1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2012 Regents of the University of California
4 */
5
6 #ifndef _ASM_RISCV_PGTABLE_64_H
7 #define _ASM_RISCV_PGTABLE_64_H
8
9 #include <linux/bits.h>
10 #include <linux/const.h>
11 #include <asm/errata_list.h>
12
13 extern bool pgtable_l4_enabled;
14 extern bool pgtable_l5_enabled;
15
16 #define PGDIR_SHIFT_L3 30
17 #define PGDIR_SHIFT_L4 39
18 #define PGDIR_SHIFT_L5 48
19 #define PGDIR_SIZE_L3 (_AC(1, UL) << PGDIR_SHIFT_L3)
20
21 #define PGDIR_SHIFT (pgtable_l5_enabled ? PGDIR_SHIFT_L5 : \
22 (pgtable_l4_enabled ? PGDIR_SHIFT_L4 : PGDIR_SHIFT_L3))
23 /* Size of region mapped by a page global directory */
24 #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
25 #define PGDIR_MASK (~(PGDIR_SIZE - 1))
26
27 /* p4d is folded into pgd in case of 4-level page table */
28 #define P4D_SHIFT_L3 30
29 #define P4D_SHIFT_L4 39
30 #define P4D_SHIFT_L5 39
31 #define P4D_SHIFT (pgtable_l5_enabled ? P4D_SHIFT_L5 : \
32 (pgtable_l4_enabled ? P4D_SHIFT_L4 : P4D_SHIFT_L3))
33 #define P4D_SIZE (_AC(1, UL) << P4D_SHIFT)
34 #define P4D_MASK (~(P4D_SIZE - 1))
35
36 /* pud is folded into pgd in case of 3-level page table */
37 #define PUD_SHIFT 30
38 #define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
39 #define PUD_MASK (~(PUD_SIZE - 1))
40
41 #define PMD_SHIFT 21
42 /* Size of region mapped by a page middle directory */
43 #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
44 #define PMD_MASK (~(PMD_SIZE - 1))
45
46 /* Page 4th Directory entry */
47 typedef struct {
48 unsigned long p4d;
49 } p4d_t;
50
51 #define p4d_val(x) ((x).p4d)
52 #define __p4d(x) ((p4d_t) { (x) })
53 #define PTRS_PER_P4D (PAGE_SIZE / sizeof(p4d_t))
54
55 /* Page Upper Directory entry */
56 typedef struct {
57 unsigned long pud;
58 } pud_t;
59
60 #define pud_val(x) ((x).pud)
61 #define __pud(x) ((pud_t) { (x) })
62 #define PTRS_PER_PUD (PAGE_SIZE / sizeof(pud_t))
63
64 /* Page Middle Directory entry */
65 typedef struct {
66 unsigned long pmd;
67 } pmd_t;
68
69 #define pmd_val(x) ((x).pmd)
70 #define __pmd(x) ((pmd_t) { (x) })
71
72 #define PTRS_PER_PMD (PAGE_SIZE / sizeof(pmd_t))
73
74 /*
75 * rv64 PTE format:
76 * | 63 | 62 61 | 60 54 | 53 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
77 * N MT RSV PFN reserved for SW D A G U X W R V
78 */
79 #define _PAGE_PFN_MASK GENMASK(53, 10)
80
81 /*
82 * [62:61] Svpbmt Memory Type definitions:
83 *
84 * 00 - PMA Normal Cacheable, No change to implied PMA memory type
85 * 01 - NC Non-cacheable, idempotent, weakly-ordered Main Memory
86 * 10 - IO Non-cacheable, non-idempotent, strongly-ordered I/O memory
87 * 11 - Rsvd Reserved for future standard use
88 */
89 #define _PAGE_NOCACHE_SVPBMT (1UL << 61)
90 #define _PAGE_IO_SVPBMT (1UL << 62)
91 #define _PAGE_MTMASK_SVPBMT (_PAGE_NOCACHE_SVPBMT | _PAGE_IO_SVPBMT)
92
93 /*
94 * [63:59] T-Head Memory Type definitions:
95 *
96 * 00000 - NC Weakly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
97 * 01110 - PMA Weakly-ordered, Cacheable, Bufferable, Shareable, Non-trustable
98 * 10000 - IO Strongly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
99 */
100 #define _PAGE_PMA_THEAD ((1UL << 62) | (1UL << 61) | (1UL << 60))
101 #define _PAGE_NOCACHE_THEAD 0UL
102 #define _PAGE_IO_THEAD (1UL << 63)
103 #define _PAGE_MTMASK_THEAD (_PAGE_PMA_THEAD | _PAGE_IO_THEAD | (1UL << 59))
104
riscv_page_mtmask(void)105 static inline u64 riscv_page_mtmask(void)
106 {
107 u64 val;
108
109 ALT_SVPBMT(val, _PAGE_MTMASK);
110 return val;
111 }
112
riscv_page_nocache(void)113 static inline u64 riscv_page_nocache(void)
114 {
115 u64 val;
116
117 ALT_SVPBMT(val, _PAGE_NOCACHE);
118 return val;
119 }
120
riscv_page_io(void)121 static inline u64 riscv_page_io(void)
122 {
123 u64 val;
124
125 ALT_SVPBMT(val, _PAGE_IO);
126 return val;
127 }
128
129 #define _PAGE_NOCACHE riscv_page_nocache()
130 #define _PAGE_IO riscv_page_io()
131 #define _PAGE_MTMASK riscv_page_mtmask()
132
133 /* Set of bits to preserve across pte_modify() */
134 #define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
135 _PAGE_WRITE | _PAGE_EXEC | \
136 _PAGE_USER | _PAGE_GLOBAL | \
137 _PAGE_MTMASK))
138
pud_present(pud_t pud)139 static inline int pud_present(pud_t pud)
140 {
141 return (pud_val(pud) & _PAGE_PRESENT);
142 }
143
pud_none(pud_t pud)144 static inline int pud_none(pud_t pud)
145 {
146 return (pud_val(pud) == 0);
147 }
148
pud_bad(pud_t pud)149 static inline int pud_bad(pud_t pud)
150 {
151 return !pud_present(pud);
152 }
153
154 #define pud_leaf pud_leaf
pud_leaf(pud_t pud)155 static inline int pud_leaf(pud_t pud)
156 {
157 return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
158 }
159
pud_user(pud_t pud)160 static inline int pud_user(pud_t pud)
161 {
162 return pud_val(pud) & _PAGE_USER;
163 }
164
set_pud(pud_t * pudp,pud_t pud)165 static inline void set_pud(pud_t *pudp, pud_t pud)
166 {
167 *pudp = pud;
168 }
169
pud_clear(pud_t * pudp)170 static inline void pud_clear(pud_t *pudp)
171 {
172 set_pud(pudp, __pud(0));
173 }
174
pfn_pud(unsigned long pfn,pgprot_t prot)175 static inline pud_t pfn_pud(unsigned long pfn, pgprot_t prot)
176 {
177 return __pud((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
178 }
179
_pud_pfn(pud_t pud)180 static inline unsigned long _pud_pfn(pud_t pud)
181 {
182 return __page_val_to_pfn(pud_val(pud));
183 }
184
pud_pgtable(pud_t pud)185 static inline pmd_t *pud_pgtable(pud_t pud)
186 {
187 return (pmd_t *)pfn_to_virt(__page_val_to_pfn(pud_val(pud)));
188 }
189
pud_page(pud_t pud)190 static inline struct page *pud_page(pud_t pud)
191 {
192 return pfn_to_page(__page_val_to_pfn(pud_val(pud)));
193 }
194
195 #define mm_p4d_folded mm_p4d_folded
mm_p4d_folded(struct mm_struct * mm)196 static inline bool mm_p4d_folded(struct mm_struct *mm)
197 {
198 if (pgtable_l5_enabled)
199 return false;
200
201 return true;
202 }
203
204 #define mm_pud_folded mm_pud_folded
mm_pud_folded(struct mm_struct * mm)205 static inline bool mm_pud_folded(struct mm_struct *mm)
206 {
207 if (pgtable_l4_enabled)
208 return false;
209
210 return true;
211 }
212
213 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
214
pfn_pmd(unsigned long pfn,pgprot_t prot)215 static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
216 {
217 unsigned long prot_val = pgprot_val(prot);
218
219 ALT_THEAD_PMA(prot_val);
220
221 return __pmd((pfn << _PAGE_PFN_SHIFT) | prot_val);
222 }
223
_pmd_pfn(pmd_t pmd)224 static inline unsigned long _pmd_pfn(pmd_t pmd)
225 {
226 return __page_val_to_pfn(pmd_val(pmd));
227 }
228
229 #define mk_pmd(page, prot) pfn_pmd(page_to_pfn(page), prot)
230
231 #define pmd_ERROR(e) \
232 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
233
234 #define pud_ERROR(e) \
235 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
236
237 #define p4d_ERROR(e) \
238 pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e))
239
set_p4d(p4d_t * p4dp,p4d_t p4d)240 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
241 {
242 if (pgtable_l4_enabled)
243 *p4dp = p4d;
244 else
245 set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
246 }
247
p4d_none(p4d_t p4d)248 static inline int p4d_none(p4d_t p4d)
249 {
250 if (pgtable_l4_enabled)
251 return (p4d_val(p4d) == 0);
252
253 return 0;
254 }
255
p4d_present(p4d_t p4d)256 static inline int p4d_present(p4d_t p4d)
257 {
258 if (pgtable_l4_enabled)
259 return (p4d_val(p4d) & _PAGE_PRESENT);
260
261 return 1;
262 }
263
p4d_bad(p4d_t p4d)264 static inline int p4d_bad(p4d_t p4d)
265 {
266 if (pgtable_l4_enabled)
267 return !p4d_present(p4d);
268
269 return 0;
270 }
271
p4d_clear(p4d_t * p4d)272 static inline void p4d_clear(p4d_t *p4d)
273 {
274 if (pgtable_l4_enabled)
275 set_p4d(p4d, __p4d(0));
276 }
277
pfn_p4d(unsigned long pfn,pgprot_t prot)278 static inline p4d_t pfn_p4d(unsigned long pfn, pgprot_t prot)
279 {
280 return __p4d((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
281 }
282
_p4d_pfn(p4d_t p4d)283 static inline unsigned long _p4d_pfn(p4d_t p4d)
284 {
285 return __page_val_to_pfn(p4d_val(p4d));
286 }
287
p4d_pgtable(p4d_t p4d)288 static inline pud_t *p4d_pgtable(p4d_t p4d)
289 {
290 if (pgtable_l4_enabled)
291 return (pud_t *)pfn_to_virt(__page_val_to_pfn(p4d_val(p4d)));
292
293 return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) });
294 }
295 #define p4d_page_vaddr(p4d) ((unsigned long)p4d_pgtable(p4d))
296
p4d_page(p4d_t p4d)297 static inline struct page *p4d_page(p4d_t p4d)
298 {
299 return pfn_to_page(__page_val_to_pfn(p4d_val(p4d)));
300 }
301
302 #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
303
304 #define pud_offset pud_offset
pud_offset(p4d_t * p4d,unsigned long address)305 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
306 {
307 if (pgtable_l4_enabled)
308 return p4d_pgtable(*p4d) + pud_index(address);
309
310 return (pud_t *)p4d;
311 }
312
set_pgd(pgd_t * pgdp,pgd_t pgd)313 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
314 {
315 if (pgtable_l5_enabled)
316 *pgdp = pgd;
317 else
318 set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
319 }
320
pgd_none(pgd_t pgd)321 static inline int pgd_none(pgd_t pgd)
322 {
323 if (pgtable_l5_enabled)
324 return (pgd_val(pgd) == 0);
325
326 return 0;
327 }
328
pgd_present(pgd_t pgd)329 static inline int pgd_present(pgd_t pgd)
330 {
331 if (pgtable_l5_enabled)
332 return (pgd_val(pgd) & _PAGE_PRESENT);
333
334 return 1;
335 }
336
pgd_bad(pgd_t pgd)337 static inline int pgd_bad(pgd_t pgd)
338 {
339 if (pgtable_l5_enabled)
340 return !pgd_present(pgd);
341
342 return 0;
343 }
344
pgd_clear(pgd_t * pgd)345 static inline void pgd_clear(pgd_t *pgd)
346 {
347 if (pgtable_l5_enabled)
348 set_pgd(pgd, __pgd(0));
349 }
350
pgd_pgtable(pgd_t pgd)351 static inline p4d_t *pgd_pgtable(pgd_t pgd)
352 {
353 if (pgtable_l5_enabled)
354 return (p4d_t *)pfn_to_virt(__page_val_to_pfn(pgd_val(pgd)));
355
356 return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) });
357 }
358 #define pgd_page_vaddr(pgd) ((unsigned long)pgd_pgtable(pgd))
359
pgd_page(pgd_t pgd)360 static inline struct page *pgd_page(pgd_t pgd)
361 {
362 return pfn_to_page(__page_val_to_pfn(pgd_val(pgd)));
363 }
364 #define pgd_page(pgd) pgd_page(pgd)
365
366 #define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
367
368 #define p4d_offset p4d_offset
p4d_offset(pgd_t * pgd,unsigned long address)369 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
370 {
371 if (pgtable_l5_enabled)
372 return pgd_pgtable(*pgd) + p4d_index(address);
373
374 return (p4d_t *)pgd;
375 }
376
377 #endif /* _ASM_RISCV_PGTABLE_64_H */
378