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 void hash__pmdp_huge_split_prepare(struct vm_area_struct *vma,
105 				      unsigned long address, pmd_t *pmdp);
106 extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
107 				       unsigned long addr, pmd_t *pmdp);
108 extern int hash__has_transparent_hugepage(void);
109 #endif
110 
111 #endif /* !__ASSEMBLY__ */
112 
113 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */
114