1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012 Regents of the University of California
6 #ifndef _ASM_RISCV_PGTABLE_64_H
7 #define _ASM_RISCV_PGTABLE_64_H
9 #include <linux/bits.h>
10 #include <linux/const.h>
11 #include <asm/errata_list.h>
13 extern bool pgtable_l4_enabled;
14 extern bool pgtable_l5_enabled;
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)
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))
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))
36 /* pud is folded into pgd in case of 3-level page table */
38 #define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
39 #define PUD_MASK (~(PUD_SIZE - 1))
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))
46 /* Page 4th Directory entry */
51 #define p4d_val(x) ((x).p4d)
52 #define __p4d(x) ((p4d_t) { (x) })
53 #define PTRS_PER_P4D (PAGE_SIZE / sizeof(p4d_t))
55 /* Page Upper Directory entry */
60 #define pud_val(x) ((x).pud)
61 #define __pud(x) ((pud_t) { (x) })
62 #define PTRS_PER_PUD (PAGE_SIZE / sizeof(pud_t))
64 /* Page Middle Directory entry */
69 #define pmd_val(x) ((x).pmd)
70 #define __pmd(x) ((pmd_t) { (x) })
72 #define PTRS_PER_PMD (PAGE_SIZE / sizeof(pmd_t))
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
79 #define _PAGE_PFN_MASK GENMASK(53, 10)
82 * [62:61] Svpbmt Memory Type definitions:
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
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)
94 * [63:59] T-Head Memory Type definitions:
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
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))
105 static inline u64 riscv_page_mtmask(void)
109 ALT_SVPBMT(val, _PAGE_MTMASK);
113 static inline u64 riscv_page_nocache(void)
117 ALT_SVPBMT(val, _PAGE_NOCACHE);
121 static inline u64 riscv_page_io(void)
125 ALT_SVPBMT(val, _PAGE_IO);
129 #define _PAGE_NOCACHE riscv_page_nocache()
130 #define _PAGE_IO riscv_page_io()
131 #define _PAGE_MTMASK riscv_page_mtmask()
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 | \
139 static inline int pud_present(pud_t pud)
141 return (pud_val(pud) & _PAGE_PRESENT);
144 static inline int pud_none(pud_t pud)
146 return (pud_val(pud) == 0);
149 static inline int pud_bad(pud_t pud)
151 return !pud_present(pud);
154 #define pud_leaf pud_leaf
155 static inline int pud_leaf(pud_t pud)
157 return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
160 static inline int pud_user(pud_t pud)
162 return pud_val(pud) & _PAGE_USER;
165 static inline void set_pud(pud_t *pudp, pud_t pud)
170 static inline void pud_clear(pud_t *pudp)
172 set_pud(pudp, __pud(0));
175 static inline pud_t pfn_pud(unsigned long pfn, pgprot_t prot)
177 return __pud((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
180 static inline unsigned long _pud_pfn(pud_t pud)
182 return __page_val_to_pfn(pud_val(pud));
185 static inline pmd_t *pud_pgtable(pud_t pud)
187 return (pmd_t *)pfn_to_virt(__page_val_to_pfn(pud_val(pud)));
190 static inline struct page *pud_page(pud_t pud)
192 return pfn_to_page(__page_val_to_pfn(pud_val(pud)));
195 #define mm_p4d_folded mm_p4d_folded
196 static inline bool mm_p4d_folded(struct mm_struct *mm)
198 if (pgtable_l5_enabled)
204 #define mm_pud_folded mm_pud_folded
205 static inline bool mm_pud_folded(struct mm_struct *mm)
207 if (pgtable_l4_enabled)
213 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
215 static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
217 unsigned long prot_val = pgprot_val(prot);
219 ALT_THEAD_PMA(prot_val);
221 return __pmd((pfn << _PAGE_PFN_SHIFT) | prot_val);
224 static inline unsigned long _pmd_pfn(pmd_t pmd)
226 return __page_val_to_pfn(pmd_val(pmd));
229 #define mk_pmd(page, prot) pfn_pmd(page_to_pfn(page), prot)
231 #define pmd_ERROR(e) \
232 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
234 #define pud_ERROR(e) \
235 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
237 #define p4d_ERROR(e) \
238 pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e))
240 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
242 if (pgtable_l4_enabled)
245 set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
248 static inline int p4d_none(p4d_t p4d)
250 if (pgtable_l4_enabled)
251 return (p4d_val(p4d) == 0);
256 static inline int p4d_present(p4d_t p4d)
258 if (pgtable_l4_enabled)
259 return (p4d_val(p4d) & _PAGE_PRESENT);
264 static inline int p4d_bad(p4d_t p4d)
266 if (pgtable_l4_enabled)
267 return !p4d_present(p4d);
272 static inline void p4d_clear(p4d_t *p4d)
274 if (pgtable_l4_enabled)
275 set_p4d(p4d, __p4d(0));
278 static inline p4d_t pfn_p4d(unsigned long pfn, pgprot_t prot)
280 return __p4d((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
283 static inline unsigned long _p4d_pfn(p4d_t p4d)
285 return __page_val_to_pfn(p4d_val(p4d));
288 static inline pud_t *p4d_pgtable(p4d_t p4d)
290 if (pgtable_l4_enabled)
291 return (pud_t *)pfn_to_virt(__page_val_to_pfn(p4d_val(p4d)));
293 return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) });
295 #define p4d_page_vaddr(p4d) ((unsigned long)p4d_pgtable(p4d))
297 static inline struct page *p4d_page(p4d_t p4d)
299 return pfn_to_page(__page_val_to_pfn(p4d_val(p4d)));
302 #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
304 #define pud_offset pud_offset
305 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
307 if (pgtable_l4_enabled)
308 return p4d_pgtable(*p4d) + pud_index(address);
313 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
315 if (pgtable_l5_enabled)
318 set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
321 static inline int pgd_none(pgd_t pgd)
323 if (pgtable_l5_enabled)
324 return (pgd_val(pgd) == 0);
329 static inline int pgd_present(pgd_t pgd)
331 if (pgtable_l5_enabled)
332 return (pgd_val(pgd) & _PAGE_PRESENT);
337 static inline int pgd_bad(pgd_t pgd)
339 if (pgtable_l5_enabled)
340 return !pgd_present(pgd);
345 static inline void pgd_clear(pgd_t *pgd)
347 if (pgtable_l5_enabled)
348 set_pgd(pgd, __pgd(0));
351 static inline p4d_t *pgd_pgtable(pgd_t pgd)
353 if (pgtable_l5_enabled)
354 return (p4d_t *)pfn_to_virt(__page_val_to_pfn(pgd_val(pgd)));
356 return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) });
358 #define pgd_page_vaddr(pgd) ((unsigned long)pgd_pgtable(pgd))
360 static inline struct page *pgd_page(pgd_t pgd)
362 return pfn_to_page(__page_val_to_pfn(pgd_val(pgd)));
364 #define pgd_page(pgd) pgd_page(pgd)
366 #define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
368 #define p4d_offset p4d_offset
369 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
371 if (pgtable_l5_enabled)
372 return pgd_pgtable(*pgd) + p4d_index(address);
377 #endif /* _ASM_RISCV_PGTABLE_64_H */