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) /* pte_present() check */ 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 32 /* 33 * VMALLOC and SPARSEMEM_VMEMMAP ranges. 34 */ 35 #define VMALLOC_START UL(0xffffff8000000000) 36 #define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K) 37 38 #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) 39 40 #define FIRST_USER_ADDRESS 0 41 42 #ifndef __ASSEMBLY__ 43 extern void __pte_error(const char *file, int line, unsigned long val); 44 extern void __pmd_error(const char *file, int line, unsigned long val); 45 extern void __pgd_error(const char *file, int line, unsigned long val); 46 47 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) 48 #ifndef CONFIG_ARM64_64K_PAGES 49 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) 50 #endif 51 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) 52 53 /* 54 * The pgprot_* and protection_map entries will be fixed up at runtime to 55 * include the cachable and bufferable bits based on memory policy, as well as 56 * any architecture dependent bits like global/ASID and SMP shared mapping 57 * bits. 58 */ 59 #define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF 60 61 extern pgprot_t pgprot_default; 62 63 #define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b)) 64 65 #define PAGE_NONE _MOD_PROT(pgprot_default, PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 66 #define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 67 #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN) 68 #define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 69 #define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 70 #define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 71 #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 72 #define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY) 73 #define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY) 74 75 #define __PAGE_NONE __pgprot(_PAGE_DEFAULT | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 76 #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) 77 #define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) 78 #define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 79 #define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 80 #define __PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY) 81 #define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY) 82 83 #endif /* __ASSEMBLY__ */ 84 85 #define __P000 __PAGE_NONE 86 #define __P001 __PAGE_READONLY 87 #define __P010 __PAGE_COPY 88 #define __P011 __PAGE_COPY 89 #define __P100 __PAGE_READONLY_EXEC 90 #define __P101 __PAGE_READONLY_EXEC 91 #define __P110 __PAGE_COPY_EXEC 92 #define __P111 __PAGE_COPY_EXEC 93 94 #define __S000 __PAGE_NONE 95 #define __S001 __PAGE_READONLY 96 #define __S010 __PAGE_SHARED 97 #define __S011 __PAGE_SHARED 98 #define __S100 __PAGE_READONLY_EXEC 99 #define __S101 __PAGE_READONLY_EXEC 100 #define __S110 __PAGE_SHARED_EXEC 101 #define __S111 __PAGE_SHARED_EXEC 102 103 #ifndef __ASSEMBLY__ 104 /* 105 * ZERO_PAGE is a global shared page that is always zero: used 106 * for zero-mapped memory areas etc.. 107 */ 108 extern struct page *empty_zero_page; 109 #define ZERO_PAGE(vaddr) (empty_zero_page) 110 111 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) 112 113 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) 114 115 #define pte_none(pte) (!pte_val(pte)) 116 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) 117 #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 118 #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) 119 120 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 121 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) 122 #define pte_unmap(pte) do { } while (0) 123 #define pte_unmap_nested(pte) do { } while (0) 124 125 /* 126 * The following only work if pte_present(). Undefined behaviour otherwise. 127 */ 128 #define pte_present(pte) (pte_val(pte) & PTE_VALID) 129 #define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY) 130 #define pte_young(pte) (pte_val(pte) & PTE_AF) 131 #define pte_special(pte) (pte_val(pte) & PTE_SPECIAL) 132 #define pte_write(pte) (!(pte_val(pte) & PTE_RDONLY)) 133 #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) 134 135 #define pte_present_exec_user(pte) \ 136 ((pte_val(pte) & (PTE_VALID | PTE_USER | PTE_UXN)) == \ 137 (PTE_VALID | PTE_USER)) 138 139 #define PTE_BIT_FUNC(fn,op) \ 140 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; } 141 142 PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY); 143 PTE_BIT_FUNC(mkwrite, &= ~PTE_RDONLY); 144 PTE_BIT_FUNC(mkclean, &= ~PTE_DIRTY); 145 PTE_BIT_FUNC(mkdirty, |= PTE_DIRTY); 146 PTE_BIT_FUNC(mkold, &= ~PTE_AF); 147 PTE_BIT_FUNC(mkyoung, |= PTE_AF); 148 PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL); 149 150 static inline void set_pte(pte_t *ptep, pte_t pte) 151 { 152 *ptep = pte; 153 } 154 155 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); 156 157 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 158 pte_t *ptep, pte_t pte) 159 { 160 if (pte_present_exec_user(pte)) 161 __sync_icache_dcache(pte, addr); 162 if (!pte_dirty(pte)) 163 pte = pte_wrprotect(pte); 164 set_pte(ptep, pte); 165 } 166 167 /* 168 * Huge pte definitions. 169 */ 170 #define pte_huge(pte) ((pte_val(pte) & PTE_TYPE_MASK) == PTE_TYPE_HUGEPAGE) 171 #define pte_mkhuge(pte) (__pte((pte_val(pte) & ~PTE_TYPE_MASK) | PTE_TYPE_HUGEPAGE)) 172 173 #define __pgprot_modify(prot,mask,bits) \ 174 __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) 175 176 #define __HAVE_ARCH_PTE_SPECIAL 177 178 /* 179 * Mark the prot value as uncacheable and unbufferable. 180 */ 181 #define pgprot_noncached(prot) \ 182 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE)) 183 #define pgprot_writecombine(prot) \ 184 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE)) 185 #define pgprot_dmacoherent(prot) \ 186 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC)) 187 #define __HAVE_PHYS_MEM_ACCESS_PROT 188 struct file; 189 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 190 unsigned long size, pgprot_t vma_prot); 191 192 #define pmd_none(pmd) (!pmd_val(pmd)) 193 #define pmd_present(pmd) (pmd_val(pmd)) 194 195 #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) 196 197 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 198 { 199 *pmdp = pmd; 200 dsb(); 201 } 202 203 static inline void pmd_clear(pmd_t *pmdp) 204 { 205 set_pmd(pmdp, __pmd(0)); 206 } 207 208 static inline pte_t *pmd_page_vaddr(pmd_t pmd) 209 { 210 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); 211 } 212 213 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) 214 215 /* 216 * Conversion functions: convert a page and protection to a page entry, 217 * and a page entry and page directory to the page they refer to. 218 */ 219 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) 220 221 #ifndef CONFIG_ARM64_64K_PAGES 222 223 #define pud_none(pud) (!pud_val(pud)) 224 #define pud_bad(pud) (!(pud_val(pud) & 2)) 225 #define pud_present(pud) (pud_val(pud)) 226 227 static inline void set_pud(pud_t *pudp, pud_t pud) 228 { 229 *pudp = pud; 230 dsb(); 231 } 232 233 static inline void pud_clear(pud_t *pudp) 234 { 235 set_pud(pudp, __pud(0)); 236 } 237 238 static inline pmd_t *pud_page_vaddr(pud_t pud) 239 { 240 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); 241 } 242 243 #endif /* CONFIG_ARM64_64K_PAGES */ 244 245 /* to find an entry in a page-table-directory */ 246 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 247 248 #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr)) 249 250 /* to find an entry in a kernel page-table-directory */ 251 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) 252 253 /* Find an entry in the second-level page table.. */ 254 #ifndef CONFIG_ARM64_64K_PAGES 255 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 256 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) 257 { 258 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); 259 } 260 #endif 261 262 /* Find an entry in the third-level page table.. */ 263 #define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 264 265 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 266 { 267 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY; 268 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); 269 return pte; 270 } 271 272 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 273 extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; 274 275 #define SWAPPER_DIR_SIZE (3 * PAGE_SIZE) 276 #define IDMAP_DIR_SIZE (2 * PAGE_SIZE) 277 278 /* 279 * Encode and decode a swap entry: 280 * bits 0-1: present (must be zero) 281 * bit 2: PTE_FILE 282 * bits 3-8: swap type 283 * bits 9-63: swap offset 284 */ 285 #define __SWP_TYPE_SHIFT 3 286 #define __SWP_TYPE_BITS 6 287 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) 288 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) 289 290 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 291 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) 292 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) 293 294 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 295 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) 296 297 /* 298 * Ensure that there are not more swap files than can be encoded in the kernel 299 * the PTEs. 300 */ 301 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) 302 303 /* 304 * Encode and decode a file entry: 305 * bits 0-1: present (must be zero) 306 * bit 2: PTE_FILE 307 * bits 3-63: file offset / PAGE_SIZE 308 */ 309 #define pte_file(pte) (pte_val(pte) & PTE_FILE) 310 #define pte_to_pgoff(x) (pte_val(x) >> 3) 311 #define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE) 312 313 #define PTE_FILE_MAX_BITS 61 314 315 extern int kern_addr_valid(unsigned long addr); 316 317 #include <asm-generic/pgtable.h> 318 319 /* 320 * remap a physical page `pfn' of size `size' with page protection `prot' 321 * into virtual address `from' 322 */ 323 #define io_remap_pfn_range(vma,from,pfn,size,prot) \ 324 remap_pfn_range(vma, from, pfn, size, prot) 325 326 #define pgtable_cache_init() do { } while (0) 327 328 #endif /* !__ASSEMBLY__ */ 329 330 #endif /* __ASM_PGTABLE_H */ 331