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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 | ||
1c946c1b AK |
16 | #define REGION_SHIFT (MAX_EA_BITS_PER_CONTEXT - 2) |
17 | ||
0034d395 AK |
18 | /* |
19 | * Our page table limit us to 64TB. Hence for the kernel mapping, | |
20 | * each MAP area is limited to 16 TB. | |
21 | * The four map areas are: linear mapping, vmap, IO and vmemmap | |
22 | */ | |
1c946c1b | 23 | #define H_KERN_MAP_SIZE (ASM_CONST(1) << REGION_SHIFT) |
0034d395 AK |
24 | |
25 | /* | |
26 | * Define the address range of the kernel non-linear virtual area | |
27 | * 16TB | |
28 | */ | |
29 | #define H_KERN_VIRT_START ASM_CONST(0xc000100000000000) | |
30 | ||
ab537dca | 31 | #ifndef __ASSEMBLY__ |
dd1842a2 AK |
32 | #define H_PTE_TABLE_SIZE (sizeof(pte_t) << H_PTE_INDEX_SIZE) |
33 | #define H_PMD_TABLE_SIZE (sizeof(pmd_t) << H_PMD_INDEX_SIZE) | |
34 | #define H_PUD_TABLE_SIZE (sizeof(pud_t) << H_PUD_INDEX_SIZE) | |
35 | #define H_PGD_TABLE_SIZE (sizeof(pgd_t) << H_PGD_INDEX_SIZE) | |
ab537dca | 36 | |
273b4936 RP |
37 | #define H_PAGE_F_GIX_SHIFT 53 |
38 | #define H_PAGE_F_SECOND _RPAGE_RPN44 /* HPTE is in 2ndary HPTEG */ | |
39 | #define H_PAGE_F_GIX (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41) | |
9d2edb18 | 40 | #define H_PAGE_BUSY _RPAGE_RSV1 /* software: PTE & hash are busy */ |
273b4936 | 41 | #define H_PAGE_HASHPTE _RPAGE_RSV2 /* software: PTE & hash are busy */ |
9d2edb18 | 42 | |
c605782b | 43 | /* PTE flags to conserve for HPTE identification */ |
945537df AK |
44 | #define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \ |
45 | H_PAGE_F_SECOND | H_PAGE_F_GIX) | |
46 | /* | |
47 | * Not supported by 4k linux page size | |
48 | */ | |
49 | #define H_PAGE_4K_PFN 0x0 | |
50 | #define H_PAGE_THP_HUGE 0x0 | |
51 | #define H_PAGE_COMBO 0x0 | |
1c7ec8a4 AK |
52 | |
53 | /* 8 bytes per each pte entry */ | |
54 | #define H_PTE_FRAG_SIZE_SHIFT (H_PTE_INDEX_SIZE + 3) | |
55 | #define H_PTE_FRAG_NR (PAGE_SIZE >> H_PTE_FRAG_SIZE_SHIFT) | |
8a6c697b AK |
56 | #define H_PMD_FRAG_SIZE_SHIFT (H_PMD_INDEX_SIZE + 3) |
57 | #define H_PMD_FRAG_NR (PAGE_SIZE >> H_PMD_FRAG_SIZE_SHIFT) | |
1a2f7789 AK |
58 | |
59 | /* memory key bits, only 8 keys supported */ | |
33699023 AK |
60 | #define H_PTE_PKEY_BIT4 0 |
61 | #define H_PTE_PKEY_BIT3 0 | |
1a2f7789 | 62 | #define H_PTE_PKEY_BIT2 _RPAGE_RSV3 |
33699023 AK |
63 | #define H_PTE_PKEY_BIT1 _RPAGE_RSV4 |
64 | #define H_PTE_PKEY_BIT0 _RPAGE_RSV5 | |
65 | ||
1a2f7789 | 66 | |
ab537dca | 67 | /* |
368ced78 | 68 | * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() |
ab537dca | 69 | */ |
ab537dca AK |
70 | #define remap_4k_pfn(vma, addr, pfn, prot) \ |
71 | remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot)) | |
72 | ||
26a344ae | 73 | #ifdef CONFIG_HUGETLB_PAGE |
c0a6c719 | 74 | static inline int hash__hugepd_ok(hugepd_t hpd) |
26a344ae | 75 | { |
20717e1f | 76 | unsigned long hpdval = hpd_val(hpd); |
26a344ae | 77 | /* |
6a119eae AK |
78 | * if it is not a pte and have hugepd shift mask |
79 | * set, then it is a hugepd directory pointer | |
26a344ae | 80 | */ |
f1981b5b | 81 | if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) && |
20717e1f | 82 | ((hpdval & HUGEPD_SHIFT_MASK) != 0)) |
6a119eae AK |
83 | return true; |
84 | return false; | |
26a344ae | 85 | } |
26a344ae AK |
86 | #endif |
87 | ||
59aa31fd RP |
88 | /* |
89 | * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just | |
90 | * a matter of returning the PTE bits that need to be modified. On 64K PTE, | |
91 | * things are a little more involved and hence needs many more parameters to | |
92 | * accomplish the same. However we want to abstract this out from the caller by | |
93 | * keeping the prototype consistent across the two formats. | |
94 | */ | |
95 | static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte, | |
ff31e105 AK |
96 | unsigned int subpg_index, unsigned long hidx, |
97 | int offset) | |
59aa31fd RP |
98 | { |
99 | return (hidx << H_PAGE_F_GIX_SHIFT) & | |
100 | (H_PAGE_F_SECOND | H_PAGE_F_GIX); | |
101 | } | |
102 | ||
ab624762 AK |
103 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
104 | ||
105 | static inline char *get_hpte_slot_array(pmd_t *pmdp) | |
106 | { | |
107 | BUG(); | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index) | |
112 | { | |
113 | BUG(); | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array, | |
118 | int index) | |
119 | { | |
120 | BUG(); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array, | |
125 | unsigned int index, unsigned int hidx) | |
126 | { | |
127 | BUG(); | |
128 | } | |
129 | ||
130 | static inline int hash__pmd_trans_huge(pmd_t pmd) | |
131 | { | |
132 | return 0; | |
133 | } | |
134 | ||
135 | static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b) | |
136 | { | |
137 | BUG(); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static inline pmd_t hash__pmd_mkhuge(pmd_t pmd) | |
142 | { | |
143 | BUG(); | |
144 | return pmd; | |
145 | } | |
146 | ||
147 | extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, | |
148 | unsigned long addr, pmd_t *pmdp, | |
149 | unsigned long clr, unsigned long set); | |
150 | extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, | |
151 | unsigned long address, pmd_t *pmdp); | |
152 | extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, | |
153 | pgtable_t pgtable); | |
154 | extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); | |
ab624762 AK |
155 | extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm, |
156 | unsigned long addr, pmd_t *pmdp); | |
157 | extern int hash__has_transparent_hugepage(void); | |
158 | #endif | |
159 | ||
36b78402 AK |
160 | static inline pmd_t hash__pmd_mkdevmap(pmd_t pmd) |
161 | { | |
162 | BUG(); | |
163 | return pmd; | |
164 | } | |
165 | ||
ab537dca AK |
166 | #endif /* !__ASSEMBLY__ */ |
167 | ||
168 | #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */ |