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