LXR linux/arch/powerpc/include/asm/book3s/64/pgtable-64k.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_64K_H
   3#define _ASM_POWERPC_BOOK3S_64_PGTABLE_64K_H
   4
   5#ifndef __ASSEMBLY__
   6#ifdef CONFIG_HUGETLB_PAGE
   7/*
   8 * We have PGD_INDEX_SIZ = 12 and PTE_INDEX_SIZE = 8, so that we can have
   9 * 16GB hugepage pte in PGD and 16MB hugepage pte at PMD;
  10 *
  11 * Defined in such a way that we can optimize away code block at build time
  12 * if CONFIG_HUGETLB_PAGE=n.
  13 *
  14 * returns true for pmd migration entries, THP, devmap, hugetlb
  15 * But compile time dependent on CONFIG_HUGETLB_PAGE
  16 */
  17static inline int pmd_huge(pmd_t pmd)
  18{
  19        /*
  20         * leaf pte for huge page
  21         */
  22        return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
  23}
  24
  25static inline int pud_huge(pud_t pud)
  26{
  27        /*
  28         * leaf pte for huge page
  29         */
  30        return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
  31}
  32
  33static inline int pgd_huge(pgd_t pgd)
  34{
  35        /*
  36         * leaf pte for huge page
  37         */
  38        return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE));
  39}
  40#define pgd_huge pgd_huge
  41
  42/*
  43 * With 64k page size, we have hugepage ptes in the pgd and pmd entries. We don't
  44 * need to setup hugepage directory for them. Our pte and page directory format
  45 * enable us to have this enabled.
  46 */
  47static inline int hugepd_ok(hugepd_t hpd)
  48{
  49        return 0;
  50}
  51
  52#define is_hugepd(pdep)                 0
  53
  54/*
  55 * This should never get called
  56 */
  57static inline int get_hugepd_cache_index(int index)
  58{
  59        BUG();
  60}
  61
  62#endif /* CONFIG_HUGETLB_PAGE */
  63
  64static inline int remap_4k_pfn(struct vm_area_struct *vma, unsigned long addr,
  65                               unsigned long pfn, pgprot_t prot)
  66{
  67        if (radix_enabled())
  68                BUG();
  69        return hash__remap_4k_pfn(vma, addr, pfn, prot);
  70}
  71#endif  /* __ASSEMBLY__ */
  72#endif /*_ASM_POWERPC_BOOK3S_64_PGTABLE_64K_H */
  73