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