LXR linux/arch/mips/include/asm/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
  44/*
  45 * Dummy values to fill the table in mmap.c
  46 * The real values will be generated at runtime
  47 */
  48#define __P000 __pgprot(0)
  49#define __P001 __pgprot(0)
  50#define __P010 __pgprot(0)
  51#define __P011 __pgprot(0)
  52#define __P100 __pgprot(0)
  53#define __P101 __pgprot(0)
  54#define __P110 __pgprot(0)
  55#define __P111 __pgprot(0)
  56
  57#define __S000 __pgprot(0)
  58#define __S001 __pgprot(0)
  59#define __S010 __pgprot(0)
  60#define __S011 __pgprot(0)
  61#define __S100 __pgprot(0)
  62#define __S101 __pgprot(0)
  63#define __S110 __pgprot(0)
  64#define __S111 __pgprot(0)
  65
  66extern unsigned long _page_cachable_default;
  67
  68/*
  69 * ZERO_PAGE is a global shared page that is always zero; used
  70 * for zero-mapped memory areas etc..
  71 */
  72
  73extern unsigned long empty_zero_page;
  74extern unsigned long zero_page_mask;
  75
  76#define ZERO_PAGE(vaddr) \
  77        (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  78
  79#define is_zero_pfn is_zero_pfn
  80static inline int is_zero_pfn(unsigned long pfn)
  81{
  82        extern unsigned long zero_pfn;
  83        unsigned long offset_from_zero_pfn = pfn - zero_pfn;
  84        return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
  85}
  86
  87#define my_zero_pfn(addr)       page_to_pfn(ZERO_PAGE(addr))
  88
  89extern void paging_init(void);
  90
  91/*
  92 * Conversion functions: convert a page and protection to a page entry,
  93 * and a page entry and page directory to the page they refer to.
  94 */
  95#define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  96#define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  97#define pmd_page_vaddr(pmd)     pmd_val(pmd)
  98
  99#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 100
 101#define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
 102#define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 103
 104static inline void set_pte(pte_t *ptep, pte_t pte)
 105{
 106        ptep->pte_high = pte.pte_high;
 107        smp_wmb();
 108        ptep->pte_low = pte.pte_low;
 109        //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
 110
 111        if (pte.pte_low & _PAGE_GLOBAL) {
 112                pte_t *buddy = ptep_buddy(ptep);
 113                /*
 114                 * Make sure the buddy is global too (if it's !none,
 115                 * it better already be global)
 116                 */
 117                if (pte_none(*buddy)) {
 118                        buddy->pte_low  |= _PAGE_GLOBAL;
 119                        buddy->pte_high |= _PAGE_GLOBAL;
 120                }
 121        }
 122}
 123#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 124
 125static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 126{
 127        pte_t null = __pte(0);
 128
 129        /* Preserve global status for the pair */
 130        if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 131                null.pte_low = null.pte_high = _PAGE_GLOBAL;
 132
 133        set_pte_at(mm, addr, ptep, null);
 134}
 135#else
 136
 137#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 138#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 139
 140/*
 141 * Certain architectures need to do special things when pte's
 142 * within a page table are directly modified.  Thus, the following
 143 * hook is made available.
 144 */
 145static inline void set_pte(pte_t *ptep, pte_t pteval)
 146{
 147        *ptep = pteval;
 148#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 149        if (pte_val(pteval) & _PAGE_GLOBAL) {
 150                pte_t *buddy = ptep_buddy(ptep);
 151                /*
 152                 * Make sure the buddy is global too (if it's !none,
 153                 * it better already be global)
 154                 */
 155                if (pte_none(*buddy))
 156                        pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 157        }
 158#endif
 159}
 160#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 161
 162static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 163{
 164#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 165        /* Preserve global status for the pair */
 166        if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 167                set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 168        else
 169#endif
 170                set_pte_at(mm, addr, ptep, __pte(0));
 171}
 172#endif
 173
 174/*
 175 * (pmds are folded into puds so this doesn't get actually called,
 176 * but the define is needed for a generic inline function.)
 177 */
 178#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 179
 180#ifdef CONFIG_64BIT
 181/*
 182 * (puds are folded into pgds so this doesn't get actually called,
 183 * but the define is needed for a generic inline function.)
 184 */
 185#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 186#endif
 187
 188#define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 189#define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 190#define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 191
 192/*
 193 * We used to declare this array with size but gcc 3.3 and older are not able
 194 * to find that this expression is a constant, so the size is dropped.
 195 */
 196extern pgd_t swapper_pg_dir[];
 197
 198/*
 199 * The following only work if pte_present() is true.
 200 * Undefined behaviour if not..
 201 */
 202#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 203static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 204static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 205static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 206static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 207
 208static inline pte_t pte_wrprotect(pte_t pte)
 209{
 210        pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 211        pte.pte_high &= ~_PAGE_SILENT_WRITE;
 212        return pte;
 213}
 214
 215static inline pte_t pte_mkclean(pte_t pte)
 216{
 217        pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 218        pte.pte_high &= ~_PAGE_SILENT_WRITE;
 219        return pte;
 220}
 221
 222static inline pte_t pte_mkold(pte_t pte)
 223{
 224        pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 225        pte.pte_high &= ~_PAGE_SILENT_READ;
 226        return pte;
 227}
 228
 229static inline pte_t pte_mkwrite(pte_t pte)
 230{
 231        pte.pte_low |= _PAGE_WRITE;
 232        if (pte.pte_low & _PAGE_MODIFIED) {
 233                pte.pte_low  |= _PAGE_SILENT_WRITE;
 234                pte.pte_high |= _PAGE_SILENT_WRITE;
 235        }
 236        return pte;
 237}
 238
 239static inline pte_t pte_mkdirty(pte_t pte)
 240{
 241        pte.pte_low |= _PAGE_MODIFIED;
 242        if (pte.pte_low & _PAGE_WRITE) {
 243                pte.pte_low  |= _PAGE_SILENT_WRITE;
 244                pte.pte_high |= _PAGE_SILENT_WRITE;
 245        }
 246        return pte;
 247}
 248
 249static inline pte_t pte_mkyoung(pte_t pte)
 250{
 251        pte.pte_low |= _PAGE_ACCESSED;
 252        if (pte.pte_low & _PAGE_READ) {
 253                pte.pte_low  |= _PAGE_SILENT_READ;
 254                pte.pte_high |= _PAGE_SILENT_READ;
 255        }
 256        return pte;
 257}
 258#else
 259static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 260static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 261static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 262static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 263
 264static inline pte_t pte_wrprotect(pte_t pte)
 265{
 266        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 267        return pte;
 268}
 269
 270static inline pte_t pte_mkclean(pte_t pte)
 271{
 272        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 273        return pte;
 274}
 275
 276static inline pte_t pte_mkold(pte_t pte)
 277{
 278        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 279        return pte;
 280}
 281
 282static inline pte_t pte_mkwrite(pte_t pte)
 283{
 284        pte_val(pte) |= _PAGE_WRITE;
 285        if (pte_val(pte) & _PAGE_MODIFIED)
 286                pte_val(pte) |= _PAGE_SILENT_WRITE;
 287        return pte;
 288}
 289
 290static inline pte_t pte_mkdirty(pte_t pte)
 291{
 292        pte_val(pte) |= _PAGE_MODIFIED;
 293        if (pte_val(pte) & _PAGE_WRITE)
 294                pte_val(pte) |= _PAGE_SILENT_WRITE;
 295        return pte;
 296}
 297
 298static inline pte_t pte_mkyoung(pte_t pte)
 299{
 300        pte_val(pte) |= _PAGE_ACCESSED;
 301        if (pte_val(pte) & _PAGE_READ)
 302                pte_val(pte) |= _PAGE_SILENT_READ;
 303        return pte;
 304}
 305
 306#ifdef _PAGE_HUGE
 307static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 308
 309static inline pte_t pte_mkhuge(pte_t pte)
 310{
 311        pte_val(pte) |= _PAGE_HUGE;
 312        return pte;
 313}
 314#endif /* _PAGE_HUGE */
 315#endif
 316static inline int pte_special(pte_t pte)        { return 0; }
 317static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 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)
 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