pgtable-ppc64-4k.h

Go to the documentation of this file.

#ifndef _ASM_POWERPC_PGTABLE_PPC64_4K_H
#define _ASM_POWERPC_PGTABLE_PPC64_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  9
#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 << PUD_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))

/* 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


/*
 * 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))

/*
 * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() */
#define remap_4k_pfn(vma, addr, pfn, prot)  \
    remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))

#endif /* _ASM_POWERPC_PGTABLE_PPC64_4K_H */