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