arch/sh/include/asm/pgtable_32.h

   1 #ifndef __ASM_SH_PGTABLE_32_H
   2 #define __ASM_SH_PGTABLE_32_H
   3
   4 /*
   5  * Linux PTEL encoding.
   6  *
   7  * Hardware and software bit definitions for the PTEL value (see below for
   8  * notes on SH-X2 MMUs and 64-bit PTEs):
   9  *
  10  * - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4).
  11  *
  12  * - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the
  13  *   hardware PTEL value can't have the SH-bit set when MMUCR.IX is set,
  14  *   which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT).
  15  *
  16  *   In order to keep this relatively clean, do not use these for defining
  17  *   SH-3 specific flags until all of the other unused bits have been
  18  *   exhausted.
  19  *
  20  * - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE.
  21  *
  22  * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages.
  23  *   Bit 10 is used for _PAGE_ACCESSED, and bit 11 is used for _PAGE_SPECIAL.
  24  *
  25  * - On 29 bit platforms, bits 31 to 29 are used for the space attributes
  26  *   and timing control which (together with bit 0) are moved into the
  27  *   old-style PTEA on the parts that support it.
  28  *
  29  * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day.
  30  *
  31  * SH-X2 MMUs and extended PTEs
  32  *
  33  * SH-X2 supports an extended mode TLB with split data arrays due to the
  34  * number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and
  35  * SZ bit placeholders still exist in data array 1, but are implemented as
  36  * reserved bits, with the real logic existing in data array 2.
  37  *
  38  * The downside to this is that we can no longer fit everything in to a 32-bit
  39  * PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus
  40  * side, this gives us quite a few spare bits to play with for future usage.
  41  */
  42 /* Legacy and compat mode bits */
  43 #define _PAGE_WT        0x001           /* WT-bit on SH-4, 0 on SH-3 */
  44 #define _PAGE_HW_SHARED 0x002           /* SH-bit  : shared among processes */
  45 #define _PAGE_DIRTY     0x004           /* D-bit   : page changed */
  46 #define _PAGE_CACHABLE  0x008           /* C-bit   : cachable */
  47 #define _PAGE_SZ0       0x010           /* SZ0-bit : Size of page */
  48 #define _PAGE_RW        0x020           /* PR0-bit : write access allowed */
  49 #define _PAGE_USER      0x040           /* PR1-bit : user space access allowed*/
  50 #define _PAGE_SZ1       0x080           /* SZ1-bit : Size of page (on SH-4) */
  51 #define _PAGE_PRESENT   0x100           /* V-bit   : page is valid */
  52 #define _PAGE_PROTNONE  0x200           /* software: if not present  */
  53 #define _PAGE_ACCESSED  0x400           /* software: page referenced */
  54 #define _PAGE_FILE      _PAGE_WT        /* software: pagecache or swap? */
  55 #define _PAGE_SPECIAL   0x800           /* software: special page */
  56
  57 #define _PAGE_SZ_MASK   (_PAGE_SZ0 | _PAGE_SZ1)
  58 #define _PAGE_PR_MASK   (_PAGE_RW | _PAGE_USER)
  59
  60 /* Extended mode bits */
  61 #define _PAGE_EXT_ESZ0          0x0010  /* ESZ0-bit: Size of page */
  62 #define _PAGE_EXT_ESZ1          0x0020  /* ESZ1-bit: Size of page */
  63 #define _PAGE_EXT_ESZ2          0x0040  /* ESZ2-bit: Size of page */
  64 #define _PAGE_EXT_ESZ3          0x0080  /* ESZ3-bit: Size of page */
  65
  66 #define _PAGE_EXT_USER_EXEC     0x0100  /* EPR0-bit: User space executable */
  67 #define _PAGE_EXT_USER_WRITE    0x0200  /* EPR1-bit: User space writable */
  68 #define _PAGE_EXT_USER_READ     0x0400  /* EPR2-bit: User space readable */
  69
  70 #define _PAGE_EXT_KERN_EXEC     0x0800  /* EPR3-bit: Kernel space executable */
  71 #define _PAGE_EXT_KERN_WRITE    0x1000  /* EPR4-bit: Kernel space writable */
  72 #define _PAGE_EXT_KERN_READ     0x2000  /* EPR5-bit: Kernel space readable */
  73
  74 #define _PAGE_EXT_WIRED         0x4000  /* software: Wire TLB entry */
  75
  76 /* Wrapper for extended mode pgprot twiddling */
  77 #define _PAGE_EXT(x)            ((unsigned long long)(x) << 32)
  78
  79 /* software: moves to PTEA.TC (Timing Control) */
  80 #define _PAGE_PCC_AREA5 0x00000000      /* use BSC registers for area5 */
  81 #define _PAGE_PCC_AREA6 0x80000000      /* use BSC registers for area6 */
  82
  83 /* software: moves to PTEA.SA[2:0] (Space Attributes) */
  84 #define _PAGE_PCC_IODYN 0x00000001      /* IO space, dynamically sized bus */
  85 #define _PAGE_PCC_IO8   0x20000000      /* IO space, 8 bit bus */
  86 #define _PAGE_PCC_IO16  0x20000001      /* IO space, 16 bit bus */
  87 #define _PAGE_PCC_COM8  0x40000000      /* Common Memory space, 8 bit bus */
  88 #define _PAGE_PCC_COM16 0x40000001      /* Common Memory space, 16 bit bus */
  89 #define _PAGE_PCC_ATR8  0x60000000      /* Attribute Memory space, 8 bit bus */
  90 #define _PAGE_PCC_ATR16 0x60000001      /* Attribute Memory space, 6 bit bus */
  91
  92 #ifndef CONFIG_X2TLB
  93 /* copy the ptea attributes */
  94 static inline unsigned long copy_ptea_attributes(unsigned long x)
  95 {
  96         return  ((x >> 28) & 0xe) | (x & 0x1);
  97 }
  98 #endif
  99
 100 /* Mask which drops unused bits from the PTEL value */
 101 #if defined(CONFIG_CPU_SH3)
 102 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED| \
 103                                  _PAGE_FILE     | _PAGE_SZ1     | \
 104                                  _PAGE_HW_SHARED)
 105 #elif defined(CONFIG_X2TLB)
 106 /* Get rid of the legacy PR/SZ bits when using extended mode */
 107 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED | \
 108                                  _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK)
 109 #else
 110 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE)
 111 #endif
 112
 113 #define _PAGE_FLAGS_HARDWARE_MASK       (phys_addr_mask() & ~(_PAGE_CLEAR_FLAGS))
 114
 115 /* Hardware flags, page size encoding */
 116 #if !defined(CONFIG_MMU)
 117 # define _PAGE_FLAGS_HARD       0ULL
 118 #elif defined(CONFIG_X2TLB)
 119 # if defined(CONFIG_PAGE_SIZE_4KB)
 120 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ0)
 121 # elif defined(CONFIG_PAGE_SIZE_8KB)
 122 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ1)
 123 # elif defined(CONFIG_PAGE_SIZE_64KB)
 124 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ2)
 125 # endif
 126 #else
 127 # if defined(CONFIG_PAGE_SIZE_4KB)
 128 #  define _PAGE_FLAGS_HARD      _PAGE_SZ0
 129 # elif defined(CONFIG_PAGE_SIZE_64KB)
 130 #  define _PAGE_FLAGS_HARD      _PAGE_SZ1
 131 # endif
 132 #endif
 133
 134 #if defined(CONFIG_X2TLB)
 135 # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 136 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ2)
 137 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
 138 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2)
 139 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 140 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2)
 141 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
 142 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ3)
 143 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
 144 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3)
 145 # endif
 146 #else
 147 # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 148 #  define _PAGE_SZHUGE  (_PAGE_SZ1)
 149 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 150 #  define _PAGE_SZHUGE  (_PAGE_SZ0 | _PAGE_SZ1)
 151 # endif
 152 #endif
 153
 154 /*
 155  * Stub out _PAGE_SZHUGE if we don't have a good definition for it,
 156  * to make pte_mkhuge() happy.
 157  */
 158 #ifndef _PAGE_SZHUGE
 159 # define _PAGE_SZHUGE   (_PAGE_FLAGS_HARD)
 160 #endif
 161
 162 /*
 163  * Mask of bits that are to be preserved accross pgprot changes.
 164  */
 165 #define _PAGE_CHG_MASK \
 166         (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \
 167          _PAGE_DIRTY | _PAGE_SPECIAL)
 168
 169 #define _PAGE_WIRED     (_PAGE_EXT(_PAGE_EXT_WIRED))
 170
 171 #ifndef __ASSEMBLY__
 172
 173 #if defined(CONFIG_X2TLB) /* SH-X2 TLB */
 174 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
 175                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 176
 177 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 178                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 179                                  _PAGE_EXT(_PAGE_EXT_KERN_READ  | \
 180                                            _PAGE_EXT_KERN_WRITE | \
 181                                            _PAGE_EXT_USER_READ  | \
 182                                            _PAGE_EXT_USER_WRITE))
 183
 184 #define PAGE_EXECREAD   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 185                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 186                                  _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \
 187                                            _PAGE_EXT_KERN_READ | \
 188                                            _PAGE_EXT_USER_EXEC | \
 189                                            _PAGE_EXT_USER_READ))
 190
 191 #define PAGE_COPY       PAGE_EXECREAD
 192
 193 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 194                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 195                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 196                                            _PAGE_EXT_USER_READ))
 197
 198 #define PAGE_WRITEONLY  __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 199                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 200                                  _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
 201                                            _PAGE_EXT_USER_WRITE))
 202
 203 #define PAGE_RWX        __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 204                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 205                                  _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
 206                                            _PAGE_EXT_KERN_READ  | \
 207                                            _PAGE_EXT_KERN_EXEC  | \
 208                                            _PAGE_EXT_USER_WRITE | \
 209                                            _PAGE_EXT_USER_READ  | \
 210                                            _PAGE_EXT_USER_EXEC))
 211
 212 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 213                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 214                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
 215                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 216                                            _PAGE_EXT_KERN_WRITE | \
 217                                            _PAGE_EXT_KERN_EXEC))
 218
 219 #define PAGE_KERNEL_NOCACHE \
 220                         __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
 221                                  _PAGE_ACCESSED | _PAGE_HW_SHARED | \
 222                                  _PAGE_FLAGS_HARD | \
 223                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 224                                            _PAGE_EXT_KERN_WRITE | \
 225                                            _PAGE_EXT_KERN_EXEC))
 226
 227 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 228                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 229                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
 230                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 231                                            _PAGE_EXT_KERN_EXEC))
 232
 233 #define PAGE_KERNEL_PCC(slot, type) \
 234                         __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
 235                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
 236                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 237                                            _PAGE_EXT_KERN_WRITE | \
 238                                            _PAGE_EXT_KERN_EXEC) \
 239                                  (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
 240                                  (type))
 241
 242 #elif defined(CONFIG_MMU) /* SH-X TLB */
 243 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
 244                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 245
 246 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 247                                  _PAGE_CACHABLE | _PAGE_ACCESSED | \
 248                                  _PAGE_FLAGS_HARD)
 249
 250 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
 251                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 252
 253 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
 254                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 255
 256 #define PAGE_EXECREAD   PAGE_READONLY
 257 #define PAGE_RWX        PAGE_SHARED
 258 #define PAGE_WRITEONLY  PAGE_SHARED
 259
 260 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \
 261                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 262                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 263
 264 #define PAGE_KERNEL_NOCACHE \
 265                         __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
 266                                  _PAGE_ACCESSED | _PAGE_HW_SHARED | \
 267                                  _PAGE_FLAGS_HARD)
 268
 269 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 270                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 271                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 272
 273 #define PAGE_KERNEL_PCC(slot, type) \
 274                         __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
 275                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
 276                                  (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
 277                                  (type))
 278 #else /* no mmu */
 279 #define PAGE_NONE               __pgprot(0)
 280 #define PAGE_SHARED             __pgprot(0)
 281 #define PAGE_COPY               __pgprot(0)
 282 #define PAGE_EXECREAD           __pgprot(0)
 283 #define PAGE_RWX                __pgprot(0)
 284 #define PAGE_READONLY           __pgprot(0)
 285 #define PAGE_WRITEONLY          __pgprot(0)
 286 #define PAGE_KERNEL             __pgprot(0)
 287 #define PAGE_KERNEL_NOCACHE     __pgprot(0)
 288 #define PAGE_KERNEL_RO          __pgprot(0)
 289
 290 #define PAGE_KERNEL_PCC(slot, type) \
 291                                 __pgprot(0)
 292 #endif
 293
 294 #endif /* __ASSEMBLY__ */
 295
 296 #ifndef __ASSEMBLY__
 297
 298 /*
 299  * Certain architectures need to do special things when PTEs
 300  * within a page table are directly modified.  Thus, the following
 301  * hook is made available.
 302  */
 303 #ifdef CONFIG_X2TLB
 304 static inline void set_pte(pte_t *ptep, pte_t pte)
 305 {
 306         ptep->pte_high = pte.pte_high;
 307         smp_wmb();
 308         ptep->pte_low = pte.pte_low;
 309 }
 310 #else
 311 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
 312 #endif
 313
 314 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 315
 316 /*
 317  * (pmds are folded into pgds so this doesn't get actually called,
 318  * but the define is needed for a generic inline function.)
 319  */
 320 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
 321
 322 #define pfn_pte(pfn, prot) \
 323         __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 324 #define pfn_pmd(pfn, prot) \
 325         __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 326
 327 #define pte_none(x)             (!pte_val(x))
 328 #define pte_present(x)          ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
 329
 330 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 331
 332 #define pmd_none(x)     (!pmd_val(x))
 333 #define pmd_present(x)  (pmd_val(x))
 334 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 335 #define pmd_bad(x)      (pmd_val(x) & ~PAGE_MASK)
 336
 337 #define pages_to_mb(x)  ((x) >> (20-PAGE_SHIFT))
 338 #define pte_page(x)     pfn_to_page(pte_pfn(x))
 339
 340 /*
 341  * The following only work if pte_present() is true.
 342  * Undefined behaviour if not..
 343  */
 344 #define pte_not_present(pte)    (!((pte).pte_low & _PAGE_PRESENT))
 345 #define pte_dirty(pte)          ((pte).pte_low & _PAGE_DIRTY)
 346 #define pte_young(pte)          ((pte).pte_low & _PAGE_ACCESSED)
 347 #define pte_file(pte)           ((pte).pte_low & _PAGE_FILE)
 348 #define pte_special(pte)        ((pte).pte_low & _PAGE_SPECIAL)
 349
 350 #ifdef CONFIG_X2TLB
 351 #define pte_write(pte) \
 352         ((pte).pte_high & (_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE))
 353 #else
 354 #define pte_write(pte)          ((pte).pte_low & _PAGE_RW)
 355 #endif
 356
 357 #define PTE_BIT_FUNC(h,fn,op) \
 358 static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; }
 359
 360 #ifdef CONFIG_X2TLB
 361 /*
 362  * We cheat a bit in the SH-X2 TLB case. As the permission bits are
 363  * individually toggled (and user permissions are entirely decoupled from
 364  * kernel permissions), we attempt to couple them a bit more sanely here.
 365  */
 366 PTE_BIT_FUNC(high, wrprotect, &= ~(_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE));
 367 PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE);
 368 PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE);
 369 #else
 370 PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW);
 371 PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW);
 372 PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE);
 373 #endif
 374
 375 PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY);
 376 PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY);
 377 PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED);
 378 PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED);
 379 PTE_BIT_FUNC(low, mkspecial, |= _PAGE_SPECIAL);
 380
 381 #define __HAVE_ARCH_PTE_SPECIAL
 382
 383 /*
 384  * Macro and implementation to make a page protection as uncachable.
 385  */
 386 #define pgprot_writecombine(prot) \
 387         __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
 388
 389 #define pgprot_noncached         pgprot_writecombine
 390
 391 /*
 392  * Conversion functions: convert a page and protection to a page entry,
 393  * and a page entry and page directory to the page they refer to.
 394  *
 395  * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 396  */
 397 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 398
 399 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 400 {
 401         pte.pte_low &= _PAGE_CHG_MASK;
 402         pte.pte_low |= pgprot_val(newprot);
 403
 404 #ifdef CONFIG_X2TLB
 405         pte.pte_high |= pgprot_val(newprot) >> 32;
 406 #endif
 407
 408         return pte;
 409 }
 410
 411 #define pmd_page_vaddr(pmd)     ((unsigned long)pmd_val(pmd))
 412 #define pmd_page(pmd)           (virt_to_page(pmd_val(pmd)))
 413
 414 /* to find an entry in a page-table-directory. */
 415 #define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 416 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 417 #define __pgd_offset(address)   pgd_index(address)
 418
 419 /* to find an entry in a kernel page-table-directory */
 420 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 421
 422 #define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 423 #define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 424
 425 /* Find an entry in the third-level page table.. */
 426 #define pte_index(address)      ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 427 #define __pte_offset(address)   pte_index(address)
 428
 429 #define pte_offset_kernel(dir, address) \
 430         ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
 431 #define pte_offset_map(dir, address)            pte_offset_kernel(dir, address)
 432 #define pte_offset_map_nested(dir, address)     pte_offset_kernel(dir, address)
 433
 434 #define pte_unmap(pte)          do { } while (0)
 435 #define pte_unmap_nested(pte)   do { } while (0)
 436
 437 #ifdef CONFIG_X2TLB
 438 #define pte_ERROR(e) \
 439         printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \
 440                &(e), (e).pte_high, (e).pte_low)
 441 #define pgd_ERROR(e) \
 442         printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e))
 443 #else
 444 #define pte_ERROR(e) \
 445         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 446 #define pgd_ERROR(e) \
 447         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 448 #endif
 449
 450 /*
 451  * Encode and de-code a swap entry
 452  *
 453  * Constraints:
 454  *      _PAGE_FILE at bit 0
 455  *      _PAGE_PRESENT at bit 8
 456  *      _PAGE_PROTNONE at bit 9
 457  *
 458  * For the normal case, we encode the swap type into bits 0:7 and the
 459  * swap offset into bits 10:30. For the 64-bit PTE case, we keep the
 460  * preserved bits in the low 32-bits and use the upper 32 as the swap
 461  * offset (along with a 5-bit type), following the same approach as x86
 462  * PAE. This keeps the logic quite simple, and allows for a full 32
 463  * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with
 464  * in the pte_low case.
 465  *
 466  * As is evident by the Alpha code, if we ever get a 64-bit unsigned
 467  * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes
 468  * much cleaner..
 469  *
 470  * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
 471  *       and _PAGE_PROTNONE bits
 472  */
 473 #ifdef CONFIG_X2TLB
 474 #define __swp_type(x)                   ((x).val & 0x1f)
 475 #define __swp_offset(x)                 ((x).val >> 5)
 476 #define __swp_entry(type, offset)       ((swp_entry_t){ (type) | (offset) << 5})
 477 #define __pte_to_swp_entry(pte)         ((swp_entry_t){ (pte).pte_high })
 478 #define __swp_entry_to_pte(x)           ((pte_t){ 0, (x).val })
 479
 480 /*
 481  * Encode and decode a nonlinear file mapping entry
 482  */
 483 #define pte_to_pgoff(pte)               ((pte).pte_high)
 484 #define pgoff_to_pte(off)               ((pte_t) { _PAGE_FILE, (off) })
 485
 486 #define PTE_FILE_MAX_BITS               32
 487 #else
 488 #define __swp_type(x)                   ((x).val & 0xff)
 489 #define __swp_offset(x)                 ((x).val >> 10)
 490 #define __swp_entry(type, offset)       ((swp_entry_t){(type) | (offset) <<10})
 491
 492 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) >> 1 })
 493 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val << 1 })
 494
 495 /*
 496  * Encode and decode a nonlinear file mapping entry
 497  */
 498 #define PTE_FILE_MAX_BITS       29
 499 #define pte_to_pgoff(pte)       (pte_val(pte) >> 1)
 500 #define pgoff_to_pte(off)       ((pte_t) { ((off) << 1) | _PAGE_FILE })
 501 #endif
 502
 503 #endif /* __ASSEMBLY__ */
 504 #endif /* __ASM_SH_PGTABLE_32_H */