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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
b0b5e9b1 AK |
2 | #ifndef _ASM_POWERPC_PGTABLE_RADIX_H |
3 | #define _ASM_POWERPC_PGTABLE_RADIX_H | |
4 | ||
ec0c464c CL |
5 | #include <asm/asm-const.h> |
6 | ||
b0b5e9b1 AK |
7 | #ifndef __ASSEMBLY__ |
8 | #include <asm/cmpxchg.h> | |
9 | #endif | |
10 | ||
11 | #ifdef CONFIG_PPC_64K_PAGES | |
12 | #include <asm/book3s/64/radix-64k.h> | |
13 | #else | |
14 | #include <asm/book3s/64/radix-4k.h> | |
15 | #endif | |
16 | ||
c6d1a767 AK |
17 | #ifndef __ASSEMBLY__ |
18 | #include <asm/book3s/64/tlbflush-radix.h> | |
19 | #include <asm/cpu_has_feature.h> | |
20 | #endif | |
21 | ||
b0b5e9b1 AK |
22 | /* An empty PTE can still have a R or C writeback */ |
23 | #define RADIX_PTE_NONE_MASK (_PAGE_DIRTY | _PAGE_ACCESSED) | |
24 | ||
25 | /* Bits to set in a RPMD/RPUD/RPGD */ | |
26 | #define RADIX_PMD_VAL_BITS (0x8000000000000000UL | RADIX_PTE_INDEX_SIZE) | |
27 | #define RADIX_PUD_VAL_BITS (0x8000000000000000UL | RADIX_PMD_INDEX_SIZE) | |
28 | #define RADIX_PGD_VAL_BITS (0x8000000000000000UL | RADIX_PUD_INDEX_SIZE) | |
29 | ||
30 | /* Don't have anything in the reserved bits and leaf bits */ | |
31 | #define RADIX_PMD_BAD_BITS 0x60000000000000e0UL | |
32 | #define RADIX_PUD_BAD_BITS 0x60000000000000e0UL | |
33 | #define RADIX_PGD_BAD_BITS 0x60000000000000e0UL | |
34 | ||
a2dc009a AK |
35 | #define RADIX_PMD_SHIFT (PAGE_SHIFT + RADIX_PTE_INDEX_SIZE) |
36 | #define RADIX_PUD_SHIFT (RADIX_PMD_SHIFT + RADIX_PMD_INDEX_SIZE) | |
37 | #define RADIX_PGD_SHIFT (RADIX_PUD_SHIFT + RADIX_PUD_INDEX_SIZE) | |
b0b5e9b1 AK |
38 | /* |
39 | * Size of EA range mapped by our pagetables. | |
40 | */ | |
41 | #define RADIX_PGTABLE_EADDR_SIZE (RADIX_PTE_INDEX_SIZE + RADIX_PMD_INDEX_SIZE + \ | |
42 | RADIX_PUD_INDEX_SIZE + RADIX_PGD_INDEX_SIZE + PAGE_SHIFT) | |
43 | #define RADIX_PGTABLE_RANGE (ASM_CONST(1) << RADIX_PGTABLE_EADDR_SIZE) | |
44 | ||
d6a9996e AK |
45 | /* |
46 | * We support 52 bit address space, Use top bit for kernel | |
47 | * virtual mapping. Also make sure kernel fit in the top | |
48 | * quadrant. | |
49 | * | |
50 | * +------------------+ | |
51 | * +------------------+ Kernel virtual map (0xc008000000000000) | |
52 | * | | | |
53 | * | | | |
54 | * | | | |
55 | * 0b11......+------------------+ Kernel linear map (0xc....) | |
56 | * | | | |
57 | * | 2 quadrant | | |
58 | * | | | |
59 | * 0b10......+------------------+ | |
60 | * | | | |
61 | * | 1 quadrant | | |
62 | * | | | |
63 | * 0b01......+------------------+ | |
64 | * | | | |
65 | * | 0 quadrant | | |
66 | * | | | |
67 | * 0b00......+------------------+ | |
68 | * | |
69 | * | |
70 | * 3rd quadrant expanded: | |
71 | * +------------------------------+ | |
72 | * | | | |
73 | * | | | |
74 | * | | | |
75 | * +------------------------------+ Kernel IO map end (0xc010000000000000) | |
76 | * | | | |
77 | * | | | |
78 | * | 1/2 of virtual map | | |
79 | * | | | |
80 | * | | | |
81 | * +------------------------------+ Kernel IO map start | |
82 | * | | | |
83 | * | 1/4 of virtual map | | |
84 | * | | | |
85 | * +------------------------------+ Kernel vmemap start | |
86 | * | | | |
87 | * | 1/4 of virtual map | | |
88 | * | | | |
89 | * +------------------------------+ Kernel virt start (0xc008000000000000) | |
90 | * | | | |
91 | * | | | |
92 | * | | | |
93 | * +------------------------------+ Kernel linear (0xc.....) | |
94 | */ | |
95 | ||
96 | #define RADIX_KERN_VIRT_START ASM_CONST(0xc008000000000000) | |
97 | #define RADIX_KERN_VIRT_SIZE ASM_CONST(0x0008000000000000) | |
98 | ||
99 | /* | |
100 | * The vmalloc space starts at the beginning of that region, and | |
101 | * occupies a quarter of it on radix config. | |
102 | * (we keep a quarter for the virtual memmap) | |
103 | */ | |
104 | #define RADIX_VMALLOC_START RADIX_KERN_VIRT_START | |
105 | #define RADIX_VMALLOC_SIZE (RADIX_KERN_VIRT_SIZE >> 2) | |
106 | #define RADIX_VMALLOC_END (RADIX_VMALLOC_START + RADIX_VMALLOC_SIZE) | |
107 | /* | |
108 | * Defines the address of the vmemap area, in its own region on | |
109 | * hash table CPUs. | |
110 | */ | |
111 | #define RADIX_VMEMMAP_BASE (RADIX_VMALLOC_END) | |
112 | ||
63ee9b2f ME |
113 | #define RADIX_KERN_IO_START (RADIX_KERN_VIRT_START + (RADIX_KERN_VIRT_SIZE >> 1)) |
114 | ||
b0b5e9b1 AK |
115 | #ifndef __ASSEMBLY__ |
116 | #define RADIX_PTE_TABLE_SIZE (sizeof(pte_t) << RADIX_PTE_INDEX_SIZE) | |
117 | #define RADIX_PMD_TABLE_SIZE (sizeof(pmd_t) << RADIX_PMD_INDEX_SIZE) | |
118 | #define RADIX_PUD_TABLE_SIZE (sizeof(pud_t) << RADIX_PUD_INDEX_SIZE) | |
119 | #define RADIX_PGD_TABLE_SIZE (sizeof(pgd_t) << RADIX_PGD_INDEX_SIZE) | |
120 | ||
cd65d697 BS |
121 | #ifdef CONFIG_STRICT_KERNEL_RWX |
122 | extern void radix__mark_rodata_ro(void); | |
029d9252 | 123 | extern void radix__mark_initmem_nx(void); |
cd65d697 BS |
124 | #endif |
125 | ||
e4c1112c AK |
126 | extern void radix__ptep_set_access_flags(struct vm_area_struct *vma, pte_t *ptep, |
127 | pte_t entry, unsigned long address, | |
128 | int psize); | |
044003b5 | 129 | |
c6d1a767 AK |
130 | static inline unsigned long __radix_pte_update(pte_t *ptep, unsigned long clr, |
131 | unsigned long set) | |
b0b5e9b1 | 132 | { |
85bcfaf6 NP |
133 | __be64 old_be, tmp_be; |
134 | ||
135 | __asm__ __volatile__( | |
136 | "1: ldarx %0,0,%3 # pte_update\n" | |
137 | " andc %1,%0,%5 \n" | |
138 | " or %1,%1,%4 \n" | |
139 | " stdcx. %1,0,%3 \n" | |
140 | " bne- 1b" | |
141 | : "=&r" (old_be), "=&r" (tmp_be), "=m" (*ptep) | |
142 | : "r" (ptep), "r" (cpu_to_be64(set)), "r" (cpu_to_be64(clr)) | |
143 | : "cc" ); | |
144 | ||
145 | return be64_to_cpu(old_be); | |
c6d1a767 AK |
146 | } |
147 | ||
c6d1a767 AK |
148 | static inline unsigned long radix__pte_update(struct mm_struct *mm, |
149 | unsigned long addr, | |
150 | pte_t *ptep, unsigned long clr, | |
151 | unsigned long set, | |
152 | int huge) | |
153 | { | |
154 | unsigned long old_pte; | |
155 | ||
2bf1071a | 156 | old_pte = __radix_pte_update(ptep, clr, set); |
b0b5e9b1 AK |
157 | if (!huge) |
158 | assert_pte_locked(mm, addr); | |
159 | ||
160 | return old_pte; | |
161 | } | |
162 | ||
f4894b80 AK |
163 | static inline pte_t radix__ptep_get_and_clear_full(struct mm_struct *mm, |
164 | unsigned long addr, | |
165 | pte_t *ptep, int full) | |
166 | { | |
167 | unsigned long old_pte; | |
168 | ||
169 | if (full) { | |
f569bd94 NP |
170 | old_pte = pte_val(*ptep); |
171 | *ptep = __pte(0); | |
f4894b80 AK |
172 | } else |
173 | old_pte = radix__pte_update(mm, addr, ptep, ~0ul, 0, 0); | |
174 | ||
175 | return __pte(old_pte); | |
176 | } | |
177 | ||
b0b5e9b1 AK |
178 | static inline int radix__pte_same(pte_t pte_a, pte_t pte_b) |
179 | { | |
180 | return ((pte_raw(pte_a) ^ pte_raw(pte_b)) == 0); | |
181 | } | |
182 | ||
183 | static inline int radix__pte_none(pte_t pte) | |
184 | { | |
185 | return (pte_val(pte) & ~RADIX_PTE_NONE_MASK) == 0; | |
186 | } | |
187 | ||
188 | static inline void radix__set_pte_at(struct mm_struct *mm, unsigned long addr, | |
189 | pte_t *ptep, pte_t pte, int percpu) | |
190 | { | |
191 | *ptep = pte; | |
f1cb8f9b NP |
192 | |
193 | /* | |
194 | * The architecture suggests a ptesync after setting the pte, which | |
195 | * orders the store that updates the pte with subsequent page table | |
196 | * walk accesses which may load the pte. Without this it may be | |
197 | * possible for a subsequent access to result in spurious fault. | |
198 | * | |
199 | * This is not necessary for correctness, because a spurious fault | |
200 | * is tolerated by the page fault handler, and this store will | |
201 | * eventually be seen. In testing, there was no noticable increase | |
202 | * in user faults on POWER9. Avoiding ptesync here is a significant | |
203 | * win for things like fork. If a future microarchitecture benefits | |
204 | * from ptesync, it should probably go into update_mmu_cache, rather | |
205 | * than set_pte_at (which is used to set ptes unrelated to faults). | |
206 | * | |
207 | * Spurious faults to vmalloc region are not tolerated, so there is | |
208 | * a ptesync in flush_cache_vmap. | |
209 | */ | |
b0b5e9b1 AK |
210 | } |
211 | ||
212 | static inline int radix__pmd_bad(pmd_t pmd) | |
213 | { | |
214 | return !!(pmd_val(pmd) & RADIX_PMD_BAD_BITS); | |
215 | } | |
216 | ||
217 | static inline int radix__pmd_same(pmd_t pmd_a, pmd_t pmd_b) | |
218 | { | |
219 | return ((pmd_raw(pmd_a) ^ pmd_raw(pmd_b)) == 0); | |
220 | } | |
221 | ||
222 | static inline int radix__pud_bad(pud_t pud) | |
223 | { | |
224 | return !!(pud_val(pud) & RADIX_PUD_BAD_BITS); | |
225 | } | |
226 | ||
227 | ||
228 | static inline int radix__pgd_bad(pgd_t pgd) | |
229 | { | |
230 | return !!(pgd_val(pgd) & RADIX_PGD_BAD_BITS); | |
231 | } | |
232 | ||
6cc1a0ee AK |
233 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
234 | ||
235 | static inline int radix__pmd_trans_huge(pmd_t pmd) | |
236 | { | |
ebd31197 | 237 | return (pmd_val(pmd) & (_PAGE_PTE | _PAGE_DEVMAP)) == _PAGE_PTE; |
6cc1a0ee AK |
238 | } |
239 | ||
bde3eb62 AK |
240 | static inline pmd_t radix__pmd_mkhuge(pmd_t pmd) |
241 | { | |
242 | return __pmd(pmd_val(pmd) | _PAGE_PTE); | |
243 | } | |
bde3eb62 AK |
244 | |
245 | extern unsigned long radix__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, | |
246 | pmd_t *pmdp, unsigned long clr, | |
247 | unsigned long set); | |
248 | extern pmd_t radix__pmdp_collapse_flush(struct vm_area_struct *vma, | |
249 | unsigned long address, pmd_t *pmdp); | |
250 | extern void radix__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, | |
251 | pgtable_t pgtable); | |
252 | extern pgtable_t radix__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); | |
253 | extern pmd_t radix__pmdp_huge_get_and_clear(struct mm_struct *mm, | |
254 | unsigned long addr, pmd_t *pmdp); | |
255 | extern int radix__has_transparent_hugepage(void); | |
6cc1a0ee AK |
256 | #endif |
257 | ||
d9225ad9 AK |
258 | extern int __meminit radix__vmemmap_create_mapping(unsigned long start, |
259 | unsigned long page_size, | |
260 | unsigned long phys); | |
261 | extern void radix__vmemmap_remove_mapping(unsigned long start, | |
262 | unsigned long page_size); | |
263 | ||
2bfd65e4 AK |
264 | extern int radix__map_kernel_page(unsigned long ea, unsigned long pa, |
265 | pgprot_t flags, unsigned int psz); | |
b23d9c5b AK |
266 | |
267 | static inline unsigned long radix__get_tree_size(void) | |
268 | { | |
269 | unsigned long rts_field; | |
270 | /* | |
694c4951 | 271 | * We support 52 bits, hence: |
2bf1071a | 272 | * bits 52 - 31 = 21, 0b10101 |
b23d9c5b AK |
273 | * RTS encoding details |
274 | * bits 0 - 3 of rts -> bits 6 - 8 unsigned long | |
275 | * bits 4 - 5 of rts -> bits 62 - 63 of unsigned long | |
276 | */ | |
2bf1071a NP |
277 | rts_field = (0x5UL << 5); /* 6 - 8 bits */ |
278 | rts_field |= (0x2UL << 61); | |
279 | ||
b23d9c5b AK |
280 | return rts_field; |
281 | } | |
6cc27341 RA |
282 | |
283 | #ifdef CONFIG_MEMORY_HOTPLUG | |
29ab6c47 | 284 | int radix__create_section_mapping(unsigned long start, unsigned long end, int nid); |
4b5d62ca | 285 | int radix__remove_section_mapping(unsigned long start, unsigned long end); |
6cc27341 | 286 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
b0b5e9b1 AK |
287 | #endif /* __ASSEMBLY__ */ |
288 | #endif |