arch/powerpc/include/asm/book3s/64/hash-4k.h

   1 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H
   2 #define _ASM_POWERPC_BOOK3S_64_HASH_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  9
  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 << PUD_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 /* Bits to mask out from a PMD to get to the PTE page */
  44 #define PMD_MASKED_BITS         0
  45 /* Bits to mask out from a PUD to get to the PMD page */
  46 #define PUD_MASKED_BITS         0
  47 /* Bits to mask out from a PGD to get to the PUD page */
  48 #define PGD_MASKED_BITS         0
  49
  50 /* PTE flags to conserve for HPTE identification */
  51 #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \
  52                          _PAGE_F_SECOND | _PAGE_F_GIX)
  53
  54 /* shift to put page number into pte */
  55 #define PTE_RPN_SHIFT   (18)
  56
  57 #define _PAGE_4K_PFN            0
  58 #ifndef __ASSEMBLY__
  59 /*
  60  * 4-level page tables related bits
  61  */
  62
  63 #define pgd_none(pgd)           (!pgd_val(pgd))
  64 #define pgd_bad(pgd)            (pgd_val(pgd) == 0)
  65 #define pgd_present(pgd)        (pgd_val(pgd) != 0)
  66 #define pgd_page_vaddr(pgd)     (pgd_val(pgd) & ~PGD_MASKED_BITS)
  67
  68 static inline void pgd_clear(pgd_t *pgdp)
  69 {
  70         *pgdp = __pgd(0);
  71 }
  72
  73 static inline pte_t pgd_pte(pgd_t pgd)
  74 {
  75         return __pte(pgd_val(pgd));
  76 }
  77
  78 static inline pgd_t pte_pgd(pte_t pte)
  79 {
  80         return __pgd(pte_val(pte));
  81 }
  82 extern struct page *pgd_page(pgd_t pgd);
  83
  84 #define pud_offset(pgdp, addr)  \
  85   (((pud_t *) pgd_page_vaddr(*(pgdp))) + \
  86     (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
  87
  88 #define pud_ERROR(e) \
  89         pr_err("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))
  90
  91 /*
  92  * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() */
  93 #define remap_4k_pfn(vma, addr, pfn, prot)      \
  94         remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
  95
  96 #ifdef CONFIG_HUGETLB_PAGE
  97 /*
  98  * For 4k page size, we support explicit hugepage via hugepd
  99  */
 100 static inline int pmd_huge(pmd_t pmd)
 101 {
 102         return 0;
 103 }
 104
 105 static inline int pud_huge(pud_t pud)
 106 {
 107         return 0;
 108 }
 109
 110 static inline int pgd_huge(pgd_t pgd)
 111 {
 112         return 0;
 113 }
 114 #define pgd_huge pgd_huge
 115
 116 static inline int hugepd_ok(hugepd_t hpd)
 117 {
 118         /*
 119          * if it is not a pte and have hugepd shift mask
 120          * set, then it is a hugepd directory pointer
 121          */
 122         if (!(hpd.pd & _PAGE_PTE) &&
 123             ((hpd.pd & HUGEPD_SHIFT_MASK) != 0))
 124                 return true;
 125         return false;
 126 }
 127 #define is_hugepd(hpd)          (hugepd_ok(hpd))
 128 #endif
 129
 130 #endif /* !__ASSEMBLY__ */
 131
 132 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */