arch/powerpc/include/asm/book3s/64/hash-4k.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H
   3 #define _ASM_POWERPC_BOOK3S_64_HASH_4K_H
   4 /*
   5  * Entries per page directory level.  The PTE level must use a 64b record
   6  * for each page table entry.  The PMD and PGD level use a 32b record for
   7  * each entry by assuming that each entry is page aligned.
   8  */
   9 #define H_PTE_INDEX_SIZE  9
  10 #define H_PMD_INDEX_SIZE  7
  11 #define H_PUD_INDEX_SIZE  9
  12 #define H_PGD_INDEX_SIZE  9
  13
  14 #ifndef __ASSEMBLY__
  15 #define H_PTE_TABLE_SIZE        (sizeof(pte_t) << H_PTE_INDEX_SIZE)
  16 #define H_PMD_TABLE_SIZE        (sizeof(pmd_t) << H_PMD_INDEX_SIZE)
  17 #define H_PUD_TABLE_SIZE        (sizeof(pud_t) << H_PUD_INDEX_SIZE)
  18 #define H_PGD_TABLE_SIZE        (sizeof(pgd_t) << H_PGD_INDEX_SIZE)
  19
  20 /* PTE flags to conserve for HPTE identification */
  21 #define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \
  22                          H_PAGE_F_SECOND | H_PAGE_F_GIX)
  23 /*
  24  * Not supported by 4k linux page size
  25  */
  26 #define H_PAGE_4K_PFN   0x0
  27 #define H_PAGE_THP_HUGE 0x0
  28 #define H_PAGE_COMBO    0x0
  29 #define H_PTE_FRAG_NR   0
  30 #define H_PTE_FRAG_SIZE_SHIFT  0
  31 /*
  32  * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range()
  33  */
  34 #define remap_4k_pfn(vma, addr, pfn, prot)      \
  35         remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
  36
  37 #ifdef CONFIG_HUGETLB_PAGE
  38 static inline int hash__hugepd_ok(hugepd_t hpd)
  39 {
  40         unsigned long hpdval = hpd_val(hpd);
  41         /*
  42          * if it is not a pte and have hugepd shift mask
  43          * set, then it is a hugepd directory pointer
  44          */
  45         if (!(hpdval & _PAGE_PTE) &&
  46             ((hpdval & HUGEPD_SHIFT_MASK) != 0))
  47                 return true;
  48         return false;
  49 }
  50 #endif
  51
  52 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  53
  54 static inline char *get_hpte_slot_array(pmd_t *pmdp)
  55 {
  56         BUG();
  57         return NULL;
  58 }
  59
  60 static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index)
  61 {
  62         BUG();
  63         return 0;
  64 }
  65
  66 static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array,
  67                                            int index)
  68 {
  69         BUG();
  70         return 0;
  71 }
  72
  73 static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array,
  74                                         unsigned int index, unsigned int hidx)
  75 {
  76         BUG();
  77 }
  78
  79 static inline int hash__pmd_trans_huge(pmd_t pmd)
  80 {
  81         return 0;
  82 }
  83
  84 static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
  85 {
  86         BUG();
  87         return 0;
  88 }
  89
  90 static inline pmd_t hash__pmd_mkhuge(pmd_t pmd)
  91 {
  92         BUG();
  93         return pmd;
  94 }
  95
  96 extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm,
  97                                            unsigned long addr, pmd_t *pmdp,
  98                                            unsigned long clr, unsigned long set);
  99 extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma,
 100                                    unsigned long address, pmd_t *pmdp);
 101 extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
 102                                          pgtable_t pgtable);
 103 extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
 104 extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
 105                                        unsigned long addr, pmd_t *pmdp);
 106 extern int hash__has_transparent_hugepage(void);
 107 #endif
 108
 109 #endif /* !__ASSEMBLY__ */
 110
 111 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */