LXR linux-bk/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/*
  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 pmd; } pmd_t;
  30typedef struct { unsigned long pgd; } pgd_t;
  31typedef struct { unsigned long pgprot; } pgprot_t;
  32#endif
  33
  34#define pte_val(x)      ((x).pte)
  35#define pmd_val(x)      ((x).pmd)
  36#define pgd_val(x)      ((x).pgd)
  37#define pgprot_val(x)   ((x).pgprot)
  38
  39#define __pte(x)        ((pte_t) { (x) } )
  40#define __pmd(x)        ((pmd_t) { (x) } )
  41#define __pgd(x)        ((pgd_t) { (x) } )
  42#define __pgprot(x)     ((pgprot_t) { (x) } )
  43
  44/* On CRIS the PFN numbers doesn't start at 0 so we have to compensate */
  45/* for that before indexing into the page table starting at mem_map    */
  46#define pfn_to_page(pfn)        (mem_map + ((pfn) - (PAGE_OFFSET >> PAGE_SHIFT)))
  47#define page_to_pfn(page)       ((unsigned long)((page) - mem_map) + (PAGE_OFFSET >> PAGE_SHIFT))
  48#define pfn_valid(pfn)          (((pfn) - (PAGE_OFFSET >> PAGE_SHIFT)) < max_mapnr)
  49
  50/* to index into the page map. our pages all start at physical addr PAGE_OFFSET so
  51 * we can let the map start there. notice that we subtract PAGE_OFFSET because
  52 * we start our mem_map there - in other ports they map mem_map physically and
  53 * use __pa instead. in our system both the physical and virtual address of DRAM
  54 * is too high to let mem_map start at 0, so we do it this way instead (similar
  55 * to arm and m68k I think)
  56 */ 
  57
  58#define virt_to_page(kaddr)    (mem_map + (((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT))
  59#define VALID_PAGE(page)       (((page) - mem_map) < max_mapnr)
  60#define virt_addr_valid(kaddr)  pfn_valid((unsigned)(kaddr) >> PAGE_SHIFT)
  61
  62/* convert a page (based on mem_map and forward) to a physical address
  63 * do this by figuring out the virtual address and then use __pa
  64 */
  65
  66#define page_to_phys(page)     __pa((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  67
  68/* to align the pointer to the (next) page boundary */
  69#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  70
  71#ifndef __ASSEMBLY__
  72
  73#define BUG() do { \
  74  printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
  75} while (0)
  76
  77#define PAGE_BUG(page) do { \
  78         BUG(); \
  79} while (0)
  80
  81/* Pure 2^n version of get_order */
  82static inline int get_order(unsigned long size)
  83{
  84        int order;
  85
  86        size = (size-1) >> (PAGE_SHIFT-1);
  87        order = -1;
  88        do {
  89                size >>= 1;
  90                order++;
  91        } while (size);
  92        return order;
  93}
  94#endif /* __ASSEMBLY__ */
  95
  96#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  97                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  98
  99#endif /* __KERNEL__ */
 100
 101#endif /* _CRIS_PAGE_H */
 102
 103