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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 */ | |
60 | #define H_PTE_PKEY_BIT0 0 | |
61 | #define H_PTE_PKEY_BIT1 0 | |
62 | #define H_PTE_PKEY_BIT2 _RPAGE_RSV3 | |
63 | #define H_PTE_PKEY_BIT3 _RPAGE_RSV4 | |
64 | #define H_PTE_PKEY_BIT4 _RPAGE_RSV5 | |
65 | ||
ab537dca | 66 | /* |
368ced78 | 67 | * On all 4K setups, remap_4k_pfn() equates to remap_pfn_range() |
ab537dca | 68 | */ |
ab537dca AK |
69 | #define remap_4k_pfn(vma, addr, pfn, prot) \ |
70 | remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot)) | |
71 | ||
26a344ae | 72 | #ifdef CONFIG_HUGETLB_PAGE |
c0a6c719 | 73 | static inline int hash__hugepd_ok(hugepd_t hpd) |
26a344ae | 74 | { |
20717e1f | 75 | unsigned long hpdval = hpd_val(hpd); |
26a344ae | 76 | /* |
6a119eae AK |
77 | * if it is not a pte and have hugepd shift mask |
78 | * set, then it is a hugepd directory pointer | |
26a344ae | 79 | */ |
f1981b5b | 80 | if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) && |
20717e1f | 81 | ((hpdval & HUGEPD_SHIFT_MASK) != 0)) |
6a119eae AK |
82 | return true; |
83 | return false; | |
26a344ae | 84 | } |
26a344ae AK |
85 | #endif |
86 | ||
59aa31fd RP |
87 | /* |
88 | * 4K PTE format is different from 64K PTE format. Saving the hash_slot is just | |
89 | * a matter of returning the PTE bits that need to be modified. On 64K PTE, | |
90 | * things are a little more involved and hence needs many more parameters to | |
91 | * accomplish the same. However we want to abstract this out from the caller by | |
92 | * keeping the prototype consistent across the two formats. | |
93 | */ | |
94 | static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte, | |
ff31e105 AK |
95 | unsigned int subpg_index, unsigned long hidx, |
96 | int offset) | |
59aa31fd RP |
97 | { |
98 | return (hidx << H_PAGE_F_GIX_SHIFT) & | |
99 | (H_PAGE_F_SECOND | H_PAGE_F_GIX); | |
100 | } | |
101 | ||
ab624762 AK |
102 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
103 | ||
104 | static inline char *get_hpte_slot_array(pmd_t *pmdp) | |
105 | { | |
106 | BUG(); | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index) | |
111 | { | |
112 | BUG(); | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array, | |
117 | int index) | |
118 | { | |
119 | BUG(); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array, | |
124 | unsigned int index, unsigned int hidx) | |
125 | { | |
126 | BUG(); | |
127 | } | |
128 | ||
129 | static inline int hash__pmd_trans_huge(pmd_t pmd) | |
130 | { | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b) | |
135 | { | |
136 | BUG(); | |
137 | return 0; | |
138 | } | |
139 | ||
140 | static inline pmd_t hash__pmd_mkhuge(pmd_t pmd) | |
141 | { | |
142 | BUG(); | |
143 | return pmd; | |
144 | } | |
145 | ||
146 | extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, | |
147 | unsigned long addr, pmd_t *pmdp, | |
148 | unsigned long clr, unsigned long set); | |
149 | extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, | |
150 | unsigned long address, pmd_t *pmdp); | |
151 | extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, | |
152 | pgtable_t pgtable); | |
153 | extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); | |
ab624762 AK |
154 | extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm, |
155 | unsigned long addr, pmd_t *pmdp); | |
156 | extern int hash__has_transparent_hugepage(void); | |
157 | #endif | |
158 | ||
ab537dca AK |
159 | #endif /* !__ASSEMBLY__ */ |
160 | ||
161 | #endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */ |