release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/include/asm/pgtable_32.h

   1 #ifndef __ASM_SH_PGTABLE_32_H
   2 #define __ASM_SH_PGTABLE_32_H
   3
   4 /* Legacy and compat mode bits */
   5 #define _PAGE_WT        0x001           /* WT-bit on SH-4, 0 on SH-3 */
   6 #define _PAGE_HW_SHARED 0x002           /* SH-bit  : shared among processes */
   7 #define _PAGE_DIRTY     0x004           /* D-bit   : page changed */
   8 #define _PAGE_CACHABLE  0x008           /* C-bit   : cachable */
   9 #define _PAGE_SZ0       0x010           /* SZ0-bit : Size of page */
  10 #define _PAGE_RW        0x020
  11 #define _PAGE_USER      0x040
  12 #define _PAGE_SZ1       0x080           /* SZ1-bit : Size of page (on SH-4) */
  13 #define _PAGE_PRESENT   0x100           /* V-bit   : page is valid */
  14 #define _PAGE_PROTNONE  0x200           /* software: if not present  */
  15 #define _PAGE_ACCESSED  0x400           /* software: page referenced */
  16 #define _PAGE_FILE      _PAGE_WT        /* software: pagecache or swap? */
  17 #define _PAGE_SPECIAL   0x800           /* software: special page */
  18
  19 #define _PAGE_SZ_MASK   (_PAGE_SZ0 | _PAGE_SZ1)
  20 #define _PAGE_PR_MASK   (_PAGE_RW | _PAGE_USER)
  21
  22 /* Extended mode bits */
  23 #define _PAGE_EXT_ESZ0          0x0010  /* ESZ0-bit: Size of page */
  24 #define _PAGE_EXT_ESZ1          0x0020  /* ESZ1-bit: Size of page */
  25 #define _PAGE_EXT_ESZ2          0x0040  /* ESZ2-bit: Size of page */
  26 #define _PAGE_EXT_ESZ3          0x0080  /* ESZ3-bit: Size of page */
  27
  28 #define _PAGE_EXT_USER_EXEC     0x0100  /* EPR0-bit: User space executable */
  29 #define _PAGE_EXT_USER_WRITE    0x0200  /* EPR1-bit: User space writable */
  30 #define _PAGE_EXT_USER_READ     0x0400  /* EPR2-bit: User space readable */
  31
  32 #define _PAGE_EXT_KERN_EXEC     0x0800  /* EPR3-bit: Kernel space executable */
  33 #define _PAGE_EXT_KERN_WRITE    0x1000  /* EPR4-bit: Kernel space writable */
  34 #define _PAGE_EXT_KERN_READ     0x2000  /* EPR5-bit: Kernel space readable */
  35
  36 #define _PAGE_EXT_WIRED         0x4000  /* software: Wire TLB entry */
  37
  38 /* Wrapper for extended mode pgprot twiddling */
  39 #define _PAGE_EXT(x)            ((unsigned long long)(x) << 32)
  40
  41 #ifdef CONFIG_X2TLB
  42 #define _PAGE_PCC_MASK  0x00000000      /* No legacy PTEA support */
  43 #else
  44
  45 /* software: moves to PTEA.TC (Timing Control) */
  46 #define _PAGE_PCC_AREA5 0x00000000      /* use BSC registers for area5 */
  47 #define _PAGE_PCC_AREA6 0x80000000      /* use BSC registers for area6 */
  48
  49 /* software: moves to PTEA.SA[2:0] (Space Attributes) */
  50 #define _PAGE_PCC_IODYN 0x00000001      /* IO space, dynamically sized bus */
  51 #define _PAGE_PCC_IO8   0x20000000      /* IO space, 8 bit bus */
  52 #define _PAGE_PCC_IO16  0x20000001      /* IO space, 16 bit bus */
  53 #define _PAGE_PCC_COM8  0x40000000      /* Common Memory space, 8 bit bus */
  54 #define _PAGE_PCC_COM16 0x40000001      /* Common Memory space, 16 bit bus */
  55 #define _PAGE_PCC_ATR8  0x60000000      /* Attribute Memory space, 8 bit bus */
  56 #define _PAGE_PCC_ATR16 0x60000001      /* Attribute Memory space, 6 bit bus */
  57
  58 #define _PAGE_PCC_MASK  0xe0000001
  59
  60 /* copy the ptea attributes */
  61 static inline unsigned long copy_ptea_attributes(unsigned long x)
  62 {
  63         return  ((x >> 28) & 0xe) | (x & 0x1);
  64 }
  65 #endif
  66
  67 /* Mask which drops unused bits from the PTEL value */
  68 #if defined(CONFIG_CPU_SH3)
  69 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED| \
  70                                  _PAGE_FILE     | _PAGE_SZ1     | \
  71                                  _PAGE_HW_SHARED)
  72 #elif defined(CONFIG_X2TLB)
  73 /* Get rid of the legacy PR/SZ bits when using extended mode */
  74 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED | \
  75                                  _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK)
  76 #else
  77 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE)
  78 #endif
  79
  80 #define _PAGE_FLAGS_HARDWARE_MASK       (phys_addr_mask() & ~(_PAGE_CLEAR_FLAGS))
  81
  82 /* Hardware flags, page size encoding */
  83 #if !defined(CONFIG_MMU)
  84 # define _PAGE_FLAGS_HARD       0ULL
  85 #elif defined(CONFIG_X2TLB)
  86 # if defined(CONFIG_PAGE_SIZE_4KB)
  87 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ0)
  88 # elif defined(CONFIG_PAGE_SIZE_8KB)
  89 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ1)
  90 # elif defined(CONFIG_PAGE_SIZE_64KB)
  91 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ2)
  92 # endif
  93 #else
  94 # if defined(CONFIG_PAGE_SIZE_4KB)
  95 #  define _PAGE_FLAGS_HARD      _PAGE_SZ0
  96 # elif defined(CONFIG_PAGE_SIZE_64KB)
  97 #  define _PAGE_FLAGS_HARD      _PAGE_SZ1
  98 # endif
  99 #endif
 100
 101 #if defined(CONFIG_X2TLB)
 102 # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 103 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ2)
 104 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
 105 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2)
 106 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 107 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2)
 108 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
 109 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ3)
 110 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
 111 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3)
 112 # endif
 113 # define _PAGE_WIRED    (_PAGE_EXT(_PAGE_EXT_WIRED))
 114 #else
 115 # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 116 #  define _PAGE_SZHUGE  (_PAGE_SZ1)
 117 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 118 #  define _PAGE_SZHUGE  (_PAGE_SZ0 | _PAGE_SZ1)
 119 # endif
 120 # define _PAGE_WIRED    (0)
 121 #endif
 122
 123 /*
 124  * Stub out _PAGE_SZHUGE if we don't have a good definition for it,
 125  * to make pte_mkhuge() happy.
 126  */
 127 #ifndef _PAGE_SZHUGE
 128 # define _PAGE_SZHUGE   (_PAGE_FLAGS_HARD)
 129 #endif
 130
 131 /*
 132  * Mask of bits that are to be preserved accross pgprot changes.
 133  */
 134 #define _PAGE_CHG_MASK \
 135         (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \
 136          _PAGE_DIRTY | _PAGE_SPECIAL)
 137
 138 #ifndef __ASSEMBLY__
 139
 140 #if defined(CONFIG_X2TLB)     /* SH-X2 TLB */
 141 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
 142                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 143
 144 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 145                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 146                                  _PAGE_EXT(_PAGE_EXT_KERN_READ  | \
 147                                            _PAGE_EXT_KERN_WRITE | \
 148                                            _PAGE_EXT_USER_READ  | \
 149                                            _PAGE_EXT_USER_WRITE))
 150
 151 #define PAGE_EXECREAD   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 152                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 153                                  _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \
 154                                            _PAGE_EXT_KERN_READ | \
 155                                            _PAGE_EXT_USER_EXEC | \
 156                                            _PAGE_EXT_USER_READ))
 157
 158 #define PAGE_COPY       PAGE_EXECREAD
 159
 160 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 161                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 162                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 163                                            _PAGE_EXT_USER_READ))
 164
 165 #define PAGE_WRITEONLY  __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 166                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 167                                  _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
 168                                            _PAGE_EXT_USER_WRITE))
 169
 170 #define PAGE_RWX        __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 171                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 172                                  _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
 173                                            _PAGE_EXT_KERN_READ  | \
 174                                            _PAGE_EXT_KERN_EXEC  | \
 175                                            _PAGE_EXT_USER_WRITE | \
 176                                            _PAGE_EXT_USER_READ  | \
 177                                            _PAGE_EXT_USER_EXEC))
 178
 179 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 180                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 181                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
 182                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 183                                            _PAGE_EXT_KERN_WRITE | \
 184                                            _PAGE_EXT_KERN_EXEC))
 185
 186 #define PAGE_KERNEL_NOCACHE \
 187                         __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
 188                                  _PAGE_ACCESSED | _PAGE_HW_SHARED | \
 189                                  _PAGE_FLAGS_HARD | \
 190                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 191                                            _PAGE_EXT_KERN_WRITE | \
 192                                            _PAGE_EXT_KERN_EXEC))
 193
 194 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 195                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 196                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
 197                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 198                                            _PAGE_EXT_KERN_EXEC))
 199
 200 #define PAGE_KERNEL_PCC(slot, type) \
 201                         __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
 202                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
 203                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 204                                            _PAGE_EXT_KERN_WRITE | \
 205                                            _PAGE_EXT_KERN_EXEC) \
 206                                  (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
 207                                  (type))
 208
 209 #elif defined(CONFIG_MMU)   /* SH-X TLB */
 210 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
 211                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 212
 213 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 214                                  _PAGE_CACHABLE | _PAGE_ACCESSED | \
 215                                  _PAGE_FLAGS_HARD)
 216
 217 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
 218                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 219
 220 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
 221                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 222
 223 #define PAGE_EXECREAD   PAGE_READONLY
 224 #define PAGE_RWX        PAGE_SHARED
 225 #define PAGE_WRITEONLY  PAGE_SHARED
 226
 227 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \
 228                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 229                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 230
 231 #define PAGE_KERNEL_NOCACHE \
 232                         __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
 233                                  _PAGE_ACCESSED | _PAGE_HW_SHARED | \
 234                                  _PAGE_FLAGS_HARD)
 235
 236 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 237                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 238                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 239
 240 #define PAGE_KERNEL_PCC(slot, type) \
 241                         __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
 242                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
 243                                  (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
 244                                  (type))
 245 #else /* no mmu */
 246 #define PAGE_NONE               __pgprot(0)
 247 #define PAGE_SHARED             __pgprot(0)
 248 #define PAGE_COPY               __pgprot(0)
 249 #define PAGE_EXECREAD           __pgprot(0)
 250 #define PAGE_RWX                __pgprot(0)
 251 #define PAGE_READONLY           __pgprot(0)
 252 #define PAGE_WRITEONLY          __pgprot(0)
 253 #define PAGE_KERNEL             __pgprot(0)
 254 #define PAGE_KERNEL_NOCACHE     __pgprot(0)
 255 #define PAGE_KERNEL_RO          __pgprot(0)
 256
 257 #define PAGE_KERNEL_PCC(slot, type) \
 258                                 __pgprot(0)
 259 #endif
 260
 261 #endif /* __ASSEMBLY__ */
 262
 263 #ifndef __ASSEMBLY__
 264
 265 /*
 266  * Certain architectures need to do special things when PTEs
 267  * within a page table are directly modified.  Thus, the following
 268  * hook is made available.
 269  */
 270 #ifdef CONFIG_X2TLB
 271 static inline void set_pte(pte_t *ptep, pte_t pte)
 272 {
 273         ptep->pte_high = pte.pte_high;
 274         smp_wmb();
 275         ptep->pte_low = pte.pte_low;
 276 }
 277 #else
 278 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
 279 #endif
 280
 281 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 282
 283 /*
 284  * (pmds are folded into pgds so this doesn't get actually called,
 285  * but the define is needed for a generic inline function.)
 286  */
 287 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
 288
 289 #define pfn_pte(pfn, prot) \
 290         __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 291 #define pfn_pmd(pfn, prot) \
 292         __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 293
 294 #define pte_none(x)             (!pte_val(x))
 295 #define pte_present(x)          ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
 296
 297 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 298
 299 #define pmd_none(x)     (!pmd_val(x))
 300 #define pmd_present(x)  (pmd_val(x))
 301 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 302 #define pmd_bad(x)      (pmd_val(x) & ~PAGE_MASK)
 303
 304 #define pages_to_mb(x)  ((x) >> (20-PAGE_SHIFT))
 305 #define pte_page(x)     pfn_to_page(pte_pfn(x))
 306
 307 /*
 308  * The following only work if pte_present() is true.
 309  * Undefined behaviour if not..
 310  */
 311 #define pte_not_present(pte)    (!((pte).pte_low & _PAGE_PRESENT))
 312 #define pte_dirty(pte)          ((pte).pte_low & _PAGE_DIRTY)
 313 #define pte_young(pte)          ((pte).pte_low & _PAGE_ACCESSED)
 314 #define pte_file(pte)           ((pte).pte_low & _PAGE_FILE)
 315 #define pte_special(pte)        ((pte).pte_low & _PAGE_SPECIAL)
 316
 317 #ifdef CONFIG_X2TLB
 318 #define pte_write(pte) \
 319         ((pte).pte_high & (_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE))
 320 #else
 321 #define pte_write(pte)          ((pte).pte_low & _PAGE_RW)
 322 #endif
 323
 324 #define PTE_BIT_FUNC(h,fn,op) \
 325 static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; }
 326
 327 #ifdef CONFIG_X2TLB
 328 /*
 329  * We cheat a bit in the SH-X2 TLB case. As the permission bits are
 330  * individually toggled (and user permissions are entirely decoupled from
 331  * kernel permissions), we attempt to couple them a bit more sanely here.
 332  */
 333 PTE_BIT_FUNC(high, wrprotect, &= ~(_PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE));
 334 PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE);
 335 PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE);
 336 #else
 337 PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW);
 338 PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW);
 339 PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE);
 340 #endif
 341
 342 PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY);
 343 PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY);
 344 PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED);
 345 PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED);
 346 PTE_BIT_FUNC(low, mkspecial, |= _PAGE_SPECIAL);
 347
 348 #define __HAVE_ARCH_PTE_SPECIAL
 349
 350 /*
 351  * Macro and implementation to make a page protection as uncachable.
 352  */
 353 #define pgprot_writecombine(prot) \
 354         __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
 355
 356 #define pgprot_noncached         pgprot_writecombine
 357
 358 /*
 359  * Conversion functions: convert a page and protection to a page entry,
 360  * and a page entry and page directory to the page they refer to.
 361  *
 362  * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 363  */
 364 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 365
 366 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 367 {
 368         pte.pte_low &= _PAGE_CHG_MASK;
 369         pte.pte_low |= pgprot_val(newprot);
 370
 371 #ifdef CONFIG_X2TLB
 372         pte.pte_high |= pgprot_val(newprot) >> 32;
 373 #endif
 374
 375         return pte;
 376 }
 377
 378 #define pmd_page_vaddr(pmd)     ((unsigned long)pmd_val(pmd))
 379 #define pmd_page(pmd)           (virt_to_page(pmd_val(pmd)))
 380
 381 /* to find an entry in a page-table-directory. */
 382 #define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 383 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 384 #define __pgd_offset(address)   pgd_index(address)
 385
 386 /* to find an entry in a kernel page-table-directory */
 387 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 388
 389 #define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 390 #define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 391
 392 /* Find an entry in the third-level page table.. */
 393 #define pte_index(address)      ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 394 #define __pte_offset(address)   pte_index(address)
 395
 396 #define pte_offset_kernel(dir, address) \
 397         ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
 398 #define pte_offset_map(dir, address)            pte_offset_kernel(dir, address)
 399 #define pte_offset_map_nested(dir, address)     pte_offset_kernel(dir, address)
 400
 401 #define pte_unmap(pte)          do { } while (0)
 402 #define pte_unmap_nested(pte)   do { } while (0)
 403
 404 #ifdef CONFIG_X2TLB
 405 #define pte_ERROR(e) \
 406         printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \
 407                &(e), (e).pte_high, (e).pte_low)
 408 #define pgd_ERROR(e) \
 409         printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e))
 410 #else
 411 #define pte_ERROR(e) \
 412         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 413 #define pgd_ERROR(e) \
 414         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 415 #endif
 416
 417 /*
 418  * Encode and de-code a swap entry
 419  *
 420  * Constraints:
 421  *      _PAGE_FILE at bit 0
 422  *      _PAGE_PRESENT at bit 8
 423  *      _PAGE_PROTNONE at bit 9
 424  *
 425  * For the normal case, we encode the swap type into bits 0:7 and the
 426  * swap offset into bits 10:30. For the 64-bit PTE case, we keep the
 427  * preserved bits in the low 32-bits and use the upper 32 as the swap
 428  * offset (along with a 5-bit type), following the same approach as x86
 429  * PAE. This keeps the logic quite simple, and allows for a full 32
 430  * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with
 431  * in the pte_low case.
 432  *
 433  * As is evident by the Alpha code, if we ever get a 64-bit unsigned
 434  * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes
 435  * much cleaner..
 436  *
 437  * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
 438  *       and _PAGE_PROTNONE bits
 439  */
 440 #ifdef CONFIG_X2TLB
 441 #define __swp_type(x)                   ((x).val & 0x1f)
 442 #define __swp_offset(x)                 ((x).val >> 5)
 443 #define __swp_entry(type, offset)       ((swp_entry_t){ (type) | (offset) << 5})
 444 #define __pte_to_swp_entry(pte)         ((swp_entry_t){ (pte).pte_high })
 445 #define __swp_entry_to_pte(x)           ((pte_t){ 0, (x).val })
 446
 447 /*
 448  * Encode and decode a nonlinear file mapping entry
 449  */
 450 #define pte_to_pgoff(pte)               ((pte).pte_high)
 451 #define pgoff_to_pte(off)               ((pte_t) { _PAGE_FILE, (off) })
 452
 453 #define PTE_FILE_MAX_BITS               32
 454 #else
 455 #define __swp_type(x)                   ((x).val & 0xff)
 456 #define __swp_offset(x)                 ((x).val >> 10)
 457 #define __swp_entry(type, offset)       ((swp_entry_t){(type) | (offset) <<10})
 458
 459 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) >> 1 })
 460 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val << 1 })
 461
 462 /*
 463  * Encode and decode a nonlinear file mapping entry
 464  */
 465 #define PTE_FILE_MAX_BITS       29
 466 #define pte_to_pgoff(pte)       (pte_val(pte) >> 1)
 467 #define pgoff_to_pte(off)       ((pte_t) { ((off) << 1) | _PAGE_FILE })
 468 #endif
 469
 470 #endif /* __ASSEMBLY__ */
 471 #endif /* __ASM_SH_PGTABLE_32_H */