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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
ab537dca AK |
2 | #ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H |
3 | #define _ASM_POWERPC_BOOK3S_64_HASH_4K_H | |
423e2f94 | 4 | |
eea86aa4 ME |
5 | #define H_PTE_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 4KB = 2MB |
6 | #define H_PMD_INDEX_SIZE 7 // size: 8B << 7 = 1KB, maps: 2^7 x 2MB = 256MB | |
7 | #define H_PUD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 256MB = 128GB | |
8 | #define H_PGD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 128GB = 64TB | |
ab537dca | 9 | |
f384796c AK |
10 | /* |
11 | * Each context is 512TB. But on 4k we restrict our max TASK size to 64TB | |
12 | * Hence also limit max EA bits to 64TB. | |
13 | */ | |
14 | #define MAX_EA_BITS_PER_CONTEXT 46 | |
15 | ||
0034d395 AK |
16 | /* |
17 | * Our page table limit us to 64TB. Hence for the kernel mapping, | |
18 | * each MAP area is limited to 16 TB. | |
19 | * The four map areas are: linear mapping, vmap, IO and vmemmap | |
20 | */ | |
21 | #define H_KERN_MAP_SIZE (ASM_CONST(1) << (MAX_EA_BITS_PER_CONTEXT - 2)) | |
22 | ||
23 | /* | |
24 | * Define the address range of the kernel non-linear virtual area | |
25 | * 16TB | |
26 | */ | |
27 | #define H_KERN_VIRT_START ASM_CONST(0xc000100000000000) | |
28 | ||
ab537dca | 29 | #ifndef __ASSEMBLY__ |
dd1842a2 AK |
30 | #define H_PTE_TABLE_SIZE (sizeof(pte_t) << H_PTE_INDEX_SIZE) |
31 | #define H_PMD_TABLE_SIZE (sizeof(pmd_t) << H_PMD_INDEX_SIZE) | |
32 | #define H_PUD_TABLE_SIZE (sizeof(pud_t) << H_PUD_INDEX_SIZE) | |
33 | #define H_PGD_TABLE_SIZE (sizeof(pgd_t) << H_PGD_INDEX_SIZE) | |
ab537dca | 34 | |
273b4936 RP |
35 | #define H_PAGE_F_GIX_SHIFT 53 |
36 | #define H_PAGE_F_SECOND _RPAGE_RPN44 /* HPTE is in 2ndary HPTEG */ | |
37 | #define H_PAGE_F_GIX (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41) | |
9d2edb18 | 38 | #define H_PAGE_BUSY _RPAGE_RSV1 /* software: PTE & hash are busy */ |
273b4936 | 39 | #define H_PAGE_HASHPTE _RPAGE_RSV2 /* software: PTE & hash are busy */ |
9d2edb18 | 40 | |
c605782b | 41 | /* PTE flags to conserve for HPTE identification */ |
945537df AK |
42 | #define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \ |
43 | H_PAGE_F_SECOND | H_PAGE_F_GIX) | |
44 | /* | |
45 | * Not supported by 4k linux page size | |
46 | */ | |
47 | #define H_PAGE_4K_PFN 0x0 | |
48 | #define H_PAGE_THP_HUGE 0x0 | |
49 | #define H_PAGE_COMBO 0x0 | |
1c7ec8a4 AK |
50 | |
51 | /* 8 bytes per each pte entry */ | |
52 | #define H_PTE_FRAG_SIZE_SHIFT (H_PTE_INDEX_SIZE + 3) | |
53 | #define H_PTE_FRAG_NR (PAGE_SIZE >> H_PTE_FRAG_SIZE_SHIFT) | |
8a6c697b AK |
54 | #define H_PMD_FRAG_SIZE_SHIFT (H_PMD_INDEX_SIZE + 3) |
55 | #define H_PMD_FRAG_NR (PAGE_SIZE >> H_PMD_FRAG_SIZE_SHIFT) | |
1a2f7789 AK |
56 | |
57 | /* memory key bits, only 8 keys supported */ | |
58 | #define H_PTE_PKEY_BIT0 0 | |
59 | #define H_PTE_PKEY_BIT1 0 | |
60 | #define H_PTE_PKEY_BIT2 _RPAGE_RSV3 | |
61 | #define H_PTE_PKEY_BIT3 _RPAGE_RSV4 | |
62 | #define H_PTE_PKEY_BIT4 _RPAGE_RSV5 | |
63 | ||
ab537dca | 64 | /* |
368ced78 | 65 | * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() |
ab537dca | 66 | */ |
ab537dca AK |
67 | #define remap_4k_pfn(vma, addr, pfn, prot) \ |
68 | remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot)) | |
69 | ||
26a344ae | 70 | #ifdef CONFIG_HUGETLB_PAGE |
c0a6c719 | 71 | static inline int hash__hugepd_ok(hugepd_t hpd) |
26a344ae | 72 | { |
20717e1f | 73 | unsigned long hpdval = hpd_val(hpd); |
26a344ae | 74 | /* |
6a119eae AK |
75 | * if it is not a pte and have hugepd shift mask |
76 | * set, then it is a hugepd directory pointer | |
26a344ae | 77 | */ |
f1981b5b | 78 | if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) && |
20717e1f | 79 | ((hpdval & HUGEPD_SHIFT_MASK) != 0)) |
6a119eae AK |
80 | return true; |
81 | return false; | |
26a344ae | 82 | } |
26a344ae AK |
83 | #endif |
84 | ||
59aa31fd RP |
85 | /* |
86 | * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just | |
87 | * a matter of returning the PTE bits that need to be modified. On 64K PTE, | |
88 | * things are a little more involved and hence needs many more parameters to | |
89 | * accomplish the same. However we want to abstract this out from the caller by | |
90 | * keeping the prototype consistent across the two formats. | |
91 | */ | |
92 | static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte, | |
ff31e105 AK |
93 | unsigned int subpg_index, unsigned long hidx, |
94 | int offset) | |
59aa31fd RP |
95 | { |
96 | return (hidx << H_PAGE_F_GIX_SHIFT) & | |
97 | (H_PAGE_F_SECOND | H_PAGE_F_GIX); | |
98 | } | |
99 | ||
ab624762 AK |
100 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
101 | ||
102 | static inline char *get_hpte_slot_array(pmd_t *pmdp) | |
103 | { | |
104 | BUG(); | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index) | |
109 | { | |
110 | BUG(); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array, | |
115 | int index) | |
116 | { | |
117 | BUG(); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array, | |
122 | unsigned int index, unsigned int hidx) | |
123 | { | |
124 | BUG(); | |
125 | } | |
126 | ||
127 | static inline int hash__pmd_trans_huge(pmd_t pmd) | |
128 | { | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b) | |
133 | { | |
134 | BUG(); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static inline pmd_t hash__pmd_mkhuge(pmd_t pmd) | |
139 | { | |
140 | BUG(); | |
141 | return pmd; | |
142 | } | |
143 | ||
144 | extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, | |
145 | unsigned long addr, pmd_t *pmdp, | |
146 | unsigned long clr, unsigned long set); | |
147 | extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, | |
148 | unsigned long address, pmd_t *pmdp); | |
149 | extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, | |
150 | pgtable_t pgtable); | |
151 | extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); | |
ab624762 AK |
152 | extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm, |
153 | unsigned long addr, pmd_t *pmdp); | |
154 | extern int hash__has_transparent_hugepage(void); | |
155 | #endif | |
156 | ||
ab537dca AK |
157 | #endif /* !__ASSEMBLY__ */ |
158 | ||
159 | #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */ |