LXR linux/include/asm-m32r/pgtable.h

   1#ifndef _ASM_M32R_PGTABLE_H
   2#define _ASM_M32R_PGTABLE_H
   3
   4#include <asm-generic/4level-fixup.h>
   5
   6#ifdef __KERNEL__
   7/*
   8 * The Linux memory management assumes a three-level page table setup. On
   9 * the M32R, we use that, but "fold" the mid level into the top-level page
  10 * table, so that we physically have the same two-level page table as the
  11 * M32R mmu expects.
  12 *
  13 * This file contains the functions and defines necessary to modify and use
  14 * the M32R page table tree.
  15 */
  16
  17/* CAUTION!: If you change macro definitions in this file, you might have to
  18 * change arch/m32r/mmu.S manually.
  19 */
  20
  21#ifndef __ASSEMBLY__
  22
  23#include <linux/config.h>
  24#include <linux/threads.h>
  25#include <asm/processor.h>
  26#include <asm/addrspace.h>
  27#include <asm/bitops.h>
  28#include <asm/page.h>
  29
  30extern pgd_t swapper_pg_dir[1024];
  31extern void paging_init(void);
  32
  33/*
  34 * ZERO_PAGE is a global shared page that is always zero: used
  35 * for zero-mapped memory areas etc..
  36 */
  37extern unsigned long empty_zero_page[1024];
  38#define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
  39
  40#endif /* !__ASSEMBLY__ */
  41
  42#ifndef __ASSEMBLY__
  43#include <asm/pgtable-2level.h>
  44#endif
  45
  46#define pgtable_cache_init()    do { } while (0)
  47
  48#define PMD_SIZE        (1UL << PMD_SHIFT)
  49#define PMD_MASK        (~(PMD_SIZE - 1))
  50#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  51#define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  52
  53#define USER_PTRS_PER_PGD       (TASK_SIZE / PGDIR_SIZE)
  54#define FIRST_USER_ADDRESS      0
  55
  56#ifndef __ASSEMBLY__
  57/* Just any arbitrary offset to the start of the vmalloc VM area: the
  58 * current 8MB value just means that there will be a 8MB "hole" after the
  59 * physical memory until the kernel virtual memory starts.  That means that
  60 * any out-of-bounds memory accesses will hopefully be caught.
  61 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  62 * area for the same reason. ;)
  63 */
  64#define VMALLOC_START           KSEG2
  65#define VMALLOC_END             KSEG3
  66
  67/*
  68 *     M32R TLB format
  69 *
  70 *     [0]    [1:19]           [20:23]       [24:31]
  71 *     +-----------------------+----+-------------+
  72 *     |          VPN          |0000|    ASID     |
  73 *     +-----------------------+----+-------------+
  74 *     +-+---------------------+----+-+---+-+-+-+-+
  75 *     |0         PPN          |0000|N|AC |L|G|V| |
  76 *     +-+---------------------+----+-+---+-+-+-+-+
  77 *                                     RWX
  78 */
  79
  80#define _PAGE_BIT_DIRTY         0       /* software: page changed */
  81#define _PAGE_BIT_FILE          0       /* when !present: nonlinear file
  82                                           mapping */
  83#define _PAGE_BIT_PRESENT       1       /* Valid: page is valid */
  84#define _PAGE_BIT_GLOBAL        2       /* Global */
  85#define _PAGE_BIT_LARGE         3       /* Large */
  86#define _PAGE_BIT_EXEC          4       /* Execute */
  87#define _PAGE_BIT_WRITE         5       /* Write */
  88#define _PAGE_BIT_READ          6       /* Read */
  89#define _PAGE_BIT_NONCACHABLE   7       /* Non cachable */
  90#define _PAGE_BIT_ACCESSED      8       /* software: page referenced */
  91#define _PAGE_BIT_PROTNONE      9       /* software: if not present */
  92
  93#define _PAGE_DIRTY             (1UL << _PAGE_BIT_DIRTY)
  94#define _PAGE_FILE              (1UL << _PAGE_BIT_FILE)
  95#define _PAGE_PRESENT           (1UL << _PAGE_BIT_PRESENT)
  96#define _PAGE_GLOBAL            (1UL << _PAGE_BIT_GLOBAL)
  97#define _PAGE_LARGE             (1UL << _PAGE_BIT_LARGE)
  98#define _PAGE_EXEC              (1UL << _PAGE_BIT_EXEC)
  99#define _PAGE_WRITE             (1UL << _PAGE_BIT_WRITE)
 100#define _PAGE_READ              (1UL << _PAGE_BIT_READ)
 101#define _PAGE_NONCACHABLE       (1UL << _PAGE_BIT_NONCACHABLE)
 102#define _PAGE_ACCESSED          (1UL << _PAGE_BIT_ACCESSED)
 103#define _PAGE_PROTNONE          (1UL << _PAGE_BIT_PROTNONE)
 104
 105#define _PAGE_TABLE     \
 106        ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
 107        | _PAGE_DIRTY )
 108#define _KERNPG_TABLE   \
 109        ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
 110        | _PAGE_DIRTY )
 111#define _PAGE_CHG_MASK  \
 112        ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
 113
 114#ifdef CONFIG_MMU
 115#define PAGE_NONE       \
 116        __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 117#define PAGE_SHARED     \
 118        __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
 119#define PAGE_SHARED_EXEC \
 120        __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
 121                | _PAGE_ACCESSED)
 122#define PAGE_COPY       \
 123        __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
 124#define PAGE_COPY_EXEC  \
 125        __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
 126#define PAGE_READONLY   \
 127        __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
 128#define PAGE_READONLY_EXEC \
 129        __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
 130
 131#define __PAGE_KERNEL   \
 132        ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
 133        | _PAGE_ACCESSED )
 134#define __PAGE_KERNEL_RO        ( __PAGE_KERNEL & ~_PAGE_WRITE )
 135#define __PAGE_KERNEL_NOCACHE   ( __PAGE_KERNEL | _PAGE_NONCACHABLE)
 136
 137#define MAKE_GLOBAL(x)  __pgprot((x) | _PAGE_GLOBAL)
 138
 139#define PAGE_KERNEL             MAKE_GLOBAL(__PAGE_KERNEL)
 140#define PAGE_KERNEL_RO          MAKE_GLOBAL(__PAGE_KERNEL_RO)
 141#define PAGE_KERNEL_NOCACHE     MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
 142
 143#else
 144#define PAGE_NONE               __pgprot(0)
 145#define PAGE_SHARED             __pgprot(0)
 146#define PAGE_SHARED_EXEC        __pgprot(0)
 147#define PAGE_COPY               __pgprot(0)
 148#define PAGE_COPY_EXEC          __pgprot(0)
 149#define PAGE_READONLY           __pgprot(0)
 150#define PAGE_READONLY_EXEC      __pgprot(0)
 151
 152#define PAGE_KERNEL             __pgprot(0)
 153#define PAGE_KERNEL_RO          __pgprot(0)
 154#define PAGE_KERNEL_NOCACHE     __pgprot(0)
 155#endif /* CONFIG_MMU */
 156
 157        /* xwr */
 158#define __P000  PAGE_NONE
 159#define __P001  PAGE_READONLY
 160#define __P010  PAGE_COPY
 161#define __P011  PAGE_COPY
 162#define __P100  PAGE_READONLY_EXEC
 163#define __P101  PAGE_READONLY_EXEC
 164#define __P110  PAGE_COPY_EXEC
 165#define __P111  PAGE_COPY_EXEC
 166
 167#define __S000  PAGE_NONE
 168#define __S001  PAGE_READONLY
 169#define __S010  PAGE_SHARED
 170#define __S011  PAGE_SHARED
 171#define __S100  PAGE_READONLY_EXEC
 172#define __S101  PAGE_READONLY_EXEC
 173#define __S110  PAGE_SHARED_EXEC
 174#define __S111  PAGE_SHARED_EXEC
 175
 176/* page table for 0-4MB for everybody */
 177
 178#define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 179#define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 180
 181#define pmd_none(x)     (!pmd_val(x))
 182#define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 183#define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 184#define pmd_bad(x)      ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
 185
 186#define pages_to_mb(x)  ((x) >> (20 - PAGE_SHIFT))
 187
 188/*
 189 * The following only work if pte_present() is true.
 190 * Undefined behaviour if not..
 191 */
 192static inline int pte_read(pte_t pte)
 193{
 194        return pte_val(pte) & _PAGE_READ;
 195}
 196
 197static inline int pte_exec(pte_t pte)
 198{
 199        return pte_val(pte) & _PAGE_EXEC;
 200}
 201
 202static inline int pte_dirty(pte_t pte)
 203{
 204        return pte_val(pte) & _PAGE_DIRTY;
 205}
 206
 207static inline int pte_young(pte_t pte)
 208{
 209        return pte_val(pte) & _PAGE_ACCESSED;
 210}
 211
 212static inline int pte_write(pte_t pte)
 213{
 214        return pte_val(pte) & _PAGE_WRITE;
 215}
 216
 217/*
 218 * The following only works if pte_present() is not true.
 219 */
 220static inline int pte_file(pte_t pte)
 221{
 222        return pte_val(pte) & _PAGE_FILE;
 223}
 224
 225static inline pte_t pte_rdprotect(pte_t pte)
 226{
 227        pte_val(pte) &= ~_PAGE_READ;
 228        return pte;
 229}
 230
 231static inline pte_t pte_exprotect(pte_t pte)
 232{
 233        pte_val(pte) &= ~_PAGE_EXEC;
 234        return pte;
 235}
 236
 237static inline pte_t pte_mkclean(pte_t pte)
 238{
 239        pte_val(pte) &= ~_PAGE_DIRTY;
 240        return pte;
 241}
 242
 243static inline pte_t pte_mkold(pte_t pte)
 244{
 245        pte_val(pte) &= ~_PAGE_ACCESSED;
 246        return pte;
 247}
 248
 249static inline pte_t pte_wrprotect(pte_t pte)
 250{
 251        pte_val(pte) &= ~_PAGE_WRITE;
 252        return pte;
 253}
 254
 255static inline pte_t pte_mkread(pte_t pte)
 256{
 257        pte_val(pte) |= _PAGE_READ;
 258        return pte;
 259}
 260
 261static inline pte_t pte_mkexec(pte_t pte)
 262{
 263        pte_val(pte) |= _PAGE_EXEC;
 264        return pte;
 265}
 266
 267static inline pte_t pte_mkdirty(pte_t pte)
 268{
 269        pte_val(pte) |= _PAGE_DIRTY;
 270        return pte;
 271}
 272
 273static inline pte_t pte_mkyoung(pte_t pte)
 274{
 275        pte_val(pte) |= _PAGE_ACCESSED;
 276        return pte;
 277}
 278
 279static inline pte_t pte_mkwrite(pte_t pte)
 280{
 281        pte_val(pte) |= _PAGE_WRITE;
 282        return pte;
 283}
 284
 285static inline  int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 286{
 287        return test_and_clear_bit(_PAGE_BIT_DIRTY, ptep);
 288}
 289
 290static inline  int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 291{
 292        return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
 293}
 294
 295static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 296{
 297        clear_bit(_PAGE_BIT_WRITE, ptep);
 298}
 299
 300/*
 301 * Macro and implementation to make a page protection as uncachable.
 302 */
 303static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 304{
 305        unsigned long prot = pgprot_val(_prot);
 306
 307        prot |= _PAGE_NONCACHABLE;
 308        return __pgprot(prot);
 309}
 310
 311#define pgprot_writecombine(prot) pgprot_noncached(prot)
 312
 313/*
 314 * Conversion functions: convert a page and protection to a page entry,
 315 * and a page entry and page directory to the page they refer to.
 316 */
 317#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), pgprot)
 318
 319static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 320{
 321        set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
 322                | pgprot_val(newprot)));
 323
 324        return pte;
 325}
 326
 327#define page_pte(page)  page_pte_prot(page, __pgprot(0))
 328
 329/*
 330 * Conversion functions: convert a page and protection to a page entry,
 331 * and a page entry and page directory to the page they refer to.
 332 */
 333
 334static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
 335{
 336        pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
 337}
 338
 339#define pmd_page_kernel(pmd)    \
 340        ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 341
 342#ifndef CONFIG_DISCONTIGMEM
 343#define pmd_page(pmd)   (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
 344#endif /* !CONFIG_DISCONTIGMEM */
 345
 346/* to find an entry in a page-table-directory. */
 347#define pgd_index(address)      \
 348        (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 349
 350#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 351
 352/* to find an entry in a kernel page-table-directory */
 353#define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 354
 355#define pmd_index(address)      \
 356        (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 357
 358#define pte_index(address)      \
 359        (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 360#define pte_offset_kernel(dir, address) \
 361        ((pte_t *)pmd_page_kernel(*(dir)) + pte_index(address))
 362#define pte_offset_map(dir, address)    \
 363        ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
 364#define pte_offset_map_nested(dir, address)     pte_offset_map(dir, address)
 365#define pte_unmap(pte)          do { } while (0)
 366#define pte_unmap_nested(pte)   do { } while (0)
 367
 368/* Encode and de-code a swap entry */
 369#define __swp_type(x)                   (((x).val >> 2) & 0x3f)
 370#define __swp_offset(x)                 ((x).val >> 10)
 371#define __swp_entry(type, offset)       \
 372        ((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
 373#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 374#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 375
 376#endif /* !__ASSEMBLY__ */
 377
 378/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 379#define kern_addr_valid(addr)   (1)
 380
 381#define io_remap_page_range(vma, vaddr, paddr, size, prot)      \
 382        remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
 383
 384#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 385                remap_pfn_range(vma, vaddr, pfn, size, prot)
 386
 387#define MK_IOSPACE_PFN(space, pfn)      (pfn)
 388#define GET_IOSPACE(pfn)                0
 389#define GET_PFN(pfn)                    (pfn)
 390
 391#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 392#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 393#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 394#define __HAVE_ARCH_PTEP_SET_WRPROTECT
 395#define __HAVE_ARCH_PTE_SAME
 396#include <asm-generic/pgtable.h>
 397
 398#endif /* __KERNEL__ */
 399
 400#endif /* _ASM_M32R_PGTABLE_H */
 401