include/asm-sh64/pgtable.h

   1 #ifndef __ASM_SH64_PGTABLE_H
   2 #define __ASM_SH64_PGTABLE_H
   3
   4 #include <asm-generic/4level-fixup.h>
   5
   6 /*
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  *
  11  * include/asm-sh64/pgtable.h
  12  *
  13  * Copyright (C) 2000, 2001  Paolo Alberelli
  14  * Copyright (C) 2003, 2004  Paul Mundt
  15  * Copyright (C) 2003, 2004  Richard Curnow
  16  *
  17  * This file contains the functions and defines necessary to modify and use
  18  * the SuperH page table tree.
  19  */
  20
  21 #ifndef __ASSEMBLY__
  22 #include <asm/processor.h>
  23 #include <asm/page.h>
  24 #include <linux/threads.h>
  25 #include <linux/config.h>
  26
  27 extern void paging_init(void);
  28
  29 /* We provide our own get_unmapped_area to avoid cache synonym issue */
  30 #define HAVE_ARCH_UNMAPPED_AREA
  31
  32 /*
  33  * Basically we have the same two-level (which is the logical three level
  34  * Linux page table layout folded) page tables as the i386.
  35  */
  36
  37 /*
  38  * ZERO_PAGE is a global shared page that is always zero: used
  39  * for zero-mapped memory areas etc..
  40  */
  41 extern unsigned char empty_zero_page[PAGE_SIZE];
  42 #define ZERO_PAGE(vaddr) (mem_map + MAP_NR(empty_zero_page))
  43
  44 #endif /* !__ASSEMBLY__ */
  45
  46 /*
  47  * NEFF and NPHYS related defines.
  48  * FIXME : These need to be model-dependent.  For now this is OK, SH5-101 and SH5-103
  49  * implement 32 bits effective and 32 bits physical.  But future implementations may
  50  * extend beyond this.
  51  */
  52 #define NEFF            32
  53 #define NEFF_SIGN       (1LL << (NEFF - 1))
  54 #define NEFF_MASK       (-1LL << NEFF)
  55
  56 #define NPHYS           32
  57 #define NPHYS_SIGN      (1LL << (NPHYS - 1))
  58 #define NPHYS_MASK      (-1LL << NPHYS)
  59
  60 /* Typically 2-level is sufficient up to 32 bits of virtual address space, beyond
  61    that 3-level would be appropriate. */
  62 #if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
  63 /* For 4k pages, this contains 512 entries, i.e. 9 bits worth of address. */
  64 #define PTRS_PER_PTE    ((1<<PAGE_SHIFT)/sizeof(unsigned long long))
  65 #define PTE_MAGNITUDE   3             /* sizeof(unsigned long long) magnit. */
  66 #define PTE_SHIFT       PAGE_SHIFT
  67 #define PTE_BITS        (PAGE_SHIFT - PTE_MAGNITUDE)
  68
  69 /* top level: PMD. */
  70 #define PGDIR_SHIFT     (PTE_SHIFT + PTE_BITS)
  71 #define PGD_BITS        (NEFF - PGDIR_SHIFT)
  72 #define PTRS_PER_PGD    (1<<PGD_BITS)
  73
  74 /* middle level: PMD. This doesn't do anything for the 2-level case. */
  75 #define PTRS_PER_PMD    (1)
  76
  77 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  78 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
  79 #define PMD_SHIFT       PGDIR_SHIFT
  80 #define PMD_SIZE        PGDIR_SIZE
  81 #define PMD_MASK        PGDIR_MASK
  82
  83 #elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
  84 /*
  85  * three-level asymmetric paging structure: PGD is top level.
  86  * The asymmetry comes from 32-bit pointers and 64-bit PTEs.
  87  */
  88 /* bottom level: PTE. It's 9 bits = 512 pointers */
  89 #define PTRS_PER_PTE    ((1<<PAGE_SHIFT)/sizeof(unsigned long long))
  90 #define PTE_MAGNITUDE   3             /* sizeof(unsigned long long) magnit. */
  91 #define PTE_SHIFT       PAGE_SHIFT
  92 #define PTE_BITS        (PAGE_SHIFT - PTE_MAGNITUDE)
  93
  94 /* middle level: PMD. It's 10 bits = 1024 pointers */
  95 #define PTRS_PER_PMD    ((1<<PAGE_SHIFT)/sizeof(unsigned long long *))
  96 #define PMD_MAGNITUDE   2             /* sizeof(unsigned long long *) magnit. */
  97 #define PMD_SHIFT       (PTE_SHIFT + PTE_BITS)
  98 #define PMD_BITS        (PAGE_SHIFT - PMD_MAGNITUDE)
  99
 100 /* top level: PMD. It's 1 bit = 2 pointers */
 101 #define PGDIR_SHIFT     (PMD_SHIFT + PMD_BITS)
 102 #define PGD_BITS        (NEFF - PGDIR_SHIFT)
 103 #define PTRS_PER_PGD    (1<<PGD_BITS)
 104
 105 #define PMD_SIZE        (1UL << PMD_SHIFT)
 106 #define PMD_MASK        (~(PMD_SIZE-1))
 107 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
 108 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
 109
 110 #else
 111 #error "No defined number of page table levels"
 112 #endif
 113
 114 /*
 115  * Error outputs.
 116  */
 117 #define pte_ERROR(e) \
 118         printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
 119 #define pmd_ERROR(e) \
 120         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 121 #define pgd_ERROR(e) \
 122         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 123
 124 /*
 125  * Table setting routines. Used within arch/mm only.
 126  */
 127 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
 128 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
 129
 130 static __inline__ void set_pte(pte_t *pteptr, pte_t pteval)
 131 {
 132         unsigned long long x = ((unsigned long long) pteval.pte);
 133         unsigned long long *xp = (unsigned long long *) pteptr;
 134         /*
 135          * Sign-extend based on NPHYS.
 136          */
 137         *(xp) = (x & NPHYS_SIGN) ? (x | NPHYS_MASK) : x;
 138 }
 139 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 140
 141 static __inline__ void pmd_set(pmd_t *pmdp,pte_t *ptep)
 142 {
 143         pmd_val(*pmdp) = (unsigned long) ptep;
 144 }
 145
 146 /*
 147  * PGD defines. Top level.
 148  */
 149
 150 /* To find an entry in a generic PGD. */
 151 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 152 #define __pgd_offset(address) pgd_index(address)
 153 #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
 154
 155 /* To find an entry in a kernel PGD. */
 156 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 157
 158 /*
 159  * PGD level access routines.
 160  *
 161  * Note1:
 162  * There's no need to use physical addresses since the tree walk is all
 163  * in performed in software, until the PTE translation.
 164  *
 165  * Note 2:
 166  * A PGD entry can be uninitialized (_PGD_UNUSED), generically bad,
 167  * clear (_PGD_EMPTY), present. When present, lower 3 nibbles contain
 168  * _KERNPG_TABLE. Being a kernel virtual pointer also bit 31 must
 169  * be 1. Assuming an arbitrary clear value of bit 31 set to 0 and
 170  * lower 3 nibbles set to 0xFFF (_PGD_EMPTY) any other value is a
 171  * bad pgd that must be notified via printk().
 172  *
 173  */
 174 #define _PGD_EMPTY              0x0
 175
 176 #if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
 177 static inline int pgd_none(pgd_t pgd)           { return 0; }
 178 static inline int pgd_bad(pgd_t pgd)            { return 0; }
 179 #define pgd_present(pgd) ((pgd_val(pgd) & _PAGE_PRESENT) ? 1 : 0)
 180 #define pgd_clear(xx)                           do { } while(0)
 181
 182 #elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
 183 #define pgd_present(pgd_entry)  (1)
 184 #define pgd_none(pgd_entry)     (pgd_val((pgd_entry)) == _PGD_EMPTY)
 185 /* TODO: Think later about what a useful definition of 'bad' would be now. */
 186 #define pgd_bad(pgd_entry)      (0)
 187 #define pgd_clear(pgd_entry_p)  (set_pgd((pgd_entry_p), __pgd(_PGD_EMPTY)))
 188
 189 #endif
 190
 191
 192 #define pgd_page(pgd_entry)     ((unsigned long) (pgd_val(pgd_entry) & PAGE_MASK))
 193
 194 /*
 195  * PMD defines. Middle level.
 196  */
 197
 198 /* PGD to PMD dereferencing */
 199 #if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
 200 static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
 201 {
 202         return (pmd_t *) dir;
 203 }
 204 #elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
 205 #define __pmd_offset(address) \
 206                 (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 207 #define pmd_offset(dir, addr) \
 208                 ((pmd_t *) ((pgd_val(*(dir))) & PAGE_MASK) + __pmd_offset((addr)))
 209 #endif
 210
 211 /*
 212  * PMD level access routines. Same notes as above.
 213  */
 214 #define _PMD_EMPTY              0x0
 215 /* Either the PMD is empty or present, it's not paged out */
 216 #define pmd_present(pmd_entry)  (pmd_val(pmd_entry) & _PAGE_PRESENT)
 217 #define pmd_clear(pmd_entry_p)  (set_pmd((pmd_entry_p), __pmd(_PMD_EMPTY)))
 218 #define pmd_none(pmd_entry)     (pmd_val((pmd_entry)) == _PMD_EMPTY)
 219 #define pmd_bad(pmd_entry)      ((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
 220
 221 #define pmd_page_kernel(pmd_entry) \
 222         ((unsigned long) __va(pmd_val(pmd_entry) & PAGE_MASK))
 223
 224 #define pmd_page(pmd) \
 225         (virt_to_page(pmd_val(pmd)))
 226
 227 /* PMD to PTE dereferencing */
 228 #define pte_index(address) \
 229                 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 230
 231 #define pte_offset_kernel(dir, addr) \
 232                 ((pte_t *) ((pmd_val(*(dir))) & PAGE_MASK) + pte_index((addr)))
 233
 234 #define pte_offset_map(dir,addr)        pte_offset_kernel(dir, addr)
 235 #define pte_offset_map_nested(dir,addr) pte_offset_kernel(dir, addr)
 236 #define pte_unmap(pte)          do { } while (0)
 237 #define pte_unmap_nested(pte)   do { } while (0)
 238
 239 /* Round it up ! */
 240 #define USER_PTRS_PER_PGD       ((TASK_SIZE+PGDIR_SIZE-1)/PGDIR_SIZE)
 241 #define FIRST_USER_ADDRESS      0
 242
 243 #ifndef __ASSEMBLY__
 244 #define VMALLOC_END     0xff000000
 245 #define VMALLOC_START   0xf0000000
 246 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
 247
 248 #define IOBASE_VADDR    0xff000000
 249 #define IOBASE_END      0xffffffff
 250
 251 /*
 252  * PTEL coherent flags.
 253  * See Chapter 17 ST50 CPU Core Volume 1, Architecture.
 254  */
 255 /* The bits that are required in the SH-5 TLB are placed in the h/w-defined
 256    positions, to avoid expensive bit shuffling on every refill.  The remaining
 257    bits are used for s/w purposes and masked out on each refill.
 258
 259    Note, the PTE slots are used to hold data of type swp_entry_t when a page is
 260    swapped out.  Only the _PAGE_PRESENT flag is significant when the page is
 261    swapped out, and it must be placed so that it doesn't overlap either the
 262    type or offset fields of swp_entry_t.  For x86, offset is at [31:8] and type
 263    at [6:1], with _PAGE_PRESENT at bit 0 for both pte_t and swp_entry_t.  This
 264    scheme doesn't map to SH-5 because bit [0] controls cacheability.  So bit
 265    [2] is used for _PAGE_PRESENT and the type field of swp_entry_t is split
 266    into 2 pieces.  That is handled by SWP_ENTRY and SWP_TYPE below. */
 267 #define _PAGE_WT        0x001  /* CB0: if cacheable, 1->write-thru, 0->write-back */
 268 #define _PAGE_DEVICE    0x001  /* CB0: if uncacheable, 1->device (i.e. no write-combining or reordering at bus level) */
 269 #define _PAGE_CACHABLE  0x002  /* CB1: uncachable/cachable */
 270 #define _PAGE_PRESENT   0x004  /* software: page referenced */
 271 #define _PAGE_FILE      0x004  /* software: only when !present */
 272 #define _PAGE_SIZE0     0x008  /* SZ0-bit : size of page */
 273 #define _PAGE_SIZE1     0x010  /* SZ1-bit : size of page */
 274 #define _PAGE_SHARED    0x020  /* software: reflects PTEH's SH */
 275 #define _PAGE_READ      0x040  /* PR0-bit : read access allowed */
 276 #define _PAGE_EXECUTE   0x080  /* PR1-bit : execute access allowed */
 277 #define _PAGE_WRITE     0x100  /* PR2-bit : write access allowed */
 278 #define _PAGE_USER      0x200  /* PR3-bit : user space access allowed */
 279 #define _PAGE_DIRTY     0x400  /* software: page accessed in write */
 280 #define _PAGE_ACCESSED  0x800  /* software: page referenced */
 281
 282 /* Mask which drops software flags */
 283 #define _PAGE_FLAGS_HARDWARE_MASK       0xfffffffffffff3dbLL
 284
 285 /*
 286  * HugeTLB support
 287  */
 288 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
 289 #define _PAGE_SZHUGE    (_PAGE_SIZE0)
 290 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
 291 #define _PAGE_SZHUGE    (_PAGE_SIZE1)
 292 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
 293 #define _PAGE_SZHUGE    (_PAGE_SIZE0 | _PAGE_SIZE1)
 294 #endif
 295
 296 /*
 297  * Default flags for a Kernel page.
 298  * This is fundametally also SHARED because the main use of this define
 299  * (other than for PGD/PMD entries) is for the VMALLOC pool which is
 300  * contextless.
 301  *
 302  * _PAGE_EXECUTE is required for modules
 303  *
 304  */
 305 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
 306                          _PAGE_EXECUTE | \
 307                          _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_DIRTY | \
 308                          _PAGE_SHARED)
 309
 310 /* Default flags for a User page */
 311 #define _PAGE_TABLE     (_KERNPG_TABLE | _PAGE_USER)
 312
 313 #define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 314
 315 #define PAGE_NONE       __pgprot(_PAGE_CACHABLE | _PAGE_ACCESSED)
 316 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
 317                                  _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_USER | \
 318                                  _PAGE_SHARED)
 319 /* We need to include PAGE_EXECUTE in PAGE_COPY because it is the default
 320  * protection mode for the stack. */
 321 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHABLE | \
 322                                  _PAGE_ACCESSED | _PAGE_USER | _PAGE_EXECUTE)
 323 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHABLE | \
 324                                  _PAGE_ACCESSED | _PAGE_USER)
 325 #define PAGE_KERNEL     __pgprot(_KERNPG_TABLE)
 326
 327
 328 /*
 329  * In ST50 we have full permissions (Read/Write/Execute/Shared).
 330  * Just match'em all. These are for mmap(), therefore all at least
 331  * User/Cachable/Present/Accessed. No point in making Fault on Write.
 332  */
 333 #define __MMAP_COMMON   (_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED)
 334        /* sxwr */
 335 #define __P000  __pgprot(__MMAP_COMMON)
 336 #define __P001  __pgprot(__MMAP_COMMON | _PAGE_READ)
 337 #define __P010  __pgprot(__MMAP_COMMON)
 338 #define __P011  __pgprot(__MMAP_COMMON | _PAGE_READ)
 339 #define __P100  __pgprot(__MMAP_COMMON | _PAGE_EXECUTE)
 340 #define __P101  __pgprot(__MMAP_COMMON | _PAGE_EXECUTE | _PAGE_READ)
 341 #define __P110  __pgprot(__MMAP_COMMON | _PAGE_EXECUTE)
 342 #define __P111  __pgprot(__MMAP_COMMON | _PAGE_EXECUTE | _PAGE_READ)
 343
 344 #define __S000  __pgprot(__MMAP_COMMON | _PAGE_SHARED)
 345 #define __S001  __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_READ)
 346 #define __S010  __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_WRITE)
 347 #define __S011  __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_READ | _PAGE_WRITE)
 348 #define __S100  __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE)
 349 #define __S101  __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_READ)
 350 #define __S110  __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_WRITE)
 351 #define __S111  __pgprot(__MMAP_COMMON | _PAGE_SHARED | _PAGE_EXECUTE | _PAGE_READ | _PAGE_WRITE)
 352
 353 /* Make it a device mapping for maximum safety (e.g. for mapping device
 354    registers into user-space via /dev/map).  */
 355 #define pgprot_noncached(x) __pgprot(((x).pgprot & ~(_PAGE_CACHABLE)) | _PAGE_DEVICE)
 356 #define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
 357
 358 /*
 359  * Handling allocation failures during page table setup.
 360  */
 361 extern void __handle_bad_pmd_kernel(pmd_t * pmd);
 362 #define __handle_bad_pmd(x)     __handle_bad_pmd_kernel(x)
 363
 364 /*
 365  * PTE level access routines.
 366  *
 367  * Note1:
 368  * It's the tree walk leaf. This is physical address to be stored.
 369  *
 370  * Note 2:
 371  * Regarding the choice of _PTE_EMPTY:
 372
 373    We must choose a bit pattern that cannot be valid, whether or not the page
 374    is present.  bit[2]==1 => present, bit[2]==0 => swapped out.  If swapped
 375    out, bits [31:8], [6:3], [1:0] are under swapper control, so only bit[7] is
 376    left for us to select.  If we force bit[7]==0 when swapped out, we could use
 377    the combination bit[7,2]=2'b10 to indicate an empty PTE.  Alternatively, if
 378    we force bit[7]==1 when swapped out, we can use all zeroes to indicate
 379    empty.  This is convenient, because the page tables get cleared to zero
 380    when they are allocated.
 381
 382  */
 383 #define _PTE_EMPTY      0x0
 384 #define pte_present(x)  (pte_val(x) & _PAGE_PRESENT)
 385 #define pte_clear(mm,addr,xp)   (set_pte_at(mm, addr, xp, __pte(_PTE_EMPTY)))
 386 #define pte_none(x)     (pte_val(x) == _PTE_EMPTY)
 387
 388 /*
 389  * Some definitions to translate between mem_map, PTEs, and page
 390  * addresses:
 391  */
 392
 393 /*
 394  * Given a PTE, return the index of the mem_map[] entry corresponding
 395  * to the page frame the PTE. Get the absolute physical address, make
 396  * a relative physical address and translate it to an index.
 397  */
 398 #define pte_pagenr(x)           (((unsigned long) (pte_val(x)) - \
 399                                  __MEMORY_START) >> PAGE_SHIFT)
 400
 401 /*
 402  * Given a PTE, return the "struct page *".
 403  */
 404 #define pte_page(x)             (mem_map + pte_pagenr(x))
 405
 406 /*
 407  * Return number of (down rounded) MB corresponding to x pages.
 408  */
 409 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
 410
 411
 412 /*
 413  * The following have defined behavior only work if pte_present() is true.
 414  */
 415 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
 416 static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXECUTE; }
 417 static inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
 418 static inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
 419 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
 420 static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_WRITE; }
 421
 422 extern inline pte_t pte_rdprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_READ)); return pte; }
 423 extern inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); return pte; }
 424 extern inline pte_t pte_exprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_EXECUTE)); return pte; }
 425 extern inline pte_t pte_mkclean(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
 426 extern inline pte_t pte_mkold(pte_t pte)        { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
 427
 428 extern inline pte_t pte_mkread(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_READ)); return pte; }
 429 extern inline pte_t pte_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_WRITE)); return pte; }
 430 extern inline pte_t pte_mkexec(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_EXECUTE)); return pte; }
 431 extern inline pte_t pte_mkdirty(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
 432 extern inline pte_t pte_mkyoung(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
 433
 434 /*
 435  * Conversion functions: convert a page and protection to a page entry.
 436  *
 437  * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 438  */
 439 #define mk_pte(page,pgprot)                                                     \
 440 ({                                                                              \
 441         pte_t __pte;                                                            \
 442                                                                                 \
 443         set_pte(&__pte, __pte((((page)-mem_map) << PAGE_SHIFT) |                \
 444                 __MEMORY_START | pgprot_val((pgprot))));                        \
 445         __pte;                                                                  \
 446 })
 447
 448 /*
 449  * This takes a (absolute) physical page address that is used
 450  * by the remapping functions
 451  */
 452 #define mk_pte_phys(physpage, pgprot) \
 453 ({ pte_t __pte; set_pte(&__pte, __pte(physpage | pgprot_val(pgprot))); __pte; })
 454
 455 extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 456 { set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }
 457
 458 #define page_pte_prot(page, prot) mk_pte(page, prot)
 459 #define page_pte(page) page_pte_prot(page, __pgprot(0))
 460
 461 typedef pte_t *pte_addr_t;
 462 #define pgtable_cache_init()    do { } while (0)
 463
 464 extern void update_mmu_cache(struct vm_area_struct * vma,
 465                              unsigned long address, pte_t pte);
 466
 467 /* Encode and decode a swap entry */
 468 #define __swp_type(x)                   (((x).val & 3) + (((x).val >> 1) & 0x3c))
 469 #define __swp_offset(x)                 ((x).val >> 8)
 470 #define __swp_entry(type, offset)       ((swp_entry_t) { ((offset << 8) + ((type & 0x3c) << 1) + (type & 3)) })
 471 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 472 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 473
 474 /* Encode and decode a nonlinear file mapping entry */
 475 #define PTE_FILE_MAX_BITS               29
 476 #define pte_to_pgoff(pte)               (pte_val(pte))
 477 #define pgoff_to_pte(off)               ((pte_t) { (off) | _PAGE_FILE })
 478
 479 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 480 #define PageSkip(page)          (0)
 481 #define kern_addr_valid(addr)   (1)
 482
 483 #define io_remap_page_range(vma, vaddr, paddr, size, prot)              \
 484                 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
 485
 486 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 487                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 488
 489 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 490 #define GET_IOSPACE(pfn)                0
 491 #define GET_PFN(pfn)                    (pfn)
 492
 493 #endif /* !__ASSEMBLY__ */
 494
 495 /*
 496  * No page table caches to initialise
 497  */
 498 #define pgtable_cache_init()    do { } while (0)
 499
 500 #define pte_pfn(x)              (((unsigned long)((x).pte)) >> PAGE_SHIFT)
 501 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 502 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 503
 504 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 505
 506 #include <asm-generic/pgtable.h>
 507
 508 #endif /* __ASM_SH64_PGTABLE_H */