LXR linux/include/asm-mips/pgtable.h

   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