endif /* _CRIS_PAGE_H */
  80
  81