arch/mn10300/include/asm/pgtable.h

   1 /* MN10300 Page table manipulators and constants
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  *
  11  *
  12  * The Linux memory management assumes a three-level page table setup. On
  13  * the i386, we use that, but "fold" the mid level into the top-level page
  14  * table, so that we physically have the same two-level page table as the
  15  * i386 mmu expects.
  16  *
  17  * This file contains the functions and defines necessary to modify and use
  18  * the i386 page table tree for the purposes of the MN10300 TLB handler
  19  * functions.
  20  */
  21 #ifndef _ASM_PGTABLE_H
  22 #define _ASM_PGTABLE_H
  23
  24 #include <asm/cpu-regs.h>
  25
  26 #ifndef __ASSEMBLY__
  27 #include <asm/processor.h>
  28 #include <asm/cache.h>
  29 #include <linux/threads.h>
  30
  31 #include <asm/bitops.h>
  32
  33 #include <linux/slab.h>
  34 #include <linux/list.h>
  35 #include <linux/spinlock.h>
  36
  37 /*
  38  * ZERO_PAGE is a global shared page that is always zero: used
  39  * for zero-mapped memory areas etc..
  40  */
  41 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  42 extern unsigned long empty_zero_page[1024];
  43 extern spinlock_t pgd_lock;
  44 extern struct page *pgd_list;
  45
  46 extern void pmd_ctor(void *, struct kmem_cache *, unsigned long);
  47 extern void pgtable_cache_init(void);
  48 extern void paging_init(void);
  49
  50 #endif /* !__ASSEMBLY__ */
  51
  52 /*
  53  * The Linux mn10300 paging architecture only implements both the traditional
  54  * 2-level page tables
  55  */
  56 #define PGDIR_SHIFT     22
  57 #define PTRS_PER_PGD    1024
  58 #define PTRS_PER_PUD    1       /* we don't really have any PUD physically */
  59 #define PTRS_PER_PMD    1       /* we don't really have any PMD physically */
  60 #define PTRS_PER_PTE    1024
  61
  62 #define PGD_SIZE        PAGE_SIZE
  63 #define PMD_SIZE        (1UL << PMD_SHIFT)
  64 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  65 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  66
  67 #define USER_PTRS_PER_PGD       (TASK_SIZE / PGDIR_SIZE)
  68 #define FIRST_USER_ADDRESS      0
  69
  70 #define USER_PGD_PTRS           (PAGE_OFFSET >> PGDIR_SHIFT)
  71 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - USER_PGD_PTRS)
  72
  73 #define TWOLEVEL_PGDIR_SHIFT    22
  74 #define BOOT_USER_PGD_PTRS      (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
  75 #define BOOT_KERNEL_PGD_PTRS    (1024 - BOOT_USER_PGD_PTRS)
  76
  77 #ifndef __ASSEMBLY__
  78 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
  79 #endif
  80
  81 /*
  82  * Unfortunately, due to the way the MMU works on the MN10300, the vmalloc VM
  83  * area has to be in the lower half of the virtual address range (the upper
  84  * half is not translated through the TLB).
  85  *
  86  * So in this case, the vmalloc area goes at the bottom of the address map
  87  * (leaving a hole at the very bottom to catch addressing errors), and
  88  * userspace starts immediately above.
  89  *
  90  * The vmalloc() routines also leaves a hole of 4kB between each vmalloced
  91  * area to catch addressing errors.
  92  */
  93 #ifndef __ASSEMBLY__
  94 #define VMALLOC_OFFSET  (8UL * 1024 * 1024)
  95 #define VMALLOC_START   (0x70000000UL)
  96 #define VMALLOC_END     (0x7C000000UL)
  97 #else
  98 #define VMALLOC_OFFSET  (8 * 1024 * 1024)
  99 #define VMALLOC_START   (0x70000000)
 100 #define VMALLOC_END     (0x7C000000)
 101 #endif
 102
 103 #ifndef __ASSEMBLY__
 104 extern pte_t kernel_vmalloc_ptes[(VMALLOC_END - VMALLOC_START) / PAGE_SIZE];
 105 #endif
 106
 107 /* IPTEL2/DPTEL2 bit assignments */
 108 #define _PAGE_BIT_VALID         xPTEL2_V_BIT
 109 #define _PAGE_BIT_CACHE         xPTEL2_C_BIT
 110 #define _PAGE_BIT_PRESENT       xPTEL2_PV_BIT
 111 #define _PAGE_BIT_DIRTY         xPTEL2_D_BIT
 112 #define _PAGE_BIT_GLOBAL        xPTEL2_G_BIT
 113 #define _PAGE_BIT_ACCESSED      xPTEL2_UNUSED1_BIT      /* mustn't be loaded into IPTEL2/DPTEL2 */
 114
 115 #define _PAGE_VALID             xPTEL2_V
 116 #define _PAGE_CACHE             xPTEL2_C
 117 #define _PAGE_PRESENT           xPTEL2_PV
 118 #define _PAGE_DIRTY             xPTEL2_D
 119 #define _PAGE_PROT              xPTEL2_PR
 120 #define _PAGE_PROT_RKNU         xPTEL2_PR_ROK
 121 #define _PAGE_PROT_WKNU         xPTEL2_PR_RWK
 122 #define _PAGE_PROT_RKRU         xPTEL2_PR_ROK_ROU
 123 #define _PAGE_PROT_WKRU         xPTEL2_PR_RWK_ROU
 124 #define _PAGE_PROT_WKWU         xPTEL2_PR_RWK_RWU
 125 #define _PAGE_GLOBAL            xPTEL2_G
 126 #define _PAGE_PS_MASK           xPTEL2_PS
 127 #define _PAGE_PS_4Kb            xPTEL2_PS_4Kb
 128 #define _PAGE_PS_128Kb          xPTEL2_PS_128Kb
 129 #define _PAGE_PS_1Kb            xPTEL2_PS_1Kb
 130 #define _PAGE_PS_4Mb            xPTEL2_PS_4Mb
 131 #define _PAGE_PSE               xPTEL2_PS_4Mb           /* 4MB page */
 132 #define _PAGE_CACHE_WT          xPTEL2_CWT
 133 #define _PAGE_ACCESSED          xPTEL2_UNUSED1
 134 #define _PAGE_NX                0                       /* no-execute bit */
 135
 136 /* If _PAGE_VALID is clear, we use these: */
 137 #define _PAGE_FILE              xPTEL2_C        /* set:pagecache unset:swap */
 138 #define _PAGE_PROTNONE          0x000           /* If not present */
 139
 140 #define __PAGE_PROT_UWAUX       0x010
 141 #define __PAGE_PROT_USER        0x020
 142 #define __PAGE_PROT_WRITE       0x040
 143
 144 #define _PAGE_PRESENTV          (_PAGE_PRESENT|_PAGE_VALID)
 145
 146 #ifndef __ASSEMBLY__
 147
 148 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
 149
 150 #define _PAGE_TABLE     (_PAGE_PRESENTV | _PAGE_PROT_WKNU | _PAGE_ACCESSED | _PAGE_DIRTY)
 151 #define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 152
 153 #define __PAGE_NONE     (_PAGE_PRESENTV | _PAGE_PROT_RKNU | _PAGE_ACCESSED | _PAGE_CACHE)
 154 #define __PAGE_SHARED   (_PAGE_PRESENTV | _PAGE_PROT_WKWU | _PAGE_ACCESSED | _PAGE_CACHE)
 155 #define __PAGE_COPY     (_PAGE_PRESENTV | _PAGE_PROT_RKRU | _PAGE_ACCESSED | _PAGE_CACHE)
 156 #define __PAGE_READONLY (_PAGE_PRESENTV | _PAGE_PROT_RKRU | _PAGE_ACCESSED | _PAGE_CACHE)
 157
 158 #define PAGE_NONE               __pgprot(__PAGE_NONE     | _PAGE_NX)
 159 #define PAGE_SHARED_NOEXEC      __pgprot(__PAGE_SHARED   | _PAGE_NX)
 160 #define PAGE_COPY_NOEXEC        __pgprot(__PAGE_COPY     | _PAGE_NX)
 161 #define PAGE_READONLY_NOEXEC    __pgprot(__PAGE_READONLY | _PAGE_NX)
 162 #define PAGE_SHARED_EXEC        __pgprot(__PAGE_SHARED)
 163 #define PAGE_COPY_EXEC          __pgprot(__PAGE_COPY)
 164 #define PAGE_READONLY_EXEC      __pgprot(__PAGE_READONLY)
 165 #define PAGE_COPY               PAGE_COPY_NOEXEC
 166 #define PAGE_READONLY           PAGE_READONLY_NOEXEC
 167 #define PAGE_SHARED             PAGE_SHARED_EXEC
 168
 169 #define __PAGE_KERNEL_BASE (_PAGE_PRESENTV | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
 170
 171 #define __PAGE_KERNEL           (__PAGE_KERNEL_BASE | _PAGE_PROT_WKNU | _PAGE_CACHE | _PAGE_NX)
 172 #define __PAGE_KERNEL_NOCACHE   (__PAGE_KERNEL_BASE | _PAGE_PROT_WKNU | _PAGE_NX)
 173 #define __PAGE_KERNEL_EXEC      (__PAGE_KERNEL & ~_PAGE_NX)
 174 #define __PAGE_KERNEL_RO        (__PAGE_KERNEL_BASE | _PAGE_PROT_RKNU | _PAGE_CACHE | _PAGE_NX)
 175 #define __PAGE_KERNEL_LARGE     (__PAGE_KERNEL | _PAGE_PSE)
 176 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 177
 178 #define PAGE_KERNEL             __pgprot(__PAGE_KERNEL)
 179 #define PAGE_KERNEL_RO          __pgprot(__PAGE_KERNEL_RO)
 180 #define PAGE_KERNEL_EXEC        __pgprot(__PAGE_KERNEL_EXEC)
 181 #define PAGE_KERNEL_NOCACHE     __pgprot(__PAGE_KERNEL_NOCACHE)
 182 #define PAGE_KERNEL_LARGE       __pgprot(__PAGE_KERNEL_LARGE)
 183 #define PAGE_KERNEL_LARGE_EXEC  __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 184
 185 #define __PAGE_USERIO           (__PAGE_KERNEL_BASE | _PAGE_PROT_WKWU | _PAGE_NX)
 186 #define PAGE_USERIO             __pgprot(__PAGE_USERIO)
 187
 188 /*
 189  * Whilst the MN10300 can do page protection for execute (given separate data
 190  * and insn TLBs), we are not supporting it at the moment. Write permission,
 191  * however, always implies read permission (but not execute permission).
 192  */
 193 #define __P000  PAGE_NONE
 194 #define __P001  PAGE_READONLY_NOEXEC
 195 #define __P010  PAGE_COPY_NOEXEC
 196 #define __P011  PAGE_COPY_NOEXEC
 197 #define __P100  PAGE_READONLY_EXEC
 198 #define __P101  PAGE_READONLY_EXEC
 199 #define __P110  PAGE_COPY_EXEC
 200 #define __P111  PAGE_COPY_EXEC
 201
 202 #define __S000  PAGE_NONE
 203 #define __S001  PAGE_READONLY_NOEXEC
 204 #define __S010  PAGE_SHARED_NOEXEC
 205 #define __S011  PAGE_SHARED_NOEXEC
 206 #define __S100  PAGE_READONLY_EXEC
 207 #define __S101  PAGE_READONLY_EXEC
 208 #define __S110  PAGE_SHARED_EXEC
 209 #define __S111  PAGE_SHARED_EXEC
 210
 211 /*
 212  * Define this to warn about kernel memory accesses that are
 213  * done without a 'verify_area(VERIFY_WRITE,..)'
 214  */
 215 #undef TEST_VERIFY_AREA
 216
 217 #define pte_present(x)  (pte_val(x) & _PAGE_VALID)
 218 #define pte_clear(mm, addr, xp)                         \
 219 do {                                                    \
 220         set_pte_at((mm), (addr), (xp), __pte(0));       \
 221 } while (0)
 222
 223 #define pmd_none(x)     (!pmd_val(x))
 224 #define pmd_present(x)  (!pmd_none(x))
 225 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 226 #define pmd_bad(x)      0
 227
 228
 229 #define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
 230
 231 #ifndef __ASSEMBLY__
 232
 233 /*
 234  * The following only work if pte_present() is true.
 235  * Undefined behaviour if not..
 236  */
 237 static inline int pte_user(pte_t pte)   { return pte_val(pte) & __PAGE_PROT_USER; }
 238 static inline int pte_read(pte_t pte)   { return pte_val(pte) & __PAGE_PROT_USER; }
 239 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_DIRTY; }
 240 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 241 static inline int pte_write(pte_t pte)  { return pte_val(pte) & __PAGE_PROT_WRITE; }
 242 static inline int pte_special(pte_t pte){ return 0; }
 243
 244 /*
 245  * The following only works if pte_present() is not true.
 246  */
 247 static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
 248
 249 static inline pte_t pte_rdprotect(pte_t pte)
 250 {
 251         pte_val(pte) &= ~(__PAGE_PROT_USER|__PAGE_PROT_UWAUX); return pte;
 252 }
 253 static inline pte_t pte_exprotect(pte_t pte)
 254 {
 255         pte_val(pte) |= _PAGE_NX; return pte;
 256 }
 257
 258 static inline pte_t pte_wrprotect(pte_t pte)
 259 {
 260         pte_val(pte) &= ~(__PAGE_PROT_WRITE|__PAGE_PROT_UWAUX); return pte;
 261 }
 262
 263 static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 264 static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 265 static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
 266 static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 267 static inline pte_t pte_mkexec(pte_t pte)       { pte_val(pte) &= ~_PAGE_NX; return pte; }
 268
 269 static inline pte_t pte_mkread(pte_t pte)
 270 {
 271         pte_val(pte) |= __PAGE_PROT_USER;
 272         if (pte_write(pte))
 273                 pte_val(pte) |= __PAGE_PROT_UWAUX;
 274         return pte;
 275 }
 276 static inline pte_t pte_mkwrite(pte_t pte)
 277 {
 278         pte_val(pte) |= __PAGE_PROT_WRITE;
 279         if (pte_val(pte) & __PAGE_PROT_USER)
 280                 pte_val(pte) |= __PAGE_PROT_UWAUX;
 281         return pte;
 282 }
 283
 284 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 285
 286 #define pte_ERROR(e) \
 287         printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
 288                __FILE__, __LINE__, pte_val(e))
 289 #define pgd_ERROR(e) \
 290         printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
 291                __FILE__, __LINE__, pgd_val(e))
 292
 293 /*
 294  * The "pgd_xxx()" functions here are trivial for a folded two-level
 295  * setup: the pgd is never bad, and a pmd always exists (as it's folded
 296  * into the pgd entry)
 297  */
 298 #define pgd_clear(xp)                           do { } while (0)
 299
 300 /*
 301  * Certain architectures need to do special things when PTEs
 302  * within a page table are directly modified.  Thus, the following
 303  * hook is made available.
 304  */
 305 #define set_pte(pteptr, pteval)                 (*(pteptr) = pteval)
 306 #define set_pte_at(mm, addr, ptep, pteval)      set_pte((ptep), (pteval))
 307 #define set_pte_atomic(pteptr, pteval)          set_pte((pteptr), (pteval))
 308
 309 /*
 310  * (pmds are folded into pgds so this doesn't get actually called,
 311  * but the define is needed for a generic inline function.)
 312  */
 313 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
 314
 315 #define ptep_get_and_clear(mm, addr, ptep) \
 316         __pte(xchg(&(ptep)->pte, 0))
 317 #define pte_same(a, b)          (pte_val(a) == pte_val(b))
 318 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 319 #define pte_none(x)             (!pte_val(x))
 320 #define pte_pfn(x)              ((unsigned long) (pte_val(x) >> PAGE_SHIFT))
 321 #define __pfn_addr(pfn)         ((pfn) << PAGE_SHIFT)
 322 #define pfn_pte(pfn, prot)      __pte(__pfn_addr(pfn) | pgprot_val(prot))
 323 #define pfn_pmd(pfn, prot)      __pmd(__pfn_addr(pfn) | pgprot_val(prot))
 324
 325 /*
 326  * All present user pages are user-executable:
 327  */
 328 static inline int pte_exec(pte_t pte)
 329 {
 330         return pte_user(pte);
 331 }
 332
 333 /*
 334  * All present pages are kernel-executable:
 335  */
 336 static inline int pte_exec_kernel(pte_t pte)
 337 {
 338         return 1;
 339 }
 340
 341 #define PTE_FILE_MAX_BITS       30
 342
 343 #define pte_to_pgoff(pte)       (pte_val(pte) >> 2)
 344 #define pgoff_to_pte(off)       __pte((off) << 2 | _PAGE_FILE)
 345
 346 /* Encode and de-code a swap entry */
 347 #define __swp_type(x)                   (((x).val >> 2) & 0x3f)
 348 #define __swp_offset(x)                 ((x).val >> 8)
 349 #define __swp_entry(type, offset) \
 350         ((swp_entry_t) { ((type) << 2) | ((offset) << 8) })
 351 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 352 #define __swp_entry_to_pte(x)           __pte((x).val)
 353
 354 static inline
 355 int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr,
 356                               pte_t *ptep)
 357 {
 358         if (!pte_dirty(*ptep))
 359                 return 0;
 360         return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte);
 361 }
 362
 363 static inline
 364 int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
 365                               pte_t *ptep)
 366 {
 367         if (!pte_young(*ptep))
 368                 return 0;
 369         return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
 370 }
 371
 372 static inline
 373 void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 374 {
 375         pte_val(*ptep) &= ~(__PAGE_PROT_WRITE|__PAGE_PROT_UWAUX);
 376 }
 377
 378 static inline void ptep_mkdirty(pte_t *ptep)
 379 {
 380         set_bit(_PAGE_BIT_DIRTY, &ptep->pte);
 381 }
 382
 383 /*
 384  * Macro to mark a page protection value as "uncacheable".  On processors which
 385  * do not support it, this is a no-op.
 386  */
 387 #define pgprot_noncached(prot)  __pgprot(pgprot_val(prot) & ~_PAGE_CACHE)
 388
 389 /*
 390  * Macro to mark a page protection value as "Write-Through".
 391  * On processors which do not support it, this is a no-op.
 392  */
 393 #define pgprot_through(prot)    __pgprot(pgprot_val(prot) | _PAGE_CACHE_WT)
 394
 395 /*
 396  * Conversion functions: convert a page and protection to a page entry,
 397  * and a page entry and page directory to the page they refer to.
 398  */
 399
 400 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 401 #define mk_pte_huge(entry) \
 402         ((entry).pte |= _PAGE_PRESENT | _PAGE_PSE | _PAGE_VALID)
 403
 404 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 405 {
 406         pte_val(pte) &= _PAGE_CHG_MASK;
 407         pte_val(pte) |= pgprot_val(newprot);
 408         return pte;
 409 }
 410
 411 #define page_pte(page)  page_pte_prot((page), __pgprot(0))
 412
 413 #define pmd_page_kernel(pmd) \
 414         ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 415
 416 #define pmd_page(pmd)   pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
 417
 418 #define pmd_large(pmd) \
 419         ((pmd_val(pmd) & (_PAGE_PSE | _PAGE_PRESENT)) == \
 420          (_PAGE_PSE | _PAGE_PRESENT))
 421
 422 /*
 423  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 424  *
 425  * this macro returns the index of the entry in the pgd page which would
 426  * control the given virtual address
 427  */
 428 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 429
 430 /*
 431  * pgd_offset() returns a (pgd_t *)
 432  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 433  */
 434 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 435
 436 /*
 437  * a shortcut which implies the use of the kernel's pgd, instead
 438  * of a process's
 439  */
 440 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 441
 442 /*
 443  * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
 444  *
 445  * this macro returns the index of the entry in the pmd page which would
 446  * control the given virtual address
 447  */
 448 #define pmd_index(address) \
 449         (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 450
 451 /*
 452  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 453  *
 454  * this macro returns the index of the entry in the pte page which would
 455  * control the given virtual address
 456  */
 457 #define pte_index(address) \
 458         (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 459
 460 #define pte_offset_kernel(dir, address) \
 461         ((pte_t *) pmd_page_kernel(*(dir)) +  pte_index(address))
 462
 463 /*
 464  * Make a given kernel text page executable/non-executable.
 465  * Returns the previous executability setting of that page (which
 466  * is used to restore the previous state). Used by the SMP bootup code.
 467  * NOTE: this is an __init function for security reasons.
 468  */
 469 static inline int set_kernel_exec(unsigned long vaddr, int enable)
 470 {
 471         return 0;
 472 }
 473
 474 #define pte_offset_map(dir, address) \
 475         ((pte_t *) page_address(pmd_page(*(dir))) + pte_index(address))
 476 #define pte_unmap(pte)          do {} while (0)
 477
 478 /*
 479  * The MN10300 has external MMU info in the form of a TLB: this is adapted from
 480  * the kernel page tables containing the necessary information by tlb-mn10300.S
 481  */
 482 extern void update_mmu_cache(struct vm_area_struct *vma,
 483                              unsigned long address, pte_t *ptep);
 484
 485 #endif /* !__ASSEMBLY__ */
 486
 487 #define kern_addr_valid(addr)   (1)
 488
 489 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 490 #define GET_IOSPACE(pfn)                0
 491 #define GET_PFN(pfn)                    (pfn)
 492
 493 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 494 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 495 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 496 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 497 #define __HAVE_ARCH_PTEP_MKDIRTY
 498 #define __HAVE_ARCH_PTE_SAME
 499 #include <asm-generic/pgtable.h>
 500
 501 #endif /* !__ASSEMBLY__ */
 502
 503 #endif /* _ASM_PGTABLE_H */