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
  79extern void paging_init(void);
  80
  81/*
  82 * Conversion functions: convert a page and protection to a page entry,
  83 * and a page entry and page directory to the page they refer to.
  84 */
  85#define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  86#define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  87#define pmd_page_vaddr(pmd)     pmd_val(pmd)
  88
  89#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
  90
  91#define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
  92#define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
  93
  94static inline void set_pte(pte_t *ptep, pte_t pte)
  95{
  96        ptep->pte_high = pte.pte_high;
  97        smp_wmb();
  98        ptep->pte_low = pte.pte_low;
  99        //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
 100
 101        if (pte.pte_low & _PAGE_GLOBAL) {
 102                pte_t *buddy = ptep_buddy(ptep);
 103                /*
 104                 * Make sure the buddy is global too (if it's !none,
 105                 * it better already be global)
 106                 */
 107                if (pte_none(*buddy)) {
 108                        buddy->pte_low  |= _PAGE_GLOBAL;
 109                        buddy->pte_high |= _PAGE_GLOBAL;
 110                }
 111        }
 112}
 113#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 114
 115static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 116{
 117        pte_t null = __pte(0);
 118
 119        /* Preserve global status for the pair */
 120        if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 121                null.pte_low = null.pte_high = _PAGE_GLOBAL;
 122
 123        set_pte_at(mm, addr, ptep, null);
 124}
 125#else
 126
 127#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 128#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 129
 130/*
 131 * Certain architectures need to do special things when pte's
 132 * within a page table are directly modified.  Thus, the following
 133 * hook is made available.
 134 */
 135static inline void set_pte(pte_t *ptep, pte_t pteval)
 136{
 137        *ptep = pteval;
 138#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 139        if (pte_val(pteval) & _PAGE_GLOBAL) {
 140                pte_t *buddy = ptep_buddy(ptep);
 141                /*
 142                 * Make sure the buddy is global too (if it's !none,
 143                 * it better already be global)
 144                 */
 145                if (pte_none(*buddy))
 146                        pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 147        }
 148#endif
 149}
 150#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 151
 152static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 153{
 154#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 155        /* Preserve global status for the pair */
 156        if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 157                set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 158        else
 159#endif
 160                set_pte_at(mm, addr, ptep, __pte(0));
 161}
 162#endif
 163
 164/*
 165 * (pmds are folded into puds so this doesn't get actually called,
 166 * but the define is needed for a generic inline function.)
 167 */
 168#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 169
 170#ifdef CONFIG_64BIT
 171/*
 172 * (puds are folded into pgds so this doesn't get actually called,
 173 * but the define is needed for a generic inline function.)
 174 */
 175#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 176#endif
 177
 178#define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 179#define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 180#define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 181
 182/*
 183 * We used to declare this array with size but gcc 3.3 and older are not able
 184 * to find that this expression is a constant, so the size is dropped.
 185 */
 186extern pgd_t swapper_pg_dir[];
 187
 188/*
 189 * The following only work if pte_present() is true.
 190 * Undefined behaviour if not..
 191 */
 192#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 193static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 194static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 195static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 196static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
 197
 198static inline pte_t pte_wrprotect(pte_t pte)
 199{
 200        pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 201        pte.pte_high &= ~_PAGE_SILENT_WRITE;
 202        return pte;
 203}
 204
 205static inline pte_t pte_mkclean(pte_t pte)
 206{
 207        pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 208        pte.pte_high &= ~_PAGE_SILENT_WRITE;
 209        return pte;
 210}
 211
 212static inline pte_t pte_mkold(pte_t pte)
 213{
 214        pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 215        pte.pte_high &= ~_PAGE_SILENT_READ;
 216        return pte;
 217}
 218
 219static inline pte_t pte_mkwrite(pte_t pte)
 220{
 221        pte.pte_low |= _PAGE_WRITE;
 222        if (pte.pte_low & _PAGE_MODIFIED) {
 223                pte.pte_low  |= _PAGE_SILENT_WRITE;
 224                pte.pte_high |= _PAGE_SILENT_WRITE;
 225        }
 226        return pte;
 227}
 228
 229static inline pte_t pte_mkdirty(pte_t pte)
 230{
 231        pte.pte_low |= _PAGE_MODIFIED;
 232        if (pte.pte_low & _PAGE_WRITE) {
 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_mkyoung(pte_t pte)
 240{
 241        pte.pte_low |= _PAGE_ACCESSED;
 242        if (pte.pte_low & _PAGE_READ) {
 243                pte.pte_low  |= _PAGE_SILENT_READ;
 244                pte.pte_high |= _PAGE_SILENT_READ;
 245        }
 246        return pte;
 247}
 248#else
 249static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 250static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 251static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 252static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 253
 254static inline pte_t pte_wrprotect(pte_t pte)
 255{
 256        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 257        return pte;
 258}
 259
 260static inline pte_t pte_mkclean(pte_t pte)
 261{
 262        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 263        return pte;
 264}
 265
 266static inline pte_t pte_mkold(pte_t pte)
 267{
 268        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 269        return pte;
 270}
 271
 272static inline pte_t pte_mkwrite(pte_t pte)
 273{
 274        pte_val(pte) |= _PAGE_WRITE;
 275        if (pte_val(pte) & _PAGE_MODIFIED)
 276                pte_val(pte) |= _PAGE_SILENT_WRITE;
 277        return pte;
 278}
 279
 280static inline pte_t pte_mkdirty(pte_t pte)
 281{
 282        pte_val(pte) |= _PAGE_MODIFIED;
 283        if (pte_val(pte) & _PAGE_WRITE)
 284                pte_val(pte) |= _PAGE_SILENT_WRITE;
 285        return pte;
 286}
 287
 288static inline pte_t pte_mkyoung(pte_t pte)
 289{
 290        pte_val(pte) |= _PAGE_ACCESSED;
 291        if (pte_val(pte) & _PAGE_READ)
 292                pte_val(pte) |= _PAGE_SILENT_READ;
 293        return pte;
 294}
 295#endif
 296static inline int pte_special(pte_t pte)        { return 0; }
 297static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 298
 299/*
 300 * Macro to make mark a page protection value as "uncacheable".  Note
 301 * that "protection" is really a misnomer here as the protection value
 302 * contains the memory attribute bits, dirty bits, and various other
 303 * bits as well.
 304 */
 305#define pgprot_noncached pgprot_noncached
 306
 307static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 308{
 309        unsigned long prot = pgprot_val(_prot);
 310
 311        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 312
 313        return __pgprot(prot);
 314}
 315
 316/*
 317 * Conversion functions: convert a page and protection to a page entry,
 318 * and a page entry and page directory to the page they refer to.
 319 */
 320#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 321
 322#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
 323static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 324{
 325        pte.pte_low  &= _PAGE_CHG_MASK;
 326        pte.pte_high &= ~0x3f;
 327        pte.pte_low  |= pgprot_val(newprot);
 328        pte.pte_high |= pgprot_val(newprot) & 0x3f;
 329        return pte;
 330}
 331#else
 332static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 333{
 334        return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 335}
 336#endif
 337
 338
 339extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 340        pte_t pte);
 341extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
 342        pte_t pte);
 343
 344static inline void update_mmu_cache(struct vm_area_struct *vma,
 345        unsigned long address, pte_t pte)
 346{
 347        __update_tlb(vma, address, pte);
 348        __update_cache(vma, address, pte);
 349}
 350
 351#define kern_addr_valid(addr)   (1)
 352
 353#ifdef CONFIG_64BIT_PHYS_ADDR
 354extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 355
 356static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 357                unsigned long vaddr,
 358                unsigned long pfn,
 359                unsigned long size,
 360                pgprot_t prot)
 361{
 362        phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 363        return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 364}
 365#else
 366#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 367                remap_pfn_range(vma, vaddr, pfn, size, prot)
 368#endif
 369
 370#include <asm-generic/pgtable.h>
 371
 372/*
 373 * We provide our own get_unmapped area to cope with the virtual aliasing
 374 * constraints placed on us by the cache architecture.
 375 */
 376#define HAVE_ARCH_UNMAPPED_AREA
 377
 378/*
 379 * No page table caches to initialise
 380 */
 381#define pgtable_cache_init()    do { } while (0)
 382
 383#endif /* _ASM_PGTABLE_H */
 384