arch/m32r/include/asm/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/threads.h>
  24 #include <linux/bitops.h>
  25 #include <asm/processor.h>
  26 #include <asm/addrspace.h>
  27 #include <asm/page.h>
  28
  29 struct mm_struct;
  30 struct vm_area_struct;
  31
  32 extern pgd_t swapper_pg_dir[1024];
  33 extern void paging_init(void);
  34
  35 /*
  36  * ZERO_PAGE is a global shared page that is always zero: used
  37  * for zero-mapped memory areas etc..
  38  */
  39 extern unsigned long empty_zero_page[1024];
  40 #define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
  41
  42 #endif /* !__ASSEMBLY__ */
  43
  44 #ifndef __ASSEMBLY__
  45 #include <asm/pgtable-2level.h>
  46 #endif
  47
  48 #define pgtable_cache_init()    do { } while (0)
  49
  50 #define PMD_SIZE        (1UL << PMD_SHIFT)
  51 #define PMD_MASK        (~(PMD_SIZE - 1))
  52 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
  53 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  54
  55 #define USER_PTRS_PER_PGD       (TASK_SIZE / PGDIR_SIZE)
  56 #define FIRST_USER_ADDRESS      0
  57
  58 #ifndef __ASSEMBLY__
  59 /* Just any arbitrary offset to the start of the vmalloc VM area: the
  60  * current 8MB value just means that there will be a 8MB "hole" after the
  61  * physical memory until the kernel virtual memory starts.  That means that
  62  * any out-of-bounds memory accesses will hopefully be caught.
  63  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  64  * area for the same reason. ;)
  65  */
  66 #define VMALLOC_START           KSEG2
  67 #define VMALLOC_END             KSEG3
  68
  69 /*
  70  *     M32R TLB format
  71  *
  72  *     [0]    [1:19]           [20:23]       [24:31]
  73  *     +-----------------------+----+-------------+
  74  *     |          VPN          |0000|    ASID     |
  75  *     +-----------------------+----+-------------+
  76  *     +-+---------------------+----+-+---+-+-+-+-+
  77  *     |0         PPN          |0000|N|AC |L|G|V| |
  78  *     +-+---------------------+----+-+---+-+-+-+-+
  79  *                                     RWX
  80  */
  81
  82 #define _PAGE_BIT_DIRTY         0       /* software: page changed */
  83 #define _PAGE_BIT_FILE          0       /* when !present: nonlinear file
  84                                            mapping */
  85 #define _PAGE_BIT_PRESENT       1       /* Valid: page is valid */
  86 #define _PAGE_BIT_GLOBAL        2       /* Global */
  87 #define _PAGE_BIT_LARGE         3       /* Large */
  88 #define _PAGE_BIT_EXEC          4       /* Execute */
  89 #define _PAGE_BIT_WRITE         5       /* Write */
  90 #define _PAGE_BIT_READ          6       /* Read */
  91 #define _PAGE_BIT_NONCACHABLE   7       /* Non cachable */
  92 #define _PAGE_BIT_ACCESSED      8       /* software: page referenced */
  93 #define _PAGE_BIT_PROTNONE      9       /* software: if not present */
  94
  95 #define _PAGE_DIRTY             (1UL << _PAGE_BIT_DIRTY)
  96 #define _PAGE_FILE              (1UL << _PAGE_BIT_FILE)
  97 #define _PAGE_PRESENT           (1UL << _PAGE_BIT_PRESENT)
  98 #define _PAGE_GLOBAL            (1UL << _PAGE_BIT_GLOBAL)
  99 #define _PAGE_LARGE             (1UL << _PAGE_BIT_LARGE)
 100 #define _PAGE_EXEC              (1UL << _PAGE_BIT_EXEC)
 101 #define _PAGE_WRITE             (1UL << _PAGE_BIT_WRITE)
 102 #define _PAGE_READ              (1UL << _PAGE_BIT_READ)
 103 #define _PAGE_NONCACHABLE       (1UL << _PAGE_BIT_NONCACHABLE)
 104 #define _PAGE_ACCESSED          (1UL << _PAGE_BIT_ACCESSED)
 105 #define _PAGE_PROTNONE          (1UL << _PAGE_BIT_PROTNONE)
 106
 107 #define _PAGE_TABLE     \
 108         ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
 109         | _PAGE_DIRTY )
 110 #define _KERNPG_TABLE   \
 111         ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \
 112         | _PAGE_DIRTY )
 113 #define _PAGE_CHG_MASK  \
 114         ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY )
 115
 116 #ifdef CONFIG_MMU
 117 #define PAGE_NONE       \
 118         __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 119 #define PAGE_SHARED     \
 120         __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED)
 121 #define PAGE_SHARED_EXEC \
 122         __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \
 123                 | _PAGE_ACCESSED)
 124 #define PAGE_COPY       \
 125         __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
 126 #define PAGE_COPY_EXEC  \
 127         __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
 128 #define PAGE_READONLY   \
 129         __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED)
 130 #define PAGE_READONLY_EXEC \
 131         __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED)
 132
 133 #define __PAGE_KERNEL   \
 134         ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \
 135         | _PAGE_ACCESSED )
 136 #define __PAGE_KERNEL_RO        ( __PAGE_KERNEL & ~_PAGE_WRITE )
 137 #define __PAGE_KERNEL_NOCACHE   ( __PAGE_KERNEL | _PAGE_NONCACHABLE)
 138
 139 #define MAKE_GLOBAL(x)  __pgprot((x) | _PAGE_GLOBAL)
 140
 141 #define PAGE_KERNEL             MAKE_GLOBAL(__PAGE_KERNEL)
 142 #define PAGE_KERNEL_RO          MAKE_GLOBAL(__PAGE_KERNEL_RO)
 143 #define PAGE_KERNEL_NOCACHE     MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
 144
 145 #else
 146 #define PAGE_NONE               __pgprot(0)
 147 #define PAGE_SHARED             __pgprot(0)
 148 #define PAGE_SHARED_EXEC        __pgprot(0)
 149 #define PAGE_COPY               __pgprot(0)
 150 #define PAGE_COPY_EXEC          __pgprot(0)
 151 #define PAGE_READONLY           __pgprot(0)
 152 #define PAGE_READONLY_EXEC      __pgprot(0)
 153
 154 #define PAGE_KERNEL             __pgprot(0)
 155 #define PAGE_KERNEL_RO          __pgprot(0)
 156 #define PAGE_KERNEL_NOCACHE     __pgprot(0)
 157 #endif /* CONFIG_MMU */
 158
 159         /* xwr */
 160 #define __P000  PAGE_NONE
 161 #define __P001  PAGE_READONLY
 162 #define __P010  PAGE_COPY
 163 #define __P011  PAGE_COPY
 164 #define __P100  PAGE_READONLY_EXEC
 165 #define __P101  PAGE_READONLY_EXEC
 166 #define __P110  PAGE_COPY_EXEC
 167 #define __P111  PAGE_COPY_EXEC
 168
 169 #define __S000  PAGE_NONE
 170 #define __S001  PAGE_READONLY
 171 #define __S010  PAGE_SHARED
 172 #define __S011  PAGE_SHARED
 173 #define __S100  PAGE_READONLY_EXEC
 174 #define __S101  PAGE_READONLY_EXEC
 175 #define __S110  PAGE_SHARED_EXEC
 176 #define __S111  PAGE_SHARED_EXEC
 177
 178 /* page table for 0-4MB for everybody */
 179
 180 #define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 181 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 182
 183 #define pmd_none(x)     (!pmd_val(x))
 184 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 185 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 186 #define pmd_bad(x)      ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE)
 187
 188 #define pages_to_mb(x)  ((x) >> (20 - PAGE_SHIFT))
 189
 190 /*
 191  * The following only work if pte_present() is true.
 192  * Undefined behaviour if not..
 193  */
 194 static inline int pte_dirty(pte_t pte)
 195 {
 196         return pte_val(pte) & _PAGE_DIRTY;
 197 }
 198
 199 static inline int pte_young(pte_t pte)
 200 {
 201         return pte_val(pte) & _PAGE_ACCESSED;
 202 }
 203
 204 static inline int pte_write(pte_t pte)
 205 {
 206         return pte_val(pte) & _PAGE_WRITE;
 207 }
 208
 209 /*
 210  * The following only works if pte_present() is not true.
 211  */
 212 static inline int pte_file(pte_t pte)
 213 {
 214         return pte_val(pte) & _PAGE_FILE;
 215 }
 216
 217 static inline int pte_special(pte_t pte)
 218 {
 219         return 0;
 220 }
 221
 222 static inline pte_t pte_mkclean(pte_t pte)
 223 {
 224         pte_val(pte) &= ~_PAGE_DIRTY;
 225         return pte;
 226 }
 227
 228 static inline pte_t pte_mkold(pte_t pte)
 229 {
 230         pte_val(pte) &= ~_PAGE_ACCESSED;
 231         return pte;
 232 }
 233
 234 static inline pte_t pte_wrprotect(pte_t pte)
 235 {
 236         pte_val(pte) &= ~_PAGE_WRITE;
 237         return pte;
 238 }
 239
 240 static inline pte_t pte_mkdirty(pte_t pte)
 241 {
 242         pte_val(pte) |= _PAGE_DIRTY;
 243         return pte;
 244 }
 245
 246 static inline pte_t pte_mkyoung(pte_t pte)
 247 {
 248         pte_val(pte) |= _PAGE_ACCESSED;
 249         return pte;
 250 }
 251
 252 static inline pte_t pte_mkwrite(pte_t pte)
 253 {
 254         pte_val(pte) |= _PAGE_WRITE;
 255         return pte;
 256 }
 257
 258 static inline pte_t pte_mkspecial(pte_t pte)
 259 {
 260         return pte;
 261 }
 262
 263 static inline  int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 264 {
 265         return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
 266 }
 267
 268 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 269 {
 270         clear_bit(_PAGE_BIT_WRITE, ptep);
 271 }
 272
 273 /*
 274  * Macro and implementation to make a page protection as uncachable.
 275  */
 276 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 277 {
 278         unsigned long prot = pgprot_val(_prot);
 279
 280         prot |= _PAGE_NONCACHABLE;
 281         return __pgprot(prot);
 282 }
 283
 284 #define pgprot_writecombine(prot) pgprot_noncached(prot)
 285
 286 /*
 287  * Conversion functions: convert a page and protection to a page entry,
 288  * and a page entry and page directory to the page they refer to.
 289  */
 290 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), pgprot)
 291
 292 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 293 {
 294         set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \
 295                 | pgprot_val(newprot)));
 296
 297         return pte;
 298 }
 299
 300 /*
 301  * Conversion functions: convert a page and protection to a page entry,
 302  * and a page entry and page directory to the page they refer to.
 303  */
 304
 305 static inline void pmd_set(pmd_t * pmdp, pte_t * ptep)
 306 {
 307         pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK);
 308 }
 309
 310 #define pmd_page_vaddr(pmd)     \
 311         ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 312
 313 #ifndef CONFIG_DISCONTIGMEM
 314 #define pmd_page(pmd)   (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE))
 315 #endif /* !CONFIG_DISCONTIGMEM */
 316
 317 /* to find an entry in a page-table-directory. */
 318 #define pgd_index(address)      \
 319         (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 320
 321 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 322
 323 /* to find an entry in a kernel page-table-directory */
 324 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 325
 326 #define pmd_index(address)      \
 327         (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 328
 329 #define pte_index(address)      \
 330         (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 331 #define pte_offset_kernel(dir, address) \
 332         ((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address))
 333 #define pte_offset_map(dir, address)    \
 334         ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
 335 #define pte_unmap(pte)          do { } while (0)
 336
 337 /* Encode and de-code a swap entry */
 338 #define __swp_type(x)                   (((x).val >> 2) & 0x1f)
 339 #define __swp_offset(x)                 ((x).val >> 10)
 340 #define __swp_entry(type, offset)       \
 341         ((swp_entry_t) { ((type) << 2) | ((offset) << 10) })
 342 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 343 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 344
 345 #endif /* !__ASSEMBLY__ */
 346
 347 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 348 #define kern_addr_valid(addr)   (1)
 349
 350 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 351                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 352
 353 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 354 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 355 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 356 #define __HAVE_ARCH_PTE_SAME
 357 #include <asm-generic/pgtable.h>
 358
 359 #endif /* __KERNEL__ */
 360
 361 #endif /* _ASM_M32R_PGTABLE_H */