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pgtable-4k.h

#ifndef _ASM_POWERPC_PGTABLE_4K_H
#define _ASM_POWERPC_PGTABLE_4K_H
/*
 * Entries per page directory level.  The PTE level must use a 64b record
 * for each page table entry.  The PMD and PGD level use a 32b record for
 * each entry by assuming that each entry is page aligned.
 */
#define PTE_INDEX_SIZE  9
#define PMD_INDEX_SIZE  7
#define PUD_INDEX_SIZE  7
#define PGD_INDEX_SIZE  9

#ifndef __ASSEMBLY__
#define PTE_TABLE_SIZE  (sizeof(pte_t) << PTE_INDEX_SIZE)
#define PMD_TABLE_SIZE  (sizeof(pmd_t) << PMD_INDEX_SIZE)
#define PUD_TABLE_SIZE  (sizeof(pud_t) << PUD_INDEX_SIZE)
#define PGD_TABLE_SIZE  (sizeof(pgd_t) << PGD_INDEX_SIZE)
#endif      /* __ASSEMBLY__ */

#define PTRS_PER_PTE    (1 << PTE_INDEX_SIZE)
#define PTRS_PER_PMD    (1 << PMD_INDEX_SIZE)
#define PTRS_PER_PUD    (1 << PMD_INDEX_SIZE)
#define PTRS_PER_PGD    (1 << PGD_INDEX_SIZE)

/* PMD_SHIFT determines what a second-level page table entry can map */
#define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
#define PMD_SIZE  (1UL << PMD_SHIFT)
#define PMD_MASK  (~(PMD_SIZE-1))

/* With 4k base page size, hugepage PTEs go at the PMD level */
#define MIN_HUGEPTE_SHIFT     PMD_SHIFT

/* PUD_SHIFT determines what a third-level page table entry can map */
#define PUD_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE)
#define PUD_SIZE  (1UL << PUD_SHIFT)
#define PUD_MASK  (~(PUD_SIZE-1))

/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
#define PGDIR_SHIFT     (PUD_SHIFT + PUD_INDEX_SIZE)
#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
#define PGDIR_MASK      (~(PGDIR_SIZE-1))

/* PTE bits */
#define _PAGE_HASHPTE   0x0400 /* software: pte has an associated HPTE */
#define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
#define _PAGE_GROUP_IX  0x7000 /* software: HPTE index within group */
#define _PAGE_F_SECOND  _PAGE_SECONDARY
#define _PAGE_F_GIX     _PAGE_GROUP_IX
#define _PAGE_SPECIAL   0x10000 /* software: special page */
#define __HAVE_ARCH_PTE_SPECIAL

/* PTE flags to conserve for HPTE identification */
#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \
                   _PAGE_SECONDARY | _PAGE_GROUP_IX)

/* There is no 4K PFN hack on 4K pages */
#define _PAGE_4K_PFN    0

/* PAGE_MASK gives the right answer below, but only by accident */
/* It should be preserving the high 48 bits and then specifically */
/* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \
                         _PAGE_HPTEFLAGS)

/* Bits to mask out from a PMD to get to the PTE page */
#define PMD_MASKED_BITS       0
/* Bits to mask out from a PUD to get to the PMD page */
#define PUD_MASKED_BITS       0
/* Bits to mask out from a PGD to get to the PUD page */
#define PGD_MASKED_BITS       0

/* shift to put page number into pte */
#define PTE_RPN_SHIFT   (17)

#ifdef STRICT_MM_TYPECHECKS
#define __real_pte(e,p)       ((real_pte_t){(e)})
#define __rpte_to_pte(r)      ((r).pte)
#else
#define __real_pte(e,p)       (e)
#define __rpte_to_pte(r)      (__pte(r))
#endif
#define __rpte_to_hidx(r,index)     (pte_val(__rpte_to_pte(r)) >> 12)

#define pte_iterate_hashed_subpages(rpte, psize, va, index, shift)       \
      do {                                               \
            index = 0;                                   \
            shift = mmu_psize_defs[psize].shift;                     \

#define pte_iterate_hashed_end() } while(0)

#ifdef CONFIG_PPC_HAS_HASH_64K
#define pte_pagesize_index(mm, addr, pte) get_slice_psize(mm, addr)
#else
#define pte_pagesize_index(mm, addr, pte) MMU_PAGE_4K
#endif

/*
 * 4-level page tables related bits
 */

#define pgd_none(pgd)         (!pgd_val(pgd))
#define pgd_bad(pgd)          (pgd_val(pgd) == 0)
#define pgd_present(pgd)      (pgd_val(pgd) != 0)
#define pgd_clear(pgdp)       (pgd_val(*(pgdp)) = 0)
#define pgd_page_vaddr(pgd)   (pgd_val(pgd) & ~PGD_MASKED_BITS)
#define pgd_page(pgd)         virt_to_page(pgd_page_vaddr(pgd))

#define pud_offset(pgdp, addr)      \
  (((pud_t *) pgd_page_vaddr(*(pgdp))) + \
    (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))

#define pud_ERROR(e) \
      printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))

#define remap_4k_pfn(vma, addr, pfn, prot)      \
      remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
#endif /* _ASM_POWERPC_PGTABLE_4K_H */

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