arch/blackfin/include/asm/pgtable.h

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later.
   5  */
   6
   7 #ifndef _BLACKFIN_PGTABLE_H
   8 #define _BLACKFIN_PGTABLE_H
   9
  10 #include <asm-generic/4level-fixup.h>
  11
  12 #include <asm/page.h>
  13 #include <asm/def_LPBlackfin.h>
  14
  15 typedef pte_t *pte_addr_t;
  16 /*
  17 * Trivial page table functions.
  18 */
  19 #define pgd_present(pgd)        (1)
  20 #define pgd_none(pgd)           (0)
  21 #define pgd_bad(pgd)            (0)
  22 #define pgd_clear(pgdp)
  23 #define kern_addr_valid(addr)   (1)
  24
  25 #define pmd_offset(a, b)        ((void *)0)
  26 #define pmd_none(x)             (!pmd_val(x))
  27 #define pmd_present(x)          (pmd_val(x))
  28 #define pmd_clear(xp)           do { set_pmd(xp, __pmd(0)); } while (0)
  29 #define pmd_bad(x)              (pmd_val(x) & ~PAGE_MASK)
  30
  31 #define kern_addr_valid(addr) (1)
  32
  33 #define PAGE_NONE               __pgprot(0)     /* these mean nothing to NO_MM */
  34 #define PAGE_SHARED             __pgprot(0)     /* these mean nothing to NO_MM */
  35 #define PAGE_COPY               __pgprot(0)     /* these mean nothing to NO_MM */
  36 #define PAGE_READONLY           __pgprot(0)     /* these mean nothing to NO_MM */
  37 #define PAGE_KERNEL             __pgprot(0)     /* these mean nothing to NO_MM */
  38 #define pgprot_noncached(prot)  (prot)
  39
  40 extern void paging_init(void);
  41
  42 #define __swp_type(x)           (0)
  43 #define __swp_offset(x)         (0)
  44 #define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  45 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  46 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  47
  48 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  49 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
  50
  51 /*
  52  * Page assess control based on Blackfin CPLB management
  53  */
  54 #define _PAGE_RD        (CPLB_USER_RD)
  55 #define _PAGE_WR        (CPLB_USER_WR)
  56 #define _PAGE_USER      (CPLB_USER_RD | CPLB_USER_WR)
  57 #define _PAGE_ACCESSED  CPLB_ALL_ACCESS
  58 #define _PAGE_DIRTY     (CPLB_DIRTY)
  59
  60 #define PTE_BIT_FUNC(fn, op) \
  61         static inline pte_t pte_##fn(pte_t _pte) { _pte.pte op; return _pte; }
  62
  63 PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD);
  64 PTE_BIT_FUNC(mkread, |= _PAGE_RD);
  65 PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR);
  66 PTE_BIT_FUNC(mkwrite, |= _PAGE_WR);
  67 PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER);
  68 PTE_BIT_FUNC(mkexec, |= _PAGE_USER);
  69 PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY);
  70 PTE_BIT_FUNC(mkdirty, |= _PAGE_DIRTY);
  71 PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED);
  72 PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);
  73
  74 /*
  75  * ZERO_PAGE is a global shared page that is always zero: used
  76  * for zero-mapped memory areas etc..
  77  */
  78 #define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  79 extern char empty_zero_page[];
  80
  81 #define swapper_pg_dir ((pgd_t *) 0)
  82 /*
  83  * No page table caches to initialise.
  84  */
  85 #define pgtable_cache_init()    do { } while (0)
  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 /* provide a special get_unmapped_area for framebuffer mmaps of nommu */
  95 extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
  96                                           unsigned long, unsigned long,
  97                                           unsigned long);
  98 #define HAVE_ARCH_FB_UNMAPPED_AREA
  99
 100 #include <asm-generic/pgtable.h>
 101
 102 #endif                          /* _BLACKFIN_PGTABLE_H */