include/asm-sh/pgtable.h

   1 /*
   2  * This file contains the functions and defines necessary to modify and
   3  * use the SuperH page table tree.
   4  *
   5  * Copyright (C) 1999 Niibe Yutaka
   6  * Copyright (C) 2002 - 2005 Paul Mundt
   7  *
   8  * This file is subject to the terms and conditions of the GNU General
   9  * Public License.  See the file "COPYING" in the main directory of this
  10  * archive for more details.
  11  */
  12 #ifndef __ASM_SH_PGTABLE_H
  13 #define __ASM_SH_PGTABLE_H
  14
  15 #include <asm-generic/pgtable-nopmd.h>
  16 #include <asm/page.h>
  17
  18 #ifndef __ASSEMBLY__
  19 #include <asm/addrspace.h>
  20 #include <asm/fixmap.h>
  21
  22 /*
  23  * ZERO_PAGE is a global shared page that is always zero: used
  24  * for zero-mapped memory areas etc..
  25  */
  26 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  27 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  28
  29 #endif /* !__ASSEMBLY__ */
  30
  31 /*
  32  * traditional two-level paging structure
  33  */
  34 /* PTE bits */
  35 #ifdef CONFIG_X2TLB
  36 # define PTE_MAGNITUDE  3       /* 64-bit PTEs on extended mode SH-X2 TLB */
  37 #else
  38 # define PTE_MAGNITUDE  2       /* 32-bit PTEs */
  39 #endif
  40 #define PTE_SHIFT       PAGE_SHIFT
  41 #define PTE_BITS        (PTE_SHIFT - PTE_MAGNITUDE)
  42
  43 /* PGD bits */
  44 #define PGDIR_SHIFT     (PTE_SHIFT + PTE_BITS)
  45 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  46 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  47
  48 /* Entries per level */
  49 #define PTRS_PER_PTE    (PAGE_SIZE / (1 << PTE_MAGNITUDE))
  50 #define PTRS_PER_PGD    (PAGE_SIZE / sizeof(pgd_t))
  51
  52 #define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)
  53 #define FIRST_USER_ADDRESS      0
  54
  55 #define PTE_PHYS_MASK           (0x20000000 - PAGE_SIZE)
  56
  57 #define VMALLOC_START   (P3SEG)
  58 #define VMALLOC_END     (FIXADDR_START-2*PAGE_SIZE)
  59
  60 /*
  61  * Linux PTEL encoding.
  62  *
  63  * Hardware and software bit definitions for the PTEL value (see below for
  64  * notes on SH-X2 MMUs and 64-bit PTEs):
  65  *
  66  * - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4).
  67  *
  68  * - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the
  69  *   hardware PTEL value can't have the SH-bit set when MMUCR.IX is set,
  70  *   which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT).
  71  *
  72  *   In order to keep this relatively clean, do not use these for defining
  73  *   SH-3 specific flags until all of the other unused bits have been
  74  *   exhausted.
  75  *
  76  * - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE.
  77  *
  78  * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages.
  79  *   Bit 10 is used for _PAGE_ACCESSED, bit 11 remains unused.
  80  *
  81  * - Bits 31, 30, and 29 remain unused by everyone and can be used for future
  82  *   software flags, although care must be taken to update _PAGE_CLEAR_FLAGS.
  83  *
  84  * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day.
  85  *
  86  * SH-X2 MMUs and extended PTEs
  87  *
  88  * SH-X2 supports an extended mode TLB with split data arrays due to the
  89  * number of bits needed for PR and SZ (now EPR and ESZ) encodings. The PR and
  90  * SZ bit placeholders still exist in data array 1, but are implemented as
  91  * reserved bits, with the real logic existing in data array 2.
  92  *
  93  * The downside to this is that we can no longer fit everything in to a 32-bit
  94  * PTE encoding, so a 64-bit pte_t is necessary for these parts. On the plus
  95  * side, this gives us quite a few spare bits to play with for future usage.
  96  */
  97 /* Legacy and compat mode bits */
  98 #define _PAGE_WT        0x001           /* WT-bit on SH-4, 0 on SH-3 */
  99 #define _PAGE_HW_SHARED 0x002           /* SH-bit  : shared among processes */
 100 #define _PAGE_DIRTY     0x004           /* D-bit   : page changed */
 101 #define _PAGE_CACHABLE  0x008           /* C-bit   : cachable */
 102 #define _PAGE_SZ0       0x010           /* SZ0-bit : Size of page */
 103 #define _PAGE_RW        0x020           /* PR0-bit : write access allowed */
 104 #define _PAGE_USER      0x040           /* PR1-bit : user space access allowed*/
 105 #define _PAGE_SZ1       0x080           /* SZ1-bit : Size of page (on SH-4) */
 106 #define _PAGE_PRESENT   0x100           /* V-bit   : page is valid */
 107 #define _PAGE_PROTNONE  0x200           /* software: if not present  */
 108 #define _PAGE_ACCESSED  0x400           /* software: page referenced */
 109 #define _PAGE_FILE      _PAGE_WT        /* software: pagecache or swap? */
 110
 111 #define _PAGE_SZ_MASK   (_PAGE_SZ0 | _PAGE_SZ1)
 112 #define _PAGE_PR_MASK   (_PAGE_RW | _PAGE_USER)
 113
 114 /* Extended mode bits */
 115 #define _PAGE_EXT_ESZ0          0x0010  /* ESZ0-bit: Size of page */
 116 #define _PAGE_EXT_ESZ1          0x0020  /* ESZ1-bit: Size of page */
 117 #define _PAGE_EXT_ESZ2          0x0040  /* ESZ2-bit: Size of page */
 118 #define _PAGE_EXT_ESZ3          0x0080  /* ESZ3-bit: Size of page */
 119
 120 #define _PAGE_EXT_USER_EXEC     0x0100  /* EPR0-bit: User space executable */
 121 #define _PAGE_EXT_USER_WRITE    0x0200  /* EPR1-bit: User space writable */
 122 #define _PAGE_EXT_USER_READ     0x0400  /* EPR2-bit: User space readable */
 123
 124 #define _PAGE_EXT_KERN_EXEC     0x0800  /* EPR3-bit: Kernel space executable */
 125 #define _PAGE_EXT_KERN_WRITE    0x1000  /* EPR4-bit: Kernel space writable */
 126 #define _PAGE_EXT_KERN_READ     0x2000  /* EPR5-bit: Kernel space readable */
 127
 128 /* Wrapper for extended mode pgprot twiddling */
 129 #define _PAGE_EXT(x)            ((unsigned long long)(x) << 32)
 130
 131 /* software: moves to PTEA.TC (Timing Control) */
 132 #define _PAGE_PCC_AREA5 0x00000000      /* use BSC registers for area5 */
 133 #define _PAGE_PCC_AREA6 0x80000000      /* use BSC registers for area6 */
 134
 135 /* software: moves to PTEA.SA[2:0] (Space Attributes) */
 136 #define _PAGE_PCC_IODYN 0x00000001      /* IO space, dynamically sized bus */
 137 #define _PAGE_PCC_IO8   0x20000000      /* IO space, 8 bit bus */
 138 #define _PAGE_PCC_IO16  0x20000001      /* IO space, 16 bit bus */
 139 #define _PAGE_PCC_COM8  0x40000000      /* Common Memory space, 8 bit bus */
 140 #define _PAGE_PCC_COM16 0x40000001      /* Common Memory space, 16 bit bus */
 141 #define _PAGE_PCC_ATR8  0x60000000      /* Attribute Memory space, 8 bit bus */
 142 #define _PAGE_PCC_ATR16 0x60000001      /* Attribute Memory space, 6 bit bus */
 143
 144 /* Mask which drops unused bits from the PTEL value */
 145 #if defined(CONFIG_CPU_SH3)
 146 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED| \
 147                                  _PAGE_FILE     | _PAGE_SZ1     | \
 148                                  _PAGE_HW_SHARED)
 149 #elif defined(CONFIG_X2TLB)
 150 /* Get rid of the legacy PR/SZ bits when using extended mode */
 151 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED | \
 152                                  _PAGE_FILE | _PAGE_PR_MASK | _PAGE_SZ_MASK)
 153 #else
 154 #define _PAGE_CLEAR_FLAGS       (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE)
 155 #endif
 156
 157 #define _PAGE_FLAGS_HARDWARE_MASK       (0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
 158
 159 /* Hardware flags, page size encoding */
 160 #if defined(CONFIG_X2TLB)
 161 # if defined(CONFIG_PAGE_SIZE_4KB)
 162 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ0)
 163 # elif defined(CONFIG_PAGE_SIZE_8KB)
 164 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ1)
 165 # elif defined(CONFIG_PAGE_SIZE_64KB)
 166 #  define _PAGE_FLAGS_HARD      _PAGE_EXT(_PAGE_EXT_ESZ2)
 167 # endif
 168 #else
 169 # if defined(CONFIG_PAGE_SIZE_4KB)
 170 #  define _PAGE_FLAGS_HARD      _PAGE_SZ0
 171 # elif defined(CONFIG_PAGE_SIZE_64KB)
 172 #  define _PAGE_FLAGS_HARD      _PAGE_SZ1
 173 # endif
 174 #endif
 175
 176 #if defined(CONFIG_X2TLB)
 177 # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 178 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ2)
 179 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
 180 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ2)
 181 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 182 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ0 | _PAGE_EXT_ESZ1 | _PAGE_EXT_ESZ2)
 183 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
 184 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ3)
 185 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
 186 #  define _PAGE_SZHUGE  (_PAGE_EXT_ESZ2 | _PAGE_EXT_ESZ3)
 187 # endif
 188 #else
 189 # if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 190 #  define _PAGE_SZHUGE  (_PAGE_SZ1)
 191 # elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 192 #  define _PAGE_SZHUGE  (_PAGE_SZ0 | _PAGE_SZ1)
 193 # endif
 194 #endif
 195
 196 /*
 197  * Stub out _PAGE_SZHUGE if we don't have a good definition for it,
 198  * to make pte_mkhuge() happy.
 199  */
 200 #ifndef _PAGE_SZHUGE
 201 # define _PAGE_SZHUGE   (_PAGE_FLAGS_HARD)
 202 #endif
 203
 204 #define _PAGE_CHG_MASK \
 205         (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY)
 206
 207 #ifndef __ASSEMBLY__
 208
 209 #if defined(CONFIG_X2TLB) /* SH-X2 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_ACCESSED | \
 214                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 215                                  _PAGE_EXT(_PAGE_EXT_KERN_READ  | \
 216                                            _PAGE_EXT_KERN_WRITE | \
 217                                            _PAGE_EXT_USER_READ  | \
 218                                            _PAGE_EXT_USER_WRITE))
 219
 220 #define PAGE_EXECREAD   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 221                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 222                                  _PAGE_EXT(_PAGE_EXT_KERN_EXEC | \
 223                                            _PAGE_EXT_KERN_READ | \
 224                                            _PAGE_EXT_USER_EXEC | \
 225                                            _PAGE_EXT_USER_READ))
 226
 227 #define PAGE_COPY       PAGE_EXECREAD
 228
 229 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 230                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 231                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 232                                            _PAGE_EXT_USER_READ))
 233
 234 #define PAGE_WRITEONLY  __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 235                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 236                                  _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
 237                                            _PAGE_EXT_USER_WRITE))
 238
 239 #define PAGE_RWX        __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 240                                  _PAGE_CACHABLE | _PAGE_FLAGS_HARD | \
 241                                  _PAGE_EXT(_PAGE_EXT_KERN_WRITE | \
 242                                            _PAGE_EXT_KERN_READ  | \
 243                                            _PAGE_EXT_KERN_EXEC  | \
 244                                            _PAGE_EXT_USER_WRITE | \
 245                                            _PAGE_EXT_USER_READ  | \
 246                                            _PAGE_EXT_USER_EXEC))
 247
 248 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 249                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 250                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
 251                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 252                                            _PAGE_EXT_KERN_WRITE | \
 253                                            _PAGE_EXT_KERN_EXEC))
 254
 255 #define PAGE_KERNEL_NOCACHE \
 256                         __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
 257                                  _PAGE_ACCESSED | _PAGE_HW_SHARED | \
 258                                  _PAGE_FLAGS_HARD | \
 259                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 260                                            _PAGE_EXT_KERN_WRITE | \
 261                                            _PAGE_EXT_KERN_EXEC))
 262
 263 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 264                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 265                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | \
 266                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 267                                            _PAGE_EXT_KERN_EXEC))
 268
 269 #define PAGE_KERNEL_PCC(slot, type) \
 270                         __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | \
 271                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
 272                                  _PAGE_EXT(_PAGE_EXT_KERN_READ | \
 273                                            _PAGE_EXT_KERN_WRITE | \
 274                                            _PAGE_EXT_KERN_EXEC) \
 275                                  (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
 276                                  (type))
 277
 278 #elif defined(CONFIG_MMU) /* SH-X TLB */
 279 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE | \
 280                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 281
 282 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
 283                                  _PAGE_CACHABLE | _PAGE_ACCESSED | \
 284                                  _PAGE_FLAGS_HARD)
 285
 286 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
 287                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 288
 289 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | \
 290                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
 291
 292 #define PAGE_EXECREAD   PAGE_READONLY
 293 #define PAGE_RWX        PAGE_SHARED
 294 #define PAGE_WRITEONLY  PAGE_SHARED
 295
 296 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | \
 297                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 298                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 299
 300 #define PAGE_KERNEL_NOCACHE \
 301                         __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
 302                                  _PAGE_ACCESSED | _PAGE_HW_SHARED | \
 303                                  _PAGE_FLAGS_HARD)
 304
 305 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | \
 306                                  _PAGE_DIRTY | _PAGE_ACCESSED | \
 307                                  _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
 308
 309 #define PAGE_KERNEL_PCC(slot, type) \
 310                         __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
 311                                  _PAGE_ACCESSED | _PAGE_FLAGS_HARD | \
 312                                  (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | \
 313                                  (type))
 314 #else /* no mmu */
 315 #define PAGE_NONE               __pgprot(0)
 316 #define PAGE_SHARED             __pgprot(0)
 317 #define PAGE_COPY               __pgprot(0)
 318 #define PAGE_EXECREAD           __pgprot(0)
 319 #define PAGE_RWX                __pgprot(0)
 320 #define PAGE_READONLY           __pgprot(0)
 321 #define PAGE_WRITEONLY          __pgprot(0)
 322 #define PAGE_KERNEL             __pgprot(0)
 323 #define PAGE_KERNEL_NOCACHE     __pgprot(0)
 324 #define PAGE_KERNEL_RO          __pgprot(0)
 325
 326 #define PAGE_KERNEL_PCC(slot, type) \
 327                                 __pgprot(0)
 328 #endif
 329
 330 #endif /* __ASSEMBLY__ */
 331
 332 /*
 333  * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page
 334  * protection for execute, and considers it the same as a read. Also, write
 335  * permission implies read permission. This is the closest we can get..
 336  *
 337  * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme,
 338  * not only supporting separate execute, read, and write bits, but having
 339  * completely separate permission bits for user and kernel space.
 340  */
 341          /*xwr*/
 342 #define __P000  PAGE_NONE
 343 #define __P001  PAGE_READONLY
 344 #define __P010  PAGE_COPY
 345 #define __P011  PAGE_COPY
 346 #define __P100  PAGE_EXECREAD
 347 #define __P101  PAGE_EXECREAD
 348 #define __P110  PAGE_COPY
 349 #define __P111  PAGE_COPY
 350
 351 #define __S000  PAGE_NONE
 352 #define __S001  PAGE_READONLY
 353 #define __S010  PAGE_WRITEONLY
 354 #define __S011  PAGE_SHARED
 355 #define __S100  PAGE_EXECREAD
 356 #define __S101  PAGE_EXECREAD
 357 #define __S110  PAGE_RWX
 358 #define __S111  PAGE_RWX
 359
 360 #ifndef __ASSEMBLY__
 361
 362 /*
 363  * Certain architectures need to do special things when PTEs
 364  * within a page table are directly modified.  Thus, the following
 365  * hook is made available.
 366  */
 367 #ifdef CONFIG_X2TLB
 368 static inline void set_pte(pte_t *ptep, pte_t pte)
 369 {
 370         ptep->pte_high = pte.pte_high;
 371         smp_wmb();
 372         ptep->pte_low = pte.pte_low;
 373 }
 374 #else
 375 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
 376 #endif
 377
 378 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 379
 380 /*
 381  * (pmds are folded into pgds so this doesn't get actually called,
 382  * but the define is needed for a generic inline function.)
 383  */
 384 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
 385
 386 #define pte_pfn(x)              ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
 387
 388 #define pfn_pte(pfn, prot) \
 389         __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 390 #define pfn_pmd(pfn, prot) \
 391         __pmd(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 392
 393 #define pte_none(x)             (!pte_val(x))
 394 #define pte_present(x)          ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
 395
 396 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 397
 398 #define pmd_none(x)     (!pmd_val(x))
 399 #define pmd_present(x)  (pmd_val(x))
 400 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 401 #define pmd_bad(x)      (pmd_val(x) & ~PAGE_MASK)
 402
 403 #define pages_to_mb(x)  ((x) >> (20-PAGE_SHIFT))
 404 #define pte_page(x)     pfn_to_page(pte_pfn(x))
 405
 406 /*
 407  * The following only work if pte_present() is true.
 408  * Undefined behaviour if not..
 409  */
 410 #define pte_not_present(pte)    (!((pte).pte_low & _PAGE_PRESENT))
 411 #define pte_dirty(pte)          ((pte).pte_low & _PAGE_DIRTY)
 412 #define pte_young(pte)          ((pte).pte_low & _PAGE_ACCESSED)
 413 #define pte_file(pte)           ((pte).pte_low & _PAGE_FILE)
 414
 415 #ifdef CONFIG_X2TLB
 416 #define pte_write(pte)          ((pte).pte_high & _PAGE_EXT_USER_WRITE)
 417 #else
 418 #define pte_write(pte)          ((pte).pte_low & _PAGE_RW)
 419 #endif
 420
 421 #define PTE_BIT_FUNC(h,fn,op) \
 422 static inline pte_t pte_##fn(pte_t pte) { pte.pte_##h op; return pte; }
 423
 424 #ifdef CONFIG_X2TLB
 425 /*
 426  * We cheat a bit in the SH-X2 TLB case. As the permission bits are
 427  * individually toggled (and user permissions are entirely decoupled from
 428  * kernel permissions), we attempt to couple them a bit more sanely here.
 429  */
 430 PTE_BIT_FUNC(high, wrprotect, &= ~_PAGE_EXT_USER_WRITE);
 431 PTE_BIT_FUNC(high, mkwrite, |= _PAGE_EXT_USER_WRITE | _PAGE_EXT_KERN_WRITE);
 432 PTE_BIT_FUNC(high, mkhuge, |= _PAGE_SZHUGE);
 433 #else
 434 PTE_BIT_FUNC(low, wrprotect, &= ~_PAGE_RW);
 435 PTE_BIT_FUNC(low, mkwrite, |= _PAGE_RW);
 436 PTE_BIT_FUNC(low, mkhuge, |= _PAGE_SZHUGE);
 437 #endif
 438
 439 PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY);
 440 PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY);
 441 PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED);
 442 PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED);
 443
 444 /*
 445  * Macro and implementation to make a page protection as uncachable.
 446  */
 447 #define pgprot_writecombine(prot) \
 448         __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
 449
 450 #define pgprot_noncached         pgprot_writecombine
 451
 452 /*
 453  * Conversion functions: convert a page and protection to a page entry,
 454  * and a page entry and page directory to the page they refer to.
 455  *
 456  * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 457  */
 458 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 459
 460 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 461 {
 462         pte.pte_low &= _PAGE_CHG_MASK;
 463         pte.pte_low |= pgprot_val(newprot);
 464
 465 #ifdef CONFIG_X2TLB
 466         pte.pte_high |= pgprot_val(newprot) >> 32;
 467 #endif
 468
 469         return pte;
 470 }
 471
 472 #define pmd_page_vaddr(pmd)     ((unsigned long)pmd_val(pmd))
 473 #define pmd_page(pmd)           (virt_to_page(pmd_val(pmd)))
 474
 475 /* to find an entry in a page-table-directory. */
 476 #define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 477 #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
 478
 479 /* to find an entry in a kernel page-table-directory */
 480 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 481
 482 /* Find an entry in the third-level page table.. */
 483 #define pte_index(address)      ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 484 #define pte_offset_kernel(dir, address) \
 485         ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
 486 #define pte_offset_map(dir, address)            pte_offset_kernel(dir, address)
 487 #define pte_offset_map_nested(dir, address)     pte_offset_kernel(dir, address)
 488
 489 #define pte_unmap(pte)          do { } while (0)
 490 #define pte_unmap_nested(pte)   do { } while (0)
 491
 492 #ifdef CONFIG_X2TLB
 493 #define pte_ERROR(e) \
 494         printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, \
 495                &(e), (e).pte_high, (e).pte_low)
 496 #define pgd_ERROR(e) \
 497         printk("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e))
 498 #else
 499 #define pte_ERROR(e) \
 500         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 501 #define pgd_ERROR(e) \
 502         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 503 #endif
 504
 505 struct vm_area_struct;
 506 extern void update_mmu_cache(struct vm_area_struct * vma,
 507                              unsigned long address, pte_t pte);
 508
 509 /*
 510  * Encode and de-code a swap entry
 511  *
 512  * Constraints:
 513  *      _PAGE_FILE at bit 0
 514  *      _PAGE_PRESENT at bit 8
 515  *      _PAGE_PROTNONE at bit 9
 516  *
 517  * For the normal case, we encode the swap type into bits 0:7 and the
 518  * swap offset into bits 10:30. For the 64-bit PTE case, we keep the
 519  * preserved bits in the low 32-bits and use the upper 32 as the swap
 520  * offset (along with a 5-bit type), following the same approach as x86
 521  * PAE. This keeps the logic quite simple, and allows for a full 32
 522  * PTE_FILE_MAX_BITS, as opposed to the 29-bits we're constrained with
 523  * in the pte_low case.
 524  *
 525  * As is evident by the Alpha code, if we ever get a 64-bit unsigned
 526  * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes
 527  * much cleaner..
 528  *
 529  * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
 530  *       and _PAGE_PROTNONE bits
 531  */
 532 #ifdef CONFIG_X2TLB
 533 #define __swp_type(x)                   ((x).val & 0x1f)
 534 #define __swp_offset(x)                 ((x).val >> 5)
 535 #define __swp_entry(type, offset)       ((swp_entry_t){ (type) | (offset) << 5})
 536 #define __pte_to_swp_entry(pte)         ((swp_entry_t){ (pte).pte_high })
 537 #define __swp_entry_to_pte(x)           ((pte_t){ 0, (x).val })
 538
 539 /*
 540  * Encode and decode a nonlinear file mapping entry
 541  */
 542 #define pte_to_pgoff(pte)               ((pte).pte_high)
 543 #define pgoff_to_pte(off)               ((pte_t) { _PAGE_FILE, (off) })
 544
 545 #define PTE_FILE_MAX_BITS               32
 546 #else
 547 #define __swp_type(x)                   ((x).val & 0xff)
 548 #define __swp_offset(x)                 ((x).val >> 10)
 549 #define __swp_entry(type, offset)       ((swp_entry_t){(type) | (offset) <<10})
 550
 551 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) >> 1 })
 552 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val << 1 })
 553
 554 /*
 555  * Encode and decode a nonlinear file mapping entry
 556  */
 557 #define PTE_FILE_MAX_BITS       29
 558 #define pte_to_pgoff(pte)       (pte_val(pte) >> 1)
 559 #define pgoff_to_pte(off)       ((pte_t) { ((off) << 1) | _PAGE_FILE })
 560 #endif
 561
 562 typedef pte_t *pte_addr_t;
 563
 564 #define kern_addr_valid(addr)   (1)
 565
 566 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 567                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 568
 569 struct mm_struct;
 570
 571 /*
 572  * No page table caches to initialise
 573  */
 574 #define pgtable_cache_init()    do { } while (0)
 575
 576 #ifndef CONFIG_MMU
 577 extern unsigned int kobjsize(const void *objp);
 578 #endif /* !CONFIG_MMU */
 579
 580 #if !defined(CONFIG_CACHE_OFF) && (defined(CONFIG_CPU_SH4) || \
 581         defined(CONFIG_SH7705_CACHE_32KB))
 582 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 583 extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
 584 #endif
 585
 586 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 587 extern void paging_init(void);
 588
 589 #include <asm-generic/pgtable.h>
 590
 591 #endif /* !__ASSEMBLY__ */
 592 #endif /* __ASM_SH_PAGE_H */