1 /* 2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Copyright 2003 PathScale, Inc. 4 * Derived from include/asm-i386/pgtable.h 5 * Licensed under the GPL 6 */ 7 8 #ifndef __UM_PGTABLE_H 9 #define __UM_PGTABLE_H 10 11 #include <asm/fixmap.h> 12 13 #define _PAGE_PRESENT 0x001 14 #define _PAGE_NEWPAGE 0x002 15 #define _PAGE_NEWPROT 0x004 16 #define _PAGE_RW 0x020 17 #define _PAGE_USER 0x040 18 #define _PAGE_ACCESSED 0x080 19 #define _PAGE_DIRTY 0x100 20 /* If _PAGE_PRESENT is clear, we use these: */ 21 #define _PAGE_FILE 0x008 /* nonlinear file mapping, saved PTE; unset:swap */ 22 #define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE; 23 pte_present gives true */ 24 25 #ifdef CONFIG_3_LEVEL_PGTABLES 26 #include <asm/pgtable-3level.h> 27 #else 28 #include <asm/pgtable-2level.h> 29 #endif 30 31 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 32 33 /* zero page used for uninitialized stuff */ 34 extern unsigned long *empty_zero_page; 35 36 #define pgtable_cache_init() do ; while (0) 37 38 /* Just any arbitrary offset to the start of the vmalloc VM area: the 39 * current 8MB value just means that there will be a 8MB "hole" after the 40 * physical memory until the kernel virtual memory starts. That means that 41 * any out-of-bounds memory accesses will hopefully be caught. 42 * The vmalloc() routines leaves a hole of 4kB between each vmalloced 43 * area for the same reason. ;) 44 */ 45 46 extern unsigned long end_iomem; 47 48 #define VMALLOC_OFFSET (__va_space) 49 #define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) 50 #define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK) 51 #ifdef CONFIG_HIGHMEM 52 # define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE) 53 #else 54 # define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) 55 #endif 56 #define MODULES_VADDR VMALLOC_START 57 #define MODULES_END VMALLOC_END 58 #define MODULES_LEN (MODULES_VADDR - MODULES_END) 59 60 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) 61 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) 62 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) 63 #define __PAGE_KERNEL_EXEC \ 64 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) 65 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) 66 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED) 67 #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) 68 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) 69 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) 70 #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC) 71 72 /* 73 * The i386 can't do page protection for execute, and considers that the same 74 * are read. 75 * Also, write permissions imply read permissions. This is the closest we can 76 * get.. 77 */ 78 #define __P000 PAGE_NONE 79 #define __P001 PAGE_READONLY 80 #define __P010 PAGE_COPY 81 #define __P011 PAGE_COPY 82 #define __P100 PAGE_READONLY 83 #define __P101 PAGE_READONLY 84 #define __P110 PAGE_COPY 85 #define __P111 PAGE_COPY 86 87 #define __S000 PAGE_NONE 88 #define __S001 PAGE_READONLY 89 #define __S010 PAGE_SHARED 90 #define __S011 PAGE_SHARED 91 #define __S100 PAGE_READONLY 92 #define __S101 PAGE_READONLY 93 #define __S110 PAGE_SHARED 94 #define __S111 PAGE_SHARED 95 96 /* 97 * ZERO_PAGE is a global shared page that is always zero: used 98 * for zero-mapped memory areas etc.. 99 */ 100 #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) 101 102 #define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE)) 103 104 #define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE)) 105 #define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) 106 107 #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) 108 #define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0) 109 110 #define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE) 111 #define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE) 112 113 #define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE) 114 #define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE) 115 116 #define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK) 117 118 #define pte_page(x) pfn_to_page(pte_pfn(x)) 119 120 #define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE)) 121 122 /* 123 * ================================= 124 * Flags checking section. 125 * ================================= 126 */ 127 128 static inline int pte_none(pte_t pte) 129 { 130 return pte_is_zero(pte); 131 } 132 133 /* 134 * The following only work if pte_present() is true. 135 * Undefined behaviour if not.. 136 */ 137 static inline int pte_read(pte_t pte) 138 { 139 return((pte_get_bits(pte, _PAGE_USER)) && 140 !(pte_get_bits(pte, _PAGE_PROTNONE))); 141 } 142 143 static inline int pte_exec(pte_t pte){ 144 return((pte_get_bits(pte, _PAGE_USER)) && 145 !(pte_get_bits(pte, _PAGE_PROTNONE))); 146 } 147 148 static inline int pte_write(pte_t pte) 149 { 150 return((pte_get_bits(pte, _PAGE_RW)) && 151 !(pte_get_bits(pte, _PAGE_PROTNONE))); 152 } 153 154 /* 155 * The following only works if pte_present() is not true. 156 */ 157 static inline int pte_file(pte_t pte) 158 { 159 return pte_get_bits(pte, _PAGE_FILE); 160 } 161 162 static inline int pte_dirty(pte_t pte) 163 { 164 return pte_get_bits(pte, _PAGE_DIRTY); 165 } 166 167 static inline int pte_young(pte_t pte) 168 { 169 return pte_get_bits(pte, _PAGE_ACCESSED); 170 } 171 172 static inline int pte_newpage(pte_t pte) 173 { 174 return pte_get_bits(pte, _PAGE_NEWPAGE); 175 } 176 177 static inline int pte_newprot(pte_t pte) 178 { 179 return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT))); 180 } 181 182 static inline int pte_special(pte_t pte) 183 { 184 return 0; 185 } 186 187 /* 188 * ================================= 189 * Flags setting section. 190 * ================================= 191 */ 192 193 static inline pte_t pte_mknewprot(pte_t pte) 194 { 195 pte_set_bits(pte, _PAGE_NEWPROT); 196 return(pte); 197 } 198 199 static inline pte_t pte_mkclean(pte_t pte) 200 { 201 pte_clear_bits(pte, _PAGE_DIRTY); 202 return(pte); 203 } 204 205 static inline pte_t pte_mkold(pte_t pte) 206 { 207 pte_clear_bits(pte, _PAGE_ACCESSED); 208 return(pte); 209 } 210 211 static inline pte_t pte_wrprotect(pte_t pte) 212 { 213 pte_clear_bits(pte, _PAGE_RW); 214 return(pte_mknewprot(pte)); 215 } 216 217 static inline pte_t pte_mkread(pte_t pte) 218 { 219 pte_set_bits(pte, _PAGE_USER); 220 return(pte_mknewprot(pte)); 221 } 222 223 static inline pte_t pte_mkdirty(pte_t pte) 224 { 225 pte_set_bits(pte, _PAGE_DIRTY); 226 return(pte); 227 } 228 229 static inline pte_t pte_mkyoung(pte_t pte) 230 { 231 pte_set_bits(pte, _PAGE_ACCESSED); 232 return(pte); 233 } 234 235 static inline pte_t pte_mkwrite(pte_t pte) 236 { 237 pte_set_bits(pte, _PAGE_RW); 238 return(pte_mknewprot(pte)); 239 } 240 241 static inline pte_t pte_mkuptodate(pte_t pte) 242 { 243 pte_clear_bits(pte, _PAGE_NEWPAGE); 244 if(pte_present(pte)) 245 pte_clear_bits(pte, _PAGE_NEWPROT); 246 return(pte); 247 } 248 249 static inline pte_t pte_mknewpage(pte_t pte) 250 { 251 pte_set_bits(pte, _PAGE_NEWPAGE); 252 return(pte); 253 } 254 255 static inline pte_t pte_mkspecial(pte_t pte) 256 { 257 return(pte); 258 } 259 260 static inline void set_pte(pte_t *pteptr, pte_t pteval) 261 { 262 pte_copy(*pteptr, pteval); 263 264 /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so 265 * fix_range knows to unmap it. _PAGE_NEWPROT is specific to 266 * mapped pages. 267 */ 268 269 *pteptr = pte_mknewpage(*pteptr); 270 if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr); 271 } 272 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 273 274 #define __HAVE_ARCH_PTE_SAME 275 static inline int pte_same(pte_t pte_a, pte_t pte_b) 276 { 277 return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE); 278 } 279 280 /* 281 * Conversion functions: convert a page and protection to a page entry, 282 * and a page entry and page directory to the page they refer to. 283 */ 284 285 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) 286 #define __virt_to_page(virt) phys_to_page(__pa(virt)) 287 #define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page)) 288 #define virt_to_page(addr) __virt_to_page((const unsigned long) addr) 289 290 #define mk_pte(page, pgprot) \ 291 ({ pte_t pte; \ 292 \ 293 pte_set_val(pte, page_to_phys(page), (pgprot)); \ 294 if (pte_present(pte)) \ 295 pte_mknewprot(pte_mknewpage(pte)); \ 296 pte;}) 297 298 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 299 { 300 pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot); 301 return pte; 302 } 303 304 /* 305 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] 306 * 307 * this macro returns the index of the entry in the pgd page which would 308 * control the given virtual address 309 */ 310 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) 311 312 /* 313 * pgd_offset() returns a (pgd_t *) 314 * pgd_index() is used get the offset into the pgd page's array of pgd_t's; 315 */ 316 #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) 317 318 /* 319 * a shortcut which implies the use of the kernel's pgd, instead 320 * of a process's 321 */ 322 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 323 324 /* 325 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] 326 * 327 * this macro returns the index of the entry in the pmd page which would 328 * control the given virtual address 329 */ 330 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) 331 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) 332 333 #define pmd_page_vaddr(pmd) \ 334 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) 335 336 /* 337 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] 338 * 339 * this macro returns the index of the entry in the pte page which would 340 * control the given virtual address 341 */ 342 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 343 #define pte_offset_kernel(dir, address) \ 344 ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address)) 345 #define pte_offset_map(dir, address) \ 346 ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address)) 347 #define pte_unmap(pte) do { } while (0) 348 349 struct mm_struct; 350 extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr); 351 352 #define update_mmu_cache(vma,address,ptep) do ; while (0) 353 354 /* Encode and de-code a swap entry */ 355 #define __swp_type(x) (((x).val >> 5) & 0x1f) 356 #define __swp_offset(x) ((x).val >> 11) 357 358 #define __swp_entry(type, offset) \ 359 ((swp_entry_t) { ((type) << 5) | ((offset) << 11) }) 360 #define __pte_to_swp_entry(pte) \ 361 ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) }) 362 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 363 364 #define kern_addr_valid(addr) (1) 365 366 #include <asm-generic/pgtable.h> 367 368 /* Clear a kernel PTE and flush it from the TLB */ 369 #define kpte_clear_flush(ptep, vaddr) \ 370 do { \ 371 pte_clear(&init_mm, (vaddr), (ptep)); \ 372 __flush_tlb_one((vaddr)); \ 373 } while (0) 374 375 #endif 376