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_WRITE | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \
  26                                 _page_cachable_default)
  27#define PAGE_COPY       __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \
  28                                 (kernel_uses_smartmips_rixi ?  _PAGE_NO_EXEC : 0) | _page_cachable_default)
  29#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _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 | (kernel_uses_smartmips_rixi ? 0 : _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 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
  40 * execute, and consider it to be the same as read. Also, write
  41 * permissions imply read permissions. This is the closest we can get
  42 * by reasonable means..
  43 */
  44
  45/*
  46 * Dummy values to fill the table in mmap.c
  47 * The real values will be generated at runtime
  48 */
  49#define __P000 __pgprot(0)
  50#define __P001 __pgprot(0)
  51#define __P010 __pgprot(0)
  52#define __P011 __pgprot(0)
  53#define __P100 __pgprot(0)
  54#define __P101 __pgprot(0)
  55#define __P110 __pgprot(0)
  56#define __P111 __pgprot(0)
  57
  58#define __S000 __pgprot(0)
  59#define __S001 __pgprot(0)
  60#define __S010 __pgprot(0)
  61#define __S011 __pgprot(0)
  62#define __S100 __pgprot(0)
  63#define __S101 __pgprot(0)
  64#define __S110 __pgprot(0)
  65#define __S111 __pgprot(0)
  66
  67extern unsigned long _page_cachable_default;
  68
  69/*
  70 * ZERO_PAGE is a global shared page that is always zero; used
  71 * for zero-mapped memory areas etc..
  72 */
  73
  74extern unsigned long empty_zero_page;
  75extern unsigned long zero_page_mask;
  76
  77#define ZERO_PAGE(vaddr) \
  78        (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  79
  80#define is_zero_pfn is_zero_pfn
  81static inline int is_zero_pfn(unsigned long pfn)
  82{
  83        extern unsigned long zero_pfn;
  84        unsigned long offset_from_zero_pfn = pfn - zero_pfn;
  85        return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
  86}
  87
  88#define my_zero_pfn(addr)       page_to_pfn(ZERO_PAGE(addr))
  89
  90extern void paging_init(void);
  91
  92/*
  93 * Conversion functions: convert a page and protection to a page entry,
  94 * and a page entry and page directory to the page they refer to.
  95 */
  96#define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  97#define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  98#define pmd_page_vaddr(pmd)     pmd_val(pmd)
  99
 100#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 101
 102#define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
 103#define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 104
 105static inline void set_pte(pte_t *ptep, pte_t pte)
 106{
 107        ptep->pte_high = pte.pte_high;
 108        smp_wmb();
 109        ptep->pte_low = pte.pte_low;
 110        //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
 111
 112        if (pte.pte_low & _PAGE_GLOBAL) {
 113                pte_t *buddy = ptep_buddy(ptep);
 114                /*
 115                 * Make sure the buddy is global too (if it's !none,
 116                 * it better already be global)
 117                 */
 118                if (pte_none(*buddy)) {
 119                        buddy->pte_low  |= _PAGE_GLOBAL;
 120                        buddy->pte_high |= _PAGE_GLOBAL;
 121                }
 122        }
 123}
 124#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 125
 126static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 127{
 128        pte_t null = __pte(0);
 129
 130        /* Preserve global status for the pair */
 131        if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 132                null.pte_low = null.pte_high = _PAGE_GLOBAL;
 133
 134        set_pte_at(mm, addr, ptep, null);
 135}
 136#else
 137
 138#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 139#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 140
 141/*
 142 * Certain architectures need to do special things when pte's
 143 * within a page table are directly modified.  Thus, the following
 144 * hook is made available.
 145 */
 146static inline void set_pte(pte_t *ptep, pte_t pteval)
 147{
 148        *ptep = pteval;
 149#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 150        if (pte_val(pteval) & _PAGE_GLOBAL) {
 151                pte_t *buddy = ptep_buddy(ptep);
 152                /*
 153                 * Make sure the buddy is global too (if it's !none,
 154                 * it better already be global)
 155                 */
 156                if (pte_none(*buddy))
 157                        pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 158        }
 159#endif
 160}
 161#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 162
 163static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 164{
 165#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 166        /* Preserve global status for the pair */
 167        if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 168                set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 169        else
 170#endif
 171                set_pte_at(mm, addr, ptep, __pte(0));
 172}
 173#endif
 174
 175/*
 176 * (pmds are folded into puds so this doesn't get actually called,
 177 * but the define is needed for a generic inline function.)
 178 */
 179#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 180
 181#ifndef __PAGETABLE_PMD_FOLDED
 182/*
 183 * (puds are folded into pgds so this doesn't get actually called,
 184 * but the define is needed for a generic inline function.)
 185 */
 186#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 187#endif
 188
 189#define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 190#define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 191#define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 192
 193/*
 194 * We used to declare this array with size but gcc 3.3 and older are not able
 195 * to find that this expression is a constant, so the size is dropped.
 196 */
 197extern pgd_t swapper_pg_dir[];
 198
 199/*
 200 * The following only work if pte_present() is true.
 201 * Undefined behaviour if not..
 202 */
 203#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 204static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 205static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 206static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 207static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 208
 209static inline pte_t pte_wrprotect(pte_t pte)
 210{
 211        pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 212        pte.pte_high &= ~_PAGE_SILENT_WRITE;
 213        return pte;
 214}
 215
 216static inline pte_t pte_mkclean(pte_t pte)
 217{
 218        pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 219        pte.pte_high &= ~_PAGE_SILENT_WRITE;
 220        return pte;
 221}
 222
 223static inline pte_t pte_mkold(pte_t pte)
 224{
 225        pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 226        pte.pte_high &= ~_PAGE_SILENT_READ;
 227        return pte;
 228}
 229
 230static inline pte_t pte_mkwrite(pte_t pte)
 231{
 232        pte.pte_low |= _PAGE_WRITE;
 233        if (pte.pte_low & _PAGE_MODIFIED) {
 234                pte.pte_low  |= _PAGE_SILENT_WRITE;
 235                pte.pte_high |= _PAGE_SILENT_WRITE;
 236        }
 237        return pte;
 238}
 239
 240static inline pte_t pte_mkdirty(pte_t pte)
 241{
 242        pte.pte_low |= _PAGE_MODIFIED;
 243        if (pte.pte_low & _PAGE_WRITE) {
 244                pte.pte_low  |= _PAGE_SILENT_WRITE;
 245                pte.pte_high |= _PAGE_SILENT_WRITE;
 246        }
 247        return pte;
 248}
 249
 250static inline pte_t pte_mkyoung(pte_t pte)
 251{
 252        pte.pte_low |= _PAGE_ACCESSED;
 253        if (pte.pte_low & _PAGE_READ) {
 254                pte.pte_low  |= _PAGE_SILENT_READ;
 255                pte.pte_high |= _PAGE_SILENT_READ;
 256        }
 257        return pte;
 258}
 259#else
 260static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 261static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 262static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 263static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 264
 265static inline pte_t pte_wrprotect(pte_t pte)
 266{
 267        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 268        return pte;
 269}
 270
 271static inline pte_t pte_mkclean(pte_t pte)
 272{
 273        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 274        return pte;
 275}
 276
 277static inline pte_t pte_mkold(pte_t pte)
 278{
 279        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 280        return pte;
 281}
 282
 283static inline pte_t pte_mkwrite(pte_t pte)
 284{
 285        pte_val(pte) |= _PAGE_WRITE;
 286        if (pte_val(pte) & _PAGE_MODIFIED)
 287                pte_val(pte) |= _PAGE_SILENT_WRITE;
 288        return pte;
 289}
 290
 291static inline pte_t pte_mkdirty(pte_t pte)
 292{
 293        pte_val(pte) |= _PAGE_MODIFIED;
 294        if (pte_val(pte) & _PAGE_WRITE)
 295                pte_val(pte) |= _PAGE_SILENT_WRITE;
 296        return pte;
 297}
 298
 299static inline pte_t pte_mkyoung(pte_t pte)
 300{
 301        pte_val(pte) |= _PAGE_ACCESSED;
 302        if (kernel_uses_smartmips_rixi) {
 303                if (!(pte_val(pte) & _PAGE_NO_READ))
 304                        pte_val(pte) |= _PAGE_SILENT_READ;
 305        } else {
 306                if (pte_val(pte) & _PAGE_READ)
 307                        pte_val(pte) |= _PAGE_SILENT_READ;
 308        }
 309        return pte;
 310}
 311
 312#ifdef _PAGE_HUGE
 313static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 314
 315static inline pte_t pte_mkhuge(pte_t pte)
 316{
 317        pte_val(pte) |= _PAGE_HUGE;
 318        return pte;
 319}
 320#endif /* _PAGE_HUGE */
 321#endif
 322static inline int pte_special(pte_t pte)        { return 0; }
 323static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 324
 325/*
 326 * Macro to make mark a page protection value as "uncacheable".  Note
 327 * that "protection" is really a misnomer here as the protection value
 328 * contains the memory attribute bits, dirty bits, and various other
 329 * bits as well.
 330 */
 331#define pgprot_noncached pgprot_noncached
 332
 333static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 334{
 335        unsigned long prot = pgprot_val(_prot);
 336
 337        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 338
 339        return __pgprot(prot);
 340}
 341
 342/*
 343 * Conversion functions: convert a page and protection to a page entry,
 344 * and a page entry and page directory to the page they refer to.
 345 */
 346#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 347
 348#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 349static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 350{
 351        pte.pte_low  &= _PAGE_CHG_MASK;
 352        pte.pte_high &= ~0x3f;
 353        pte.pte_low  |= pgprot_val(newprot);
 354        pte.pte_high |= pgprot_val(newprot) & 0x3f;
 355        return pte;
 356}
 357#else
 358static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 359{
 360        return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 361}
 362#endif
 363
 364
 365extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 366        pte_t pte);
 367extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 368        pte_t pte);
 369
 370static inline void update_mmu_cache(struct vm_area_struct *vma,
 371        unsigned long address, pte_t *ptep)
 372{
 373        pte_t pte = *ptep;
 374        __update_tlb(vma, address, pte);
 375        __update_cache(vma, address, pte);
 376}
 377
 378#define kern_addr_valid(addr)   (1)
 379
 380#ifdef CONFIG_64BIT_PHYS_ADDR
 381extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 382
 383static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 384                unsigned long vaddr,
 385                unsigned long pfn,
 386                unsigned long size,
 387                pgprot_t prot)
 388{
 389        phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 390        return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 391}
 392#else
 393#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 394                remap_pfn_range(vma, vaddr, pfn, size, prot)
 395#endif
 396
 397#include <asm-generic/pgtable.h>
 398
 399/*
 400 * uncached accelerated TLB map for video memory access
 401 */
 402#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
 403#define __HAVE_PHYS_MEM_ACCESS_PROT
 404
 405struct file;
 406pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 407                unsigned long size, pgprot_t vma_prot);
 408int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 409                unsigned long size, pgprot_t *vma_prot);
 410#endif
 411
 412/*
 413 * We provide our own get_unmapped area to cope with the virtual aliasing
 414 * constraints placed on us by the cache architecture.
 415 */
 416#define HAVE_ARCH_UNMAPPED_AREA
 417
 418/*
 419 * No page table caches to initialise
 420 */
 421#define pgtable_cache_init()    do { } while (0)
 422
 423#endif /* _ASM_PGTABLE_H */
 424