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

INCLUDED FROM

DEFINITIONS

1. pmd_huge
2. pud_huge
3. pgd_huge
4. hugepd_ok
5. get_hugepd_cache_index
6. pmd_huge
7. pud_huge
8. remap_4k_pfn

   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  */
  17 static 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 
  25 static 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 
  33 static 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  */
  47 static 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  */
  57 static inline int get_hugepd_cache_index(int index)
  58 {
  59         BUG();
  60 }
  61 
  62 #else /* !CONFIG_HUGETLB_PAGE */
  63 static inline int pmd_huge(pmd_t pmd) { return 0; }
  64 static inline int pud_huge(pud_t pud) { return 0; }
  65 #endif /* CONFIG_HUGETLB_PAGE */
  66 
  67 static inline int remap_4k_pfn(struct vm_area_struct *vma, unsigned long addr,
  68                                unsigned long pfn, pgprot_t prot)
  69 {
  70         if (radix_enabled())
  71                 BUG();
  72         return hash__remap_4k_pfn(vma, addr, pfn, prot);
  73 }
  74 #endif  /* __ASSEMBLY__ */
  75 #endif /*_ASM_POWERPC_BOOK3S_64_PGTABLE_64K_H */