include/asm-sparc64/pgtable.h

   1 /* $Id: pgtable.h,v 1.156 2002/02/09 19:49:31 davem Exp $
   2  * pgtable.h: SpitFire page table operations.
   3  *
   4  * Copyright 1996,1997 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  */
   7
   8 #ifndef _SPARC64_PGTABLE_H
   9 #define _SPARC64_PGTABLE_H
  10
  11 /* This file contains the functions and defines necessary to modify and use
  12  * the SpitFire page tables.
  13  */
  14
  15 #include <asm-generic/pgtable-nopud.h>
  16
  17 #include <linux/config.h>
  18 #include <linux/compiler.h>
  19 #include <asm/types.h>
  20 #include <asm/spitfire.h>
  21 #include <asm/asi.h>
  22 #include <asm/system.h>
  23 #include <asm/page.h>
  24 #include <asm/processor.h>
  25 #include <asm/const.h>
  26
  27 /* The kernel image occupies 0x4000000 to 0x1000000 (4MB --> 32MB).
  28  * The page copy blockops can use 0x2000000 to 0x10000000.
  29  * The PROM resides in an area spanning 0xf0000000 to 0x100000000.
  30  * The vmalloc area spans 0x100000000 to 0x200000000.
  31  * Since modules need to be in the lowest 32-bits of the address space,
  32  * we place them right before the OBP area from 0x10000000 to 0xf0000000.
  33  * There is a single static kernel PMD which maps from 0x0 to address
  34  * 0x400000000.
  35  */
  36 #define TLBTEMP_BASE            _AC(0x0000000002000000,UL)
  37 #define MODULES_VADDR           _AC(0x0000000010000000,UL)
  38 #define MODULES_LEN             _AC(0x00000000e0000000,UL)
  39 #define MODULES_END             _AC(0x00000000f0000000,UL)
  40 #define LOW_OBP_ADDRESS         _AC(0x00000000f0000000,UL)
  41 #define HI_OBP_ADDRESS          _AC(0x0000000100000000,UL)
  42 #define VMALLOC_START           _AC(0x0000000100000000,UL)
  43 #define VMALLOC_END             _AC(0x0000000200000000,UL)
  44
  45 /* XXX All of this needs to be rethought so we can take advantage
  46  * XXX cheetah's full 64-bit virtual address space, ie. no more hole
  47  * XXX in the middle like on spitfire. -DaveM
  48  */
  49 /*
  50  * Given a virtual address, the lowest PAGE_SHIFT bits determine offset
  51  * into the page; the next higher PAGE_SHIFT-3 bits determine the pte#
  52  * in the proper pagetable (the -3 is from the 8 byte ptes, and each page
  53  * table is a single page long). The next higher PMD_BITS determine pmd#
  54  * in the proper pmdtable (where we must have PMD_BITS <= (PAGE_SHIFT-2)
  55  * since the pmd entries are 4 bytes, and each pmd page is a single page
  56  * long). Finally, the higher few bits determine pgde#.
  57  */
  58
  59 /* PMD_SHIFT determines the size of the area a second-level page
  60  * table can map
  61  */
  62 #define PMD_SHIFT       (PAGE_SHIFT + (PAGE_SHIFT-3))
  63 #define PMD_SIZE        (_AC(1,UL) << PMD_SHIFT)
  64 #define PMD_MASK        (~(PMD_SIZE-1))
  65 #define PMD_BITS        (PAGE_SHIFT - 2)
  66
  67 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  68 #define PGDIR_SHIFT     (PAGE_SHIFT + (PAGE_SHIFT-3) + PMD_BITS)
  69 #define PGDIR_SIZE      (_AC(1,UL) << PGDIR_SHIFT)
  70 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  71 #define PGDIR_BITS      (PAGE_SHIFT - 2)
  72
  73 #ifndef __ASSEMBLY__
  74
  75 #include <linux/sched.h>
  76
  77 /* Entries per page directory level. */
  78 #define PTRS_PER_PTE    (1UL << (PAGE_SHIFT-3))
  79 #define PTRS_PER_PMD    (1UL << PMD_BITS)
  80 #define PTRS_PER_PGD    (1UL << PGDIR_BITS)
  81
  82 /* Kernel has a separate 44bit address space. */
  83 #define FIRST_USER_ADDRESS      0
  84
  85 #define pte_ERROR(e)    __builtin_trap()
  86 #define pmd_ERROR(e)    __builtin_trap()
  87 #define pgd_ERROR(e)    __builtin_trap()
  88
  89 #endif /* !(__ASSEMBLY__) */
  90
  91 /* Spitfire/Cheetah TTE bits. */
  92 #define _PAGE_VALID     _AC(0x8000000000000000,UL) /* Valid TTE              */
  93 #define _PAGE_R         _AC(0x8000000000000000,UL) /* Keep ref bit up to date*/
  94 #define _PAGE_SZ4MB     _AC(0x6000000000000000,UL) /* 4MB Page               */
  95 #define _PAGE_SZ512K    _AC(0x4000000000000000,UL) /* 512K Page              */
  96 #define _PAGE_SZ64K     _AC(0x2000000000000000,UL) /* 64K Page               */
  97 #define _PAGE_SZ8K      _AC(0x0000000000000000,UL) /* 8K Page                */
  98 #define _PAGE_NFO       _AC(0x1000000000000000,UL) /* No Fault Only          */
  99 #define _PAGE_IE        _AC(0x0800000000000000,UL) /* Invert Endianness      */
 100 #define _PAGE_SOFT2     _AC(0x07FC000000000000,UL) /* Software bits, set 2   */
 101 #define _PAGE_RES1      _AC(0x0002000000000000,UL) /* Reserved               */
 102 #define _PAGE_SZ32MB    _AC(0x0001000000000000,UL) /* (Panther) 32MB page    */
 103 #define _PAGE_SZ256MB   _AC(0x2001000000000000,UL) /* (Panther) 256MB page   */
 104 #define _PAGE_SN        _AC(0x0000800000000000,UL) /* (Cheetah) Snoop        */
 105 #define _PAGE_RES2      _AC(0x0000780000000000,UL) /* Reserved               */
 106 #define _PAGE_PADDR_SF  _AC(0x000001FFFFFFE000,UL) /* (Spitfire) paddr[40:13]*/
 107 #define _PAGE_PADDR     _AC(0x000007FFFFFFE000,UL) /* (Cheetah) paddr[42:13] */
 108 #define _PAGE_SOFT      _AC(0x0000000000001F80,UL) /* Software bits          */
 109 #define _PAGE_L         _AC(0x0000000000000040,UL) /* Locked TTE             */
 110 #define _PAGE_CP        _AC(0x0000000000000020,UL) /* Cacheable in P-Cache   */
 111 #define _PAGE_CV        _AC(0x0000000000000010,UL) /* Cacheable in V-Cache   */
 112 #define _PAGE_E         _AC(0x0000000000000008,UL) /* side-Effect            */
 113 #define _PAGE_P         _AC(0x0000000000000004,UL) /* Privileged Page        */
 114 #define _PAGE_W         _AC(0x0000000000000002,UL) /* Writable               */
 115 #define _PAGE_G         _AC(0x0000000000000001,UL) /* Global                 */
 116
 117 /* Here are the SpitFire software bits we use in the TTE's.
 118  *
 119  * WARNING: If you are going to try and start using some
 120  *          of the soft2 bits, you will need to make
 121  *          modifications to the swap entry implementation.
 122  *          For example, one thing that could happen is that
 123  *          swp_entry_to_pte() would BUG_ON() if you tried
 124  *          to use one of the soft2 bits for _PAGE_FILE.
 125  *
 126  * Like other architectures, I have aliased _PAGE_FILE with
 127  * _PAGE_MODIFIED.  This works because _PAGE_FILE is never
 128  * interpreted that way unless _PAGE_PRESENT is clear.
 129  */
 130 #define _PAGE_EXEC      _AC(0x0000000000001000,UL)      /* Executable SW bit */
 131 #define _PAGE_MODIFIED  _AC(0x0000000000000800,UL)      /* Modified (dirty)  */
 132 #define _PAGE_FILE      _AC(0x0000000000000800,UL)      /* Pagecache page    */
 133 #define _PAGE_ACCESSED  _AC(0x0000000000000400,UL)      /* Accessed (ref'd)  */
 134 #define _PAGE_READ      _AC(0x0000000000000200,UL)      /* Readable SW Bit   */
 135 #define _PAGE_WRITE     _AC(0x0000000000000100,UL)      /* Writable SW Bit   */
 136 #define _PAGE_PRESENT   _AC(0x0000000000000080,UL)      /* Present           */
 137
 138 #if PAGE_SHIFT == 13
 139 #define _PAGE_SZBITS    _PAGE_SZ8K
 140 #elif PAGE_SHIFT == 16
 141 #define _PAGE_SZBITS    _PAGE_SZ64K
 142 #elif PAGE_SHIFT == 19
 143 #define _PAGE_SZBITS    _PAGE_SZ512K
 144 #elif PAGE_SHIFT == 22
 145 #define _PAGE_SZBITS    _PAGE_SZ4MB
 146 #else
 147 #error Wrong PAGE_SHIFT specified
 148 #endif
 149
 150 #if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
 151 #define _PAGE_SZHUGE    _PAGE_SZ4MB
 152 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
 153 #define _PAGE_SZHUGE    _PAGE_SZ512K
 154 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 155 #define _PAGE_SZHUGE    _PAGE_SZ64K
 156 #endif
 157
 158 #define _PAGE_CACHE     (_PAGE_CP | _PAGE_CV)
 159
 160 #define __DIRTY_BITS    (_PAGE_MODIFIED | _PAGE_WRITE | _PAGE_W)
 161 #define __ACCESS_BITS   (_PAGE_ACCESSED | _PAGE_READ | _PAGE_R)
 162 #define __PRIV_BITS     _PAGE_P
 163
 164 #define PAGE_NONE       __pgprot (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_CACHE)
 165
 166 /* Don't set the TTE _PAGE_W bit here, else the dirty bit never gets set. */
 167 #define PAGE_SHARED     __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \
 168                                   __ACCESS_BITS | _PAGE_WRITE | _PAGE_EXEC)
 169
 170 #define PAGE_COPY       __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \
 171                                   __ACCESS_BITS | _PAGE_EXEC)
 172
 173 #define PAGE_READONLY   __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \
 174                                   __ACCESS_BITS | _PAGE_EXEC)
 175
 176 #define PAGE_KERNEL     __pgprot (_PAGE_PRESENT | _PAGE_VALID | _PAGE_CACHE | \
 177                                   __PRIV_BITS | \
 178                                   __ACCESS_BITS | __DIRTY_BITS | _PAGE_EXEC)
 179
 180 #define PAGE_SHARED_NOEXEC      __pgprot (_PAGE_PRESENT | _PAGE_VALID | \
 181                                           _PAGE_CACHE | \
 182                                           __ACCESS_BITS | _PAGE_WRITE)
 183
 184 #define PAGE_COPY_NOEXEC        __pgprot (_PAGE_PRESENT | _PAGE_VALID | \
 185                                           _PAGE_CACHE | __ACCESS_BITS)
 186
 187 #define PAGE_READONLY_NOEXEC    __pgprot (_PAGE_PRESENT | _PAGE_VALID | \
 188                                           _PAGE_CACHE | __ACCESS_BITS)
 189
 190 #define _PFN_MASK       _PAGE_PADDR
 191
 192 #define pg_iobits (_PAGE_VALID | _PAGE_PRESENT | __DIRTY_BITS | \
 193                    __ACCESS_BITS | _PAGE_E)
 194
 195 #define __P000  PAGE_NONE
 196 #define __P001  PAGE_READONLY_NOEXEC
 197 #define __P010  PAGE_COPY_NOEXEC
 198 #define __P011  PAGE_COPY_NOEXEC
 199 #define __P100  PAGE_READONLY
 200 #define __P101  PAGE_READONLY
 201 #define __P110  PAGE_COPY
 202 #define __P111  PAGE_COPY
 203
 204 #define __S000  PAGE_NONE
 205 #define __S001  PAGE_READONLY_NOEXEC
 206 #define __S010  PAGE_SHARED_NOEXEC
 207 #define __S011  PAGE_SHARED_NOEXEC
 208 #define __S100  PAGE_READONLY
 209 #define __S101  PAGE_READONLY
 210 #define __S110  PAGE_SHARED
 211 #define __S111  PAGE_SHARED
 212
 213 #ifndef __ASSEMBLY__
 214
 215 extern unsigned long phys_base;
 216 extern unsigned long pfn_base;
 217
 218 extern struct page *mem_map_zero;
 219 #define ZERO_PAGE(vaddr)        (mem_map_zero)
 220
 221 /* PFNs are real physical page numbers.  However, mem_map only begins to record
 222  * per-page information starting at pfn_base.  This is to handle systems where
 223  * the first physical page in the machine is at some huge physical address,
 224  * such as 4GB.   This is common on a partitioned E10000, for example.
 225  */
 226
 227 #define pfn_pte(pfn, prot)      \
 228         __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot) | _PAGE_SZBITS)
 229 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 230
 231 #define pte_pfn(x)              ((pte_val(x) & _PAGE_PADDR)>>PAGE_SHIFT)
 232 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 233
 234 static inline pte_t pte_modify(pte_t orig_pte, pgprot_t new_prot)
 235 {
 236         pte_t __pte;
 237         const unsigned long preserve_mask = (_PFN_MASK |
 238                                              _PAGE_MODIFIED | _PAGE_ACCESSED |
 239                                              _PAGE_CACHE | _PAGE_E |
 240                                              _PAGE_PRESENT | _PAGE_SZBITS);
 241
 242         pte_val(__pte) = (pte_val(orig_pte) & preserve_mask) |
 243                 (pgprot_val(new_prot) & ~preserve_mask);
 244
 245         return __pte;
 246 }
 247 #define pmd_set(pmdp, ptep)     \
 248         (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL))
 249 #define pud_set(pudp, pmdp)     \
 250         (pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> 11UL))
 251 #define __pmd_page(pmd)         \
 252         ((unsigned long) __va((((unsigned long)pmd_val(pmd))<<11UL)))
 253 #define pmd_page(pmd)                   virt_to_page((void *)__pmd_page(pmd))
 254 #define pud_page(pud)           \
 255         ((unsigned long) __va((((unsigned long)pud_val(pud))<<11UL)))
 256 #define pte_none(pte)                   (!pte_val(pte))
 257 #define pte_present(pte)                (pte_val(pte) & _PAGE_PRESENT)
 258 #define pmd_none(pmd)                   (!pmd_val(pmd))
 259 #define pmd_bad(pmd)                    (0)
 260 #define pmd_present(pmd)                (pmd_val(pmd) != 0U)
 261 #define pmd_clear(pmdp)                 (pmd_val(*(pmdp)) = 0U)
 262 #define pud_none(pud)                   (!pud_val(pud))
 263 #define pud_bad(pud)                    (0)
 264 #define pud_present(pud)                (pud_val(pud) != 0U)
 265 #define pud_clear(pudp)                 (pud_val(*(pudp)) = 0U)
 266
 267 /* The following only work if pte_present() is true.
 268  * Undefined behaviour if not..
 269  */
 270 #define pte_read(pte)           (pte_val(pte) & _PAGE_READ)
 271 #define pte_exec(pte)           (pte_val(pte) & _PAGE_EXEC)
 272 #define pte_write(pte)          (pte_val(pte) & _PAGE_WRITE)
 273 #define pte_dirty(pte)          (pte_val(pte) & _PAGE_MODIFIED)
 274 #define pte_young(pte)          (pte_val(pte) & _PAGE_ACCESSED)
 275 #define pte_wrprotect(pte)      (__pte(pte_val(pte) & ~(_PAGE_WRITE|_PAGE_W)))
 276 #define pte_rdprotect(pte)      \
 277         (__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_READ))
 278 #define pte_mkclean(pte)        \
 279         (__pte(pte_val(pte) & ~(_PAGE_MODIFIED|_PAGE_W)))
 280 #define pte_mkold(pte)          \
 281         (__pte(((pte_val(pte)<<1UL)>>1UL) & ~_PAGE_ACCESSED))
 282
 283 /* Permanent address of a page. */
 284 #define __page_address(page)    page_address(page)
 285
 286 /* Be very careful when you change these three, they are delicate. */
 287 #define pte_mkyoung(pte)        (__pte(pte_val(pte) | _PAGE_ACCESSED | _PAGE_R))
 288 #define pte_mkwrite(pte)        (__pte(pte_val(pte) | _PAGE_WRITE))
 289 #define pte_mkdirty(pte)        (__pte(pte_val(pte) | _PAGE_MODIFIED | _PAGE_W))
 290 #define pte_mkhuge(pte)         (__pte(pte_val(pte) | _PAGE_SZHUGE))
 291
 292 /* to find an entry in a page-table-directory. */
 293 #define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 294 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 295
 296 /* to find an entry in a kernel page-table-directory */
 297 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 298
 299 /* extract the pgd cache used for optimizing the tlb miss
 300  * slow path when executing 32-bit compat processes
 301  */
 302 #define get_pgd_cache(pgd)      ((unsigned long) pgd_val(*pgd) << 11)
 303
 304 /* Find an entry in the second-level page table.. */
 305 #define pmd_offset(pudp, address)       \
 306         ((pmd_t *) pud_page(*(pudp)) + \
 307          (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)))
 308
 309 /* Find an entry in the third-level page table.. */
 310 #define pte_index(dir, address) \
 311         ((pte_t *) __pmd_page(*(dir)) + \
 312          ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 313 #define pte_offset_kernel               pte_index
 314 #define pte_offset_map                  pte_index
 315 #define pte_offset_map_nested           pte_index
 316 #define pte_unmap(pte)                  do { } while (0)
 317 #define pte_unmap_nested(pte)           do { } while (0)
 318
 319 /* Actual page table PTE updates.  */
 320 extern void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig);
 321
 322 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
 323 {
 324         pte_t orig = *ptep;
 325
 326         *ptep = pte;
 327
 328         /* It is more efficient to let flush_tlb_kernel_range()
 329          * handle init_mm tlb flushes.
 330          */
 331         if (likely(mm != &init_mm) && (pte_val(orig) & _PAGE_VALID))
 332                 tlb_batch_add(mm, addr, ptep, orig);
 333 }
 334
 335 #define pte_clear(mm,addr,ptep)         \
 336         set_pte_at((mm), (addr), (ptep), __pte(0UL))
 337
 338 #ifdef DCACHE_ALIASING_POSSIBLE
 339 #define __HAVE_ARCH_MOVE_PTE
 340 #define move_pte(pte, prot, old_addr, new_addr)                         \
 341 ({                                                                      \
 342         pte_t newpte = (pte);                                           \
 343         if (pte_present(pte)) {                                         \
 344                 unsigned long this_pfn = pte_pfn(pte);                  \
 345                                                                         \
 346                 if (pfn_valid(this_pfn) &&                              \
 347                     (((old_addr) ^ (new_addr)) & (1 << 13)))            \
 348                         flush_dcache_page_all(current->mm,              \
 349                                               pfn_to_page(this_pfn));   \
 350         }                                                               \
 351         newpte;                                                         \
 352 })
 353 #endif
 354
 355 extern pgd_t swapper_pg_dir[2048];
 356 extern pmd_t swapper_low_pmd_dir[2048];
 357
 358 extern void paging_init(void);
 359 extern unsigned long find_ecache_flush_span(unsigned long size);
 360
 361 /* These do nothing with the way I have things setup. */
 362 #define mmu_lockarea(vaddr, len)                (vaddr)
 363 #define mmu_unlockarea(vaddr, len)              do { } while(0)
 364
 365 struct vm_area_struct;
 366 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
 367
 368 /* Encode and de-code a swap entry */
 369 #define __swp_type(entry)       (((entry).val >> PAGE_SHIFT) & 0xffUL)
 370 #define __swp_offset(entry)     ((entry).val >> (PAGE_SHIFT + 8UL))
 371 #define __swp_entry(type, offset)       \
 372         ( (swp_entry_t) \
 373           { \
 374                 (((long)(type) << PAGE_SHIFT) | \
 375                  ((long)(offset) << (PAGE_SHIFT + 8UL))) \
 376           } )
 377 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 378 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 379
 380 /* File offset in PTE support. */
 381 #define pte_file(pte)           (pte_val(pte) & _PAGE_FILE)
 382 #define pte_to_pgoff(pte)       (pte_val(pte) >> PAGE_SHIFT)
 383 #define pgoff_to_pte(off)       (__pte(((off) << PAGE_SHIFT) | _PAGE_FILE))
 384 #define PTE_FILE_MAX_BITS       (64UL - PAGE_SHIFT - 1UL)
 385
 386 extern unsigned long prom_virt_to_phys(unsigned long, int *);
 387
 388 static __inline__ unsigned long
 389 sun4u_get_pte (unsigned long addr)
 390 {
 391         pgd_t *pgdp;
 392         pud_t *pudp;
 393         pmd_t *pmdp;
 394         pte_t *ptep;
 395
 396         if (addr >= PAGE_OFFSET)
 397                 return addr & _PAGE_PADDR;
 398         if ((addr >= LOW_OBP_ADDRESS) && (addr < HI_OBP_ADDRESS))
 399                 return prom_virt_to_phys(addr, NULL);
 400         pgdp = pgd_offset_k(addr);
 401         pudp = pud_offset(pgdp, addr);
 402         pmdp = pmd_offset(pudp, addr);
 403         ptep = pte_offset_kernel(pmdp, addr);
 404         return pte_val(*ptep) & _PAGE_PADDR;
 405 }
 406
 407 static __inline__ unsigned long
 408 __get_phys (unsigned long addr)
 409 {
 410         return sun4u_get_pte (addr);
 411 }
 412
 413 static __inline__ int
 414 __get_iospace (unsigned long addr)
 415 {
 416         return ((sun4u_get_pte (addr) & 0xf0000000) >> 28);
 417 }
 418
 419 extern unsigned long *sparc64_valid_addr_bitmap;
 420
 421 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 422 #define kern_addr_valid(addr)   \
 423         (test_bit(__pa((unsigned long)(addr))>>22, sparc64_valid_addr_bitmap))
 424
 425 extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
 426                                unsigned long pfn,
 427                                unsigned long size, pgprot_t prot);
 428
 429 /* Clear virtual and physical cachability, set side-effect bit.  */
 430 #define pgprot_noncached(prot) \
 431         (__pgprot((pgprot_val(prot) & ~(_PAGE_CP | _PAGE_CV)) | \
 432          _PAGE_E))
 433
 434 /*
 435  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 436  * its high 4 bits.  These macros/functions put it there or get it from there.
 437  */
 438 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 439 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 440 #define GET_PFN(pfn)                    (pfn & 0x0fffffffffffffffUL)
 441
 442 #include <asm-generic/pgtable.h>
 443
 444 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 445 #define HAVE_ARCH_UNMAPPED_AREA
 446
 447 /* We provide a special get_unmapped_area for framebuffer mmaps to try and use
 448  * the largest alignment possible such that larget PTEs can be used.
 449  */
 450 extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
 451                                           unsigned long, unsigned long,
 452                                           unsigned long);
 453 #define HAVE_ARCH_FB_UNMAPPED_AREA
 454
 455 /*
 456  * No page table caches to initialise
 457  */
 458 #define pgtable_cache_init()    do { } while (0)
 459
 460 extern void check_pgt_cache(void);
 461
 462 #endif /* !(__ASSEMBLY__) */
 463
 464 #endif /* !(_SPARC64_PGTABLE_H) */