include/asm-ia64/pgtable.h

   1 #ifndef _ASM_IA64_PGTABLE_H
   2 #define _ASM_IA64_PGTABLE_H
   3
   4 /*
   5  * This file contains the functions and defines necessary to modify and use
   6  * the IA-64 page table tree.
   7  *
   8  * This hopefully works with any (fixed) IA-64 page-size, as defined
   9  * in <asm/page.h>.
  10  *
  11  * Copyright (C) 1998-2004 Hewlett-Packard Co
  12  *      David Mosberger-Tang <davidm@hpl.hp.com>
  13  */
  14
  15 #include <linux/config.h>
  16
  17 #include <asm/mman.h>
  18 #include <asm/page.h>
  19 #include <asm/processor.h>
  20 #include <asm/system.h>
  21 #include <asm/types.h>
  22
  23 #define IA64_MAX_PHYS_BITS      50      /* max. number of physical address bits (architected) */
  24
  25 /*
  26  * First, define the various bits in a PTE.  Note that the PTE format
  27  * matches the VHPT short format, the firt doubleword of the VHPD long
  28  * format, and the first doubleword of the TLB insertion format.
  29  */
  30 #define _PAGE_P_BIT             0
  31 #define _PAGE_A_BIT             5
  32 #define _PAGE_D_BIT             6
  33
  34 #define _PAGE_P                 (1 << _PAGE_P_BIT)      /* page present bit */
  35 #define _PAGE_MA_WB             (0x0 <<  2)     /* write back memory attribute */
  36 #define _PAGE_MA_UC             (0x4 <<  2)     /* uncacheable memory attribute */
  37 #define _PAGE_MA_UCE            (0x5 <<  2)     /* UC exported attribute */
  38 #define _PAGE_MA_WC             (0x6 <<  2)     /* write coalescing memory attribute */
  39 #define _PAGE_MA_NAT            (0x7 <<  2)     /* not-a-thing attribute */
  40 #define _PAGE_MA_MASK           (0x7 <<  2)
  41 #define _PAGE_PL_0              (0 <<  7)       /* privilege level 0 (kernel) */
  42 #define _PAGE_PL_1              (1 <<  7)       /* privilege level 1 (unused) */
  43 #define _PAGE_PL_2              (2 <<  7)       /* privilege level 2 (unused) */
  44 #define _PAGE_PL_3              (3 <<  7)       /* privilege level 3 (user) */
  45 #define _PAGE_PL_MASK           (3 <<  7)
  46 #define _PAGE_AR_R              (0 <<  9)       /* read only */
  47 #define _PAGE_AR_RX             (1 <<  9)       /* read & execute */
  48 #define _PAGE_AR_RW             (2 <<  9)       /* read & write */
  49 #define _PAGE_AR_RWX            (3 <<  9)       /* read, write & execute */
  50 #define _PAGE_AR_R_RW           (4 <<  9)       /* read / read & write */
  51 #define _PAGE_AR_RX_RWX         (5 <<  9)       /* read & exec / read, write & exec */
  52 #define _PAGE_AR_RWX_RW         (6 <<  9)       /* read, write & exec / read & write */
  53 #define _PAGE_AR_X_RX           (7 <<  9)       /* exec & promote / read & exec */
  54 #define _PAGE_AR_MASK           (7 <<  9)
  55 #define _PAGE_AR_SHIFT          9
  56 #define _PAGE_A                 (1 << _PAGE_A_BIT)      /* page accessed bit */
  57 #define _PAGE_D                 (1 << _PAGE_D_BIT)      /* page dirty bit */
  58 #define _PAGE_PPN_MASK          (((__IA64_UL(1) << IA64_MAX_PHYS_BITS) - 1) & ~0xfffUL)
  59 #define _PAGE_ED                (__IA64_UL(1) << 52)    /* exception deferral */
  60 #define _PAGE_PROTNONE          (__IA64_UL(1) << 63)
  61
  62 /* Valid only for a PTE with the present bit cleared: */
  63 #define _PAGE_FILE              (1 << 1)                /* see swap & file pte remarks below */
  64
  65 #define _PFN_MASK               _PAGE_PPN_MASK
  66 /* Mask of bits which may be changed by pte_modify(); the odd bits are there for _PAGE_PROTNONE */
  67 #define _PAGE_CHG_MASK  (_PAGE_P | _PAGE_PROTNONE | _PAGE_PL_MASK | _PAGE_AR_MASK | _PAGE_ED)
  68
  69 #define _PAGE_SIZE_4K   12
  70 #define _PAGE_SIZE_8K   13
  71 #define _PAGE_SIZE_16K  14
  72 #define _PAGE_SIZE_64K  16
  73 #define _PAGE_SIZE_256K 18
  74 #define _PAGE_SIZE_1M   20
  75 #define _PAGE_SIZE_4M   22
  76 #define _PAGE_SIZE_16M  24
  77 #define _PAGE_SIZE_64M  26
  78 #define _PAGE_SIZE_256M 28
  79 #define _PAGE_SIZE_1G   30
  80 #define _PAGE_SIZE_4G   32
  81
  82 #define __ACCESS_BITS           _PAGE_ED | _PAGE_A | _PAGE_P | _PAGE_MA_WB
  83 #define __DIRTY_BITS_NO_ED      _PAGE_A | _PAGE_P | _PAGE_D | _PAGE_MA_WB
  84 #define __DIRTY_BITS            _PAGE_ED | __DIRTY_BITS_NO_ED
  85
  86 /*
  87  * Definitions for first level:
  88  *
  89  * PGDIR_SHIFT determines what a first-level page table entry can map.
  90  */
  91 #define PGDIR_SHIFT             (PAGE_SHIFT + 2*(PAGE_SHIFT-3))
  92 #define PGDIR_SIZE              (__IA64_UL(1) << PGDIR_SHIFT)
  93 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
  94 #define PTRS_PER_PGD            (1UL << (PAGE_SHIFT-3))
  95 #define USER_PTRS_PER_PGD       (5*PTRS_PER_PGD/8)      /* regions 0-4 are user regions */
  96 #define FIRST_USER_ADDRESS      0
  97
  98 /*
  99  * Definitions for second level:
 100  *
 101  * PMD_SHIFT determines the size of the area a second-level page table
 102  * can map.
 103  */
 104 #define PMD_SHIFT       (PAGE_SHIFT + (PAGE_SHIFT-3))
 105 #define PMD_SIZE        (1UL << PMD_SHIFT)
 106 #define PMD_MASK        (~(PMD_SIZE-1))
 107 #define PTRS_PER_PMD    (1UL << (PAGE_SHIFT-3))
 108
 109 /*
 110  * Definitions for third level:
 111  */
 112 #define PTRS_PER_PTE    (__IA64_UL(1) << (PAGE_SHIFT-3))
 113
 114 /*
 115  * All the normal masks have the "page accessed" bits on, as any time
 116  * they are used, the page is accessed. They are cleared only by the
 117  * page-out routines.
 118  */
 119 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_A)
 120 #define PAGE_SHARED     __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RW)
 121 #define PAGE_READONLY   __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_R)
 122 #define PAGE_COPY       __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_R)
 123 #define PAGE_COPY_EXEC  __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX)
 124 #define PAGE_GATE       __pgprot(__ACCESS_BITS | _PAGE_PL_0 | _PAGE_AR_X_RX)
 125 #define PAGE_KERNEL     __pgprot(__DIRTY_BITS  | _PAGE_PL_0 | _PAGE_AR_RWX)
 126 #define PAGE_KERNELRX   __pgprot(__ACCESS_BITS | _PAGE_PL_0 | _PAGE_AR_RX)
 127
 128 # ifndef __ASSEMBLY__
 129
 130 #include <asm/bitops.h>
 131 #include <asm/cacheflush.h>
 132 #include <asm/mmu_context.h>
 133 #include <asm/processor.h>
 134
 135 /*
 136  * Next come the mappings that determine how mmap() protection bits
 137  * (PROT_EXEC, PROT_READ, PROT_WRITE, PROT_NONE) get implemented.  The
 138  * _P version gets used for a private shared memory segment, the _S
 139  * version gets used for a shared memory segment with MAP_SHARED on.
 140  * In a private shared memory segment, we do a copy-on-write if a task
 141  * attempts to write to the page.
 142  */
 143         /* xwr */
 144 #define __P000  PAGE_NONE
 145 #define __P001  PAGE_READONLY
 146 #define __P010  PAGE_READONLY   /* write to priv pg -> copy & make writable */
 147 #define __P011  PAGE_READONLY   /* ditto */
 148 #define __P100  __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX)
 149 #define __P101  __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX)
 150 #define __P110  PAGE_COPY_EXEC
 151 #define __P111  PAGE_COPY_EXEC
 152
 153 #define __S000  PAGE_NONE
 154 #define __S001  PAGE_READONLY
 155 #define __S010  PAGE_SHARED     /* we don't have (and don't need) write-only */
 156 #define __S011  PAGE_SHARED
 157 #define __S100  __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_X_RX)
 158 #define __S101  __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX)
 159 #define __S110  __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX)
 160 #define __S111  __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RWX)
 161
 162 #define pgd_ERROR(e)    printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
 163 #define pmd_ERROR(e)    printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
 164 #define pte_ERROR(e)    printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
 165
 166
 167 /*
 168  * Some definitions to translate between mem_map, PTEs, and page addresses:
 169  */
 170
 171
 172 /* Quick test to see if ADDR is a (potentially) valid physical address. */
 173 static inline long
 174 ia64_phys_addr_valid (unsigned long addr)
 175 {
 176         return (addr & (local_cpu_data->unimpl_pa_mask)) == 0;
 177 }
 178
 179 /*
 180  * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel
 181  * memory.  For the return value to be meaningful, ADDR must be >=
 182  * PAGE_OFFSET.  This operation can be relatively expensive (e.g.,
 183  * require a hash-, or multi-level tree-lookup or something of that
 184  * sort) but it guarantees to return TRUE only if accessing the page
 185  * at that address does not cause an error.  Note that there may be
 186  * addresses for which kern_addr_valid() returns FALSE even though an
 187  * access would not cause an error (e.g., this is typically true for
 188  * memory mapped I/O regions.
 189  *
 190  * XXX Need to implement this for IA-64.
 191  */
 192 #define kern_addr_valid(addr)   (1)
 193
 194
 195 /*
 196  * Now come the defines and routines to manage and access the three-level
 197  * page table.
 198  */
 199
 200 /*
 201  * On some architectures, special things need to be done when setting
 202  * the PTE in a page table.  Nothing special needs to be on IA-64.
 203  */
 204 #define set_pte(ptep, pteval)   (*(ptep) = (pteval))
 205 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 206
 207 #define RGN_SIZE        (1UL << 61)
 208 #define RGN_KERNEL      7
 209
 210 #define VMALLOC_START           0xa000000200000000UL
 211 #ifdef CONFIG_VIRTUAL_MEM_MAP
 212 # define VMALLOC_END_INIT       (0xa000000000000000UL + (1UL << (4*PAGE_SHIFT - 9)))
 213 # define VMALLOC_END            vmalloc_end
 214   extern unsigned long vmalloc_end;
 215 #else
 216 # define VMALLOC_END            (0xa000000000000000UL + (1UL << (4*PAGE_SHIFT - 9)))
 217 #endif
 218
 219 /* fs/proc/kcore.c */
 220 #define kc_vaddr_to_offset(v) ((v) - 0xa000000000000000UL)
 221 #define kc_offset_to_vaddr(o) ((o) + 0xa000000000000000UL)
 222
 223 /*
 224  * Conversion functions: convert page frame number (pfn) and a protection value to a page
 225  * table entry (pte).
 226  */
 227 #define pfn_pte(pfn, pgprot) \
 228 ({ pte_t __pte; pte_val(__pte) = ((pfn) << PAGE_SHIFT) | pgprot_val(pgprot); __pte; })
 229
 230 /* Extract pfn from pte.  */
 231 #define pte_pfn(_pte)           ((pte_val(_pte) & _PFN_MASK) >> PAGE_SHIFT)
 232
 233 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 234
 235 /* This takes a physical page address that is used by the remapping functions */
 236 #define mk_pte_phys(physpage, pgprot) \
 237 ({ pte_t __pte; pte_val(__pte) = physpage + pgprot_val(pgprot); __pte; })
 238
 239 #define pte_modify(_pte, newprot) \
 240         (__pte((pte_val(_pte) & ~_PAGE_CHG_MASK) | (pgprot_val(newprot) & _PAGE_CHG_MASK)))
 241
 242 #define page_pte_prot(page,prot)        mk_pte(page, prot)
 243 #define page_pte(page)                  page_pte_prot(page, __pgprot(0))
 244
 245 #define pte_none(pte)                   (!pte_val(pte))
 246 #define pte_present(pte)                (pte_val(pte) & (_PAGE_P | _PAGE_PROTNONE))
 247 #define pte_clear(mm,addr,pte)          (pte_val(*(pte)) = 0UL)
 248 /* pte_page() returns the "struct page *" corresponding to the PTE: */
 249 #define pte_page(pte)                   virt_to_page(((pte_val(pte) & _PFN_MASK) + PAGE_OFFSET))
 250
 251 #define pmd_none(pmd)                   (!pmd_val(pmd))
 252 #define pmd_bad(pmd)                    (!ia64_phys_addr_valid(pmd_val(pmd)))
 253 #define pmd_present(pmd)                (pmd_val(pmd) != 0UL)
 254 #define pmd_clear(pmdp)                 (pmd_val(*(pmdp)) = 0UL)
 255 #define pmd_page_kernel(pmd)            ((unsigned long) __va(pmd_val(pmd) & _PFN_MASK))
 256 #define pmd_page(pmd)                   virt_to_page((pmd_val(pmd) + PAGE_OFFSET))
 257
 258 #define pud_none(pud)                   (!pud_val(pud))
 259 #define pud_bad(pud)                    (!ia64_phys_addr_valid(pud_val(pud)))
 260 #define pud_present(pud)                (pud_val(pud) != 0UL)
 261 #define pud_clear(pudp)                 (pud_val(*(pudp)) = 0UL)
 262
 263 #define pud_page(pud)                   ((unsigned long) __va(pud_val(pud) & _PFN_MASK))
 264
 265 /*
 266  * The following have defined behavior only work if pte_present() is true.
 267  */
 268 #define pte_user(pte)           ((pte_val(pte) & _PAGE_PL_MASK) == _PAGE_PL_3)
 269 #define pte_read(pte)           (((pte_val(pte) & _PAGE_AR_MASK) >> _PAGE_AR_SHIFT) < 6)
 270 #define pte_write(pte)  ((unsigned) (((pte_val(pte) & _PAGE_AR_MASK) >> _PAGE_AR_SHIFT) - 2) <= 4)
 271 #define pte_exec(pte)           ((pte_val(pte) & _PAGE_AR_RX) != 0)
 272 #define pte_dirty(pte)          ((pte_val(pte) & _PAGE_D) != 0)
 273 #define pte_young(pte)          ((pte_val(pte) & _PAGE_A) != 0)
 274 #define pte_file(pte)           ((pte_val(pte) & _PAGE_FILE) != 0)
 275 /*
 276  * Note: we convert AR_RWX to AR_RX and AR_RW to AR_R by clearing the 2nd bit in the
 277  * access rights:
 278  */
 279 #define pte_wrprotect(pte)      (__pte(pte_val(pte) & ~_PAGE_AR_RW))
 280 #define pte_mkwrite(pte)        (__pte(pte_val(pte) | _PAGE_AR_RW))
 281 #define pte_mkexec(pte)         (__pte(pte_val(pte) | _PAGE_AR_RX))
 282 #define pte_mkold(pte)          (__pte(pte_val(pte) & ~_PAGE_A))
 283 #define pte_mkyoung(pte)        (__pte(pte_val(pte) | _PAGE_A))
 284 #define pte_mkclean(pte)        (__pte(pte_val(pte) & ~_PAGE_D))
 285 #define pte_mkdirty(pte)        (__pte(pte_val(pte) | _PAGE_D))
 286
 287 /*
 288  * Macro to a page protection value as "uncacheable".  Note that "protection" is really a
 289  * misnomer here as the protection value contains the memory attribute bits, dirty bits,
 290  * and various other bits as well.
 291  */
 292 #define pgprot_noncached(prot)          __pgprot((pgprot_val(prot) & ~_PAGE_MA_MASK) | _PAGE_MA_UC)
 293
 294 /*
 295  * Macro to make mark a page protection value as "write-combining".
 296  * Note that "protection" is really a misnomer here as the protection
 297  * value contains the memory attribute bits, dirty bits, and various
 298  * other bits as well.  Accesses through a write-combining translation
 299  * works bypasses the caches, but does allow for consecutive writes to
 300  * be combined into single (but larger) write transactions.
 301  */
 302 #define pgprot_writecombine(prot)       __pgprot((pgprot_val(prot) & ~_PAGE_MA_MASK) | _PAGE_MA_WC)
 303
 304 static inline unsigned long
 305 pgd_index (unsigned long address)
 306 {
 307         unsigned long region = address >> 61;
 308         unsigned long l1index = (address >> PGDIR_SHIFT) & ((PTRS_PER_PGD >> 3) - 1);
 309
 310         return (region << (PAGE_SHIFT - 6)) | l1index;
 311 }
 312
 313 /* The offset in the 1-level directory is given by the 3 region bits
 314    (61..63) and the level-1 bits.  */
 315 static inline pgd_t*
 316 pgd_offset (struct mm_struct *mm, unsigned long address)
 317 {
 318         return mm->pgd + pgd_index(address);
 319 }
 320
 321 /* In the kernel's mapped region we completely ignore the region number
 322    (since we know it's in region number 5). */
 323 #define pgd_offset_k(addr) \
 324         (init_mm.pgd + (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)))
 325
 326 /* Look up a pgd entry in the gate area.  On IA-64, the gate-area
 327    resides in the kernel-mapped segment, hence we use pgd_offset_k()
 328    here.  */
 329 #define pgd_offset_gate(mm, addr)       pgd_offset_k(addr)
 330
 331 /* Find an entry in the second-level page table.. */
 332 #define pmd_offset(dir,addr) \
 333         ((pmd_t *) pud_page(*(dir)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
 334
 335 /*
 336  * Find an entry in the third-level page table.  This looks more complicated than it
 337  * should be because some platforms place page tables in high memory.
 338  */
 339 #define pte_index(addr)         (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 340 #define pte_offset_kernel(dir,addr)     ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(addr))
 341 #define pte_offset_map(dir,addr)        pte_offset_kernel(dir, addr)
 342 #define pte_offset_map_nested(dir,addr) pte_offset_map(dir, addr)
 343 #define pte_unmap(pte)                  do { } while (0)
 344 #define pte_unmap_nested(pte)           do { } while (0)
 345
 346 /* atomic versions of the some PTE manipulations: */
 347
 348 static inline int
 349 ptep_test_and_clear_young (struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 350 {
 351 #ifdef CONFIG_SMP
 352         if (!pte_young(*ptep))
 353                 return 0;
 354         return test_and_clear_bit(_PAGE_A_BIT, ptep);
 355 #else
 356         pte_t pte = *ptep;
 357         if (!pte_young(pte))
 358                 return 0;
 359         set_pte_at(vma->vm_mm, addr, ptep, pte_mkold(pte));
 360         return 1;
 361 #endif
 362 }
 363
 364 static inline int
 365 ptep_test_and_clear_dirty (struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 366 {
 367 #ifdef CONFIG_SMP
 368         if (!pte_dirty(*ptep))
 369                 return 0;
 370         return test_and_clear_bit(_PAGE_D_BIT, ptep);
 371 #else
 372         pte_t pte = *ptep;
 373         if (!pte_dirty(pte))
 374                 return 0;
 375         set_pte_at(vma->vm_mm, addr, ptep, pte_mkclean(pte));
 376         return 1;
 377 #endif
 378 }
 379
 380 static inline pte_t
 381 ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 382 {
 383 #ifdef CONFIG_SMP
 384         return __pte(xchg((long *) ptep, 0));
 385 #else
 386         pte_t pte = *ptep;
 387         pte_clear(mm, addr, ptep);
 388         return pte;
 389 #endif
 390 }
 391
 392 static inline void
 393 ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 394 {
 395 #ifdef CONFIG_SMP
 396         unsigned long new, old;
 397
 398         do {
 399                 old = pte_val(*ptep);
 400                 new = pte_val(pte_wrprotect(__pte (old)));
 401         } while (cmpxchg((unsigned long *) ptep, old, new) != old);
 402 #else
 403         pte_t old_pte = *ptep;
 404         set_pte_at(mm, addr, ptep, pte_wrprotect(old_pte));
 405 #endif
 406 }
 407
 408 static inline int
 409 pte_same (pte_t a, pte_t b)
 410 {
 411         return pte_val(a) == pte_val(b);
 412 }
 413
 414 #define update_mmu_cache(vma, address, pte) do { } while (0)
 415
 416 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 417 extern void paging_init (void);
 418
 419 /*
 420  * Note: The macros below rely on the fact that MAX_SWAPFILES_SHIFT <= number of
 421  *       bits in the swap-type field of the swap pte.  It would be nice to
 422  *       enforce that, but we can't easily include <linux/swap.h> here.
 423  *       (Of course, better still would be to define MAX_SWAPFILES_SHIFT here...).
 424  *
 425  * Format of swap pte:
 426  *      bit   0   : present bit (must be zero)
 427  *      bit   1   : _PAGE_FILE (must be zero)
 428  *      bits  2- 8: swap-type
 429  *      bits  9-62: swap offset
 430  *      bit  63   : _PAGE_PROTNONE bit
 431  *
 432  * Format of file pte:
 433  *      bit   0   : present bit (must be zero)
 434  *      bit   1   : _PAGE_FILE (must be one)
 435  *      bits  2-62: file_offset/PAGE_SIZE
 436  *      bit  63   : _PAGE_PROTNONE bit
 437  */
 438 #define __swp_type(entry)               (((entry).val >> 2) & 0x7f)
 439 #define __swp_offset(entry)             (((entry).val << 1) >> 10)
 440 #define __swp_entry(type,offset)        ((swp_entry_t) { ((type) << 2) | ((long) (offset) << 9) })
 441 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 442 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 443
 444 #define PTE_FILE_MAX_BITS               61
 445 #define pte_to_pgoff(pte)               ((pte_val(pte) << 1) >> 3)
 446 #define pgoff_to_pte(off)               ((pte_t) { ((off) << 2) | _PAGE_FILE })
 447
 448 /* XXX is this right? */
 449 #define io_remap_page_range(vma, vaddr, paddr, size, prot)              \
 450                 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
 451
 452 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 453                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 454
 455 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 456 #define GET_IOSPACE(pfn)                0
 457 #define GET_PFN(pfn)                    (pfn)
 458
 459 /*
 460  * ZERO_PAGE is a global shared page that is always zero: used
 461  * for zero-mapped memory areas etc..
 462  */
 463 extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
 464 extern struct page *zero_page_memmap_ptr;
 465 #define ZERO_PAGE(vaddr) (zero_page_memmap_ptr)
 466
 467 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 468 #define HAVE_ARCH_UNMAPPED_AREA
 469
 470 #ifdef CONFIG_HUGETLB_PAGE
 471 #define HUGETLB_PGDIR_SHIFT     (HPAGE_SHIFT + 2*(PAGE_SHIFT-3))
 472 #define HUGETLB_PGDIR_SIZE      (__IA64_UL(1) << HUGETLB_PGDIR_SHIFT)
 473 #define HUGETLB_PGDIR_MASK      (~(HUGETLB_PGDIR_SIZE-1))
 474 struct mmu_gather;
 475 void hugetlb_free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
 476                 unsigned long end, unsigned long floor, unsigned long ceiling);
 477 #endif
 478
 479 /*
 480  * IA-64 doesn't have any external MMU info: the page tables contain all the necessary
 481  * information.  However, we use this routine to take care of any (delayed) i-cache
 482  * flushing that may be necessary.
 483  */
 484 extern void lazy_mmu_prot_update (pte_t pte);
 485
 486 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 487 /*
 488  * Update PTEP with ENTRY, which is guaranteed to be a less
 489  * restrictive PTE.  That is, ENTRY may have the ACCESSED, DIRTY, and
 490  * WRITABLE bits turned on, when the value at PTEP did not.  The
 491  * WRITABLE bit may only be turned if SAFELY_WRITABLE is TRUE.
 492  *
 493  * SAFELY_WRITABLE is TRUE if we can update the value at PTEP without
 494  * having to worry about races.  On SMP machines, there are only two
 495  * cases where this is true:
 496  *
 497  *      (1) *PTEP has the PRESENT bit turned OFF
 498  *      (2) ENTRY has the DIRTY bit turned ON
 499  *
 500  * On ia64, we could implement this routine with a cmpxchg()-loop
 501  * which ORs in the _PAGE_A/_PAGE_D bit if they're set in ENTRY.
 502  * However, like on x86, we can get a more streamlined version by
 503  * observing that it is OK to drop ACCESSED bit updates when
 504  * SAFELY_WRITABLE is FALSE.  Besides being rare, all that would do is
 505  * result in an extra Access-bit fault, which would then turn on the
 506  * ACCESSED bit in the low-level fault handler (iaccess_bit or
 507  * daccess_bit in ivt.S).
 508  */
 509 #ifdef CONFIG_SMP
 510 # define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable)       \
 511 do {                                                                                    \
 512         if (__safely_writable) {                                                        \
 513                 set_pte(__ptep, __entry);                                               \
 514                 flush_tlb_page(__vma, __addr);                                          \
 515         }                                                                               \
 516 } while (0)
 517 #else
 518 # define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable)       \
 519         ptep_establish(__vma, __addr, __ptep, __entry)
 520 #endif
 521
 522 #  ifdef CONFIG_VIRTUAL_MEM_MAP
 523   /* arch mem_map init routine is needed due to holes in a virtual mem_map */
 524 #   define __HAVE_ARCH_MEMMAP_INIT
 525     extern void memmap_init (unsigned long size, int nid, unsigned long zone,
 526                              unsigned long start_pfn);
 527 #  endif /* CONFIG_VIRTUAL_MEM_MAP */
 528 # endif /* !__ASSEMBLY__ */
 529
 530 /*
 531  * Identity-mapped regions use a large page size.  We'll call such large pages
 532  * "granules".  If you can think of a better name that's unambiguous, let me
 533  * know...
 534  */
 535 #if defined(CONFIG_IA64_GRANULE_64MB)
 536 # define IA64_GRANULE_SHIFT     _PAGE_SIZE_64M
 537 #elif defined(CONFIG_IA64_GRANULE_16MB)
 538 # define IA64_GRANULE_SHIFT     _PAGE_SIZE_16M
 539 #endif
 540 #define IA64_GRANULE_SIZE       (1 << IA64_GRANULE_SHIFT)
 541 /*
 542  * log2() of the page size we use to map the kernel image (IA64_TR_KERNEL):
 543  */
 544 #define KERNEL_TR_PAGE_SHIFT    _PAGE_SIZE_64M
 545 #define KERNEL_TR_PAGE_SIZE     (1 << KERNEL_TR_PAGE_SHIFT)
 546
 547 /*
 548  * No page table caches to initialise
 549  */
 550 #define pgtable_cache_init()    do { } while (0)
 551
 552 /* These tell get_user_pages() that the first gate page is accessible from user-level.  */
 553 #define FIXADDR_USER_START      GATE_ADDR
 554 #define FIXADDR_USER_END        (GATE_ADDR + 2*PERCPU_PAGE_SIZE)
 555
 556 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 557 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 558 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 559 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 560 #define __HAVE_ARCH_PTE_SAME
 561 #define __HAVE_ARCH_PGD_OFFSET_GATE
 562 #define __HAVE_ARCH_LAZY_MMU_PROT_UPDATE
 563
 564 #include <asm-generic/pgtable-nopud.h>
 565 #include <asm-generic/pgtable.h>
 566
 567 #endif /* _ASM_IA64_PGTABLE_H */