LXR linux/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>
  29struct vm_area_struct;
  30#endif
  31
  32#ifndef __ASSEMBLY__
  33#if defined(CONFIG_HIGHPTE)
  34typedef unsigned long pte_addr_t;
  35#else
  36typedef 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#ifndef __ASSEMBLY__
  66static inline int pte_file(pte_t pte) { return 0; }
  67#endif
  68
  69#define ZERO_PAGE(vaddr)        ({ BUG(); NULL; })
  70
  71#define swapper_pg_dir          ((pgd_t *) NULL)
  72
  73#define pgtable_cache_init()            do {} while (0)
  74
  75#include <asm-generic/pgtable.h>
  76
  77#else /* !CONFIG_MMU */
  78/*****************************************************************************/
  79/*
  80 * then MMU operation
  81 */
  82
  83/*
  84 * ZERO_PAGE is a global shared page that is always zero: used
  85 * for zero-mapped memory areas etc..
  86 */
  87#ifndef __ASSEMBLY__
  88extern unsigned long empty_zero_page;
  89#define ZERO_PAGE(vaddr)        virt_to_page(empty_zero_page)
  90#endif
  91
  92/*
  93 * we use 2-level page tables, folding the PMD (mid-level table) into the PGE (top-level entry)
  94 * [see Documentation/frv/mmu-layout.txt]
  95 *
  96 * Page Directory:
  97 *  - Size: 16KB
  98 *  - 64 PGEs per PGD
  99 *  - Each PGE holds 1 PUD and covers 64MB
 100 *
 101 * Page Upper Directory:
 102 *  - Size: 256B
 103 *  - 1 PUE per PUD
 104 *  - Each PUE holds 1 PMD and covers 64MB
 105 *
 106 * Page Mid-Level Directory
 107 *  - Size: 256B
 108 *  - 1 PME per PMD
 109 *  - Each PME holds 64 STEs, all of which point to separate chunks of the same Page Table
 110 *  - All STEs are instantiated at the same time
 111 *
 112 * Page Table
 113 *  - Size: 16KB
 114 *  - 4096 PTEs per PT
 115 *  - Each Linux PT is subdivided into 64 FR451 PT's, each of which holds 64 entries
 116 *
 117 * Pages
 118 *  - Size: 4KB
 119 *
 120 * total PTEs
 121 *      = 1 PML4E * 64 PGEs * 1 PUEs * 1 PMEs * 4096 PTEs
 122 *      = 1 PML4E * 64 PGEs * 64 STEs * 64 PTEs/FR451-PT
 123 *      = 262144 (or 256 * 1024)
 124 */
 125#define PGDIR_SHIFT             26
 126#define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
 127#define PGDIR_MASK              (~(PGDIR_SIZE - 1))
 128#define PTRS_PER_PGD            64
 129
 130#define PUD_SHIFT               26
 131#define PTRS_PER_PUD            1
 132#define PUD_SIZE                (1UL << PUD_SHIFT)
 133#define PUD_MASK                (~(PUD_SIZE - 1))
 134#define PUE_SIZE                256
 135
 136#define PMD_SHIFT               26
 137#define PMD_SIZE                (1UL << PMD_SHIFT)
 138#define PMD_MASK                (~(PMD_SIZE - 1))
 139#define PTRS_PER_PMD            1
 140#define PME_SIZE                256
 141
 142#define __frv_PT_SIZE           256
 143
 144#define PTRS_PER_PTE            4096
 145
 146#define USER_PGDS_IN_LAST_PML4  (TASK_SIZE / PGDIR_SIZE)
 147#define FIRST_USER_ADDRESS      0
 148
 149#define USER_PGD_PTRS           (PAGE_OFFSET >> PGDIR_SHIFT)
 150#define KERNEL_PGD_PTRS         (PTRS_PER_PGD - USER_PGD_PTRS)
 151
 152#define TWOLEVEL_PGDIR_SHIFT    26
 153#define BOOT_USER_PGD_PTRS      (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
 154#define BOOT_KERNEL_PGD_PTRS    (PTRS_PER_PGD - BOOT_USER_PGD_PTRS)
 155
 156#ifndef __ASSEMBLY__
 157
 158extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 159
 160#define pte_ERROR(e) \
 161        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte)
 162#define pmd_ERROR(e) \
 163        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 164#define pud_ERROR(e) \
 165        printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pmd_val(pud_val(e)))
 166#define pgd_ERROR(e) \
 167        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pmd_val(pud_val(pgd_val(e))))
 168
 169/*
 170 * Certain architectures need to do special things when PTEs
 171 * within a page table are directly modified.  Thus, the following
 172 * hook is made available.
 173 */
 174#define set_pte(pteptr, pteval)                         \
 175do {                                                    \
 176        *(pteptr) = (pteval);                           \
 177        asm volatile("dcf %M0" :: "U"(*pteptr));        \
 178} while(0)
 179#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 180
 181/*
 182 * pgd_offset() returns a (pgd_t *)
 183 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 184 */
 185#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 186
 187/*
 188 * a shortcut which implies the use of the kernel's pgd, instead
 189 * of a process's
 190 */
 191#define pgd_offset_k(address) pgd_offset(&init_mm, address)
 192
 193/*
 194 * The "pgd_xxx()" functions here are trivial for a folded two-level
 195 * setup: the pud is never bad, and a pud always exists (as it's folded
 196 * into the pgd entry)
 197 */
 198static inline int pgd_none(pgd_t pgd)           { return 0; }
 199static inline int pgd_bad(pgd_t pgd)            { return 0; }
 200static inline int pgd_present(pgd_t pgd)        { return 1; }
 201static inline void pgd_clear(pgd_t *pgd)        { }
 202
 203#define pgd_populate(mm, pgd, pud)              do { } while (0)
 204/*
 205 * (puds are folded into pgds so this doesn't get actually called,
 206 * but the define is needed for a generic inline function.)
 207 */
 208#define set_pgd(pgdptr, pgdval)                         \
 209do {                                                    \
 210        memcpy((pgdptr), &(pgdval), sizeof(pgd_t));     \
 211        asm volatile("dcf %M0" :: "U"(*(pgdptr)));      \
 212} while(0)
 213
 214static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
 215{
 216        return (pud_t *) pgd;
 217}
 218
 219#define pgd_page(pgd)                           (pud_page((pud_t){ pgd }))
 220#define pgd_page_vaddr(pgd)                     (pud_page_vaddr((pud_t){ pgd }))
 221
 222/*
 223 * allocating and freeing a pud is trivial: the 1-entry pud is
 224 * inside the pgd, so has no extra memory associated with it.
 225 */
 226#define pud_alloc_one(mm, address)              NULL
 227#define pud_free(mm, x)                         do { } while (0)
 228#define __pud_free_tlb(tlb, x, address)         do { } while (0)
 229
 230/*
 231 * The "pud_xxx()" functions here are trivial for a folded two-level
 232 * setup: the pmd is never bad, and a pmd always exists (as it's folded
 233 * into the pud entry)
 234 */
 235static inline int pud_none(pud_t pud)           { return 0; }
 236static inline int pud_bad(pud_t pud)            { return 0; }
 237static inline int pud_present(pud_t pud)        { return 1; }
 238static inline void pud_clear(pud_t *pud)        { }
 239
 240#define pud_populate(mm, pmd, pte)              do { } while (0)
 241
 242/*
 243 * (pmds are folded into puds so this doesn't get actually called,
 244 * but the define is needed for a generic inline function.)
 245 */
 246#define set_pud(pudptr, pudval)                 set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
 247
 248#define pud_page(pud)                           (pmd_page((pmd_t){ pud }))
 249#define pud_page_vaddr(pud)                     (pmd_page_vaddr((pmd_t){ pud }))
 250
 251/*
 252 * (pmds are folded into pgds so this doesn't get actually called,
 253 * but the define is needed for a generic inline function.)
 254 */
 255extern void __set_pmd(pmd_t *pmdptr, unsigned long __pmd);
 256
 257#define set_pmd(pmdptr, pmdval)                 \
 258do {                                            \
 259        __set_pmd((pmdptr), (pmdval).ste[0]);   \
 260} while(0)
 261
 262#define __pmd_index(address)                    0
 263
 264static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address)
 265{
 266        return (pmd_t *) dir + __pmd_index(address);
 267}
 268
 269#define pte_same(a, b)          ((a).pte == (b).pte)
 270#define pte_page(x)             (mem_map + ((unsigned long)(((x).pte >> PAGE_SHIFT))))
 271#define pte_none(x)             (!(x).pte)
 272#define pte_pfn(x)              ((unsigned long)(((x).pte >> PAGE_SHIFT)))
 273#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 274#define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 275
 276#define VMALLOC_VMADDR(x)       ((unsigned long) (x))
 277
 278#endif /* !__ASSEMBLY__ */
 279
 280/*
 281 * control flags in AMPR registers and TLB entries
 282 */
 283#define _PAGE_BIT_PRESENT       xAMPRx_V_BIT
 284#define _PAGE_BIT_WP            DAMPRx_WP_BIT
 285#define _PAGE_BIT_NOCACHE       xAMPRx_C_BIT
 286#define _PAGE_BIT_SUPER         xAMPRx_S_BIT
 287#define _PAGE_BIT_ACCESSED      xAMPRx_RESERVED8_BIT
 288#define _PAGE_BIT_DIRTY         xAMPRx_M_BIT
 289#define _PAGE_BIT_NOTGLOBAL     xAMPRx_NG_BIT
 290
 291#define _PAGE_PRESENT           xAMPRx_V
 292#define _PAGE_WP                DAMPRx_WP
 293#define _PAGE_NOCACHE           xAMPRx_C
 294#define _PAGE_SUPER             xAMPRx_S
 295#define _PAGE_ACCESSED          xAMPRx_RESERVED8        /* accessed if set */
 296#define _PAGE_DIRTY             xAMPRx_M
 297#define _PAGE_NOTGLOBAL         xAMPRx_NG
 298
 299#define _PAGE_RESERVED_MASK     (xAMPRx_RESERVED8 | xAMPRx_RESERVED13)
 300
 301#define _PAGE_FILE              0x002   /* set:pagecache unset:swap */
 302#define _PAGE_PROTNONE          0x000   /* If not present */
 303
 304#define _PAGE_CHG_MASK          (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 305
 306#define __PGPROT_BASE \
 307        (_PAGE_PRESENT | xAMPRx_SS_16Kb | xAMPRx_D | _PAGE_NOTGLOBAL | _PAGE_ACCESSED)
 308
 309#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 310#define PAGE_SHARED     __pgprot(__PGPROT_BASE)
 311#define PAGE_COPY       __pgprot(__PGPROT_BASE | _PAGE_WP)
 312#define PAGE_READONLY   __pgprot(__PGPROT_BASE | _PAGE_WP)
 313
 314#define __PAGE_KERNEL           (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY)
 315#define __PAGE_KERNEL_NOCACHE   (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_NOCACHE)
 316#define __PAGE_KERNEL_RO        (__PGPROT_BASE | _PAGE_SUPER | _PAGE_DIRTY | _PAGE_WP)
 317
 318#define MAKE_GLOBAL(x) __pgprot((x) & ~_PAGE_NOTGLOBAL)
 319
 320#define PAGE_KERNEL             MAKE_GLOBAL(__PAGE_KERNEL)
 321#define PAGE_KERNEL_RO          MAKE_GLOBAL(__PAGE_KERNEL_RO)
 322#define PAGE_KERNEL_NOCACHE     MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
 323
 324#define _PAGE_TABLE             (_PAGE_PRESENT | xAMPRx_SS_16Kb)
 325
 326#ifndef __ASSEMBLY__
 327
 328/*
 329 * The FR451 can do execute protection by virtue of having separate TLB miss handlers for
 330 * instruction access and for data access. However, we don't have enough reserved bits to say
 331 * "execute only", so we don't bother. If you can read it, you can execute it and vice versa.
 332 */
 333#define __P000  PAGE_NONE
 334#define __P001  PAGE_READONLY
 335#define __P010  PAGE_COPY
 336#define __P011  PAGE_COPY
 337#define __P100  PAGE_READONLY
 338#define __P101  PAGE_READONLY
 339#define __P110  PAGE_COPY
 340#define __P111  PAGE_COPY
 341
 342#define __S000  PAGE_NONE
 343#define __S001  PAGE_READONLY
 344#define __S010  PAGE_SHARED
 345#define __S011  PAGE_SHARED
 346#define __S100  PAGE_READONLY
 347#define __S101  PAGE_READONLY
 348#define __S110  PAGE_SHARED
 349#define __S111  PAGE_SHARED
 350
 351/*
 352 * Define this to warn about kernel memory accesses that are
 353 * done without a 'access_ok(VERIFY_WRITE,..)'
 354 */
 355#undef TEST_ACCESS_OK
 356
 357#define pte_present(x)  (pte_val(x) & _PAGE_PRESENT)
 358#define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 359
 360#define pmd_none(x)     (!pmd_val(x))
 361#define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 362#define pmd_bad(x)      (pmd_val(x) & xAMPRx_SS)
 363#define pmd_clear(xp)   do { __set_pmd(xp, 0); } while(0)
 364
 365#define pmd_page_vaddr(pmd) \
 366        ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 367
 368#ifndef CONFIG_DISCONTIGMEM
 369#define pmd_page(pmd)   (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 370#endif
 371
 372#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
 373
 374/*
 375 * The following only work if pte_present() is true.
 376 * Undefined behaviour if not..
 377 */
 378static inline int pte_dirty(pte_t pte)          { return (pte).pte & _PAGE_DIRTY; }
 379static inline int pte_young(pte_t pte)          { return (pte).pte & _PAGE_ACCESSED; }
 380static inline int pte_write(pte_t pte)          { return !((pte).pte & _PAGE_WP); }
 381static inline int pte_special(pte_t pte)        { return 0; }
 382
 383static inline pte_t pte_mkclean(pte_t pte)      { (pte).pte &= ~_PAGE_DIRTY; return pte; }
 384static inline pte_t pte_mkold(pte_t pte)        { (pte).pte &= ~_PAGE_ACCESSED; return pte; }
 385static inline pte_t pte_wrprotect(pte_t pte)    { (pte).pte |= _PAGE_WP; return pte; }
 386static inline pte_t pte_mkdirty(pte_t pte)      { (pte).pte |= _PAGE_DIRTY; return pte; }
 387static inline pte_t pte_mkyoung(pte_t pte)      { (pte).pte |= _PAGE_ACCESSED; return pte; }
 388static inline pte_t pte_mkwrite(pte_t pte)      { (pte).pte &= ~_PAGE_WP; return pte; }
 389static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 390
 391static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 392{
 393        int i = test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
 394        asm volatile("dcf %M0" :: "U"(*ptep));
 395        return i;
 396}
 397
 398static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 399{
 400        unsigned long x = xchg(&ptep->pte, 0);
 401        asm volatile("dcf %M0" :: "U"(*ptep));
 402        return __pte(x);
 403}
 404
 405static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 406{
 407        set_bit(_PAGE_BIT_WP, ptep);
 408        asm volatile("dcf %M0" :: "U"(*ptep));
 409}
 410
 411/*
 412 * Macro to mark a page protection value as "uncacheable"
 413 */
 414#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_NOCACHE))
 415
 416/*
 417 * Conversion functions: convert a page and protection to a page entry,
 418 * and a page entry and page directory to the page they refer to.
 419 */
 420
 421#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 422#define mk_pte_huge(entry)      ((entry).pte_low |= _PAGE_PRESENT | _PAGE_PSE)
 423
 424/* This takes a physical page address that is used by the remapping functions */
 425#define mk_pte_phys(physpage, pgprot)   pfn_pte((physpage) >> PAGE_SHIFT, pgprot)
 426
 427static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 428{
 429        pte.pte &= _PAGE_CHG_MASK;
 430        pte.pte |= pgprot_val(newprot);
 431        return pte;
 432}
 433
 434/* to find an entry in a page-table-directory. */
 435#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 436#define pgd_index_k(addr) pgd_index(addr)
 437
 438/* Find an entry in the bottom-level page table.. */
 439#define __pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 440
 441/*
 442 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 443 *
 444 * this macro returns the index of the entry in the pte page which would
 445 * control the given virtual address
 446 */
 447#define pte_index(address) \
 448                (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 449#define pte_offset_kernel(dir, address) \
 450        ((pte_t *) pmd_page_vaddr(*(dir)) +  pte_index(address))
 451
 452#if defined(CONFIG_HIGHPTE)
 453#define pte_offset_map(dir, address) \
 454        ((pte_t *)kmap_atomic(pmd_page(*(dir))) + pte_index(address))
 455#define pte_unmap(pte) kunmap_atomic(pte)
 456#else
 457#define pte_offset_map(dir, address) \
 458        ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
 459#define pte_unmap(pte) do { } while (0)
 460#endif
 461
 462/*
 463 * Handle swap and file entries
 464 * - the PTE is encoded in the following format:
 465 *      bit 0:          Must be 0 (!_PAGE_PRESENT)
 466 *      bit 1:          Type: 0 for swap, 1 for file (_PAGE_FILE)
 467 *      bits 2-7:       Swap type
 468 *      bits 8-31:      Swap offset
 469 *      bits 2-31:      File pgoff
 470 */
 471#define __swp_type(x)                   (((x).val >> 2) & 0x1f)
 472#define __swp_offset(x)                 ((x).val >> 8)
 473#define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 2) | ((offset) << 8) })
 474#define __pte_to_swp_entry(_pte)        ((swp_entry_t) { (_pte).pte })
 475#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 476
 477static inline int pte_file(pte_t pte)
 478{
 479        return pte.pte & _PAGE_FILE;
 480}
 481
 482#define PTE_FILE_MAX_BITS       29
 483
 484#define pte_to_pgoff(PTE)       ((PTE).pte >> 2)
 485#define pgoff_to_pte(off)       __pte((off) << 2 | _PAGE_FILE)
 486
 487/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 488#define PageSkip(page)          (0)
 489#define kern_addr_valid(addr)   (1)
 490
 491#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 492#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 493#define __HAVE_ARCH_PTEP_SET_WRPROTECT
 494#define __HAVE_ARCH_PTE_SAME
 495#include <asm-generic/pgtable.h>
 496
 497/*
 498 * preload information about a newly instantiated PTE into the SCR0/SCR1 PGE cache
 499 */
 500static inline void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
 501{
 502        struct mm_struct *mm;
 503        unsigned long ampr;
 504
 505        mm = current->mm;
 506        if (mm) {
 507                pgd_t *pge = pgd_offset(mm, address);
 508                pud_t *pue = pud_offset(pge, address);
 509                pmd_t *pme = pmd_offset(pue, address);
 510
 511                ampr = pme->ste[0] & 0xffffff00;
 512                ampr |= xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C |
 513                        xAMPRx_V;
 514        } else {
 515                address = ULONG_MAX;
 516                ampr = 0;
 517        }
 518
 519        asm volatile("movgs %0,scr0\n"
 520                     "movgs %0,scr1\n"
 521                     "movgs %1,dampr4\n"
 522                     "movgs %1,dampr5\n"
 523                     :
 524                     : "r"(address), "r"(ampr)
 525                     );
 526}
 527
 528#ifdef CONFIG_PROC_FS
 529extern char *proc_pid_status_frv_cxnr(struct mm_struct *mm, char *buffer);
 530#endif
 531
 532extern void __init pgtable_cache_init(void);
 533
 534#endif /* !__ASSEMBLY__ */
 535#endif /* !CONFIG_MMU */
 536
 537#ifndef __ASSEMBLY__
 538extern void __init paging_init(void);
 539#endif /* !__ASSEMBLY__ */
 540
 541#endif /* _ASM_PGTABLE_H */
 542