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_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */ 29 #define PTE_DIRTY (_AT(pteval_t, 1) << 55) 30 #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) 31 /* bit 57 for PMD_SECT_SPLITTING */ 32 #define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */ 33 34 /* 35 * VMALLOC and SPARSEMEM_VMEMMAP ranges. 36 */ 37 #define VMALLOC_START (UL(0xffffffffffffffff) << VA_BITS) 38 #define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K) 39 40 #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) 41 42 #define FIRST_USER_ADDRESS 0 43 44 #ifndef __ASSEMBLY__ 45 extern void __pte_error(const char *file, int line, unsigned long val); 46 extern void __pmd_error(const char *file, int line, unsigned long val); 47 extern void __pgd_error(const char *file, int line, unsigned long val); 48 49 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) 50 #ifndef CONFIG_ARM64_64K_PAGES 51 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) 52 #endif 53 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) 54 55 /* 56 * The pgprot_* and protection_map entries will be fixed up at runtime to 57 * include the cachable and bufferable bits based on memory policy, as well as 58 * any architecture dependent bits like global/ASID and SMP shared mapping 59 * bits. 60 */ 61 #define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF 62 63 extern pgprot_t pgprot_default; 64 65 #define __pgprot_modify(prot,mask,bits) \ 66 __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) 67 68 #define _MOD_PROT(p, b) __pgprot_modify(p, 0, b) 69 70 #define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN) 71 #define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 72 #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN) 73 #define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 74 #define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 75 #define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 76 #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 77 #define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY) 78 #define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY) 79 80 #define PAGE_HYP _MOD_PROT(pgprot_default, PTE_HYP) 81 #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP) 82 83 #define PAGE_S2 __pgprot_modify(pgprot_default, PTE_S2_MEMATTR_MASK, PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY) 84 #define PAGE_S2_DEVICE __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN) 85 86 #define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN) 87 #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 88 #define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) 89 #define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 90 #define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 91 #define __PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 92 #define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 93 94 #endif /* __ASSEMBLY__ */ 95 96 #define __P000 __PAGE_NONE 97 #define __P001 __PAGE_READONLY 98 #define __P010 __PAGE_COPY 99 #define __P011 __PAGE_COPY 100 #define __P100 __PAGE_READONLY_EXEC 101 #define __P101 __PAGE_READONLY_EXEC 102 #define __P110 __PAGE_COPY_EXEC 103 #define __P111 __PAGE_COPY_EXEC 104 105 #define __S000 __PAGE_NONE 106 #define __S001 __PAGE_READONLY 107 #define __S010 __PAGE_SHARED 108 #define __S011 __PAGE_SHARED 109 #define __S100 __PAGE_READONLY_EXEC 110 #define __S101 __PAGE_READONLY_EXEC 111 #define __S110 __PAGE_SHARED_EXEC 112 #define __S111 __PAGE_SHARED_EXEC 113 114 #ifndef __ASSEMBLY__ 115 /* 116 * ZERO_PAGE is a global shared page that is always zero: used 117 * for zero-mapped memory areas etc.. 118 */ 119 extern struct page *empty_zero_page; 120 #define ZERO_PAGE(vaddr) (empty_zero_page) 121 122 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) 123 124 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 125 126 #define pte_none(pte) (!pte_val(pte)) 127 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) 128 #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 129 #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + pte_index(addr)) 130 131 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 132 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) 133 #define pte_unmap(pte) do { } while (0) 134 #define pte_unmap_nested(pte) do { } while (0) 135 136 /* 137 * The following only work if pte_present(). Undefined behaviour otherwise. 138 */ 139 #define pte_present(pte) (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) 140 #define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY) 141 #define pte_young(pte) (pte_val(pte) & PTE_AF) 142 #define pte_special(pte) (pte_val(pte) & PTE_SPECIAL) 143 #define pte_write(pte) (!(pte_val(pte) & PTE_RDONLY)) 144 #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) 145 146 #define pte_valid_user(pte) \ 147 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) 148 149 #define PTE_BIT_FUNC(fn,op) \ 150 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; } 151 152 PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY); 153 PTE_BIT_FUNC(mkwrite, &= ~PTE_RDONLY); 154 PTE_BIT_FUNC(mkclean, &= ~PTE_DIRTY); 155 PTE_BIT_FUNC(mkdirty, |= PTE_DIRTY); 156 PTE_BIT_FUNC(mkold, &= ~PTE_AF); 157 PTE_BIT_FUNC(mkyoung, |= PTE_AF); 158 PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL); 159 160 static inline void set_pte(pte_t *ptep, pte_t pte) 161 { 162 *ptep = pte; 163 } 164 165 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); 166 167 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 168 pte_t *ptep, pte_t pte) 169 { 170 if (pte_valid_user(pte)) { 171 if (pte_exec(pte)) 172 __sync_icache_dcache(pte, addr); 173 if (!pte_dirty(pte)) 174 pte = pte_wrprotect(pte); 175 } 176 177 set_pte(ptep, pte); 178 } 179 180 /* 181 * Huge pte definitions. 182 */ 183 #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) 184 #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) 185 186 /* 187 * Hugetlb definitions. 188 */ 189 #define HUGE_MAX_HSTATE 2 190 #define HPAGE_SHIFT PMD_SHIFT 191 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 192 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 193 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 194 195 #define __HAVE_ARCH_PTE_SPECIAL 196 197 /* 198 * Software PMD bits for THP 199 */ 200 201 #define PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55) 202 #define PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 57) 203 204 /* 205 * THP definitions. 206 */ 207 #define pmd_young(pmd) (pmd_val(pmd) & PMD_SECT_AF) 208 209 #define __HAVE_ARCH_PMD_WRITE 210 #define pmd_write(pmd) (!(pmd_val(pmd) & PMD_SECT_RDONLY)) 211 212 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 213 #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) 214 #define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING) 215 #endif 216 217 #define PMD_BIT_FUNC(fn,op) \ 218 static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; } 219 220 PMD_BIT_FUNC(wrprotect, |= PMD_SECT_RDONLY); 221 PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF); 222 PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING); 223 PMD_BIT_FUNC(mkwrite, &= ~PMD_SECT_RDONLY); 224 PMD_BIT_FUNC(mkdirty, |= PMD_SECT_DIRTY); 225 PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF); 226 PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK); 227 228 #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) 229 230 #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) 231 #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 232 #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) 233 234 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 235 236 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 237 { 238 const pmdval_t mask = PMD_SECT_USER | PMD_SECT_PXN | PMD_SECT_UXN | 239 PMD_SECT_RDONLY | PMD_SECT_PROT_NONE | 240 PMD_SECT_VALID; 241 pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask); 242 return pmd; 243 } 244 245 #define set_pmd_at(mm, addr, pmdp, pmd) set_pmd(pmdp, pmd) 246 247 static inline int has_transparent_hugepage(void) 248 { 249 return 1; 250 } 251 252 /* 253 * Mark the prot value as uncacheable and unbufferable. 254 */ 255 #define pgprot_noncached(prot) \ 256 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE)) 257 #define pgprot_writecombine(prot) \ 258 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC)) 259 #define pgprot_dmacoherent(prot) \ 260 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC)) 261 #define __HAVE_PHYS_MEM_ACCESS_PROT 262 struct file; 263 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 264 unsigned long size, pgprot_t vma_prot); 265 266 #define pmd_none(pmd) (!pmd_val(pmd)) 267 #define pmd_present(pmd) (pmd_val(pmd)) 268 269 #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) 270 271 #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 272 PMD_TYPE_TABLE) 273 #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 274 PMD_TYPE_SECT) 275 276 277 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 278 { 279 *pmdp = pmd; 280 dsb(); 281 } 282 283 static inline void pmd_clear(pmd_t *pmdp) 284 { 285 set_pmd(pmdp, __pmd(0)); 286 } 287 288 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 289 { 290 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 291 } 292 293 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 294 295 /* 296 * Conversion functions: convert a page and protection to a page entry, 297 * and a page entry and page directory to the page they refer to. 298 */ 299 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) 300 301 #ifndef CONFIG_ARM64_64K_PAGES 302 303 #define pud_none(pud) (!pud_val(pud)) 304 #define pud_bad(pud) (!(pud_val(pud) & 2)) 305 #define pud_present(pud) (pud_val(pud)) 306 307 static inline void set_pud(pud_t *pudp, pud_t pud) 308 { 309 *pudp = pud; 310 dsb(); 311 } 312 313 static inline void pud_clear(pud_t *pudp) 314 { 315 set_pud(pudp, __pud(0)); 316 } 317 318 static inline pmd_t *pud_page_vaddr(pud_t pud) 319 { 320 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); 321 } 322 323 #endif /* CONFIG_ARM64_64K_PAGES */ 324 325 /* to find an entry in a page-table-directory */ 326 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 327 328 #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr)) 329 330 /* to find an entry in a kernel page-table-directory */ 331 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) 332 333 /* Find an entry in the second-level page table.. */ 334 #ifndef CONFIG_ARM64_64K_PAGES 335 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 336 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) 337 { 338 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); 339 } 340 #endif 341 342 /* Find an entry in the third-level page table.. */ 343 #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 344 345 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 346 { 347 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | 348 PTE_PROT_NONE | PTE_VALID; 349 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); 350 return pte; 351 } 352 353 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 354 extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; 355 356 #define SWAPPER_DIR_SIZE (3 * PAGE_SIZE) 357 #define IDMAP_DIR_SIZE (2 * PAGE_SIZE) 358 359 /* 360 * Encode and decode a swap entry: 361 * bits 0-1: present (must be zero) 362 * bit 2: PTE_FILE 363 * bits 3-8: swap type 364 * bits 9-57: swap offset 365 */ 366 #define __SWP_TYPE_SHIFT 3 367 #define __SWP_TYPE_BITS 6 368 #define __SWP_OFFSET_BITS 49 369 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) 370 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) 371 #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) 372 373 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 374 #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) 375 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) 376 377 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 378 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) 379 380 /* 381 * Ensure that there are not more swap files than can be encoded in the kernel 382 * the PTEs. 383 */ 384 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) 385 386 /* 387 * Encode and decode a file entry: 388 * bits 0-1: present (must be zero) 389 * bit 2: PTE_FILE 390 * bits 3-57: file offset / PAGE_SIZE 391 */ 392 #define pte_file(pte) (pte_val(pte) & PTE_FILE) 393 #define pte_to_pgoff(x) (pte_val(x) >> 3) 394 #define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE) 395 396 #define PTE_FILE_MAX_BITS 55 397 398 extern int kern_addr_valid(unsigned long addr); 399 400 #include <asm-generic/pgtable.h> 401 402 #define pgtable_cache_init() do { } while (0) 403 404 #endif /* !__ASSEMBLY__ */ 405 406 #endif /* __ASM_PGTABLE_H */ 407