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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
13extern bool pgtable_l4_enabled;
14extern 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_SHIFT (pgtable_l5_enabled ? PGDIR_SHIFT_L5 : \
20 (pgtable_l4_enabled ? PGDIR_SHIFT_L4 : PGDIR_SHIFT_L3))
21/* Size of region mapped by a page global directory */
22#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
23#define PGDIR_MASK (~(PGDIR_SIZE - 1))
24
25/* p4d is folded into pgd in case of 4-level page table */
26#define P4D_SHIFT_L3 30
27#define P4D_SHIFT_L4 39
28#define P4D_SHIFT_L5 39
29#define P4D_SHIFT (pgtable_l5_enabled ? P4D_SHIFT_L5 : \
30 (pgtable_l4_enabled ? P4D_SHIFT_L4 : P4D_SHIFT_L3))
31#define P4D_SIZE (_AC(1, UL) << P4D_SHIFT)
32#define P4D_MASK (~(P4D_SIZE - 1))
33
34/* pud is folded into pgd in case of 3-level page table */
35#define PUD_SHIFT 30
36#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
37#define PUD_MASK (~(PUD_SIZE - 1))
38
39#define PMD_SHIFT 21
40/* Size of region mapped by a page middle directory */
41#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
42#define PMD_MASK (~(PMD_SIZE - 1))
43
44/* Page 4th Directory entry */
45typedef struct {
46 unsigned long p4d;
47} p4d_t;
48
49#define p4d_val(x) ((x).p4d)
50#define __p4d(x) ((p4d_t) { (x) })
51#define PTRS_PER_P4D (PAGE_SIZE / sizeof(p4d_t))
52
53/* Page Upper Directory entry */
54typedef struct {
55 unsigned long pud;
56} pud_t;
57
58#define pud_val(x) ((x).pud)
59#define __pud(x) ((pud_t) { (x) })
60#define PTRS_PER_PUD (PAGE_SIZE / sizeof(pud_t))
61
62/* Page Middle Directory entry */
63typedef struct {
64 unsigned long pmd;
65} pmd_t;
66
67#define pmd_val(x) ((x).pmd)
68#define __pmd(x) ((pmd_t) { (x) })
69
70#define PTRS_PER_PMD (PAGE_SIZE / sizeof(pmd_t))
71
72#define MAX_POSSIBLE_PHYSMEM_BITS 56
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 * [63] Svnapot definitions:
83 * 0 Svnapot disabled
84 * 1 Svnapot enabled
85 */
86#define _PAGE_NAPOT_SHIFT 63
87#define _PAGE_NAPOT BIT(_PAGE_NAPOT_SHIFT)
88/*
89 * Only 64KB (order 4) napot ptes supported.
90 */
91#define NAPOT_CONT_ORDER_BASE 4
92enum napot_cont_order {
93 NAPOT_CONT64KB_ORDER = NAPOT_CONT_ORDER_BASE,
94 NAPOT_ORDER_MAX,
95};
96
97#define for_each_napot_order(order) \
98 for (order = NAPOT_CONT_ORDER_BASE; order < NAPOT_ORDER_MAX; order++)
99#define for_each_napot_order_rev(order) \
100 for (order = NAPOT_ORDER_MAX - 1; \
101 order >= NAPOT_CONT_ORDER_BASE; order--)
102#define napot_cont_order(val) (__builtin_ctzl((val.pte >> _PAGE_PFN_SHIFT) << 1))
103
104#define napot_cont_shift(order) ((order) + PAGE_SHIFT)
105#define napot_cont_size(order) BIT(napot_cont_shift(order))
106#define napot_cont_mask(order) (~(napot_cont_size(order) - 1UL))
107#define napot_pte_num(order) BIT(order)
108
109#ifdef CONFIG_RISCV_ISA_SVNAPOT
110#define HUGE_MAX_HSTATE (2 + (NAPOT_ORDER_MAX - NAPOT_CONT_ORDER_BASE))
111#else
112#define HUGE_MAX_HSTATE 2
113#endif
114
115/*
116 * [62:61] Svpbmt Memory Type definitions:
117 *
118 * 00 - PMA Normal Cacheable, No change to implied PMA memory type
119 * 01 - NC Non-cacheable, idempotent, weakly-ordered Main Memory
120 * 10 - IO Non-cacheable, non-idempotent, strongly-ordered I/O memory
121 * 11 - Rsvd Reserved for future standard use
122 */
123#define _PAGE_NOCACHE_SVPBMT (1UL << 61)
124#define _PAGE_IO_SVPBMT (1UL << 62)
125#define _PAGE_MTMASK_SVPBMT (_PAGE_NOCACHE_SVPBMT | _PAGE_IO_SVPBMT)
126
127/*
128 * [63:59] T-Head Memory Type definitions:
129 * bit[63] SO - Strong Order
130 * bit[62] C - Cacheable
131 * bit[61] B - Bufferable
132 * bit[60] SH - Shareable
133 * bit[59] Sec - Trustable
134 * 00110 - NC Weakly-ordered, Non-cacheable, Bufferable, Shareable, Non-trustable
135 * 01110 - PMA Weakly-ordered, Cacheable, Bufferable, Shareable, Non-trustable
136 * 10010 - IO Strongly-ordered, Non-cacheable, Non-bufferable, Shareable, Non-trustable
137 */
138#define _PAGE_PMA_THEAD ((1UL << 62) | (1UL << 61) | (1UL << 60))
139#define _PAGE_NOCACHE_THEAD ((1UL << 61) | (1UL << 60))
140#define _PAGE_IO_THEAD ((1UL << 63) | (1UL << 60))
141#define _PAGE_MTMASK_THEAD (_PAGE_PMA_THEAD | _PAGE_IO_THEAD | (1UL << 59))
142
143static inline u64 riscv_page_mtmask(void)
144{
145 u64 val;
146
147 ALT_SVPBMT(val, _PAGE_MTMASK);
148 return val;
149}
150
151static inline u64 riscv_page_nocache(void)
152{
153 u64 val;
154
155 ALT_SVPBMT(val, _PAGE_NOCACHE);
156 return val;
157}
158
159static inline u64 riscv_page_io(void)
160{
161 u64 val;
162
163 ALT_SVPBMT(val, _PAGE_IO);
164 return val;
165}
166
167#define _PAGE_NOCACHE riscv_page_nocache()
168#define _PAGE_IO riscv_page_io()
169#define _PAGE_MTMASK riscv_page_mtmask()
170
171/* Set of bits to preserve across pte_modify() */
172#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
173 _PAGE_WRITE | _PAGE_EXEC | \
174 _PAGE_USER | _PAGE_GLOBAL | \
175 _PAGE_MTMASK))
176
177static inline int pud_present(pud_t pud)
178{
179 return (pud_val(pud) & _PAGE_PRESENT);
180}
181
182static inline int pud_none(pud_t pud)
183{
184 return (pud_val(pud) == 0);
185}
186
187static inline int pud_bad(pud_t pud)
188{
189 return !pud_present(pud) || (pud_val(pud) & _PAGE_LEAF);
190}
191
192#define pud_leaf pud_leaf
193static inline bool pud_leaf(pud_t pud)
194{
195 return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
196}
197
198static inline int pud_user(pud_t pud)
199{
200 return pud_val(pud) & _PAGE_USER;
201}
202
203static inline void set_pud(pud_t *pudp, pud_t pud)
204{
205 WRITE_ONCE(*pudp, pud);
206}
207
208static inline void pud_clear(pud_t *pudp)
209{
210 set_pud(pudp, __pud(0));
211}
212
213static inline pud_t pfn_pud(unsigned long pfn, pgprot_t prot)
214{
215 return __pud((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
216}
217
218static inline unsigned long _pud_pfn(pud_t pud)
219{
220 return __page_val_to_pfn(pud_val(pud));
221}
222
223static inline pmd_t *pud_pgtable(pud_t pud)
224{
225 return (pmd_t *)pfn_to_virt(__page_val_to_pfn(pud_val(pud)));
226}
227
228static inline struct page *pud_page(pud_t pud)
229{
230 return pfn_to_page(__page_val_to_pfn(pud_val(pud)));
231}
232
233#define mm_p4d_folded mm_p4d_folded
234static inline bool mm_p4d_folded(struct mm_struct *mm)
235{
236 if (pgtable_l5_enabled)
237 return false;
238
239 return true;
240}
241
242#define mm_pud_folded mm_pud_folded
243static inline bool mm_pud_folded(struct mm_struct *mm)
244{
245 if (pgtable_l4_enabled)
246 return false;
247
248 return true;
249}
250
251#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
252
253static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
254{
255 unsigned long prot_val = pgprot_val(prot);
256
257 ALT_THEAD_PMA(prot_val);
258
259 return __pmd((pfn << _PAGE_PFN_SHIFT) | prot_val);
260}
261
262static inline unsigned long _pmd_pfn(pmd_t pmd)
263{
264 return __page_val_to_pfn(pmd_val(pmd));
265}
266
267#define pmd_ERROR(e) \
268 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
269
270#define pud_ERROR(e) \
271 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
272
273#define p4d_ERROR(e) \
274 pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e))
275
276static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
277{
278 if (pgtable_l4_enabled)
279 WRITE_ONCE(*p4dp, p4d);
280 else
281 set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
282}
283
284static inline int p4d_none(p4d_t p4d)
285{
286 if (pgtable_l4_enabled)
287 return (p4d_val(p4d) == 0);
288
289 return 0;
290}
291
292static inline int p4d_present(p4d_t p4d)
293{
294 if (pgtable_l4_enabled)
295 return (p4d_val(p4d) & _PAGE_PRESENT);
296
297 return 1;
298}
299
300static inline int p4d_bad(p4d_t p4d)
301{
302 if (pgtable_l4_enabled)
303 return !p4d_present(p4d);
304
305 return 0;
306}
307
308static inline void p4d_clear(p4d_t *p4d)
309{
310 if (pgtable_l4_enabled)
311 set_p4d(p4d, __p4d(0));
312}
313
314static inline p4d_t pfn_p4d(unsigned long pfn, pgprot_t prot)
315{
316 return __p4d((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
317}
318
319static inline unsigned long _p4d_pfn(p4d_t p4d)
320{
321 return __page_val_to_pfn(p4d_val(p4d));
322}
323
324static inline pud_t *p4d_pgtable(p4d_t p4d)
325{
326 if (pgtable_l4_enabled)
327 return (pud_t *)pfn_to_virt(__page_val_to_pfn(p4d_val(p4d)));
328
329 return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) });
330}
331#define p4d_page_vaddr(p4d) ((unsigned long)p4d_pgtable(p4d))
332
333static inline struct page *p4d_page(p4d_t p4d)
334{
335 return pfn_to_page(__page_val_to_pfn(p4d_val(p4d)));
336}
337
338#define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
339
340#define pud_offset pud_offset
341pud_t *pud_offset(p4d_t *p4d, unsigned long address);
342
343static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
344{
345 if (pgtable_l5_enabled)
346 WRITE_ONCE(*pgdp, pgd);
347 else
348 set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
349}
350
351static inline int pgd_none(pgd_t pgd)
352{
353 if (pgtable_l5_enabled)
354 return (pgd_val(pgd) == 0);
355
356 return 0;
357}
358
359static inline int pgd_present(pgd_t pgd)
360{
361 if (pgtable_l5_enabled)
362 return (pgd_val(pgd) & _PAGE_PRESENT);
363
364 return 1;
365}
366
367static inline int pgd_bad(pgd_t pgd)
368{
369 if (pgtable_l5_enabled)
370 return !pgd_present(pgd);
371
372 return 0;
373}
374
375static inline void pgd_clear(pgd_t *pgd)
376{
377 if (pgtable_l5_enabled)
378 set_pgd(pgd, __pgd(0));
379}
380
381static inline p4d_t *pgd_pgtable(pgd_t pgd)
382{
383 if (pgtable_l5_enabled)
384 return (p4d_t *)pfn_to_virt(__page_val_to_pfn(pgd_val(pgd)));
385
386 return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) });
387}
388#define pgd_page_vaddr(pgd) ((unsigned long)pgd_pgtable(pgd))
389
390static inline struct page *pgd_page(pgd_t pgd)
391{
392 return pfn_to_page(__page_val_to_pfn(pgd_val(pgd)));
393}
394#define pgd_page(pgd) pgd_page(pgd)
395
396#define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
397
398#define p4d_offset p4d_offset
399p4d_t *p4d_offset(pgd_t *pgd, unsigned long address);
400
401#ifdef CONFIG_TRANSPARENT_HUGEPAGE
402static inline pte_t pmd_pte(pmd_t pmd);
403static inline pte_t pud_pte(pud_t pud);
404#endif
405
406#endif /* _ASM_RISCV_PGTABLE_64_H */