kernel/2.6.29.6-aldebaran-rt/arch/powerpc/include/asm/pgtable-4k.h

   1 #ifndef _ASM_POWERPC_PGTABLE_4K_H
   2 #define _ASM_POWERPC_PGTABLE_4K_H
   3 /*
   4  * Entries per page directory level.  The PTE level must use a 64b record
   5  * for each page table entry.  The PMD and PGD level use a 32b record for
   6  * each entry by assuming that each entry is page aligned.
   7  */
   8 #define PTE_INDEX_SIZE  9
   9 #define PMD_INDEX_SIZE  7
  10 #define PUD_INDEX_SIZE  7
  11 #define PGD_INDEX_SIZE  9
  12
  13 #ifndef __ASSEMBLY__
  14 #define PTE_TABLE_SIZE  (sizeof(pte_t) << PTE_INDEX_SIZE)
  15 #define PMD_TABLE_SIZE  (sizeof(pmd_t) << PMD_INDEX_SIZE)
  16 #define PUD_TABLE_SIZE  (sizeof(pud_t) << PUD_INDEX_SIZE)
  17 #define PGD_TABLE_SIZE  (sizeof(pgd_t) << PGD_INDEX_SIZE)
  18 #endif  /* __ASSEMBLY__ */
  19
  20 #define PTRS_PER_PTE    (1 << PTE_INDEX_SIZE)
  21 #define PTRS_PER_PMD    (1 << PMD_INDEX_SIZE)
  22 #define PTRS_PER_PUD    (1 << PMD_INDEX_SIZE)
  23 #define PTRS_PER_PGD    (1 << PGD_INDEX_SIZE)
  24
  25 /* PMD_SHIFT determines what a second-level page table entry can map */
  26 #define PMD_SHIFT       (PAGE_SHIFT + PTE_INDEX_SIZE)
  27 #define PMD_SIZE        (1UL << PMD_SHIFT)
  28 #define PMD_MASK        (~(PMD_SIZE-1))
  29
  30 /* With 4k base page size, hugepage PTEs go at the PMD level */
  31 #define MIN_HUGEPTE_SHIFT       PMD_SHIFT
  32
  33 /* PUD_SHIFT determines what a third-level page table entry can map */
  34 #define PUD_SHIFT       (PMD_SHIFT + PMD_INDEX_SIZE)
  35 #define PUD_SIZE        (1UL << PUD_SHIFT)
  36 #define PUD_MASK        (~(PUD_SIZE-1))
  37
  38 /* PGDIR_SHIFT determines what a fourth-level page table entry can map */
  39 #define PGDIR_SHIFT     (PUD_SHIFT + PUD_INDEX_SIZE)
  40 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  41 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  42
  43 /* PTE bits */
  44 #define _PAGE_HASHPTE   0x0400 /* software: pte has an associated HPTE */
  45 #define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
  46 #define _PAGE_GROUP_IX  0x7000 /* software: HPTE index within group */
  47 #define _PAGE_F_SECOND  _PAGE_SECONDARY
  48 #define _PAGE_F_GIX     _PAGE_GROUP_IX
  49 #define _PAGE_SPECIAL   0x10000 /* software: special page */
  50 #define __HAVE_ARCH_PTE_SPECIAL
  51
  52 /* PTE flags to conserve for HPTE identification */
  53 #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \
  54                          _PAGE_SECONDARY | _PAGE_GROUP_IX)
  55
  56 /* There is no 4K PFN hack on 4K pages */
  57 #define _PAGE_4K_PFN    0
  58
  59 /* PAGE_MASK gives the right answer below, but only by accident */
  60 /* It should be preserving the high 48 bits and then specifically */
  61 /* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
  62 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \
  63                          _PAGE_HPTEFLAGS | _PAGE_SPECIAL)
  64
  65 /* Bits to mask out from a PMD to get to the PTE page */
  66 #define PMD_MASKED_BITS         0
  67 /* Bits to mask out from a PUD to get to the PMD page */
  68 #define PUD_MASKED_BITS         0
  69 /* Bits to mask out from a PGD to get to the PUD page */
  70 #define PGD_MASKED_BITS         0
  71
  72 /* shift to put page number into pte */
  73 #define PTE_RPN_SHIFT   (17)
  74
  75 #ifdef STRICT_MM_TYPECHECKS
  76 #define __real_pte(e,p)         ((real_pte_t){(e)})
  77 #define __rpte_to_pte(r)        ((r).pte)
  78 #else
  79 #define __real_pte(e,p)         (e)
  80 #define __rpte_to_pte(r)        (__pte(r))
  81 #endif
  82 #define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> 12)
  83
  84 #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift)       \
  85         do {                                                             \
  86                 index = 0;                                               \
  87                 shift = mmu_psize_defs[psize].shift;                     \
  88
  89 #define pte_iterate_hashed_end() } while(0)
  90
  91 #ifdef CONFIG_PPC_HAS_HASH_64K
  92 #define pte_pagesize_index(mm, addr, pte)       get_slice_psize(mm, addr)
  93 #else
  94 #define pte_pagesize_index(mm, addr, pte)       MMU_PAGE_4K
  95 #endif
  96
  97 /*
  98  * 4-level page tables related bits
  99  */
 100
 101 #define pgd_none(pgd)           (!pgd_val(pgd))
 102 #define pgd_bad(pgd)            (pgd_val(pgd) == 0)
 103 #define pgd_present(pgd)        (pgd_val(pgd) != 0)
 104 #define pgd_clear(pgdp)         (pgd_val(*(pgdp)) = 0)
 105 #define pgd_page_vaddr(pgd)     (pgd_val(pgd) & ~PGD_MASKED_BITS)
 106 #define pgd_page(pgd)           virt_to_page(pgd_page_vaddr(pgd))
 107
 108 #define pud_offset(pgdp, addr)  \
 109   (((pud_t *) pgd_page_vaddr(*(pgdp))) + \
 110     (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
 111
 112 #define pud_ERROR(e) \
 113         printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))
 114
 115 #define remap_4k_pfn(vma, addr, pfn, prot)      \
 116         remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
 117 #endif /* _ASM_POWERPC_PGTABLE_4K_H */