1 /* 2 * Copyright (C) 2012 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 #ifndef __ASM_PGTABLE_H 17 #define __ASM_PGTABLE_H 18 19 #include <asm/proc-fns.h> 20 21 #include <asm/memory.h> 22 #include <asm/pgtable-hwdef.h> 23 24 /* 25 * Software defined PTE bits definition. 26 */ 27 #define PTE_VALID (_AT(pteval_t, 1) << 0) 28 #define PTE_PROT_NONE (_AT(pteval_t, 1) << 2) /* only when !PTE_VALID */ 29 #define PTE_FILE (_AT(pteval_t, 1) << 3) /* only when !pte_present() */ 30 #define PTE_DIRTY (_AT(pteval_t, 1) << 55) 31 #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) 32 33 /* 34 * VMALLOC and SPARSEMEM_VMEMMAP ranges. 35 */ 36 #define VMALLOC_START (UL(0xffffffffffffffff) << VA_BITS) 37 #define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K) 38 39 #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) 40 41 #define FIRST_USER_ADDRESS 0 42 43 #ifndef __ASSEMBLY__ 44 extern void __pte_error(const char *file, int line, unsigned long val); 45 extern void __pmd_error(const char *file, int line, unsigned long val); 46 extern void __pgd_error(const char *file, int line, unsigned long val); 47 48 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) 49 #ifndef CONFIG_ARM64_64K_PAGES 50 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) 51 #endif 52 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) 53 54 /* 55 * The pgprot_* and protection_map entries will be fixed up at runtime to 56 * include the cachable and bufferable bits based on memory policy, as well as 57 * any architecture dependent bits like global/ASID and SMP shared mapping 58 * bits. 59 */ 60 #define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF 61 62 extern pgprot_t pgprot_default; 63 64 #define __pgprot_modify(prot,mask,bits) \ 65 __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) 66 67 #define _MOD_PROT(p, b) __pgprot_modify(p, 0, b) 68 69 #define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN) 70 #define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 71 #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN) 72 #define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 73 #define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 74 #define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 75 #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 76 #define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY) 77 #define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY) 78 79 #define PAGE_HYP _MOD_PROT(pgprot_default, PTE_HYP) 80 #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP) 81 82 #define PAGE_S2 __pgprot_modify(pgprot_default, PTE_S2_MEMATTR_MASK, PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY) 83 #define PAGE_S2_DEVICE __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN) 84 85 #define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN) 86 #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 87 #define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) 88 #define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 89 #define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 90 #define __PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 91 #define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 92 93 #endif /* __ASSEMBLY__ */ 94 95 #define __P000 __PAGE_NONE 96 #define __P001 __PAGE_READONLY 97 #define __P010 __PAGE_COPY 98 #define __P011 __PAGE_COPY 99 #define __P100 __PAGE_READONLY_EXEC 100 #define __P101 __PAGE_READONLY_EXEC 101 #define __P110 __PAGE_COPY_EXEC 102 #define __P111 __PAGE_COPY_EXEC 103 104 #define __S000 __PAGE_NONE 105 #define __S001 __PAGE_READONLY 106 #define __S010 __PAGE_SHARED 107 #define __S011 __PAGE_SHARED 108 #define __S100 __PAGE_READONLY_EXEC 109 #define __S101 __PAGE_READONLY_EXEC 110 #define __S110 __PAGE_SHARED_EXEC 111 #define __S111 __PAGE_SHARED_EXEC 112 113 #ifndef __ASSEMBLY__ 114 /* 115 * ZERO_PAGE is a global shared page that is always zero: used 116 * for zero-mapped memory areas etc.. 117 */ 118 extern struct page *empty_zero_page; 119 #define ZERO_PAGE(vaddr) (empty_zero_page) 120 121 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) 122 123 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 124 125 #define pte_none(pte) (!pte_val(pte)) 126 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) 127 #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 128 #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + pte_index(addr)) 129 130 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 131 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) 132 #define pte_unmap(pte) do { } while (0) 133 #define pte_unmap_nested(pte) do { } while (0) 134 135 /* 136 * The following only work if pte_present(). Undefined behaviour otherwise. 137 */ 138 #define pte_present(pte) (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) 139 #define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY) 140 #define pte_young(pte) (pte_val(pte) & PTE_AF) 141 #define pte_special(pte) (pte_val(pte) & PTE_SPECIAL) 142 #define pte_write(pte) (!(pte_val(pte) & PTE_RDONLY)) 143 #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) 144 145 #define pte_valid_user(pte) \ 146 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) 147 148 #define PTE_BIT_FUNC(fn,op) \ 149 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; } 150 151 PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY); 152 PTE_BIT_FUNC(mkwrite, &= ~PTE_RDONLY); 153 PTE_BIT_FUNC(mkclean, &= ~PTE_DIRTY); 154 PTE_BIT_FUNC(mkdirty, |= PTE_DIRTY); 155 PTE_BIT_FUNC(mkold, &= ~PTE_AF); 156 PTE_BIT_FUNC(mkyoung, |= PTE_AF); 157 PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL); 158 159 static inline void set_pte(pte_t *ptep, pte_t pte) 160 { 161 *ptep = pte; 162 } 163 164 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); 165 166 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 167 pte_t *ptep, pte_t pte) 168 { 169 if (pte_valid_user(pte)) { 170 if (pte_exec(pte)) 171 __sync_icache_dcache(pte, addr); 172 if (!pte_dirty(pte)) 173 pte = pte_wrprotect(pte); 174 } 175 176 set_pte(ptep, pte); 177 } 178 179 /* 180 * Huge pte definitions. 181 */ 182 #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) 183 #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) 184 185 /* 186 * Hugetlb definitions. 187 */ 188 #define HUGE_MAX_HSTATE 2 189 #define HPAGE_SHIFT PMD_SHIFT 190 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 191 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 192 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 193 194 #define __HAVE_ARCH_PTE_SPECIAL 195 196 /* 197 * Software PMD bits for THP 198 */ 199 200 #define PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55) 201 #define PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 57) 202 203 /* 204 * THP definitions. 205 */ 206 #define pmd_young(pmd) (pmd_val(pmd) & PMD_SECT_AF) 207 208 #define __HAVE_ARCH_PMD_WRITE 209 #define pmd_write(pmd) (!(pmd_val(pmd) & PMD_SECT_RDONLY)) 210 211 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 212 #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) 213 #define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING) 214 #endif 215 216 #define PMD_BIT_FUNC(fn,op) \ 217 static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; } 218 219 PMD_BIT_FUNC(wrprotect, |= PMD_SECT_RDONLY); 220 PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF); 221 PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING); 222 PMD_BIT_FUNC(mkwrite, &= ~PMD_SECT_RDONLY); 223 PMD_BIT_FUNC(mkdirty, |= PMD_SECT_DIRTY); 224 PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF); 225 PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK); 226 227 #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) 228 229 #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) 230 #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 231 #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) 232 233 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 234 235 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 236 { 237 const pmdval_t mask = PMD_SECT_USER | PMD_SECT_PXN | PMD_SECT_UXN | 238 PMD_SECT_RDONLY | PMD_SECT_PROT_NONE | 239 PMD_SECT_VALID; 240 pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask); 241 return pmd; 242 } 243 244 #define set_pmd_at(mm, addr, pmdp, pmd) set_pmd(pmdp, pmd) 245 246 static inline int has_transparent_hugepage(void) 247 { 248 return 1; 249 } 250 251 /* 252 * Mark the prot value as uncacheable and unbufferable. 253 */ 254 #define pgprot_noncached(prot) \ 255 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE)) 256 #define pgprot_writecombine(prot) \ 257 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE)) 258 #define pgprot_dmacoherent(prot) \ 259 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC)) 260 #define __HAVE_PHYS_MEM_ACCESS_PROT 261 struct file; 262 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 263 unsigned long size, pgprot_t vma_prot); 264 265 #define pmd_none(pmd) (!pmd_val(pmd)) 266 #define pmd_present(pmd) (pmd_val(pmd)) 267 268 #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) 269 270 #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 271 PMD_TYPE_TABLE) 272 #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 273 PMD_TYPE_SECT) 274 275 276 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 277 { 278 *pmdp = pmd; 279 dsb(); 280 } 281 282 static inline void pmd_clear(pmd_t *pmdp) 283 { 284 set_pmd(pmdp, __pmd(0)); 285 } 286 287 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 288 { 289 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 290 } 291 292 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 293 294 /* 295 * Conversion functions: convert a page and protection to a page entry, 296 * and a page entry and page directory to the page they refer to. 297 */ 298 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) 299 300 #ifndef CONFIG_ARM64_64K_PAGES 301 302 #define pud_none(pud) (!pud_val(pud)) 303 #define pud_bad(pud) (!(pud_val(pud) & 2)) 304 #define pud_present(pud) (pud_val(pud)) 305 306 static inline void set_pud(pud_t *pudp, pud_t pud) 307 { 308 *pudp = pud; 309 dsb(); 310 } 311 312 static inline void pud_clear(pud_t *pudp) 313 { 314 set_pud(pudp, __pud(0)); 315 } 316 317 static inline pmd_t *pud_page_vaddr(pud_t pud) 318 { 319 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); 320 } 321 322 #endif /* CONFIG_ARM64_64K_PAGES */ 323 324 /* to find an entry in a page-table-directory */ 325 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 326 327 #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr)) 328 329 /* to find an entry in a kernel page-table-directory */ 330 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) 331 332 /* Find an entry in the second-level page table.. */ 333 #ifndef CONFIG_ARM64_64K_PAGES 334 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 335 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) 336 { 337 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); 338 } 339 #endif 340 341 /* Find an entry in the third-level page table.. */ 342 #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 343 344 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 345 { 346 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | 347 PTE_PROT_NONE | PTE_VALID; 348 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); 349 return pte; 350 } 351 352 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 353 extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; 354 355 #define SWAPPER_DIR_SIZE (3 * PAGE_SIZE) 356 #define IDMAP_DIR_SIZE (2 * PAGE_SIZE) 357 358 /* 359 * Encode and decode a swap entry: 360 * bits 0, 2: present (must both be zero) 361 * bit 3: PTE_FILE 362 * bits 4-8: swap type 363 * bits 9-63: swap offset 364 */ 365 #define __SWP_TYPE_SHIFT 4 366 #define __SWP_TYPE_BITS 6 367 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) 368 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) 369 370 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 371 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) 372 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) 373 374 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 375 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) 376 377 /* 378 * Ensure that there are not more swap files than can be encoded in the kernel 379 * the PTEs. 380 */ 381 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) 382 383 /* 384 * Encode and decode a file entry: 385 * bits 0, 2: present (must both be zero) 386 * bit 3: PTE_FILE 387 * bits 4-63: file offset / PAGE_SIZE 388 */ 389 #define pte_file(pte) (pte_val(pte) & PTE_FILE) 390 #define pte_to_pgoff(x) (pte_val(x) >> 4) 391 #define pgoff_to_pte(x) __pte(((x) << 4) | PTE_FILE) 392 393 #define PTE_FILE_MAX_BITS 60 394 395 extern int kern_addr_valid(unsigned long addr); 396 397 #include <asm-generic/pgtable.h> 398 399 #define pgtable_cache_init() do { } while (0) 400 401 #endif /* !__ASSEMBLY__ */ 402 403 #endif /* __ASM_PGTABLE_H */ 404