LXR linux/include/asm-powerpc/pgtable-ppc64.h

   1#ifndef _ASM_POWERPC_PGTABLE_PPC64_H_
   2#define _ASM_POWERPC_PGTABLE_PPC64_H_
   3/*
   4 * This file contains the functions and defines necessary to modify and use
   5 * the ppc64 hashed page table.
   6 */
   7
   8#ifndef __ASSEMBLY__
   9#include <linux/stddef.h>
  10#include <asm/processor.h>              /* For TASK_SIZE */
  11#include <asm/mmu.h>
  12#include <asm/page.h>
  13#include <asm/tlbflush.h>
  14struct mm_struct;
  15#endif /* __ASSEMBLY__ */
  16
  17#ifdef CONFIG_PPC_64K_PAGES
  18#include <asm/pgtable-64k.h>
  19#else
  20#include <asm/pgtable-4k.h>
  21#endif
  22
  23#define FIRST_USER_ADDRESS      0
  24
  25/*
  26 * Size of EA range mapped by our pagetables.
  27 */
  28#define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
  29                            PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
  30#define PGTABLE_RANGE (1UL << PGTABLE_EADDR_SIZE)
  31
  32#if TASK_SIZE_USER64 > PGTABLE_RANGE
  33#error TASK_SIZE_USER64 exceeds pagetable range
  34#endif
  35
  36#if TASK_SIZE_USER64 > (1UL << (USER_ESID_BITS + SID_SHIFT))
  37#error TASK_SIZE_USER64 exceeds user VSID range
  38#endif
  39
  40/*
  41 * Define the address range of the vmalloc VM area.
  42 */
  43#define VMALLOC_START ASM_CONST(0xD000000000000000)
  44#define VMALLOC_SIZE  ASM_CONST(0x80000000000)
  45#define VMALLOC_END   (VMALLOC_START + VMALLOC_SIZE)
  46
  47/*
  48 * Define the address range of the imalloc VM area.
  49 */
  50#define PHBS_IO_BASE    VMALLOC_END
  51#define IMALLOC_BASE    (PHBS_IO_BASE + 0x80000000ul)   /* Reserve 2 gigs for PHBs */
  52#define IMALLOC_END     (VMALLOC_START + PGTABLE_RANGE)
  53
  54/*
  55 * Region IDs
  56 */
  57#define REGION_SHIFT            60UL
  58#define REGION_MASK             (0xfUL << REGION_SHIFT)
  59#define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
  60
  61#define VMALLOC_REGION_ID       (REGION_ID(VMALLOC_START))
  62#define KERNEL_REGION_ID        (REGION_ID(PAGE_OFFSET))
  63#define USER_REGION_ID          (0UL)
  64
  65/*
  66 * Common bits in a linux-style PTE.  These match the bits in the
  67 * (hardware-defined) PowerPC PTE as closely as possible. Additional
  68 * bits may be defined in pgtable-*.h
  69 */
  70#define _PAGE_PRESENT   0x0001 /* software: pte contains a translation */
  71#define _PAGE_USER      0x0002 /* matches one of the PP bits */
  72#define _PAGE_FILE      0x0002 /* (!present only) software: pte holds file offset */
  73#define _PAGE_EXEC      0x0004 /* No execute on POWER4 and newer (we invert) */
  74#define _PAGE_GUARDED   0x0008
  75#define _PAGE_COHERENT  0x0010 /* M: enforce memory coherence (SMP systems) */
  76#define _PAGE_NO_CACHE  0x0020 /* I: cache inhibit */
  77#define _PAGE_WRITETHRU 0x0040 /* W: cache write-through */
  78#define _PAGE_DIRTY     0x0080 /* C: page changed */
  79#define _PAGE_ACCESSED  0x0100 /* R: page referenced */
  80#define _PAGE_RW        0x0200 /* software: user write access allowed */
  81#define _PAGE_HASHPTE   0x0400 /* software: pte has an associated HPTE */
  82#define _PAGE_BUSY      0x0800 /* software: PTE & hash are busy */
  83
  84#define _PAGE_BASE      (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
  85
  86#define _PAGE_WRENABLE  (_PAGE_RW | _PAGE_DIRTY)
  87
  88/* __pgprot defined in asm-powerpc/page.h */
  89#define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
  90
  91#define PAGE_SHARED     __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER)
  92#define PAGE_SHARED_X   __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER | _PAGE_EXEC)
  93#define PAGE_COPY       __pgprot(_PAGE_BASE | _PAGE_USER)
  94#define PAGE_COPY_X     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
  95#define PAGE_READONLY   __pgprot(_PAGE_BASE | _PAGE_USER)
  96#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
  97#define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_WRENABLE)
  98#define PAGE_KERNEL_CI  __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
  99                               _PAGE_WRENABLE | _PAGE_NO_CACHE | _PAGE_GUARDED)
 100#define PAGE_KERNEL_EXEC __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_EXEC)
 101
 102#define PAGE_AGP        __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_NO_CACHE)
 103#define HAVE_PAGE_AGP
 104
 105/* PTEIDX nibble */
 106#define _PTEIDX_SECONDARY       0x8
 107#define _PTEIDX_GROUP_IX        0x7
 108
 109
 110/*
 111 * POWER4 and newer have per page execute protection, older chips can only
 112 * do this on a segment (256MB) basis.
 113 *
 114 * Also, write permissions imply read permissions.
 115 * This is the closest we can get..
 116 *
 117 * Note due to the way vm flags are laid out, the bits are XWR
 118 */
 119#define __P000  PAGE_NONE
 120#define __P001  PAGE_READONLY
 121#define __P010  PAGE_COPY
 122#define __P011  PAGE_COPY
 123#define __P100  PAGE_READONLY_X
 124#define __P101  PAGE_READONLY_X
 125#define __P110  PAGE_COPY_X
 126#define __P111  PAGE_COPY_X
 127
 128#define __S000  PAGE_NONE
 129#define __S001  PAGE_READONLY
 130#define __S010  PAGE_SHARED
 131#define __S011  PAGE_SHARED
 132#define __S100  PAGE_READONLY_X
 133#define __S101  PAGE_READONLY_X
 134#define __S110  PAGE_SHARED_X
 135#define __S111  PAGE_SHARED_X
 136
 137#ifndef __ASSEMBLY__
 138
 139/*
 140 * ZERO_PAGE is a global shared page that is always zero: used
 141 * for zero-mapped memory areas etc..
 142 */
 143extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
 144#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 145#endif /* __ASSEMBLY__ */
 146
 147#ifdef CONFIG_HUGETLB_PAGE
 148
 149#define HAVE_ARCH_UNMAPPED_AREA
 150#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 151
 152#endif
 153
 154#ifndef __ASSEMBLY__
 155
 156/*
 157 * Conversion functions: convert a page and protection to a page entry,
 158 * and a page entry and page directory to the page they refer to.
 159 *
 160 * mk_pte takes a (struct page *) as input
 161 */
 162#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 163
 164static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
 165{
 166        pte_t pte;
 167
 168
 169        pte_val(pte) = (pfn << PTE_RPN_SHIFT) | pgprot_val(pgprot);
 170        return pte;
 171}
 172
 173#define pte_modify(_pte, newprot) \
 174  (__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
 175
 176#define pte_none(pte)           ((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
 177#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 178
 179/* pte_clear moved to later in this file */
 180
 181#define pte_pfn(x)              ((unsigned long)((pte_val(x)>>PTE_RPN_SHIFT)))
 182#define pte_page(x)             pfn_to_page(pte_pfn(x))
 183
 184#define PMD_BAD_BITS            (PTE_TABLE_SIZE-1)
 185#define PUD_BAD_BITS            (PMD_TABLE_SIZE-1)
 186
 187#define pmd_set(pmdp, pmdval)   (pmd_val(*(pmdp)) = (pmdval))
 188#define pmd_none(pmd)           (!pmd_val(pmd))
 189#define pmd_bad(pmd)            (!is_kernel_addr(pmd_val(pmd)) \
 190                                 || (pmd_val(pmd) & PMD_BAD_BITS))
 191#define pmd_present(pmd)        (pmd_val(pmd) != 0)
 192#define pmd_clear(pmdp)         (pmd_val(*(pmdp)) = 0)
 193#define pmd_page_vaddr(pmd)     (pmd_val(pmd) & ~PMD_MASKED_BITS)
 194#define pmd_page(pmd)           virt_to_page(pmd_page_vaddr(pmd))
 195
 196#define pud_set(pudp, pudval)   (pud_val(*(pudp)) = (pudval))
 197#define pud_none(pud)           (!pud_val(pud))
 198#define pud_bad(pud)            (!is_kernel_addr(pud_val(pud)) \
 199                                 || (pud_val(pud) & PUD_BAD_BITS))
 200#define pud_present(pud)        (pud_val(pud) != 0)
 201#define pud_clear(pudp)         (pud_val(*(pudp)) = 0)
 202#define pud_page_vaddr(pud)     (pud_val(pud) & ~PUD_MASKED_BITS)
 203#define pud_page(pud)           virt_to_page(pud_page_vaddr(pud))
 204
 205#define pgd_set(pgdp, pudp)     ({pgd_val(*(pgdp)) = (unsigned long)(pudp);})
 206
 207/*
 208 * Find an entry in a page-table-directory.  We combine the address region
 209 * (the high order N bits) and the pgd portion of the address.
 210 */
 211/* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */
 212#define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x1ff)
 213
 214#define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
 215
 216#define pmd_offset(pudp,addr) \
 217  (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
 218
 219#define pte_offset_kernel(dir,addr) \
 220  (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 221
 222#define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 223#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
 224#define pte_unmap(pte)                  do { } while(0)
 225#define pte_unmap_nested(pte)           do { } while(0)
 226
 227/* to find an entry in a kernel page-table-directory */
 228/* This now only contains the vmalloc pages */
 229#define pgd_offset_k(address) pgd_offset(&init_mm, address)
 230
 231/*
 232 * The following only work if pte_present() is true.
 233 * Undefined behaviour if not..
 234 */
 235static inline int pte_read(pte_t pte)  { return pte_val(pte) & _PAGE_USER;}
 236static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;}
 237static inline int pte_exec(pte_t pte)  { return pte_val(pte) & _PAGE_EXEC;}
 238static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;}
 239static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;}
 240static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE;}
 241
 242static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
 243static inline void pte_cache(pte_t pte)   { pte_val(pte) &= ~_PAGE_NO_CACHE; }
 244
 245static inline pte_t pte_rdprotect(pte_t pte) {
 246        pte_val(pte) &= ~_PAGE_USER; return pte; }
 247static inline pte_t pte_exprotect(pte_t pte) {
 248        pte_val(pte) &= ~_PAGE_EXEC; return pte; }
 249static inline pte_t pte_wrprotect(pte_t pte) {
 250        pte_val(pte) &= ~(_PAGE_RW); return pte; }
 251static inline pte_t pte_mkclean(pte_t pte) {
 252        pte_val(pte) &= ~(_PAGE_DIRTY); return pte; }
 253static inline pte_t pte_mkold(pte_t pte) {
 254        pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 255static inline pte_t pte_mkread(pte_t pte) {
 256        pte_val(pte) |= _PAGE_USER; return pte; }
 257static inline pte_t pte_mkexec(pte_t pte) {
 258        pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; }
 259static inline pte_t pte_mkwrite(pte_t pte) {
 260        pte_val(pte) |= _PAGE_RW; return pte; }
 261static inline pte_t pte_mkdirty(pte_t pte) {
 262        pte_val(pte) |= _PAGE_DIRTY; return pte; }
 263static inline pte_t pte_mkyoung(pte_t pte) {
 264        pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 265static inline pte_t pte_mkhuge(pte_t pte) {
 266        return pte; }
 267
 268/* Atomic PTE updates */
 269static inline unsigned long pte_update(struct mm_struct *mm,
 270                                       unsigned long addr,
 271                                       pte_t *ptep, unsigned long clr,
 272                                       int huge)
 273{
 274        unsigned long old, tmp;
 275
 276        __asm__ __volatile__(
 277        "1:     ldarx   %0,0,%3         # pte_update\n\
 278        andi.   %1,%0,%6\n\
 279        bne-    1b \n\
 280        andc    %1,%0,%4 \n\
 281        stdcx.  %1,0,%3 \n\
 282        bne-    1b"
 283        : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
 284        : "r" (ptep), "r" (clr), "m" (*ptep), "i" (_PAGE_BUSY)
 285        : "cc" );
 286
 287        if (old & _PAGE_HASHPTE)
 288                hpte_need_flush(mm, addr, ptep, old, huge);
 289        return old;
 290}
 291
 292static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
 293                                              unsigned long addr, pte_t *ptep)
 294{
 295        unsigned long old;
 296
 297        if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
 298                return 0;
 299        old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0);
 300        return (old & _PAGE_ACCESSED) != 0;
 301}
 302#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 303#define ptep_test_and_clear_young(__vma, __addr, __ptep)                   \
 304({                                                                         \
 305        int __r;                                                           \
 306        __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
 307        __r;                                                               \
 308})
 309
 310/*
 311 * On RW/DIRTY bit transitions we can avoid flushing the hpte. For the
 312 * moment we always flush but we need to fix hpte_update and test if the
 313 * optimisation is worth it.
 314 */
 315static inline int __ptep_test_and_clear_dirty(struct mm_struct *mm,
 316                                              unsigned long addr, pte_t *ptep)
 317{
 318        unsigned long old;
 319
 320        if ((pte_val(*ptep) & _PAGE_DIRTY) == 0)
 321                return 0;
 322        old = pte_update(mm, addr, ptep, _PAGE_DIRTY, 0);
 323        return (old & _PAGE_DIRTY) != 0;
 324}
 325#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 326#define ptep_test_and_clear_dirty(__vma, __addr, __ptep)                   \
 327({                                                                         \
 328        int __r;                                                           \
 329        __r = __ptep_test_and_clear_dirty((__vma)->vm_mm, __addr, __ptep); \
 330        __r;                                                               \
 331})
 332
 333#define __HAVE_ARCH_PTEP_SET_WRPROTECT
 334static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 335                                      pte_t *ptep)
 336{
 337        unsigned long old;
 338
 339        if ((pte_val(*ptep) & _PAGE_RW) == 0)
 340                return;
 341        old = pte_update(mm, addr, ptep, _PAGE_RW, 0);
 342}
 343
 344/*
 345 * We currently remove entries from the hashtable regardless of whether
 346 * the entry was young or dirty. The generic routines only flush if the
 347 * entry was young or dirty which is not good enough.
 348 *
 349 * We should be more intelligent about this but for the moment we override
 350 * these functions and force a tlb flush unconditionally
 351 */
 352#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 353#define ptep_clear_flush_young(__vma, __address, __ptep)                \
 354({                                                                      \
 355        int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
 356                                                  __ptep);              \
 357        __young;                                                        \
 358})
 359
 360#define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
 361#define ptep_clear_flush_dirty(__vma, __address, __ptep)                \
 362({                                                                      \
 363        int __dirty = __ptep_test_and_clear_dirty((__vma)->vm_mm, __address, \
 364                                                  __ptep);              \
 365        __dirty;                                                        \
 366})
 367
 368#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 369static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 370                                       unsigned long addr, pte_t *ptep)
 371{
 372        unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0);
 373        return __pte(old);
 374}
 375
 376static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 377                             pte_t * ptep)
 378{
 379        pte_update(mm, addr, ptep, ~0UL, 0);
 380}
 381
 382/*
 383 * set_pte stores a linux PTE into the linux page table.
 384 */
 385static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 386                              pte_t *ptep, pte_t pte)
 387{
 388        if (pte_present(*ptep))
 389                pte_clear(mm, addr, ptep);
 390        pte = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
 391        *ptep = pte;
 392}
 393
 394/* Set the dirty and/or accessed bits atomically in a linux PTE, this
 395 * function doesn't need to flush the hash entry
 396 */
 397#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 398static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty)
 399{
 400        unsigned long bits = pte_val(entry) &
 401                (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
 402        unsigned long old, tmp;
 403
 404        __asm__ __volatile__(
 405        "1:     ldarx   %0,0,%4\n\
 406                andi.   %1,%0,%6\n\
 407                bne-    1b \n\
 408                or      %0,%3,%0\n\
 409                stdcx.  %0,0,%4\n\
 410                bne-    1b"
 411        :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
 412        :"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
 413        :"cc");
 414}
 415#define  ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 416({                                                                         \
 417        int __changed = !pte_same(*(__ptep), __entry);                     \
 418        if (__changed) {                                                   \
 419                __ptep_set_access_flags(__ptep, __entry, __dirty);         \
 420                flush_tlb_page_nohash(__vma, __address);                   \
 421        }                                                                  \
 422        __changed;                                                         \
 423})
 424
 425/*
 426 * Macro to mark a page protection value as "uncacheable".
 427 */
 428#define pgprot_noncached(prot)  (__pgprot(pgprot_val(prot) | _PAGE_NO_CACHE | _PAGE_GUARDED))
 429
 430struct file;
 431extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 432                                     unsigned long size, pgprot_t vma_prot);
 433#define __HAVE_PHYS_MEM_ACCESS_PROT
 434
 435#define __HAVE_ARCH_PTE_SAME
 436#define pte_same(A,B)   (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
 437
 438#define pte_ERROR(e) \
 439        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 440#define pmd_ERROR(e) \
 441        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 442#define pgd_ERROR(e) \
 443        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 444
 445extern pgd_t swapper_pg_dir[];
 446
 447extern void paging_init(void);
 448
 449/* Encode and de-code a swap entry */
 450#define __swp_type(entry)       (((entry).val >> 1) & 0x3f)
 451#define __swp_offset(entry)     ((entry).val >> 8)
 452#define __swp_entry(type, offset) ((swp_entry_t){((type)<< 1)|((offset)<<8)})
 453#define __pte_to_swp_entry(pte) ((swp_entry_t){pte_val(pte) >> PTE_RPN_SHIFT})
 454#define __swp_entry_to_pte(x)   ((pte_t) { (x).val << PTE_RPN_SHIFT })
 455#define pte_to_pgoff(pte)       (pte_val(pte) >> PTE_RPN_SHIFT)
 456#define pgoff_to_pte(off)       ((pte_t) {((off) << PTE_RPN_SHIFT)|_PAGE_FILE})
 457#define PTE_FILE_MAX_BITS       (BITS_PER_LONG - PTE_RPN_SHIFT)
 458
 459/*
 460 * kern_addr_valid is intended to indicate whether an address is a valid
 461 * kernel address.  Most 32-bit archs define it as always true (like this)
 462 * but most 64-bit archs actually perform a test.  What should we do here?
 463 * The only use is in fs/ncpfs/dir.c
 464 */
 465#define kern_addr_valid(addr)   (1)
 466
 467#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 468                remap_pfn_range(vma, vaddr, pfn, size, prot)
 469
 470void pgtable_cache_init(void);
 471
 472/*
 473 * find_linux_pte returns the address of a linux pte for a given
 474 * effective address and directory.  If not found, it returns zero.
 475 */static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea)
 476{
 477        pgd_t *pg;
 478        pud_t *pu;
 479        pmd_t *pm;
 480        pte_t *pt = NULL;
 481
 482        pg = pgdir + pgd_index(ea);
 483        if (!pgd_none(*pg)) {
 484                pu = pud_offset(pg, ea);
 485                if (!pud_none(*pu)) {
 486                        pm = pmd_offset(pu, ea);
 487                        if (pmd_present(*pm))
 488                                pt = pte_offset_kernel(pm, ea);
 489                }
 490        }
 491        return pt;
 492}
 493
 494#endif /* __ASSEMBLY__ */
 495
 496#endif /* _ASM_POWERPC_PGTABLE_PPC64_H_ */
 497