include/asm-ppc64/pgtable.h

   1 #ifndef _PPC64_PGTABLE_H
   2 #define _PPC64_PGTABLE_H
   3
   4 /*
   5  * This file contains the functions and defines necessary to modify and use
   6  * the ppc64 hashed page table.
   7  */
   8
   9 #ifndef __ASSEMBLY__
  10 #include <linux/config.h>
  11 #include <linux/stddef.h>
  12 #include <asm/processor.h>              /* For TASK_SIZE */
  13 #include <asm/mmu.h>
  14 #include <asm/page.h>
  15 #include <asm/tlbflush.h>
  16 #endif /* __ASSEMBLY__ */
  17
  18 /*
  19  * Entries per page directory level.  The PTE level must use a 64b record
  20  * for each page table entry.  The PMD and PGD level use a 32b record for
  21  * each entry by assuming that each entry is page aligned.
  22  */
  23 #define PTE_INDEX_SIZE  9
  24 #define PMD_INDEX_SIZE  7
  25 #define PUD_INDEX_SIZE  7
  26 #define PGD_INDEX_SIZE  9
  27
  28 #define PTE_TABLE_SIZE  (sizeof(pte_t) << PTE_INDEX_SIZE)
  29 #define PMD_TABLE_SIZE  (sizeof(pmd_t) << PMD_INDEX_SIZE)
  30 #define PUD_TABLE_SIZE  (sizeof(pud_t) << PUD_INDEX_SIZE)
  31 #define PGD_TABLE_SIZE  (sizeof(pgd_t) << PGD_INDEX_SIZE)
  32
  33 #define PTRS_PER_PTE    (1 << PTE_INDEX_SIZE)
  34 #define PTRS_PER_PMD    (1 << PMD_INDEX_SIZE)
  35 #define PTRS_PER_PUD    (1 << PMD_INDEX_SIZE)
  36 #define PTRS_PER_PGD    (1 << PGD_INDEX_SIZE)
  37
  38 /* PMD_SHIFT determines what a second-level page table entry can map */
  39 #define PMD_SHIFT       (PAGE_SHIFT + PTE_INDEX_SIZE)
  40 #define PMD_SIZE        (1UL << PMD_SHIFT)
  41 #define PMD_MASK        (~(PMD_SIZE-1))
  42
  43 /* PUD_SHIFT determines what a third-level page table entry can map */
  44 #define PUD_SHIFT       (PMD_SHIFT + PMD_INDEX_SIZE)
  45 #define PUD_SIZE        (1UL << PUD_SHIFT)
  46 #define PUD_MASK        (~(PUD_SIZE-1))
  47
  48 /* PGDIR_SHIFT determines what a fourth-level page table entry can map */
  49 #define PGDIR_SHIFT     (PUD_SHIFT + PUD_INDEX_SIZE)
  50 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  51 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  52
  53 #define FIRST_USER_ADDRESS      0
  54
  55 /*
  56  * Size of EA range mapped by our pagetables.
  57  */
  58 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
  59                             PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
  60 #define PGTABLE_RANGE (1UL << PGTABLE_EADDR_SIZE)
  61
  62 #if TASK_SIZE_USER64 > PGTABLE_RANGE
  63 #error TASK_SIZE_USER64 exceeds pagetable range
  64 #endif
  65
  66 #if TASK_SIZE_USER64 > (1UL << (USER_ESID_BITS + SID_SHIFT))
  67 #error TASK_SIZE_USER64 exceeds user VSID range
  68 #endif
  69
  70 /*
  71  * Define the address range of the vmalloc VM area.
  72  */
  73 #define VMALLOC_START (0xD000000000000000ul)
  74 #define VMALLOC_SIZE  (0x80000000000UL)
  75 #define VMALLOC_END   (VMALLOC_START + VMALLOC_SIZE)
  76
  77 /*
  78  * Bits in a linux-style PTE.  These match the bits in the
  79  * (hardware-defined) PowerPC PTE as closely as possible.
  80  */
  81 #define _PAGE_PRESENT   0x0001 /* software: pte contains a translation */
  82 #define _PAGE_USER      0x0002 /* matches one of the PP bits */
  83 #define _PAGE_FILE      0x0002 /* (!present only) software: pte holds file offset */
  84 #define _PAGE_EXEC      0x0004 /* No execute on POWER4 and newer (we invert) */
  85 #define _PAGE_GUARDED   0x0008
  86 #define _PAGE_COHERENT  0x0010 /* M: enforce memory coherence (SMP systems) */
  87 #define _PAGE_NO_CACHE  0x0020 /* I: cache inhibit */
  88 #define _PAGE_WRITETHRU 0x0040 /* W: cache write-through */
  89 #define _PAGE_DIRTY     0x0080 /* C: page changed */
  90 #define _PAGE_ACCESSED  0x0100 /* R: page referenced */
  91 #define _PAGE_RW        0x0200 /* software: user write access allowed */
  92 #define _PAGE_HASHPTE   0x0400 /* software: pte has an associated HPTE */
  93 #define _PAGE_BUSY      0x0800 /* software: PTE & hash are busy */
  94 #define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
  95 #define _PAGE_GROUP_IX  0x7000 /* software: HPTE index within group */
  96 #define _PAGE_HUGE      0x10000 /* 16MB page */
  97 /* Bits 0x7000 identify the index within an HPT Group */
  98 #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_SECONDARY | _PAGE_GROUP_IX)
  99 /* PAGE_MASK gives the right answer below, but only by accident */
 100 /* It should be preserving the high 48 bits and then specifically */
 101 /* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
 102 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HPTEFLAGS)
 103
 104 #define _PAGE_BASE      (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
 105
 106 #define _PAGE_WRENABLE  (_PAGE_RW | _PAGE_DIRTY)
 107
 108 /* __pgprot defined in asm-ppc64/page.h */
 109 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
 110
 111 #define PAGE_SHARED     __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER)
 112 #define PAGE_SHARED_X   __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER | _PAGE_EXEC)
 113 #define PAGE_COPY       __pgprot(_PAGE_BASE | _PAGE_USER)
 114 #define PAGE_COPY_X     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
 115 #define PAGE_READONLY   __pgprot(_PAGE_BASE | _PAGE_USER)
 116 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
 117 #define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_WRENABLE)
 118 #define PAGE_KERNEL_CI  __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 119                                _PAGE_WRENABLE | _PAGE_NO_CACHE | _PAGE_GUARDED)
 120 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_EXEC)
 121
 122 #define PAGE_AGP        __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_NO_CACHE)
 123 #define HAVE_PAGE_AGP
 124
 125 /*
 126  * This bit in a hardware PTE indicates that the page is *not* executable.
 127  */
 128 #define HW_NO_EXEC      _PAGE_EXEC
 129
 130 /*
 131  * POWER4 and newer have per page execute protection, older chips can only
 132  * do this on a segment (256MB) basis.
 133  *
 134  * Also, write permissions imply read permissions.
 135  * This is the closest we can get..
 136  *
 137  * Note due to the way vm flags are laid out, the bits are XWR
 138  */
 139 #define __P000  PAGE_NONE
 140 #define __P001  PAGE_READONLY
 141 #define __P010  PAGE_COPY
 142 #define __P011  PAGE_COPY
 143 #define __P100  PAGE_READONLY_X
 144 #define __P101  PAGE_READONLY_X
 145 #define __P110  PAGE_COPY_X
 146 #define __P111  PAGE_COPY_X
 147
 148 #define __S000  PAGE_NONE
 149 #define __S001  PAGE_READONLY
 150 #define __S010  PAGE_SHARED
 151 #define __S011  PAGE_SHARED
 152 #define __S100  PAGE_READONLY_X
 153 #define __S101  PAGE_READONLY_X
 154 #define __S110  PAGE_SHARED_X
 155 #define __S111  PAGE_SHARED_X
 156
 157 #ifndef __ASSEMBLY__
 158
 159 /*
 160  * ZERO_PAGE is a global shared page that is always zero: used
 161  * for zero-mapped memory areas etc..
 162  */
 163 extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
 164 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 165 #endif /* __ASSEMBLY__ */
 166
 167 /* shift to put page number into pte */
 168 #define PTE_SHIFT (17)
 169
 170 #ifdef CONFIG_HUGETLB_PAGE
 171
 172 #ifndef __ASSEMBLY__
 173 int hash_huge_page(struct mm_struct *mm, unsigned long access,
 174                    unsigned long ea, unsigned long vsid, int local);
 175 #endif /* __ASSEMBLY__ */
 176
 177 #define HAVE_ARCH_UNMAPPED_AREA
 178 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 179 #else
 180
 181 #define hash_huge_page(mm,a,ea,vsid,local)      -1
 182
 183 #endif
 184
 185 #ifndef __ASSEMBLY__
 186
 187 /*
 188  * Conversion functions: convert a page and protection to a page entry,
 189  * and a page entry and page directory to the page they refer to.
 190  *
 191  * mk_pte takes a (struct page *) as input
 192  */
 193 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 194
 195 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
 196 {
 197         pte_t pte;
 198
 199
 200         pte_val(pte) = (pfn << PTE_SHIFT) | pgprot_val(pgprot);
 201         return pte;
 202 }
 203
 204 #define pte_modify(_pte, newprot) \
 205   (__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
 206
 207 #define pte_none(pte)           ((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
 208 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 209
 210 /* pte_clear moved to later in this file */
 211
 212 #define pte_pfn(x)              ((unsigned long)((pte_val(x) >> PTE_SHIFT)))
 213 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 214
 215 #define pmd_set(pmdp, ptep)     ({BUG_ON((u64)ptep < KERNELBASE); pmd_val(*(pmdp)) = (unsigned long)(ptep);})
 216 #define pmd_none(pmd)           (!pmd_val(pmd))
 217 #define pmd_bad(pmd)            (pmd_val(pmd) == 0)
 218 #define pmd_present(pmd)        (pmd_val(pmd) != 0)
 219 #define pmd_clear(pmdp)         (pmd_val(*(pmdp)) = 0)
 220 #define pmd_page_kernel(pmd)    (pmd_val(pmd))
 221 #define pmd_page(pmd)           virt_to_page(pmd_page_kernel(pmd))
 222
 223 #define pud_set(pudp, pmdp)     (pud_val(*(pudp)) = (unsigned long)(pmdp))
 224 #define pud_none(pud)           (!pud_val(pud))
 225 #define pud_bad(pud)            ((pud_val(pud)) == 0)
 226 #define pud_present(pud)        (pud_val(pud) != 0)
 227 #define pud_clear(pudp)         (pud_val(*(pudp)) = 0)
 228 #define pud_page(pud)           (pud_val(pud))
 229
 230 #define pgd_set(pgdp, pudp)     ({pgd_val(*(pgdp)) = (unsigned long)(pudp);})
 231 #define pgd_none(pgd)           (!pgd_val(pgd))
 232 #define pgd_bad(pgd)            (pgd_val(pgd) == 0)
 233 #define pgd_present(pgd)        (pgd_val(pgd) != 0)
 234 #define pgd_clear(pgdp)         (pgd_val(*(pgdp)) = 0)
 235 #define pgd_page(pgd)           (pgd_val(pgd))
 236
 237 /*
 238  * Find an entry in a page-table-directory.  We combine the address region
 239  * (the high order N bits) and the pgd portion of the address.
 240  */
 241 /* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */
 242 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x1ff)
 243
 244 #define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
 245
 246 #define pud_offset(pgdp, addr)  \
 247   (((pud_t *) pgd_page(*(pgdp))) + (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
 248
 249 #define pmd_offset(pudp,addr) \
 250   (((pmd_t *) pud_page(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
 251
 252 #define pte_offset_kernel(dir,addr) \
 253   (((pte_t *) pmd_page_kernel(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 254
 255 #define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 256 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
 257 #define pte_unmap(pte)                  do { } while(0)
 258 #define pte_unmap_nested(pte)           do { } while(0)
 259
 260 /* to find an entry in a kernel page-table-directory */
 261 /* This now only contains the vmalloc pages */
 262 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 263
 264 /*
 265  * The following only work if pte_present() is true.
 266  * Undefined behaviour if not..
 267  */
 268 static inline int pte_read(pte_t pte)  { return pte_val(pte) & _PAGE_USER;}
 269 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;}
 270 static inline int pte_exec(pte_t pte)  { return pte_val(pte) & _PAGE_EXEC;}
 271 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;}
 272 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;}
 273 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE;}
 274 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE;}
 275
 276 static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
 277 static inline void pte_cache(pte_t pte)   { pte_val(pte) &= ~_PAGE_NO_CACHE; }
 278
 279 static inline pte_t pte_rdprotect(pte_t pte) {
 280         pte_val(pte) &= ~_PAGE_USER; return pte; }
 281 static inline pte_t pte_exprotect(pte_t pte) {
 282         pte_val(pte) &= ~_PAGE_EXEC; return pte; }
 283 static inline pte_t pte_wrprotect(pte_t pte) {
 284         pte_val(pte) &= ~(_PAGE_RW); return pte; }
 285 static inline pte_t pte_mkclean(pte_t pte) {
 286         pte_val(pte) &= ~(_PAGE_DIRTY); return pte; }
 287 static inline pte_t pte_mkold(pte_t pte) {
 288         pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 289
 290 static inline pte_t pte_mkread(pte_t pte) {
 291         pte_val(pte) |= _PAGE_USER; return pte; }
 292 static inline pte_t pte_mkexec(pte_t pte) {
 293         pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; }
 294 static inline pte_t pte_mkwrite(pte_t pte) {
 295         pte_val(pte) |= _PAGE_RW; return pte; }
 296 static inline pte_t pte_mkdirty(pte_t pte) {
 297         pte_val(pte) |= _PAGE_DIRTY; return pte; }
 298 static inline pte_t pte_mkyoung(pte_t pte) {
 299         pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 300 static inline pte_t pte_mkhuge(pte_t pte) {
 301         pte_val(pte) |= _PAGE_HUGE; return pte; }
 302
 303 /* Atomic PTE updates */
 304 static inline unsigned long pte_update(pte_t *p, unsigned long clr)
 305 {
 306         unsigned long old, tmp;
 307
 308         __asm__ __volatile__(
 309         "1:     ldarx   %0,0,%3         # pte_update\n\
 310         andi.   %1,%0,%6\n\
 311         bne-    1b \n\
 312         andc    %1,%0,%4 \n\
 313         stdcx.  %1,0,%3 \n\
 314         bne-    1b"
 315         : "=&r" (old), "=&r" (tmp), "=m" (*p)
 316         : "r" (p), "r" (clr), "m" (*p), "i" (_PAGE_BUSY)
 317         : "cc" );
 318         return old;
 319 }
 320
 321 /* PTE updating functions, this function puts the PTE in the
 322  * batch, doesn't actually triggers the hash flush immediately,
 323  * you need to call flush_tlb_pending() to do that.
 324  */
 325 extern void hpte_update(struct mm_struct *mm, unsigned long addr, unsigned long pte,
 326                         int wrprot);
 327
 328 static inline int __ptep_test_and_clear_young(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 329 {
 330         unsigned long old;
 331
 332         if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
 333                 return 0;
 334         old = pte_update(ptep, _PAGE_ACCESSED);
 335         if (old & _PAGE_HASHPTE) {
 336                 hpte_update(mm, addr, old, 0);
 337                 flush_tlb_pending();
 338         }
 339         return (old & _PAGE_ACCESSED) != 0;
 340 }
 341 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 342 #define ptep_test_and_clear_young(__vma, __addr, __ptep)                   \
 343 ({                                                                         \
 344         int __r;                                                           \
 345         __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
 346         __r;                                                               \
 347 })
 348
 349 /*
 350  * On RW/DIRTY bit transitions we can avoid flushing the hpte. For the
 351  * moment we always flush but we need to fix hpte_update and test if the
 352  * optimisation is worth it.
 353  */
 354 static inline int __ptep_test_and_clear_dirty(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 355 {
 356         unsigned long old;
 357
 358         if ((pte_val(*ptep) & _PAGE_DIRTY) == 0)
 359                 return 0;
 360         old = pte_update(ptep, _PAGE_DIRTY);
 361         if (old & _PAGE_HASHPTE)
 362                 hpte_update(mm, addr, old, 0);
 363         return (old & _PAGE_DIRTY) != 0;
 364 }
 365 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 366 #define ptep_test_and_clear_dirty(__vma, __addr, __ptep)                   \
 367 ({                                                                         \
 368         int __r;                                                           \
 369         __r = __ptep_test_and_clear_dirty((__vma)->vm_mm, __addr, __ptep); \
 370         __r;                                                               \
 371 })
 372
 373 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 374 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 375 {
 376         unsigned long old;
 377
 378         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 379                 return;
 380         old = pte_update(ptep, _PAGE_RW);
 381         if (old & _PAGE_HASHPTE)
 382                 hpte_update(mm, addr, old, 0);
 383 }
 384
 385 /*
 386  * We currently remove entries from the hashtable regardless of whether
 387  * the entry was young or dirty. The generic routines only flush if the
 388  * entry was young or dirty which is not good enough.
 389  *
 390  * We should be more intelligent about this but for the moment we override
 391  * these functions and force a tlb flush unconditionally
 392  */
 393 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 394 #define ptep_clear_flush_young(__vma, __address, __ptep)                \
 395 ({                                                                      \
 396         int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
 397                                                   __ptep);              \
 398         __young;                                                        \
 399 })
 400
 401 #define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
 402 #define ptep_clear_flush_dirty(__vma, __address, __ptep)                \
 403 ({                                                                      \
 404         int __dirty = __ptep_test_and_clear_dirty((__vma)->vm_mm, __address, \
 405                                                   __ptep);              \
 406         flush_tlb_page(__vma, __address);                               \
 407         __dirty;                                                        \
 408 })
 409
 410 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 411 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 412 {
 413         unsigned long old = pte_update(ptep, ~0UL);
 414
 415         if (old & _PAGE_HASHPTE)
 416                 hpte_update(mm, addr, old, 0);
 417         return __pte(old);
 418 }
 419
 420 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t * ptep)
 421 {
 422         unsigned long old = pte_update(ptep, ~0UL);
 423
 424         if (old & _PAGE_HASHPTE)
 425                 hpte_update(mm, addr, old, 0);
 426 }
 427
 428 /*
 429  * set_pte stores a linux PTE into the linux page table.
 430  */
 431 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 432                               pte_t *ptep, pte_t pte)
 433 {
 434         if (pte_present(*ptep)) {
 435                 pte_clear(mm, addr, ptep);
 436                 flush_tlb_pending();
 437         }
 438         *ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
 439 }
 440
 441 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
 442  * function doesn't need to flush the hash entry
 443  */
 444 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 445 static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty)
 446 {
 447         unsigned long bits = pte_val(entry) &
 448                 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
 449         unsigned long old, tmp;
 450
 451         __asm__ __volatile__(
 452         "1:     ldarx   %0,0,%4\n\
 453                 andi.   %1,%0,%6\n\
 454                 bne-    1b \n\
 455                 or      %0,%3,%0\n\
 456                 stdcx.  %0,0,%4\n\
 457                 bne-    1b"
 458         :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
 459         :"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
 460         :"cc");
 461 }
 462 #define  ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 463         do {                                                               \
 464                 __ptep_set_access_flags(__ptep, __entry, __dirty);         \
 465                 flush_tlb_page_nohash(__vma, __address);                   \
 466         } while(0)
 467
 468 /*
 469  * Macro to mark a page protection value as "uncacheable".
 470  */
 471 #define pgprot_noncached(prot)  (__pgprot(pgprot_val(prot) | _PAGE_NO_CACHE | _PAGE_GUARDED))
 472
 473 struct file;
 474 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 475                                      unsigned long size, pgprot_t vma_prot);
 476 #define __HAVE_PHYS_MEM_ACCESS_PROT
 477
 478 #define __HAVE_ARCH_PTE_SAME
 479 #define pte_same(A,B)   (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
 480
 481 #define pmd_ERROR(e) \
 482         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 483 #define pud_ERROR(e) \
 484         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pud_val(e))
 485 #define pgd_ERROR(e) \
 486         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 487
 488 extern pgd_t swapper_pg_dir[];
 489
 490 extern void paging_init(void);
 491
 492 #ifdef CONFIG_HUGETLB_PAGE
 493 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
 494         free_pgd_range(tlb, addr, end, floor, ceiling)
 495 #endif
 496
 497 /*
 498  * This gets called at the end of handling a page fault, when
 499  * the kernel has put a new PTE into the page table for the process.
 500  * We use it to put a corresponding HPTE into the hash table
 501  * ahead of time, instead of waiting for the inevitable extra
 502  * hash-table miss exception.
 503  */
 504 struct vm_area_struct;
 505 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
 506
 507 /* Encode and de-code a swap entry */
 508 #define __swp_type(entry)       (((entry).val >> 1) & 0x3f)
 509 #define __swp_offset(entry)     ((entry).val >> 8)
 510 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
 511 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> PTE_SHIFT })
 512 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val << PTE_SHIFT })
 513 #define pte_to_pgoff(pte)       (pte_val(pte) >> PTE_SHIFT)
 514 #define pgoff_to_pte(off)       ((pte_t) {((off) << PTE_SHIFT)|_PAGE_FILE})
 515 #define PTE_FILE_MAX_BITS       (BITS_PER_LONG - PTE_SHIFT)
 516
 517 /*
 518  * kern_addr_valid is intended to indicate whether an address is a valid
 519  * kernel address.  Most 32-bit archs define it as always true (like this)
 520  * but most 64-bit archs actually perform a test.  What should we do here?
 521  * The only use is in fs/ncpfs/dir.c
 522  */
 523 #define kern_addr_valid(addr)   (1)
 524
 525 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 526                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 527
 528 void pgtable_cache_init(void);
 529
 530 /*
 531  * find_linux_pte returns the address of a linux pte for a given
 532  * effective address and directory.  If not found, it returns zero.
 533  */
 534 static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea)
 535 {
 536         pgd_t *pg;
 537         pud_t *pu;
 538         pmd_t *pm;
 539         pte_t *pt = NULL;
 540         pte_t pte;
 541
 542         pg = pgdir + pgd_index(ea);
 543         if (!pgd_none(*pg)) {
 544                 pu = pud_offset(pg, ea);
 545                 if (!pud_none(*pu)) {
 546                         pm = pmd_offset(pu, ea);
 547                         if (pmd_present(*pm)) {
 548                                 pt = pte_offset_kernel(pm, ea);
 549                                 pte = *pt;
 550                                 if (!pte_present(pte))
 551                                         pt = NULL;
 552                         }
 553                 }
 554         }
 555
 556         return pt;
 557 }
 558
 559 #include <asm-generic/pgtable.h>
 560
 561 #endif /* __ASSEMBLY__ */
 562
 563 #endif /* _PPC64_PGTABLE_H */