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 * [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 92 enum 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)) 142 143 static inline u64 riscv_page_mtmask(void) 144 { 145 u64 val; 146 147 ALT_SVPBMT(val, _PAGE_MTMASK); 148 return val; 149 } 150 151 static inline u64 riscv_page_nocache(void) 152 { 153 u64 val; 154 155 ALT_SVPBMT(val, _PAGE_NOCACHE); 156 return val; 157 } 158 159 static 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)) 176 177 static inline int pud_present(pud_t pud) 178 { 179 return (pud_val(pud) & _PAGE_PRESENT); 180 } 181 182 static inline int pud_none(pud_t pud) 183 { 184 return (pud_val(pud) == 0); 185 } 186 187 static inline int pud_bad(pud_t pud) 188 { 189 return !pud_present(pud); 190 } 191 192 #define pud_leaf pud_leaf 193 static inline int pud_leaf(pud_t pud) 194 { 195 return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF); 196 } 197 198 static inline int pud_user(pud_t pud) 199 { 200 return pud_val(pud) & _PAGE_USER; 201 } 202 203 static inline void set_pud(pud_t *pudp, pud_t pud) 204 { 205 WRITE_ONCE(*pudp, pud); 206 } 207 208 static inline void pud_clear(pud_t *pudp) 209 { 210 set_pud(pudp, __pud(0)); 211 } 212 213 static inline pud_t pfn_pud(unsigned long pfn, pgprot_t prot) 214 { 215 return __pud((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot)); 216 } 217 218 static inline unsigned long _pud_pfn(pud_t pud) 219 { 220 return __page_val_to_pfn(pud_val(pud)); 221 } 222 223 static inline pmd_t *pud_pgtable(pud_t pud) 224 { 225 return (pmd_t *)pfn_to_virt(__page_val_to_pfn(pud_val(pud))); 226 } 227 228 static 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 234 static 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 243 static 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)) 252 253 static 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 } 261 262 static inline unsigned long _pmd_pfn(pmd_t pmd) 263 { 264 return __page_val_to_pfn(pmd_val(pmd)); 265 } 266 267 #define mk_pmd(page, prot) pfn_pmd(page_to_pfn(page), prot) 268 269 #define pmd_ERROR(e) \ 270 pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e)) 271 272 #define pud_ERROR(e) \ 273 pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e)) 274 275 #define p4d_ERROR(e) \ 276 pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e)) 277 278 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d) 279 { 280 if (pgtable_l4_enabled) 281 WRITE_ONCE(*p4dp, p4d); 282 else 283 set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) }); 284 } 285 286 static inline int p4d_none(p4d_t p4d) 287 { 288 if (pgtable_l4_enabled) 289 return (p4d_val(p4d) == 0); 290 291 return 0; 292 } 293 294 static inline int p4d_present(p4d_t p4d) 295 { 296 if (pgtable_l4_enabled) 297 return (p4d_val(p4d) & _PAGE_PRESENT); 298 299 return 1; 300 } 301 302 static inline int p4d_bad(p4d_t p4d) 303 { 304 if (pgtable_l4_enabled) 305 return !p4d_present(p4d); 306 307 return 0; 308 } 309 310 static inline void p4d_clear(p4d_t *p4d) 311 { 312 if (pgtable_l4_enabled) 313 set_p4d(p4d, __p4d(0)); 314 } 315 316 static inline p4d_t pfn_p4d(unsigned long pfn, pgprot_t prot) 317 { 318 return __p4d((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot)); 319 } 320 321 static inline unsigned long _p4d_pfn(p4d_t p4d) 322 { 323 return __page_val_to_pfn(p4d_val(p4d)); 324 } 325 326 static inline pud_t *p4d_pgtable(p4d_t p4d) 327 { 328 if (pgtable_l4_enabled) 329 return (pud_t *)pfn_to_virt(__page_val_to_pfn(p4d_val(p4d))); 330 331 return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) }); 332 } 333 #define p4d_page_vaddr(p4d) ((unsigned long)p4d_pgtable(p4d)) 334 335 static inline struct page *p4d_page(p4d_t p4d) 336 { 337 return pfn_to_page(__page_val_to_pfn(p4d_val(p4d))); 338 } 339 340 #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) 341 342 #define pud_offset pud_offset 343 pud_t *pud_offset(p4d_t *p4d, unsigned long address); 344 345 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd) 346 { 347 if (pgtable_l5_enabled) 348 WRITE_ONCE(*pgdp, pgd); 349 else 350 set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) }); 351 } 352 353 static inline int pgd_none(pgd_t pgd) 354 { 355 if (pgtable_l5_enabled) 356 return (pgd_val(pgd) == 0); 357 358 return 0; 359 } 360 361 static inline int pgd_present(pgd_t pgd) 362 { 363 if (pgtable_l5_enabled) 364 return (pgd_val(pgd) & _PAGE_PRESENT); 365 366 return 1; 367 } 368 369 static inline int pgd_bad(pgd_t pgd) 370 { 371 if (pgtable_l5_enabled) 372 return !pgd_present(pgd); 373 374 return 0; 375 } 376 377 static inline void pgd_clear(pgd_t *pgd) 378 { 379 if (pgtable_l5_enabled) 380 set_pgd(pgd, __pgd(0)); 381 } 382 383 static inline p4d_t *pgd_pgtable(pgd_t pgd) 384 { 385 if (pgtable_l5_enabled) 386 return (p4d_t *)pfn_to_virt(__page_val_to_pfn(pgd_val(pgd))); 387 388 return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) }); 389 } 390 #define pgd_page_vaddr(pgd) ((unsigned long)pgd_pgtable(pgd)) 391 392 static inline struct page *pgd_page(pgd_t pgd) 393 { 394 return pfn_to_page(__page_val_to_pfn(pgd_val(pgd))); 395 } 396 #define pgd_page(pgd) pgd_page(pgd) 397 398 #define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1)) 399 400 #define p4d_offset p4d_offset 401 p4d_t *p4d_offset(pgd_t *pgd, unsigned long address); 402 403 #endif /* _ASM_RISCV_PGTABLE_64_H */ 404