LXR linux/arch/blackfin/include/asm/page.h

   1#ifndef _BLACKFIN_PAGE_H
   2#define _BLACKFIN_PAGE_H
   3
   4/* PAGE_SHIFT determines the page size */
   5
   6#define PAGE_SHIFT      12
   7#ifdef __ASSEMBLY__
   8#define PAGE_SIZE       (1 << PAGE_SHIFT)
   9#else
  10#define PAGE_SIZE       (1UL << PAGE_SHIFT)
  11#endif
  12#define PAGE_MASK       (~(PAGE_SIZE-1))
  13
  14#include <asm/setup.h>
  15
  16#ifndef __ASSEMBLY__
  17
  18#define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  19#define free_user_page(page, addr)      free_page(addr)
  20
  21#define clear_page(page)        memset((page), 0, PAGE_SIZE)
  22#define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  23
  24#define clear_user_page(page, vaddr,pg) clear_page(page)
  25#define copy_user_page(to, from, vaddr,pg)      copy_page(to, from)
  26
  27/*
  28 * These are used to make use of C type-checking..
  29 */
  30typedef struct {
  31        unsigned long pte;
  32} pte_t;
  33typedef struct {
  34        unsigned long pmd[16];
  35} pmd_t;
  36typedef struct {
  37        unsigned long pgd;
  38} pgd_t;
  39typedef struct {
  40        unsigned long pgprot;
  41} pgprot_t;
  42typedef struct page *pgtable_t;
  43
  44#define pte_val(x)      ((x).pte)
  45#define pmd_val(x)      ((&x)->pmd[0])
  46#define pgd_val(x)      ((x).pgd)
  47#define pgprot_val(x)   ((x).pgprot)
  48
  49#define __pte(x)        ((pte_t) { (x) } )
  50#define __pmd(x)        ((pmd_t) { (x) } )
  51#define __pgd(x)        ((pgd_t) { (x) } )
  52#define __pgprot(x)     ((pgprot_t) { (x) } )
  53
  54extern unsigned long memory_start;
  55extern unsigned long memory_end;
  56
  57#endif                          /* !__ASSEMBLY__ */
  58
  59#include <asm/page_offset.h>
  60#include <asm/io.h>
  61
  62#define PAGE_OFFSET             (PAGE_OFFSET_RAW)
  63
  64#ifndef __ASSEMBLY__
  65
  66#define __pa(vaddr)             virt_to_phys((void *)(vaddr))
  67#define __va(paddr)             phys_to_virt((unsigned long)(paddr))
  68
  69#define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
  70
  71#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  72#define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  73#define virt_to_page(addr)      (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  74#define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  75#define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
  76
  77#define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
  78#define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
  79#define pfn_valid(pfn)          ((pfn) < max_mapnr)
  80
  81#define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
  82                                ((void *)(kaddr) < (void *)memory_end))
  83
  84#include <asm-generic/page.h>
  85
  86#endif                          /* __ASSEMBLY__ */
  87
  88#endif                          /* _BLACKFIN_PAGE_H */
  89