release/src-rt-6.x/linux/linux-2.6/include/asm-blackfin/pgtable.h

   1 #ifndef _BLACKFIN_PGTABLE_H
   2 #define _BLACKFIN_PGTABLE_H
   3
   4 #include <asm-generic/4level-fixup.h>
   5
   6 #include <asm/page.h>
   7 #include <asm/cplb.h>
   8
   9 typedef pte_t *pte_addr_t;
  10 /*
  11 * Trivial page table functions.
  12 */
  13 #define pgd_present(pgd)        (1)
  14 #define pgd_none(pgd)           (0)
  15 #define pgd_bad(pgd)            (0)
  16 #define pgd_clear(pgdp)
  17 #define kern_addr_valid(addr)   (1)
  18
  19 #define pmd_offset(a, b)        ((void *)0)
  20 #define pmd_none(x)             (!pmd_val(x))
  21 #define pmd_present(x)          (pmd_val(x))
  22 #define pmd_clear(xp)           do { set_pmd(xp, __pmd(0)); } while (0)
  23 #define pmd_bad(x)              (pmd_val(x) & ~PAGE_MASK)
  24
  25 #define kern_addr_valid(addr) (1)
  26
  27 #define PAGE_NONE               __pgprot(0)     /* these mean nothing to NO_MM */
  28 #define PAGE_SHARED             __pgprot(0)     /* these mean nothing to NO_MM */
  29 #define PAGE_COPY               __pgprot(0)     /* these mean nothing to NO_MM */
  30 #define PAGE_READONLY           __pgprot(0)     /* these mean nothing to NO_MM */
  31 #define PAGE_KERNEL             __pgprot(0)     /* these mean nothing to NO_MM */
  32
  33 extern void paging_init(void);
  34
  35 #define __swp_type(x)           (0)
  36 #define __swp_offset(x)         (0)
  37 #define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  38 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  39 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  40
  41 static inline int pte_file(pte_t pte)
  42 {
  43         return 0;
  44 }
  45
  46 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  47 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
  48
  49 /*
  50  * Page assess control based on Blackfin CPLB management
  51  */
  52 #define _PAGE_RD        (CPLB_USER_RD)
  53 #define _PAGE_WR        (CPLB_USER_WR)
  54 #define _PAGE_USER      (CPLB_USER_RD | CPLB_USER_WR)
  55 #define _PAGE_ACCESSED  CPLB_ALL_ACCESS
  56 #define _PAGE_DIRTY     (CPLB_DIRTY)
  57
  58 #define PTE_BIT_FUNC(fn, op) \
  59         static inline pte_t pte_##fn(pte_t _pte) { _pte.pte op; return _pte; }
  60
  61 PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD);
  62 PTE_BIT_FUNC(mkread, |= _PAGE_RD);
  63 PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR);
  64 PTE_BIT_FUNC(mkwrite, |= _PAGE_WR);
  65 PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER);
  66 PTE_BIT_FUNC(mkexec, |= _PAGE_USER);
  67 PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY);
  68 PTE_BIT_FUNC(mkdirty, |= _PAGE_DIRTY);
  69 PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED);
  70 PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);
  71
  72 /*
  73  * ZERO_PAGE is a global shared page that is always zero: used
  74  * for zero-mapped memory areas etc..
  75  */
  76 #define ZERO_PAGE(vaddr)        (virt_to_page(0))
  77
  78 extern unsigned int kobjsize(const void *objp);
  79
  80 #define swapper_pg_dir ((pgd_t *) 0)
  81 /*
  82  * No page table caches to initialise.
  83  */
  84 #define pgtable_cache_init()    do { } while (0)
  85 #define io_remap_pfn_range      remap_pfn_range
  86
  87 /*
  88  * All 32bit addresses are effectively valid for vmalloc...
  89  * Sort of meaningless for non-VM targets.
  90  */
  91 #define VMALLOC_START   0
  92 #define VMALLOC_END     0xffffffff
  93
  94 #include <asm-generic/pgtable.h>
  95
  96 #endif                          /* _BLACKFIN_PGTABLE_H */