1 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H
2 #define _ASM_POWERPC_BOOK3S_64_HASH_4K_H
3 /*
4  * Entries per page directory level.  The PTE level must use a 64b record
5  * for each page table entry.  The PMD and PGD level use a 32b record for
6  * each entry by assuming that each entry is page aligned.
7  */
8 #define H_PTE_INDEX_SIZE  9
9 #define H_PMD_INDEX_SIZE  7
10 #define H_PUD_INDEX_SIZE  9
11 #define H_PGD_INDEX_SIZE  9
12 
13 #ifndef __ASSEMBLY__
14 #define H_PTE_TABLE_SIZE	(sizeof(pte_t) << H_PTE_INDEX_SIZE)
15 #define H_PMD_TABLE_SIZE	(sizeof(pmd_t) << H_PMD_INDEX_SIZE)
16 #define H_PUD_TABLE_SIZE	(sizeof(pud_t) << H_PUD_INDEX_SIZE)
17 #define H_PGD_TABLE_SIZE	(sizeof(pgd_t) << H_PGD_INDEX_SIZE)
18 
19 /* PTE flags to conserve for HPTE identification */
20 #define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \
21 			 H_PAGE_F_SECOND | H_PAGE_F_GIX)
22 /*
23  * Not supported by 4k linux page size
24  */
25 #define H_PAGE_4K_PFN	0x0
26 #define H_PAGE_THP_HUGE 0x0
27 #define H_PAGE_COMBO	0x0
28 #define H_PTE_FRAG_NR	0
29 #define H_PTE_FRAG_SIZE_SHIFT  0
30 /*
31  * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range()
32  */
33 #define remap_4k_pfn(vma, addr, pfn, prot)	\
34 	remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
35 
36 #ifdef CONFIG_HUGETLB_PAGE
37 static inline int hash__hugepd_ok(hugepd_t hpd)
38 {
39 	/*
40 	 * if it is not a pte and have hugepd shift mask
41 	 * set, then it is a hugepd directory pointer
42 	 */
43 	if (!(hpd.pd & _PAGE_PTE) &&
44 	    ((hpd.pd & HUGEPD_SHIFT_MASK) != 0))
45 		return true;
46 	return false;
47 }
48 #endif
49 
50 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
51 
52 static inline char *get_hpte_slot_array(pmd_t *pmdp)
53 {
54 	BUG();
55 	return NULL;
56 }
57 
58 static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index)
59 {
60 	BUG();
61 	return 0;
62 }
63 
64 static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array,
65 					   int index)
66 {
67 	BUG();
68 	return 0;
69 }
70 
71 static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array,
72 					unsigned int index, unsigned int hidx)
73 {
74 	BUG();
75 }
76 
77 static inline int hash__pmd_trans_huge(pmd_t pmd)
78 {
79 	return 0;
80 }
81 
82 static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
83 {
84 	BUG();
85 	return 0;
86 }
87 
88 static inline pmd_t hash__pmd_mkhuge(pmd_t pmd)
89 {
90 	BUG();
91 	return pmd;
92 }
93 
94 extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm,
95 					   unsigned long addr, pmd_t *pmdp,
96 					   unsigned long clr, unsigned long set);
97 extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma,
98 				   unsigned long address, pmd_t *pmdp);
99 extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
100 					 pgtable_t pgtable);
101 extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
102 extern void hash__pmdp_huge_split_prepare(struct vm_area_struct *vma,
103 				      unsigned long address, 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 */
112