arch/powerpc/include/asm/book3s/64/hash.h

   1 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_H
   2 #define _ASM_POWERPC_BOOK3S_64_HASH_H
   3 #ifdef __KERNEL__
   4
   5 /*
   6  * Common bits between 4K and 64K pages in a linux-style PTE.
   7  * Additional bits may be defined in pgtable-hash64-*.h
   8  *
   9  * Note: We only support user read/write permissions. Supervisor always
  10  * have full read/write to pages above PAGE_OFFSET (pages below that
  11  * always use the user access permissions).
  12  *
  13  * We could create separate kernel read-only if we used the 3 PP bits
  14  * combinations that newer processors provide but we currently don't.
  15  */
  16 #define _PAGE_BIT_SWAP_TYPE     0
  17
  18 #define _PAGE_EXEC              0x00001 /* execute permission */
  19 #define _PAGE_RW                0x00002 /* read & write access allowed */
  20 #define _PAGE_READ              0x00004 /* read access allowed */
  21 #define _PAGE_USER              0x00008 /* page may be accessed by userspace */
  22 #define _PAGE_GUARDED           0x00010 /* G: guarded (side-effect) page */
  23 /* M (memory coherence) is always set in the HPTE, so we don't need it here */
  24 #define _PAGE_COHERENT          0x0
  25 #define _PAGE_NO_CACHE          0x00020 /* I: cache inhibit */
  26 #define _PAGE_WRITETHRU         0x00040 /* W: cache write-through */
  27 #define _PAGE_DIRTY             0x00080 /* C: page changed */
  28 #define _PAGE_ACCESSED          0x00100 /* R: page referenced */
  29 #define _PAGE_SPECIAL           0x00400 /* software: special page */
  30 #define _PAGE_BUSY              0x00800 /* software: PTE & hash are busy */
  31
  32 #ifdef CONFIG_MEM_SOFT_DIRTY
  33 #define _PAGE_SOFT_DIRTY        0x200 /* software: software dirty tracking */
  34 #else
  35 #define _PAGE_SOFT_DIRTY        0x000
  36 #endif
  37
  38 #define _PAGE_F_GIX_SHIFT       57
  39 #define _PAGE_F_GIX             (7ul << 57)     /* HPTE index within HPTEG */
  40 #define _PAGE_F_SECOND          (1ul << 60)     /* HPTE is in 2ndary HPTEG */
  41 #define _PAGE_HASHPTE           (1ul << 61)     /* PTE has associated HPTE */
  42 #define _PAGE_PTE               (1ul << 62)     /* distinguishes PTEs from pointers */
  43 #define _PAGE_PRESENT           (1ul << 63)     /* pte contains a translation */
  44
  45 /*
  46  * We need to differentiate between explicit huge page and THP huge
  47  * page, since THP huge page also need to track real subpage details
  48  */
  49 #define _PAGE_THP_HUGE  _PAGE_4K_PFN
  50
  51 /*
  52  * set of bits not changed in pmd_modify.
  53  */
  54 #define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
  55                          _PAGE_ACCESSED | _PAGE_THP_HUGE | _PAGE_PTE | \
  56                          _PAGE_SOFT_DIRTY)
  57
  58
  59 #ifdef CONFIG_PPC_64K_PAGES
  60 #include <asm/book3s/64/hash-64k.h>
  61 #else
  62 #include <asm/book3s/64/hash-4k.h>
  63 #endif
  64
  65 /*
  66  * Size of EA range mapped by our pagetables.
  67  */
  68 #define PGTABLE_EADDR_SIZE      (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
  69                                  PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
  70 #define PGTABLE_RANGE           (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
  71
  72 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  73 #define PMD_CACHE_INDEX (PMD_INDEX_SIZE + 1)
  74 #else
  75 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
  76 #endif
  77 /*
  78  * Define the address range of the kernel non-linear virtual area
  79  */
  80 #define KERN_VIRT_START ASM_CONST(0xD000000000000000)
  81 #define KERN_VIRT_SIZE  ASM_CONST(0x0000100000000000)
  82
  83 /*
  84  * The vmalloc space starts at the beginning of that region, and
  85  * occupies half of it on hash CPUs and a quarter of it on Book3E
  86  * (we keep a quarter for the virtual memmap)
  87  */
  88 #define VMALLOC_START   KERN_VIRT_START
  89 #define VMALLOC_SIZE    (KERN_VIRT_SIZE >> 1)
  90 #define VMALLOC_END     (VMALLOC_START + VMALLOC_SIZE)
  91
  92 /*
  93  * Region IDs
  94  */
  95 #define REGION_SHIFT            60UL
  96 #define REGION_MASK             (0xfUL << REGION_SHIFT)
  97 #define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
  98
  99 #define VMALLOC_REGION_ID       (REGION_ID(VMALLOC_START))
 100 #define KERNEL_REGION_ID        (REGION_ID(PAGE_OFFSET))
 101 #define VMEMMAP_REGION_ID       (0xfUL) /* Server only */
 102 #define USER_REGION_ID          (0UL)
 103
 104 /*
 105  * Defines the address of the vmemap area, in its own region on
 106  * hash table CPUs.
 107  */
 108 #define VMEMMAP_BASE            (VMEMMAP_REGION_ID << REGION_SHIFT)
 109
 110 #ifdef CONFIG_PPC_MM_SLICES
 111 #define HAVE_ARCH_UNMAPPED_AREA
 112 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 113 #endif /* CONFIG_PPC_MM_SLICES */
 114
 115 /* No separate kernel read-only */
 116 #define _PAGE_KERNEL_RW         (_PAGE_RW | _PAGE_DIRTY) /* user access blocked by key */
 117 #define _PAGE_KERNEL_RO          _PAGE_KERNEL_RW
 118 #define _PAGE_KERNEL_RWX        (_PAGE_DIRTY | _PAGE_RW | _PAGE_EXEC)
 119
 120 /* Strong Access Ordering */
 121 #define _PAGE_SAO               (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT)
 122
 123 /* No page size encoding in the linux PTE */
 124 #define _PAGE_PSIZE             0
 125
 126 /* PTEIDX nibble */
 127 #define _PTEIDX_SECONDARY       0x8
 128 #define _PTEIDX_GROUP_IX        0x7
 129
 130 #define _PTE_NONE_MASK  _PAGE_HPTEFLAGS
 131 /*
 132  * The mask convered by the RPN must be a ULL on 32-bit platforms with
 133  * 64-bit PTEs
 134  */
 135 #define PTE_RPN_MASK    (((1UL << PTE_RPN_SIZE) - 1) << PTE_RPN_SHIFT)
 136 /*
 137  * _PAGE_CHG_MASK masks of bits that are to be preserved across
 138  * pgprot changes
 139  */
 140 #define _PAGE_CHG_MASK  (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
 141                          _PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \
 142                          _PAGE_SOFT_DIRTY)
 143 /*
 144  * Mask of bits returned by pte_pgprot()
 145  */
 146 #define PAGE_PROT_BITS  (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
 147                          _PAGE_WRITETHRU | _PAGE_4K_PFN | \
 148                          _PAGE_USER | _PAGE_ACCESSED |  \
 149                          _PAGE_RW |  _PAGE_DIRTY | _PAGE_EXEC | \
 150                          _PAGE_SOFT_DIRTY)
 151 /*
 152  * We define 2 sets of base prot bits, one for basic pages (ie,
 153  * cacheable kernel and user pages) and one for non cacheable
 154  * pages. We always set _PAGE_COHERENT when SMP is enabled or
 155  * the processor might need it for DMA coherency.
 156  */
 157 #define _PAGE_BASE_NC   (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
 158 #define _PAGE_BASE      (_PAGE_BASE_NC | _PAGE_COHERENT)
 159
 160 /* Permission masks used to generate the __P and __S table,
 161  *
 162  * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
 163  *
 164  * Write permissions imply read permissions for now (we could make write-only
 165  * pages on BookE but we don't bother for now). Execute permission control is
 166  * possible on platforms that define _PAGE_EXEC
 167  *
 168  * Note due to the way vm flags are laid out, the bits are XWR
 169  */
 170 #define PAGE_NONE       __pgprot(_PAGE_BASE)
 171 #define PAGE_SHARED     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
 172 #define PAGE_SHARED_X   __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
 173                                  _PAGE_EXEC)
 174 #define PAGE_COPY       __pgprot(_PAGE_BASE | _PAGE_USER )
 175 #define PAGE_COPY_X     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
 176 #define PAGE_READONLY   __pgprot(_PAGE_BASE | _PAGE_USER )
 177 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
 178
 179 #define __P000  PAGE_NONE
 180 #define __P001  PAGE_READONLY
 181 #define __P010  PAGE_COPY
 182 #define __P011  PAGE_COPY
 183 #define __P100  PAGE_READONLY_X
 184 #define __P101  PAGE_READONLY_X
 185 #define __P110  PAGE_COPY_X
 186 #define __P111  PAGE_COPY_X
 187
 188 #define __S000  PAGE_NONE
 189 #define __S001  PAGE_READONLY
 190 #define __S010  PAGE_SHARED
 191 #define __S011  PAGE_SHARED
 192 #define __S100  PAGE_READONLY_X
 193 #define __S101  PAGE_READONLY_X
 194 #define __S110  PAGE_SHARED_X
 195 #define __S111  PAGE_SHARED_X
 196
 197 /* Permission masks used for kernel mappings */
 198 #define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
 199 #define PAGE_KERNEL_NC  __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
 200                                  _PAGE_NO_CACHE)
 201 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
 202                                  _PAGE_NO_CACHE | _PAGE_GUARDED)
 203 #define PAGE_KERNEL_X   __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
 204 #define PAGE_KERNEL_RO  __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
 205 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
 206
 207 /* Protection used for kernel text. We want the debuggers to be able to
 208  * set breakpoints anywhere, so don't write protect the kernel text
 209  * on platforms where such control is possible.
 210  */
 211 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
 212         defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
 213 #define PAGE_KERNEL_TEXT        PAGE_KERNEL_X
 214 #else
 215 #define PAGE_KERNEL_TEXT        PAGE_KERNEL_ROX
 216 #endif
 217
 218 /* Make modules code happy. We don't set RO yet */
 219 #define PAGE_KERNEL_EXEC        PAGE_KERNEL_X
 220 #define PAGE_AGP                (PAGE_KERNEL_NC)
 221
 222 #define PMD_BAD_BITS            (PTE_TABLE_SIZE-1)
 223 #define PUD_BAD_BITS            (PMD_TABLE_SIZE-1)
 224
 225 #ifndef __ASSEMBLY__
 226 #define pmd_bad(pmd)            (pmd_val(pmd) & PMD_BAD_BITS)
 227 #define pmd_page_vaddr(pmd)     __va(pmd_val(pmd) & ~PMD_MASKED_BITS)
 228
 229 #define pud_bad(pud)            (pud_val(pud) & PUD_BAD_BITS)
 230 #define pud_page_vaddr(pud)     __va(pud_val(pud) & ~PUD_MASKED_BITS)
 231
 232 /* Pointers in the page table tree are physical addresses */
 233 #define __pgtable_ptr_val(ptr)  __pa(ptr)
 234
 235 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
 236 #define pud_index(address) (((address) >> (PUD_SHIFT)) & (PTRS_PER_PUD - 1))
 237 #define pmd_index(address) (((address) >> (PMD_SHIFT)) & (PTRS_PER_PMD - 1))
 238 #define pte_index(address) (((address) >> (PAGE_SHIFT)) & (PTRS_PER_PTE - 1))
 239
 240 extern void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
 241                             pte_t *ptep, unsigned long pte, int huge);
 242 extern unsigned long htab_convert_pte_flags(unsigned long pteflags);
 243 /* Atomic PTE updates */
 244 static inline unsigned long pte_update(struct mm_struct *mm,
 245                                        unsigned long addr,
 246                                        pte_t *ptep, unsigned long clr,
 247                                        unsigned long set,
 248                                        int huge)
 249 {
 250         __be64 old_be, tmp_be;
 251         unsigned long old;
 252
 253         __asm__ __volatile__(
 254         "1:     ldarx   %0,0,%3         # pte_update\n\
 255         and.    %1,%0,%6\n\
 256         bne-    1b \n\
 257         andc    %1,%0,%4 \n\
 258         or      %1,%1,%7\n\
 259         stdcx.  %1,0,%3 \n\
 260         bne-    1b"
 261         : "=&r" (old_be), "=&r" (tmp_be), "=m" (*ptep)
 262         : "r" (ptep), "r" (cpu_to_be64(clr)), "m" (*ptep),
 263           "r" (cpu_to_be64(_PAGE_BUSY)), "r" (cpu_to_be64(set))
 264         : "cc" );
 265         /* huge pages use the old page table lock */
 266         if (!huge)
 267                 assert_pte_locked(mm, addr);
 268
 269         old = be64_to_cpu(old_be);
 270         if (old & _PAGE_HASHPTE)
 271                 hpte_need_flush(mm, addr, ptep, old, huge);
 272
 273         return old;
 274 }
 275
 276 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
 277                                               unsigned long addr, pte_t *ptep)
 278 {
 279         unsigned long old;
 280
 281         if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
 282                 return 0;
 283         old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
 284         return (old & _PAGE_ACCESSED) != 0;
 285 }
 286 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 287 #define ptep_test_and_clear_young(__vma, __addr, __ptep)                   \
 288 ({                                                                         \
 289         int __r;                                                           \
 290         __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
 291         __r;                                                               \
 292 })
 293
 294 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 295 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 296                                       pte_t *ptep)
 297 {
 298
 299         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 300                 return;
 301
 302         pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
 303 }
 304
 305 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 306                                            unsigned long addr, pte_t *ptep)
 307 {
 308         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 309                 return;
 310
 311         pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
 312 }
 313
 314 /*
 315  * We currently remove entries from the hashtable regardless of whether
 316  * the entry was young or dirty. The generic routines only flush if the
 317  * entry was young or dirty which is not good enough.
 318  *
 319  * We should be more intelligent about this but for the moment we override
 320  * these functions and force a tlb flush unconditionally
 321  */
 322 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 323 #define ptep_clear_flush_young(__vma, __address, __ptep)                \
 324 ({                                                                      \
 325         int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
 326                                                   __ptep);              \
 327         __young;                                                        \
 328 })
 329
 330 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 331 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 332                                        unsigned long addr, pte_t *ptep)
 333 {
 334         unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
 335         return __pte(old);
 336 }
 337
 338 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 339                              pte_t * ptep)
 340 {
 341         pte_update(mm, addr, ptep, ~0UL, 0, 0);
 342 }
 343
 344
 345 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
 346  * function doesn't need to flush the hash entry
 347  */
 348 static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 349 {
 350         __be64 old, tmp, val, mask;
 351
 352         mask = cpu_to_be64(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW |
 353                            _PAGE_EXEC | _PAGE_SOFT_DIRTY);
 354
 355         val = pte_raw(entry) & mask;
 356
 357         __asm__ __volatile__(
 358         "1:     ldarx   %0,0,%4\n\
 359                 and.    %1,%0,%6\n\
 360                 bne-    1b \n\
 361                 or      %0,%3,%0\n\
 362                 stdcx.  %0,0,%4\n\
 363                 bne-    1b"
 364         :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
 365         :"r" (val), "r" (ptep), "m" (*ptep), "r" (cpu_to_be64(_PAGE_BUSY))
 366         :"cc");
 367 }
 368
 369 static inline int pgd_bad(pgd_t pgd)
 370 {
 371         return (pgd_val(pgd) == 0);
 372 }
 373
 374 #define __HAVE_ARCH_PTE_SAME
 375 #define pte_same(A,B)   (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
 376 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 377 {
 378         return (unsigned long)__va(pgd_val(pgd) & ~PGD_MASKED_BITS);
 379 }
 380
 381
 382 /* Generic accessors to PTE bits */
 383 static inline int pte_write(pte_t pte)          { return !!(pte_val(pte) & _PAGE_RW);}
 384 static inline int pte_dirty(pte_t pte)          { return !!(pte_val(pte) & _PAGE_DIRTY); }
 385 static inline int pte_young(pte_t pte)          { return !!(pte_val(pte) & _PAGE_ACCESSED); }
 386 static inline int pte_special(pte_t pte)        { return !!(pte_val(pte) & _PAGE_SPECIAL); }
 387 static inline int pte_none(pte_t pte)           { return (pte_val(pte) & ~_PTE_NONE_MASK) == 0; }
 388 static inline pgprot_t pte_pgprot(pte_t pte)    { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); }
 389
 390 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 391 static inline bool pte_soft_dirty(pte_t pte)
 392 {
 393         return !!(pte_val(pte) & _PAGE_SOFT_DIRTY);
 394 }
 395 static inline pte_t pte_mksoft_dirty(pte_t pte)
 396 {
 397         return __pte(pte_val(pte) | _PAGE_SOFT_DIRTY);
 398 }
 399
 400 static inline pte_t pte_clear_soft_dirty(pte_t pte)
 401 {
 402         return __pte(pte_val(pte) & ~_PAGE_SOFT_DIRTY);
 403 }
 404 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
 405
 406 #ifdef CONFIG_NUMA_BALANCING
 407 /*
 408  * These work without NUMA balancing but the kernel does not care. See the
 409  * comment in include/asm-generic/pgtable.h . On powerpc, this will only
 410  * work for user pages and always return true for kernel pages.
 411  */
 412 static inline int pte_protnone(pte_t pte)
 413 {
 414         return (pte_val(pte) &
 415                 (_PAGE_PRESENT | _PAGE_USER)) == _PAGE_PRESENT;
 416 }
 417 #endif /* CONFIG_NUMA_BALANCING */
 418
 419 static inline int pte_present(pte_t pte)
 420 {
 421         return !!(pte_val(pte) & _PAGE_PRESENT);
 422 }
 423
 424 /* Conversion functions: convert a page and protection to a page entry,
 425  * and a page entry and page directory to the page they refer to.
 426  *
 427  * Even if PTEs can be unsigned long long, a PFN is always an unsigned
 428  * long for now.
 429  */
 430 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
 431 {
 432         return __pte((((pte_basic_t)(pfn) << PTE_RPN_SHIFT) & PTE_RPN_MASK) |
 433                      pgprot_val(pgprot));
 434 }
 435
 436 static inline unsigned long pte_pfn(pte_t pte)
 437 {
 438         return (pte_val(pte) & PTE_RPN_MASK) >> PTE_RPN_SHIFT;
 439 }
 440
 441 /* Generic modifiers for PTE bits */
 442 static inline pte_t pte_wrprotect(pte_t pte)
 443 {
 444         return __pte(pte_val(pte) & ~_PAGE_RW);
 445 }
 446
 447 static inline pte_t pte_mkclean(pte_t pte)
 448 {
 449         return __pte(pte_val(pte) & ~_PAGE_DIRTY);
 450 }
 451
 452 static inline pte_t pte_mkold(pte_t pte)
 453 {
 454         return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
 455 }
 456
 457 static inline pte_t pte_mkwrite(pte_t pte)
 458 {
 459         return __pte(pte_val(pte) | _PAGE_RW);
 460 }
 461
 462 static inline pte_t pte_mkdirty(pte_t pte)
 463 {
 464         return __pte(pte_val(pte) | _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 465 }
 466
 467 static inline pte_t pte_mkyoung(pte_t pte)
 468 {
 469         return __pte(pte_val(pte) | _PAGE_ACCESSED);
 470 }
 471
 472 static inline pte_t pte_mkspecial(pte_t pte)
 473 {
 474         return __pte(pte_val(pte) | _PAGE_SPECIAL);
 475 }
 476
 477 static inline pte_t pte_mkhuge(pte_t pte)
 478 {
 479         return pte;
 480 }
 481
 482 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 483 {
 484         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 485 }
 486
 487 /* This low level function performs the actual PTE insertion
 488  * Setting the PTE depends on the MMU type and other factors. It's
 489  * an horrible mess that I'm not going to try to clean up now but
 490  * I'm keeping it in one place rather than spread around
 491  */
 492 static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
 493                                 pte_t *ptep, pte_t pte, int percpu)
 494 {
 495         /*
 496          * Anything else just stores the PTE normally. That covers all 64-bit
 497          * cases, and 32-bit non-hash with 32-bit PTEs.
 498          */
 499         *ptep = pte;
 500 }
 501
 502 /*
 503  * Macro to mark a page protection value as "uncacheable".
 504  */
 505
 506 #define _PAGE_CACHE_CTL (_PAGE_COHERENT | _PAGE_GUARDED | _PAGE_NO_CACHE | \
 507                          _PAGE_WRITETHRU)
 508
 509 #define pgprot_noncached pgprot_noncached
 510 static inline pgprot_t pgprot_noncached(pgprot_t prot)
 511 {
 512         return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) |
 513                         _PAGE_NO_CACHE | _PAGE_GUARDED);
 514 }
 515
 516 #define pgprot_noncached_wc pgprot_noncached_wc
 517 static inline pgprot_t pgprot_noncached_wc(pgprot_t prot)
 518 {
 519         return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) |
 520                         _PAGE_NO_CACHE);
 521 }
 522
 523 #define pgprot_cached pgprot_cached
 524 static inline pgprot_t pgprot_cached(pgprot_t prot)
 525 {
 526         return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) |
 527                         _PAGE_COHERENT);
 528 }
 529
 530 #define pgprot_cached_wthru pgprot_cached_wthru
 531 static inline pgprot_t pgprot_cached_wthru(pgprot_t prot)
 532 {
 533         return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) |
 534                         _PAGE_COHERENT | _PAGE_WRITETHRU);
 535 }
 536
 537 #define pgprot_cached_noncoherent pgprot_cached_noncoherent
 538 static inline pgprot_t pgprot_cached_noncoherent(pgprot_t prot)
 539 {
 540         return __pgprot(pgprot_val(prot) & ~_PAGE_CACHE_CTL);
 541 }
 542
 543 #define pgprot_writecombine pgprot_writecombine
 544 static inline pgprot_t pgprot_writecombine(pgprot_t prot)
 545 {
 546         return pgprot_noncached_wc(prot);
 547 }
 548
 549 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 550 extern void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
 551                                    pmd_t *pmdp, unsigned long old_pmd);
 552 #else
 553 static inline void hpte_do_hugepage_flush(struct mm_struct *mm,
 554                                           unsigned long addr, pmd_t *pmdp,
 555                                           unsigned long old_pmd)
 556 {
 557         WARN(1, "%s called with THP disabled\n", __func__);
 558 }
 559 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 560
 561 #endif /* !__ASSEMBLY__ */
 562 #endif /* __KERNEL__ */
 563 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_H */