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-generic/5level-fixup.h>
  20 #include <asm/mem-layout.h>
  21 #include <asm/setup.h>
  22 #include <asm/processor.h>
  23
  24 #ifndef __ASSEMBLY__
  25 #include <linux/threads.h>
  26 #include <linux/slab.h>
  27 #include <linux/list.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/sched.h>
  30 struct vm_area_struct;
  31 #endif
  32
  33 #ifndef __ASSEMBLY__
  34 #if defined(CONFIG_HIGHPTE)
  35 typedef unsigned long pte_addr_t;
  36 #else
  37 typedef pte_t *pte_addr_t;
  38 #endif
  39 #endif
  40
  41 /*****************************************************************************/
  42 /*
  43  * MMU-less operation case first
  44  */
  45 #ifndef CONFIG_MMU
  46
  47 #define pgd_present(pgd)        (1)             /* pages are always present on NO_MM */
  48 #define pgd_none(pgd)           (0)
  49 #define pgd_bad(pgd)            (0)
  50 #define pgd_clear(pgdp)
  51 #define kern_addr_valid(addr)   (1)
  52 #define pmd_offset(a, b)        ((void *) 0)
  53
  54 #define PAGE_NONE               __pgprot(0)     /* these mean nothing to NO_MM */
  55 #define PAGE_SHARED             __pgprot(0)     /* these mean nothing to NO_MM */
  56 #define PAGE_COPY               __pgprot(0)     /* these mean nothing to NO_MM */
  57 #define PAGE_READONLY           __pgprot(0)     /* these mean nothing to NO_MM */
  58 #define PAGE_KERNEL             __pgprot(0)     /* these mean nothing to NO_MM */
  59
  60 #define __swp_type(x)           (0)
  61 #define __swp_offset(x)         (0)
  62 #define __swp_entry(typ,off)    ((swp_entry_t) { ((typ) | ((off) << 7)) })
  63 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
  64 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
  65
  66 #define ZERO_PAGE(vaddr)        ({ BUG(); NULL; })
  67
  68 #define swapper_pg_dir          ((pgd_t *) NULL)
  69
  70 #define pgtable_cache_init()            do {} while (0)
  71
  72 #include <asm-generic/pgtable.h>
  73
  74 #else /* !CONFIG_MMU */
  75 /*****************************************************************************/
  76 /*
  77  * then MMU operation
  78  */
  79
  80 /*
  81  * ZERO_PAGE is a global shared page that is always zero: used
  82  * for zero-mapped memory areas etc..
  83  */
  84 #ifndef __ASSEMBLY__
  85 extern unsigned long empty_zero_page;
  86 #define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  87 #endif
  88
  89 /*
  90  * we use 2-level page tables, folding the PMD (mid-level table) into the PGE (top-level entry)
  91  * [see Documentation/frv/mmu-layout.txt]
  92  *
  93  * Page Directory:
  94  *  - Size: 16KB
  95  *  - 64 PGEs per PGD
  96  *  - Each PGE holds 1 PUD and covers 64MB
  97  *
  98  * Page Upper Directory:
  99  *  - Size: 256B
 100  *  - 1 PUE per PUD
 101  *  - Each PUE holds 1 PMD and covers 64MB
 102  *
 103  * Page Mid-Level Directory
 104  *  - Size: 256B
 105  *  - 1 PME per PMD
 106  *  - Each PME holds 64 STEs, all of which point to separate chunks of the same Page Table
 107  *  - All STEs are instantiated at the same time
 108  *
 109  * Page Table
 110  *  - Size: 16KB
 111  *  - 4096 PTEs per PT
 112  *  - Each Linux PT is subdivided into 64 FR451 PT's, each of which holds 64 entries
 113  *
 114  * Pages
 115  *  - Size: 4KB
 116  *
 117  * total PTEs
 118  *      = 1 PML4E * 64 PGEs * 1 PUEs * 1 PMEs * 4096 PTEs
 119  *      = 1 PML4E * 64 PGEs * 64 STEs * 64 PTEs/FR451-PT
 120  *      = 262144 (or 256 * 1024)
 121  */
 122 #define PGDIR_SHIFT             26
 123 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
 124 #define PGDIR_MASK              (~(PGDIR_SIZE - 1))
 125 #define PTRS_PER_PGD            64
 126
 127 #define __PAGETABLE_PUD_FOLDED
 128 #define PUD_SHIFT               26
 129 #define PTRS_PER_PUD            1
 130 #define PUD_SIZE                (1UL << PUD_SHIFT)
 131 #define PUD_MASK                (~(PUD_SIZE - 1))
 132 #define PUE_SIZE                256
 133
 134 #define __PAGETABLE_PMD_FOLDED
 135 #define PMD_SHIFT               26
 136 #define PMD_SIZE                (1UL << PMD_SHIFT)
 137 #define PMD_MASK                (~(PMD_SIZE - 1))
 138 #define PTRS_PER_PMD            1
 139 #define PME_SIZE                256
 140
 141 #define __frv_PT_SIZE           256
 142
 143 #define PTRS_PER_PTE            4096
 144
 145 #define USER_PGDS_IN_LAST_PML4  (TASK_SIZE / PGDIR_SIZE)
 146 #define FIRST_USER_ADDRESS      0UL
 147
 148 #define USER_PGD_PTRS           (PAGE_OFFSET >> PGDIR_SHIFT)
 149 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - USER_PGD_PTRS)
 150
 151 #define TWOLEVEL_PGDIR_SHIFT    26
 152 #define BOOT_USER_PGD_PTRS      (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
 153 #define BOOT_KERNEL_PGD_PTRS    (PTRS_PER_PGD - BOOT_USER_PGD_PTRS)
 154
 155 #ifndef __ASSEMBLY__
 156
 157 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 158
 159 #define pte_ERROR(e) \
 160         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte)
 161 #define pmd_ERROR(e) \
 162         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 163 #define pud_ERROR(e) \
 164         printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pmd_val(pud_val(e)))
 165 #define pgd_ERROR(e) \
 166         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pmd_val(pud_val(pgd_val(e))))
 167
 168 /*
 169  * Certain architectures need to do special things when PTEs
 170  * within a page table are directly modified.  Thus, the following
 171  * hook is made available.
 172  */
 173 #define set_pte(pteptr, pteval)                         \
 174 do {                                                    \
 175         *(pteptr) = (pteval);                           \
 176         asm volatile("dcf %M0" :: "U"(*pteptr));        \
 177 } while(0)
 178 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 179
 180 /*
 181  * pgd_offset() returns a (pgd_t *)
 182  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 183  */
 184 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 185
 186 /*
 187  * a shortcut which implies the use of the kernel's pgd, instead
 188  * of a process's
 189  */
 190 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 191
 192 /*
 193  * The "pgd_xxx()" functions here are trivial for a folded two-level
 194  * setup: the pud is never bad, and a pud always exists (as it's folded
 195  * into the pgd entry)
 196  */
 197 static inline int pgd_none(pgd_t pgd)           { return 0; }
 198 static inline int pgd_bad(pgd_t pgd)            { return 0; }
 199 static inline int pgd_present(pgd_t pgd)        { return 1; }
 200 static inline void pgd_clear(pgd_t *pgd)        { }
 201
 202 #define pgd_populate(mm, pgd, pud)              do { } while (0)
 203 /*
 204  * (puds are folded into pgds so this doesn't get actually called,
 205  * but the define is needed for a generic inline function.)
 206  */
 207 #define set_pgd(pgdptr, pgdval)                         \
 208 do {                                                    \
 209         memcpy((pgdptr), &(pgdval), sizeof(pgd_t));     \
 210         asm volatile("dcf %M0" :: "U"(*(pgdptr)));      \
 211 } while(0)
 212
 213 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
 214 {
 215         return (pud_t *) pgd;
 216 }
 217
 218 #define pgd_page(pgd)                           (pud_page((pud_t){ pgd }))
 219 #define pgd_page_vaddr(pgd)                     (pud_page_vaddr((pud_t){ pgd }))
 220
 221 /*
 222  * allocating and freeing a pud is trivial: the 1-entry pud is
 223  * inside the pgd, so has no extra memory associated with it.
 224  */
 225 #define pud_alloc_one(mm, address)              NULL
 226 #define pud_free(mm, x)                         do { } while (0)
 227 #define __pud_free_tlb(tlb, x, address)         do { } while (0)
 228
 229 /*
 230  * The "pud_xxx()" functions here are trivial for a folded two-level
 231  * setup: the pmd is never bad, and a pmd always exists (as it's folded
 232  * into the pud entry)
 233  */
 234 static inline int pud_none(pud_t pud)           { return 0; }
 235 static inline int pud_bad(pud_t pud)            { return 0; }
 236 static inline int pud_present(pud_t pud)        { return 1; }
 237 static inline void pud_clear(pud_t *pud)        { }
 238
 239 #define pud_populate(mm, pmd, pte)              do { } while (0)
 240
 241 /*
 242  * (pmds are folded into puds so this doesn't get actually called,
 243  * but the define is needed for a generic inline function.)
 244  */
 245 #define set_pud(pudptr, pudval)                 set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
 246
 247 #define pud_page(pud)                           (pmd_page((pmd_t){ pud }))
 248 #define pud_page_vaddr(pud)                     (pmd_page_vaddr((pmd_t){ pud }))
 249
 250 /*
 251  * (pmds are folded into pgds so this doesn't get actually called,
 252  * but the define is needed for a generic inline function.)
 253  */
 254 extern void __set_pmd(pmd_t *pmdptr, unsigned long __pmd);
 255
 256 #define set_pmd(pmdptr, pmdval)                 \
 257 do {                                            \
 258         __set_pmd((pmdptr), (pmdval).ste[0]);   \
 259 } while(0)
 260
 261 #define __pmd_index(address)                    0
 262
 263 static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address)
 264 {
 265         return (pmd_t *) dir + __pmd_index(address);
 266 }
 267
 268 #define pte_same(a, b)          ((a).pte == (b).pte)
 269 #define pte_page(x)             (mem_map + ((unsigned long)(((x).pte >> PAGE_SHIFT))))
 270 #define pte_none(x)             (!(x).pte)
 271 #define pte_pfn(x)              ((unsigned long)(((x).pte >> PAGE_SHIFT)))
 272 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 273 #define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 274
 275 #define VMALLOC_VMADDR(x)       ((unsigned long) (x))
 276
 277 #endif /* !__ASSEMBLY__ */
 278
 279 /*
 280  * control flags in AMPR registers and TLB entries
 281  */
 282 #define _PAGE_BIT_PRESENT       xAMPRx_V_BIT
 283 #define _PAGE_BIT_WP            DAMPRx_WP_BIT
 284 #define _PAGE_BIT_NOCACHE       xAMPRx_C_BIT
 285 #define _PAGE_BIT_SUPER         xAMPRx_S_BIT
 286 #define _PAGE_BIT_ACCESSED      xAMPRx_RESERVED8_BIT
 287 #define _PAGE_BIT_DIRTY         xAMPRx_M_BIT
 288 #define _PAGE_BIT_NOTGLOBAL     xAMPRx_NG_BIT
 289
 290 #define _PAGE_PRESENT           xAMPRx_V
 291 #define _PAGE_WP                DAMPRx_WP
 292 #define _PAGE_NOCACHE           xAMPRx_C
 293 #define _PAGE_SUPER             xAMPRx_S
 294 #define _PAGE_ACCESSED          xAMPRx_RESERVED8        /* accessed if set */
 295 #define _PAGE_DIRTY             xAMPRx_M
 296 #define _PAGE_NOTGLOBAL         xAMPRx_NG
 297
 298 #define _PAGE_RESERVED_MASK     (xAMPRx_RESERVED8 | xAMPRx_RESERVED13)
 299
 300 #define _PAGE_PROTNONE          0x000   /* If not present */
 301
 302 #define _PAGE_CHG_MASK          (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 303
 304 #define __PGPROT_BASE \
 305         (_PAGE_PRESENT | xAMPRx_SS_16Kb | xAMPRx_D | _PAGE_NOTGLOBAL | _PAGE_ACCESSED)
 306
 307 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 308 #define PAGE_SHARED     __pgprot(__PGPROT_BASE)
 309 #define PAGE_COPY       __pgprot(__PGPROT_BASE | _PAGE_WP)
 310 #define PAGE_READONLY   __pgprot(__PGPROT_BASE | _PAGE_WP)
 311
 312 #define __PAGE_KERNEL           (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY)
 313 #define __PAGE_KERNEL_NOCACHE   (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_NOCACHE)
 314 #define __PAGE_KERNEL_RO        (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_WP)
 315
 316 #define MAKE_GLOBAL(x) __pgprot((x) & ~_PAGE_NOTGLOBAL)
 317
 318 #define PAGE_KERNEL             MAKE_GLOBAL(__PAGE_KERNEL)
 319 #define PAGE_KERNEL_RO          MAKE_GLOBAL(__PAGE_KERNEL_RO)
 320 #define PAGE_KERNEL_NOCACHE     MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
 321
 322 #define _PAGE_TABLE             (_PAGE_PRESENT | xAMPRx_SS_16Kb)
 323
 324 #ifndef __ASSEMBLY__
 325
 326 /*
 327  * The FR451 can do execute protection by virtue of having separate TLB miss handlers for
 328  * instruction access and for data access. However, we don't have enough reserved bits to say
 329  * "execute only", so we don't bother. If you can read it, you can execute it and vice versa.
 330  */
 331 #define __P000  PAGE_NONE
 332 #define __P001  PAGE_READONLY
 333 #define __P010  PAGE_COPY
 334 #define __P011  PAGE_COPY
 335 #define __P100  PAGE_READONLY
 336 #define __P101  PAGE_READONLY
 337 #define __P110  PAGE_COPY
 338 #define __P111  PAGE_COPY
 339
 340 #define __S000  PAGE_NONE
 341 #define __S001  PAGE_READONLY
 342 #define __S010  PAGE_SHARED
 343 #define __S011  PAGE_SHARED
 344 #define __S100  PAGE_READONLY
 345 #define __S101  PAGE_READONLY
 346 #define __S110  PAGE_SHARED
 347 #define __S111  PAGE_SHARED
 348
 349 /*
 350  * Define this to warn about kernel memory accesses that are
 351  * done without a 'access_ok(VERIFY_WRITE,..)'
 352  */
 353 #undef TEST_ACCESS_OK
 354
 355 #define pte_present(x)  (pte_val(x) & _PAGE_PRESENT)
 356 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 357
 358 #define pmd_none(x)     (!pmd_val(x))
 359 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 360 #define pmd_bad(x)      (pmd_val(x) & xAMPRx_SS)
 361 #define pmd_clear(xp)   do { __set_pmd(xp, 0); } while(0)
 362
 363 #define pmd_page_vaddr(pmd) \
 364         ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 365
 366 #ifndef CONFIG_DISCONTIGMEM
 367 #define pmd_page(pmd)   (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 368 #endif
 369
 370 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
 371
 372 /*
 373  * The following only work if pte_present() is true.
 374  * Undefined behaviour if not..
 375  */
 376 static inline int pte_dirty(pte_t pte)          { return (pte).pte & _PAGE_DIRTY; }
 377 static inline int pte_young(pte_t pte)          { return (pte).pte & _PAGE_ACCESSED; }
 378 static inline int pte_write(pte_t pte)          { return !((pte).pte & _PAGE_WP); }
 379 static inline int pte_special(pte_t pte)        { return 0; }
 380
 381 static inline pte_t pte_mkclean(pte_t pte)      { (pte).pte &= ~_PAGE_DIRTY; return pte; }
 382 static inline pte_t pte_mkold(pte_t pte)        { (pte).pte &= ~_PAGE_ACCESSED; return pte; }
 383 static inline pte_t pte_wrprotect(pte_t pte)    { (pte).pte |= _PAGE_WP; return pte; }
 384 static inline pte_t pte_mkdirty(pte_t pte)      { (pte).pte |= _PAGE_DIRTY; return pte; }
 385 static inline pte_t pte_mkyoung(pte_t pte)      { (pte).pte |= _PAGE_ACCESSED; return pte; }
 386 static inline pte_t pte_mkwrite(pte_t pte)      { (pte).pte &= ~_PAGE_WP; return pte; }
 387 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 388
 389 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 390 {
 391         int i = test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
 392         asm volatile("dcf %M0" :: "U"(*ptep));
 393         return i;
 394 }
 395
 396 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 397 {
 398         unsigned long x = xchg(&ptep->pte, 0);
 399         asm volatile("dcf %M0" :: "U"(*ptep));
 400         return __pte(x);
 401 }
 402
 403 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 404 {
 405         set_bit(_PAGE_BIT_WP, ptep);
 406         asm volatile("dcf %M0" :: "U"(*ptep));
 407 }
 408
 409 /*
 410  * Macro to mark a page protection value as "uncacheable"
 411  */
 412 #define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE))
 413
 414 /*
 415  * Conversion functions: convert a page and protection to a page entry,
 416  * and a page entry and page directory to the page they refer to.
 417  */
 418
 419 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 420 #define mk_pte_huge(entry)      ((entry).pte_low |= _PAGE_PRESENT | _PAGE_PSE)
 421
 422 /* This takes a physical page address that is used by the remapping functions */
 423 #define mk_pte_phys(physpage, pgprot)   pfn_pte((physpage) >> PAGE_SHIFT, pgprot)
 424
 425 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 426 {
 427         pte.pte &= _PAGE_CHG_MASK;
 428         pte.pte |= pgprot_val(newprot);
 429         return pte;
 430 }
 431
 432 /* to find an entry in a page-table-directory. */
 433 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 434 #define pgd_index_k(addr) pgd_index(addr)
 435
 436 /* Find an entry in the bottom-level page table.. */
 437 #define __pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 438
 439 /*
 440  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 441  *
 442  * this macro returns the index of the entry in the pte page which would
 443  * control the given virtual address
 444  */
 445 #define pte_index(address) \
 446                 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 447 #define pte_offset_kernel(dir, address) \
 448         ((pte_t *) pmd_page_vaddr(*(dir)) +  pte_index(address))
 449
 450 #if defined(CONFIG_HIGHPTE)
 451 #define pte_offset_map(dir, address) \
 452         ((pte_t *)kmap_atomic(pmd_page(*(dir))) + pte_index(address))
 453 #define pte_unmap(pte) kunmap_atomic(pte)
 454 #else
 455 #define pte_offset_map(dir, address) \
 456         ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
 457 #define pte_unmap(pte) do { } while (0)
 458 #endif
 459
 460 /*
 461  * Handle swap and file entries
 462  * - the PTE is encoded in the following format:
 463  *      bit 0:          Must be 0 (!_PAGE_PRESENT)
 464  *      bits 1-6:       Swap type
 465  *      bits 7-31:      Swap offset
 466  */
 467 #define __swp_type(x)                   (((x).val >> 1) & 0x1f)
 468 #define __swp_offset(x)                 ((x).val >> 7)
 469 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 7) })
 470 #define __pte_to_swp_entry(_pte)        ((swp_entry_t) { (_pte).pte })
 471 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 472
 473 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 474 #define PageSkip(page)          (0)
 475 #define kern_addr_valid(addr)   (1)
 476
 477 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 478 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 479 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 480 #define __HAVE_ARCH_PTE_SAME
 481 #include <asm-generic/pgtable.h>
 482
 483 /*
 484  * preload information about a newly instantiated PTE into the SCR0/SCR1 PGE cache
 485  */
 486 static inline void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
 487 {
 488         struct mm_struct *mm;
 489         unsigned long ampr;
 490
 491         mm = current->mm;
 492         if (mm) {
 493                 pgd_t *pge = pgd_offset(mm, address);
 494                 pud_t *pue = pud_offset(pge, address);
 495                 pmd_t *pme = pmd_offset(pue, address);
 496
 497                 ampr = pme->ste[0] & 0xffffff00;
 498                 ampr |= xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C |
 499                         xAMPRx_V;
 500         } else {
 501                 address = ULONG_MAX;
 502                 ampr = 0;
 503         }
 504
 505         asm volatile("movgs %0,scr0\n"
 506                      "movgs %0,scr1\n"
 507                      "movgs %1,dampr4\n"
 508                      "movgs %1,dampr5\n"
 509                      :
 510                      : "r"(address), "r"(ampr)
 511                      );
 512 }
 513
 514 #ifdef CONFIG_PROC_FS
 515 extern char *proc_pid_status_frv_cxnr(struct mm_struct *mm, char *buffer);
 516 #endif
 517
 518 extern void __init pgtable_cache_init(void);
 519
 520 #endif /* !__ASSEMBLY__ */
 521 #endif /* !CONFIG_MMU */
 522
 523 #ifndef __ASSEMBLY__
 524 extern void __init paging_init(void);
 525 #endif /* !__ASSEMBLY__ */
 526 #define HAVE_ARCH_UNMAPPED_AREA
 527
 528 #endif /* _ASM_PGTABLE_H */