1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2003 Ralf Baechle 7 */ 8#ifndef _ASM_PGTABLE_H 9#define _ASM_PGTABLE_H 10 11#ifdef CONFIG_32BIT 12#include <asm/pgtable-32.h> 13#endif 14#ifdef CONFIG_64BIT 15#include <asm/pgtable-64.h> 16#endif 17 18#include <asm/io.h> 19#include <asm/pgtable-bits.h> 20 21struct mm_struct; 22struct vm_area_struct; 23 24#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT) 25#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 26 PAGE_CACHABLE_DEFAULT) 27#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ 28 PAGE_CACHABLE_DEFAULT) 29#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \ 30 PAGE_CACHABLE_DEFAULT) 31#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 32 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT) 33#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 34 PAGE_CACHABLE_DEFAULT) 35#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \ 36 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED) 37 38/* 39 * MIPS can't do page protection for execute, and considers that the same like 40 * read. Also, write permissions imply read permissions. This is the closest 41 * we can get by reasonable means.. 42 */ 43#define __P000 PAGE_NONE 44#define __P001 PAGE_READONLY 45#define __P010 PAGE_COPY 46#define __P011 PAGE_COPY 47#define __P100 PAGE_READONLY 48#define __P101 PAGE_READONLY 49#define __P110 PAGE_COPY 50#define __P111 PAGE_COPY 51 52#define __S000 PAGE_NONE 53#define __S001 PAGE_READONLY 54#define __S010 PAGE_SHARED 55#define __S011 PAGE_SHARED 56#define __S100 PAGE_READONLY 57#define __S101 PAGE_READONLY 58#define __S110 PAGE_SHARED 59#define __S111 PAGE_SHARED 60 61/* 62 * ZERO_PAGE is a global shared page that is always zero; used 63 * for zero-mapped memory areas etc.. 64 */ 65 66extern unsigned long empty_zero_page; 67extern unsigned long zero_page_mask; 68 69#define ZERO_PAGE(vaddr) \ 70 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))) 71 72extern void paging_init(void); 73 74/* 75 * Conversion functions: convert a page and protection to a page entry, 76 * and a page entry and page directory to the page they refer to. 77 */ 78#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd)) 79#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) 80#define pmd_page_vaddr(pmd) pmd_val(pmd) 81 82#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) 83 84#define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) 85#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) 86 87static inline void set_pte(pte_t *ptep, pte_t pte) 88{ 89 ptep->pte_high = pte.pte_high; 90 smp_wmb(); 91 ptep->pte_low = pte.pte_low; 92 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low); 93 94 if (pte.pte_low & _PAGE_GLOBAL) { 95 pte_t *buddy = ptep_buddy(ptep); 96 /* 97 * Make sure the buddy is global too (if it's !none, 98 * it better already be global) 99 */ 100 if (pte_none(*buddy)) { 101 buddy->pte_low |= _PAGE_GLOBAL; 102 buddy->pte_high |= _PAGE_GLOBAL; 103 } 104 } 105} 106#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 107 108static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 109{ 110 pte_t null = __pte(0); 111 112 /* Preserve global status for the pair */ 113 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) 114 null.pte_low = null.pte_high = _PAGE_GLOBAL; 115 116 set_pte_at(mm, addr, ptep, null); 117} 118#else 119 120#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) 121#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) 122 123/* 124 * Certain architectures need to do special things when pte's 125 * within a page table are directly modified. Thus, the following 126 * hook is made available. 127 */ 128static inline void set_pte(pte_t *ptep, pte_t pteval) 129{ 130 *ptep = pteval; 131#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 132 if (pte_val(pteval) & _PAGE_GLOBAL) { 133 pte_t *buddy = ptep_buddy(ptep); 134 /* 135 * Make sure the buddy is global too (if it's !none, 136 * it better already be global) 137 */ 138 if (pte_none(*buddy)) 139 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; 140 } 141#endif 142} 143#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 144 145static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 146{ 147#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX) 148 /* Preserve global status for the pair */ 149 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL) 150 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL)); 151 else 152#endif 153 set_pte_at(mm, addr, ptep, __pte(0)); 154} 155#endif 156 157/* 158 * (pmds are folded into puds so this doesn't get actually called, 159 * but the define is needed for a generic inline function.) 160 */ 161#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0) 162 163#ifdef CONFIG_64BIT 164/* 165 * (puds are folded into pgds so this doesn't get actually called, 166 * but the define is needed for a generic inline function.) 167 */ 168#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 169#endif 170 171#define PGD_T_LOG2 ffz(~sizeof(pgd_t)) 172#define PMD_T_LOG2 ffz(~sizeof(pmd_t)) 173#define PTE_T_LOG2 ffz(~sizeof(pte_t)) 174 175extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 176 177/* 178 * The following only work if pte_present() is true. 179 * Undefined behaviour if not.. 180 */ 181static inline int pte_user(pte_t pte) { BUG(); return 0; } 182#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) 183static inline int pte_read(pte_t pte) { return pte.pte_low & _PAGE_READ; } 184static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; } 185static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; } 186static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } 187static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; } 188 189static inline pte_t pte_wrprotect(pte_t pte) 190{ 191 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 192 pte.pte_high &= ~_PAGE_SILENT_WRITE; 193 return pte; 194} 195 196static inline pte_t pte_rdprotect(pte_t pte) 197{ 198 pte.pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ); 199 pte.pte_high &= ~_PAGE_SILENT_READ; 200 return pte; 201} 202 203static inline pte_t pte_mkclean(pte_t pte) 204{ 205 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); 206 pte.pte_high &= ~_PAGE_SILENT_WRITE; 207 return pte; 208} 209 210static inline pte_t pte_mkold(pte_t pte) 211{ 212 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); 213 pte.pte_high &= ~_PAGE_SILENT_READ; 214 return pte; 215} 216 217static inline pte_t pte_mkwrite(pte_t pte) 218{ 219 pte.pte_low |= _PAGE_WRITE; 220 if (pte.pte_low & _PAGE_MODIFIED) { 221 pte.pte_low |= _PAGE_SILENT_WRITE; 222 pte.pte_high |= _PAGE_SILENT_WRITE; 223 } 224 return pte; 225} 226 227static inline pte_t pte_mkread(pte_t pte) 228{ 229 pte.pte_low |= _PAGE_READ; 230 if (pte.pte_low & _PAGE_ACCESSED) { 231 pte.pte_low |= _PAGE_SILENT_READ; 232 pte.pte_high |= _PAGE_SILENT_READ; 233 } 234 return pte; 235} 236 237static inline pte_t pte_mkdirty(pte_t pte) 238{ 239 pte.pte_low |= _PAGE_MODIFIED; 240 if (pte.pte_low & _PAGE_WRITE) { 241 pte.pte_low |= _PAGE_SILENT_WRITE; 242 pte.pte_high |= _PAGE_SILENT_WRITE; 243 } 244 return pte; 245} 246 247static inline pte_t pte_mkyoung(pte_t pte) 248{ 249 pte.pte_low |= _PAGE_ACCESSED; 250 if (pte.pte_low & _PAGE_READ) 251 pte.pte_low |= _PAGE_SILENT_READ; 252 pte.pte_high |= _PAGE_SILENT_READ; 253 return pte; 254} 255#else 256static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; } 257static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 258static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } 259static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 260static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } 261 262static inline pte_t pte_wrprotect(pte_t pte) 263{ 264 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); 265 return pte; 266} 267 268static inline pte_t pte_rdprotect(pte_t pte) 269{ 270 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ); 271 return pte; 272} 273 274static inline pte_t pte_mkclean(pte_t pte) 275{ 276 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE); 277 return pte; 278} 279 280static inline pte_t pte_mkold(pte_t pte) 281{ 282 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ); 283 return pte; 284} 285 286static inline pte_t pte_mkwrite(pte_t pte) 287{ 288 pte_val(pte) |= _PAGE_WRITE; 289 if (pte_val(pte) & _PAGE_MODIFIED) 290 pte_val(pte) |= _PAGE_SILENT_WRITE; 291 return pte; 292} 293 294static inline pte_t pte_mkread(pte_t pte) 295{ 296 pte_val(pte) |= _PAGE_READ; 297 if (pte_val(pte) & _PAGE_ACCESSED) 298 pte_val(pte) |= _PAGE_SILENT_READ; 299 return pte; 300} 301 302static inline pte_t pte_mkdirty(pte_t pte) 303{ 304 pte_val(pte) |= _PAGE_MODIFIED; 305 if (pte_val(pte) & _PAGE_WRITE) 306 pte_val(pte) |= _PAGE_SILENT_WRITE; 307 return pte; 308} 309 310static inline pte_t pte_mkyoung(pte_t pte) 311{ 312 pte_val(pte) |= _PAGE_ACCESSED; 313 if (pte_val(pte) & _PAGE_READ) 314 pte_val(pte) |= _PAGE_SILENT_READ; 315 return pte; 316} 317#endif 318 319/* 320 * Macro to make mark a page protection value as "uncacheable". Note 321 * that "protection" is really a misnomer here as the protection value 322 * contains the memory attribute bits, dirty bits, and various other 323 * bits as well. 324 */ 325#define pgprot_noncached pgprot_noncached 326 327static inline pgprot_t pgprot_noncached(pgprot_t _prot) 328{ 329 unsigned long prot = pgprot_val(_prot); 330 331 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; 332 333 return __pgprot(prot); 334} 335 336/* 337 * Conversion functions: convert a page and protection to a page entry, 338 * and a page entry and page directory to the page they refer to. 339 */ 340#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 341 342#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) 343static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 344{ 345 pte.pte_low &= _PAGE_CHG_MASK; 346 pte.pte_high &= ~0x3f; 347 pte.pte_low |= pgprot_val(newprot); 348 pte.pte_high |= pgprot_val(newprot) & 0x3f; 349 return pte; 350} 351#else 352static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 353{ 354 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); 355} 356#endif 357 358 359extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, 360 pte_t pte); 361extern void __update_cache(struct vm_area_struct *vma, unsigned long address, 362 pte_t pte); 363 364static inline void update_mmu_cache(struct vm_area_struct *vma, 365 unsigned long address, pte_t pte) 366{ 367 __update_tlb(vma, address, pte); 368 __update_cache(vma, address, pte); 369} 370 371#define kern_addr_valid(addr) (1) 372 373#ifdef CONFIG_64BIT_PHYS_ADDR 374extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot); 375 376static inline int io_remap_pfn_range(struct vm_area_struct *vma, 377 unsigned long vaddr, 378 unsigned long pfn, 379 unsigned long size, 380 pgprot_t prot) 381{ 382 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size); 383 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot); 384} 385#else 386#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 387 remap_pfn_range(vma, vaddr, pfn, size, prot) 388#endif 389 390#include <asm-generic/pgtable.h> 391 392/* 393 * We provide our own get_unmapped area to cope with the virtual aliasing 394 * constraints placed on us by the cache architecture. 395 */ 396#define HAVE_ARCH_UNMAPPED_AREA 397 398/* 399 * No page table caches to initialise 400 */ 401#define pgtable_cache_init() do { } while (0) 402 403#endif /* _ASM_PGTABLE_H */ 404