arch/powerpc/include/asm/nohash/64/pgtable-64k.h

   1 #ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_64K_H
   2 #define _ASM_POWERPC_NOHASH_64_PGTABLE_64K_H
   3
   4 #define __ARCH_USE_5LEVEL_HACK
   5 #include <asm-generic/pgtable-nopud.h>
   6
   7
   8 #define PTE_INDEX_SIZE  8
   9 #define PMD_INDEX_SIZE  10
  10 #define PUD_INDEX_SIZE  0
  11 #define PGD_INDEX_SIZE  12
  12
  13 /*
  14  * we support 32 fragments per PTE page of 64K size
  15  */
  16 #define PTE_FRAG_NR     32
  17 /*
  18  * We use a 2K PTE page fragment and another 2K for storing
  19  * real_pte_t hash index
  20  */
  21 #define PTE_FRAG_SIZE_SHIFT  11
  22 #define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
  23
  24 #ifndef __ASSEMBLY__
  25 #define PTE_TABLE_SIZE  PTE_FRAG_SIZE
  26 #define PMD_TABLE_SIZE  (sizeof(pmd_t) << PMD_INDEX_SIZE)
  27 #define PUD_TABLE_SIZE  (0)
  28 #define PGD_TABLE_SIZE  (sizeof(pgd_t) << PGD_INDEX_SIZE)
  29 #endif  /* __ASSEMBLY__ */
  30
  31 #define PTRS_PER_PTE    (1 << PTE_INDEX_SIZE)
  32 #define PTRS_PER_PMD    (1 << PMD_INDEX_SIZE)
  33 #define PTRS_PER_PGD    (1 << PGD_INDEX_SIZE)
  34
  35 /* PMD_SHIFT determines what a second-level page table entry can map */
  36 #define PMD_SHIFT       (PAGE_SHIFT + PTE_INDEX_SIZE)
  37 #define PMD_SIZE        (1UL << PMD_SHIFT)
  38 #define PMD_MASK        (~(PMD_SIZE-1))
  39
  40 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  41 #define PGDIR_SHIFT     (PMD_SHIFT + PMD_INDEX_SIZE)
  42 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  43 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  44
  45 /*
  46  * Bits to mask out from a PMD to get to the PTE page
  47  * PMDs point to PTE table fragments which are PTE_FRAG_SIZE aligned.
  48  */
  49 #define PMD_MASKED_BITS         (PTE_FRAG_SIZE - 1)
  50 /* Bits to mask out from a PGD/PUD to get to the PMD page */
  51 #define PUD_MASKED_BITS         0x1ff
  52
  53 #define pgd_pte(pgd)    (pud_pte(((pud_t){ pgd })))
  54 #define pte_pgd(pte)    ((pgd_t)pte_pud(pte))
  55
  56 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_64K_H */