arch/frv/include/asm/pgtable.h

   1 /* pgtable.h: FR-V page table mangling
   2  *
   3  * Copyright (C) 2004 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 License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  * Derived from:
  12  *      include/asm-m68knommu/pgtable.h
  13  *      include/asm-i386/pgtable.h
  14  */
  15
  16 #ifndef _ASM_PGTABLE_H
  17 #define _ASM_PGTABLE_H
  18
  19 #include <asm/mem-layout.h>
  20 #include <asm/setup.h>
  21 #include <asm/processor.h>
  22
  23 #ifndef __ASSEMBLY__
  24 #include <linux/threads.h>
  25 #include <linux/slab.h>
  26 #include <linux/list.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/sched.h>
  29 struct vm_area_struct;
  30 #endif
  31
  32 #ifndef __ASSEMBLY__
  33 #if defined(CONFIG_HIGHPTE)
  34 typedef unsigned long pte_addr_t;
  35 #else
  36 typedef pte_t *pte_addr_t;
  37 #endif
  38 #endif
  39
  40 /*****************************************************************************/
  41 /*
  42  * MMU-less operation case first
  43  */
  44 #ifndef CONFIG_MMU
  45
  46 #define pgd_present(pgd)        (1)             /* pages are always present on NO_MM */
  47 #define pgd_none(pgd)           (0)
  48 #define pgd_bad(pgd)            (0)
  49 #define pgd_clear(pgdp)
  50 #define kern_addr_valid(addr)   (1)
  51 #define pmd_offset(a, b)        ((void *) 0)
  52
  53 #define PAGE_NONE               __pgprot(0)     /* these mean nothing to NO_MM */
  54 #define PAGE_SHARED             __pgprot(0)     /* these mean nothing to NO_MM */
  55 #define PAGE_COPY               __pgprot(0)     /* these mean nothing to NO_MM */
  56 #define PAGE_READONLY           __pgprot(0)     /* these mean nothing to NO_MM */
  57 #define PAGE_KERNEL             __pgprot(0)     /* these mean nothing to NO_MM */
  58
  59 #define __swp_type(x)           (0)
  60 #define __swp_offset(x)         (0)
  61 #define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  62 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  63 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  64
  65 #define ZERO_PAGE(vaddr)        ({ BUG(); NULL; })
  66
  67 #define swapper_pg_dir          ((pgd_t *) NULL)
  68
  69 #define pgtable_cache_init()            do {} while (0)
  70
  71 #include <asm-generic/pgtable.h>
  72
  73 #else /* !CONFIG_MMU */
  74 /*****************************************************************************/
  75 /*
  76  * then MMU operation
  77  */
  78
  79 /*
  80  * ZERO_PAGE is a global shared page that is always zero: used
  81  * for zero-mapped memory areas etc..
  82  */
  83 #ifndef __ASSEMBLY__
  84 extern unsigned long empty_zero_page;
  85 #define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  86 #endif
  87
  88 /*
  89  * we use 2-level page tables, folding the PMD (mid-level table) into the PGE (top-level entry)
  90  * [see Documentation/frv/mmu-layout.txt]
  91  *
  92  * Page Directory:
  93  *  - Size: 16KB
  94  *  - 64 PGEs per PGD
  95  *  - Each PGE holds 1 PUD and covers 64MB
  96  *
  97  * Page Upper Directory:
  98  *  - Size: 256B
  99  *  - 1 PUE per PUD
 100  *  - Each PUE holds 1 PMD and covers 64MB
 101  *
 102  * Page Mid-Level Directory
 103  *  - Size: 256B
 104  *  - 1 PME per PMD
 105  *  - Each PME holds 64 STEs, all of which point to separate chunks of the same Page Table
 106  *  - All STEs are instantiated at the same time
 107  *
 108  * Page Table
 109  *  - Size: 16KB
 110  *  - 4096 PTEs per PT
 111  *  - Each Linux PT is subdivided into 64 FR451 PT's, each of which holds 64 entries
 112  *
 113  * Pages
 114  *  - Size: 4KB
 115  *
 116  * total PTEs
 117  *      = 1 PML4E * 64 PGEs * 1 PUEs * 1 PMEs * 4096 PTEs
 118  *      = 1 PML4E * 64 PGEs * 64 STEs * 64 PTEs/FR451-PT
 119  *      = 262144 (or 256 * 1024)
 120  */
 121 #define PGDIR_SHIFT             26
 122 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
 123 #define PGDIR_MASK              (~(PGDIR_SIZE - 1))
 124 #define PTRS_PER_PGD            64
 125
 126 #define PUD_SHIFT               26
 127 #define PTRS_PER_PUD            1
 128 #define PUD_SIZE                (1UL << PUD_SHIFT)
 129 #define PUD_MASK                (~(PUD_SIZE - 1))
 130 #define PUE_SIZE                256
 131
 132 #define PMD_SHIFT               26
 133 #define PMD_SIZE                (1UL << PMD_SHIFT)
 134 #define PMD_MASK                (~(PMD_SIZE - 1))
 135 #define PTRS_PER_PMD            1
 136 #define PME_SIZE                256
 137
 138 #define __frv_PT_SIZE           256
 139
 140 #define PTRS_PER_PTE            4096
 141
 142 #define USER_PGDS_IN_LAST_PML4  (TASK_SIZE / PGDIR_SIZE)
 143 #define FIRST_USER_ADDRESS      0UL
 144
 145 #define USER_PGD_PTRS           (PAGE_OFFSET >> PGDIR_SHIFT)
 146 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - USER_PGD_PTRS)
 147
 148 #define TWOLEVEL_PGDIR_SHIFT    26
 149 #define BOOT_USER_PGD_PTRS      (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
 150 #define BOOT_KERNEL_PGD_PTRS    (PTRS_PER_PGD - BOOT_USER_PGD_PTRS)
 151
 152 #ifndef __ASSEMBLY__
 153
 154 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 155
 156 #define pte_ERROR(e) \
 157         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte)
 158 #define pmd_ERROR(e) \
 159         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 160 #define pud_ERROR(e) \
 161         printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pmd_val(pud_val(e)))
 162 #define pgd_ERROR(e) \
 163         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pmd_val(pud_val(pgd_val(e))))
 164
 165 /*
 166  * Certain architectures need to do special things when PTEs
 167  * within a page table are directly modified.  Thus, the following
 168  * hook is made available.
 169  */
 170 #define set_pte(pteptr, pteval)                         \
 171 do {                                                    \
 172         *(pteptr) = (pteval);                           \
 173         asm volatile("dcf %M0" :: "U"(*pteptr));        \
 174 } while(0)
 175 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 176
 177 /*
 178  * pgd_offset() returns a (pgd_t *)
 179  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 180  */
 181 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 182
 183 /*
 184  * a shortcut which implies the use of the kernel's pgd, instead
 185  * of a process's
 186  */
 187 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 188
 189 /*
 190  * The "pgd_xxx()" functions here are trivial for a folded two-level
 191  * setup: the pud is never bad, and a pud always exists (as it's folded
 192  * into the pgd entry)
 193  */
 194 static inline int pgd_none(pgd_t pgd)           { return 0; }
 195 static inline int pgd_bad(pgd_t pgd)            { return 0; }
 196 static inline int pgd_present(pgd_t pgd)        { return 1; }
 197 static inline void pgd_clear(pgd_t *pgd)        { }
 198
 199 #define pgd_populate(mm, pgd, pud)              do { } while (0)
 200 /*
 201  * (puds are folded into pgds so this doesn't get actually called,
 202  * but the define is needed for a generic inline function.)
 203  */
 204 #define set_pgd(pgdptr, pgdval)                         \
 205 do {                                                    \
 206         memcpy((pgdptr), &(pgdval), sizeof(pgd_t));     \
 207         asm volatile("dcf %M0" :: "U"(*(pgdptr)));      \
 208 } while(0)
 209
 210 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
 211 {
 212         return (pud_t *) pgd;
 213 }
 214
 215 #define pgd_page(pgd)                           (pud_page((pud_t){ pgd }))
 216 #define pgd_page_vaddr(pgd)                     (pud_page_vaddr((pud_t){ pgd }))
 217
 218 /*
 219  * allocating and freeing a pud is trivial: the 1-entry pud is
 220  * inside the pgd, so has no extra memory associated with it.
 221  */
 222 #define pud_alloc_one(mm, address)              NULL
 223 #define pud_free(mm, x)                         do { } while (0)
 224 #define __pud_free_tlb(tlb, x, address)         do { } while (0)
 225
 226 /*
 227  * The "pud_xxx()" functions here are trivial for a folded two-level
 228  * setup: the pmd is never bad, and a pmd always exists (as it's folded
 229  * into the pud entry)
 230  */
 231 static inline int pud_none(pud_t pud)           { return 0; }
 232 static inline int pud_bad(pud_t pud)            { return 0; }
 233 static inline int pud_present(pud_t pud)        { return 1; }
 234 static inline void pud_clear(pud_t *pud)        { }
 235
 236 #define pud_populate(mm, pmd, pte)              do { } while (0)
 237
 238 /*
 239  * (pmds are folded into puds so this doesn't get actually called,
 240  * but the define is needed for a generic inline function.)
 241  */
 242 #define set_pud(pudptr, pudval)                 set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
 243
 244 #define pud_page(pud)                           (pmd_page((pmd_t){ pud }))
 245 #define pud_page_vaddr(pud)                     (pmd_page_vaddr((pmd_t){ pud }))
 246
 247 /*
 248  * (pmds are folded into pgds so this doesn't get actually called,
 249  * but the define is needed for a generic inline function.)
 250  */
 251 extern void __set_pmd(pmd_t *pmdptr, unsigned long __pmd);
 252
 253 #define set_pmd(pmdptr, pmdval)                 \
 254 do {                                            \
 255         __set_pmd((pmdptr), (pmdval).ste[0]);   \
 256 } while(0)
 257
 258 #define __pmd_index(address)                    0
 259
 260 static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address)
 261 {
 262         return (pmd_t *) dir + __pmd_index(address);
 263 }
 264
 265 #define pte_same(a, b)          ((a).pte == (b).pte)
 266 #define pte_page(x)             (mem_map + ((unsigned long)(((x).pte >> PAGE_SHIFT))))
 267 #define pte_none(x)             (!(x).pte)
 268 #define pte_pfn(x)              ((unsigned long)(((x).pte >> PAGE_SHIFT)))
 269 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 270 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 271
 272 #define VMALLOC_VMADDR(x)       ((unsigned long) (x))
 273
 274 #endif /* !__ASSEMBLY__ */
 275
 276 /*
 277  * control flags in AMPR registers and TLB entries
 278  */
 279 #define _PAGE_BIT_PRESENT       xAMPRx_V_BIT
 280 #define _PAGE_BIT_WP            DAMPRx_WP_BIT
 281 #define _PAGE_BIT_NOCACHE       xAMPRx_C_BIT
 282 #define _PAGE_BIT_SUPER         xAMPRx_S_BIT
 283 #define _PAGE_BIT_ACCESSED      xAMPRx_RESERVED8_BIT
 284 #define _PAGE_BIT_DIRTY         xAMPRx_M_BIT
 285 #define _PAGE_BIT_NOTGLOBAL     xAMPRx_NG_BIT
 286
 287 #define _PAGE_PRESENT           xAMPRx_V
 288 #define _PAGE_WP                DAMPRx_WP
 289 #define _PAGE_NOCACHE           xAMPRx_C
 290 #define _PAGE_SUPER             xAMPRx_S
 291 #define _PAGE_ACCESSED          xAMPRx_RESERVED8        /* accessed if set */
 292 #define _PAGE_DIRTY             xAMPRx_M
 293 #define _PAGE_NOTGLOBAL         xAMPRx_NG
 294
 295 #define _PAGE_RESERVED_MASK     (xAMPRx_RESERVED8 | xAMPRx_RESERVED13)
 296
 297 #define _PAGE_PROTNONE          0x000   /* If not present */
 298
 299 #define _PAGE_CHG_MASK          (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 300
 301 #define __PGPROT_BASE \
 302         (_PAGE_PRESENT | xAMPRx_SS_16Kb | xAMPRx_D | _PAGE_NOTGLOBAL | _PAGE_ACCESSED)
 303
 304 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 305 #define PAGE_SHARED     __pgprot(__PGPROT_BASE)
 306 #define PAGE_COPY       __pgprot(__PGPROT_BASE | _PAGE_WP)
 307 #define PAGE_READONLY   __pgprot(__PGPROT_BASE | _PAGE_WP)
 308
 309 #define __PAGE_KERNEL           (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY)
 310 #define __PAGE_KERNEL_NOCACHE   (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_NOCACHE)
 311 #define __PAGE_KERNEL_RO        (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_WP)
 312
 313 #define MAKE_GLOBAL(x) __pgprot((x) & ~_PAGE_NOTGLOBAL)
 314
 315 #define PAGE_KERNEL             MAKE_GLOBAL(__PAGE_KERNEL)
 316 #define PAGE_KERNEL_RO          MAKE_GLOBAL(__PAGE_KERNEL_RO)
 317 #define PAGE_KERNEL_NOCACHE     MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
 318
 319 #define _PAGE_TABLE             (_PAGE_PRESENT | xAMPRx_SS_16Kb)
 320
 321 #ifndef __ASSEMBLY__
 322
 323 /*
 324  * The FR451 can do execute protection by virtue of having separate TLB miss handlers for
 325  * instruction access and for data access. However, we don't have enough reserved bits to say
 326  * "execute only", so we don't bother. If you can read it, you can execute it and vice versa.
 327  */
 328 #define __P000  PAGE_NONE
 329 #define __P001  PAGE_READONLY
 330 #define __P010  PAGE_COPY
 331 #define __P011  PAGE_COPY
 332 #define __P100  PAGE_READONLY
 333 #define __P101  PAGE_READONLY
 334 #define __P110  PAGE_COPY
 335 #define __P111  PAGE_COPY
 336
 337 #define __S000  PAGE_NONE
 338 #define __S001  PAGE_READONLY
 339 #define __S010  PAGE_SHARED
 340 #define __S011  PAGE_SHARED
 341 #define __S100  PAGE_READONLY
 342 #define __S101  PAGE_READONLY
 343 #define __S110  PAGE_SHARED
 344 #define __S111  PAGE_SHARED
 345
 346 /*
 347  * Define this to warn about kernel memory accesses that are
 348  * done without a 'access_ok(VERIFY_WRITE,..)'
 349  */
 350 #undef TEST_ACCESS_OK
 351
 352 #define pte_present(x)  (pte_val(x) & _PAGE_PRESENT)
 353 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 354
 355 #define pmd_none(x)     (!pmd_val(x))
 356 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 357 #define pmd_bad(x)      (pmd_val(x) & xAMPRx_SS)
 358 #define pmd_clear(xp)   do { __set_pmd(xp, 0); } while(0)
 359
 360 #define pmd_page_vaddr(pmd) \
 361         ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 362
 363 #ifndef CONFIG_DISCONTIGMEM
 364 #define pmd_page(pmd)   (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 365 #endif
 366
 367 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
 368
 369 /*
 370  * The following only work if pte_present() is true.
 371  * Undefined behaviour if not..
 372  */
 373 static inline int pte_dirty(pte_t pte)          { return (pte).pte & _PAGE_DIRTY; }
 374 static inline int pte_young(pte_t pte)          { return (pte).pte & _PAGE_ACCESSED; }
 375 static inline int pte_write(pte_t pte)          { return !((pte).pte & _PAGE_WP); }
 376 static inline int pte_special(pte_t pte)        { return 0; }
 377
 378 static inline pte_t pte_mkclean(pte_t pte)      { (pte).pte &= ~_PAGE_DIRTY; return pte; }
 379 static inline pte_t pte_mkold(pte_t pte)        { (pte).pte &= ~_PAGE_ACCESSED; return pte; }
 380 static inline pte_t pte_wrprotect(pte_t pte)    { (pte).pte |= _PAGE_WP; return pte; }
 381 static inline pte_t pte_mkdirty(pte_t pte)      { (pte).pte |= _PAGE_DIRTY; return pte; }
 382 static inline pte_t pte_mkyoung(pte_t pte)      { (pte).pte |= _PAGE_ACCESSED; return pte; }
 383 static inline pte_t pte_mkwrite(pte_t pte)      { (pte).pte &= ~_PAGE_WP; return pte; }
 384 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 385
 386 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 387 {
 388         int i = test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
 389         asm volatile("dcf %M0" :: "U"(*ptep));
 390         return i;
 391 }
 392
 393 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 394 {
 395         unsigned long x = xchg(&ptep->pte, 0);
 396         asm volatile("dcf %M0" :: "U"(*ptep));
 397         return __pte(x);
 398 }
 399
 400 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 401 {
 402         set_bit(_PAGE_BIT_WP, ptep);
 403         asm volatile("dcf %M0" :: "U"(*ptep));
 404 }
 405
 406 /*
 407  * Macro to mark a page protection value as "uncacheable"
 408  */
 409 #define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE))
 410
 411 /*
 412  * Conversion functions: convert a page and protection to a page entry,
 413  * and a page entry and page directory to the page they refer to.
 414  */
 415
 416 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 417 #define mk_pte_huge(entry)      ((entry).pte_low |= _PAGE_PRESENT | _PAGE_PSE)
 418
 419 /* This takes a physical page address that is used by the remapping functions */
 420 #define mk_pte_phys(physpage, pgprot)   pfn_pte((physpage) >> PAGE_SHIFT, pgprot)
 421
 422 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 423 {
 424         pte.pte &= _PAGE_CHG_MASK;
 425         pte.pte |= pgprot_val(newprot);
 426         return pte;
 427 }
 428
 429 /* to find an entry in a page-table-directory. */
 430 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 431 #define pgd_index_k(addr) pgd_index(addr)
 432
 433 /* Find an entry in the bottom-level page table.. */
 434 #define __pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 435
 436 /*
 437  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 438  *
 439  * this macro returns the index of the entry in the pte page which would
 440  * control the given virtual address
 441  */
 442 #define pte_index(address) \
 443                 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 444 #define pte_offset_kernel(dir, address) \
 445         ((pte_t *) pmd_page_vaddr(*(dir)) +  pte_index(address))
 446
 447 #if defined(CONFIG_HIGHPTE)
 448 #define pte_offset_map(dir, address) \
 449         ((pte_t *)kmap_atomic(pmd_page(*(dir))) + pte_index(address))
 450 #define pte_unmap(pte) kunmap_atomic(pte)
 451 #else
 452 #define pte_offset_map(dir, address) \
 453         ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
 454 #define pte_unmap(pte) do { } while (0)
 455 #endif
 456
 457 /*
 458  * Handle swap and file entries
 459  * - the PTE is encoded in the following format:
 460  *      bit 0:          Must be 0 (!_PAGE_PRESENT)
 461  *      bits 1-6:       Swap type
 462  *      bits 7-31:      Swap offset
 463  */
 464 #define __swp_type(x)                   (((x).val >> 1) & 0x1f)
 465 #define __swp_offset(x)                 ((x).val >> 7)
 466 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 7) })
 467 #define __pte_to_swp_entry(_pte)        ((swp_entry_t) { (_pte).pte })
 468 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 469
 470 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 471 #define PageSkip(page)          (0)
 472 #define kern_addr_valid(addr)   (1)
 473
 474 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 475 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 476 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 477 #define __HAVE_ARCH_PTE_SAME
 478 #include <asm-generic/pgtable.h>
 479
 480 /*
 481  * preload information about a newly instantiated PTE into the SCR0/SCR1 PGE cache
 482  */
 483 static inline void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
 484 {
 485         struct mm_struct *mm;
 486         unsigned long ampr;
 487
 488         mm = current->mm;
 489         if (mm) {
 490                 pgd_t *pge = pgd_offset(mm, address);
 491                 pud_t *pue = pud_offset(pge, address);
 492                 pmd_t *pme = pmd_offset(pue, address);
 493
 494                 ampr = pme->ste[0] & 0xffffff00;
 495                 ampr |= xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C |
 496                         xAMPRx_V;
 497         } else {
 498                 address = ULONG_MAX;
 499                 ampr = 0;
 500         }
 501
 502         asm volatile("movgs %0,scr0\n"
 503                      "movgs %0,scr1\n"
 504                      "movgs %1,dampr4\n"
 505                      "movgs %1,dampr5\n"
 506                      :
 507                      : "r"(address), "r"(ampr)
 508                      );
 509 }
 510
 511 #ifdef CONFIG_PROC_FS
 512 extern char *proc_pid_status_frv_cxnr(struct mm_struct *mm, char *buffer);
 513 #endif
 514
 515 extern void __init pgtable_cache_init(void);
 516
 517 #endif /* !__ASSEMBLY__ */
 518 #endif /* !CONFIG_MMU */
 519
 520 #ifndef __ASSEMBLY__
 521 extern void __init paging_init(void);
 522 #endif /* !__ASSEMBLY__ */
 523
 524 #endif /* _ASM_PGTABLE_H */