arch/parisc/include/asm/pgtable.h

   1 #ifndef _PARISC_PGTABLE_H
   2 #define _PARISC_PGTABLE_H
   3
   4 #include <asm-generic/4level-fixup.h>
   5
   6 #include <asm/fixmap.h>
   7
   8 #ifndef __ASSEMBLY__
   9 /*
  10  * we simulate an x86-style page table for the linux mm code
  11  */
  12
  13 #include <linux/bitops.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/mm_types.h>
  16 #include <asm/processor.h>
  17 #include <asm/cache.h>
  18
  19 extern spinlock_t pa_tlb_lock;
  20
  21 /*
  22  * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel
  23  * memory.  For the return value to be meaningful, ADDR must be >=
  24  * PAGE_OFFSET.  This operation can be relatively expensive (e.g.,
  25  * require a hash-, or multi-level tree-lookup or something of that
  26  * sort) but it guarantees to return TRUE only if accessing the page
  27  * at that address does not cause an error.  Note that there may be
  28  * addresses for which kern_addr_valid() returns FALSE even though an
  29  * access would not cause an error (e.g., this is typically true for
  30  * memory mapped I/O regions.
  31  *
  32  * XXX Need to implement this for parisc.
  33  */
  34 #define kern_addr_valid(addr)   (1)
  35
  36 /* Purge data and instruction TLB entries.  Must be called holding
  37  * the pa_tlb_lock.  The TLB purge instructions are slow on SMP
  38  * machines since the purge must be broadcast to all CPUs.
  39  */
  40
  41 static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
  42 {
  43         mtsp(mm->context, 1);
  44         pdtlb(addr);
  45         if (unlikely(split_tlb))
  46                 pitlb(addr);
  47 }
  48
  49 /* Certain architectures need to do special things when PTEs
  50  * within a page table are directly modified.  Thus, the following
  51  * hook is made available.
  52  */
  53 #define set_pte(pteptr, pteval)                                 \
  54         do{                                                     \
  55                 *(pteptr) = (pteval);                           \
  56         } while(0)
  57
  58 #define pte_inserted(x)                                         \
  59         ((pte_val(x) & (_PAGE_PRESENT|_PAGE_ACCESSED))          \
  60          == (_PAGE_PRESENT|_PAGE_ACCESSED))
  61
  62 #define set_pte_at(mm, addr, ptep, pteval)                      \
  63         do {                                                    \
  64                 pte_t old_pte;                                  \
  65                 unsigned long flags;                            \
  66                 spin_lock_irqsave(&pa_tlb_lock, flags);         \
  67                 old_pte = *ptep;                                \
  68                 if (pte_inserted(old_pte))                      \
  69                         purge_tlb_entries(mm, addr);            \
  70                 set_pte(ptep, pteval);                          \
  71                 spin_unlock_irqrestore(&pa_tlb_lock, flags);    \
  72         } while (0)
  73
  74 #endif /* !__ASSEMBLY__ */
  75
  76 #include <asm/page.h>
  77
  78 #define pte_ERROR(e) \
  79         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  80 #define pmd_ERROR(e) \
  81         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, (unsigned long)pmd_val(e))
  82 #define pgd_ERROR(e) \
  83         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e))
  84
  85 /* This is the size of the initially mapped kernel memory */
  86 #if defined(CONFIG_64BIT)
  87 #define KERNEL_INITIAL_ORDER    26      /* 1<<26 = 64MB */
  88 #else
  89 #define KERNEL_INITIAL_ORDER    25      /* 1<<25 = 32MB */
  90 #endif
  91 #define KERNEL_INITIAL_SIZE     (1 << KERNEL_INITIAL_ORDER)
  92
  93 #if CONFIG_PGTABLE_LEVELS == 3
  94 #define PGD_ORDER       1 /* Number of pages per pgd */
  95 #define PMD_ORDER       1 /* Number of pages per pmd */
  96 #define PGD_ALLOC_ORDER 2 /* first pgd contains pmd */
  97 #else
  98 #define PGD_ORDER       1 /* Number of pages per pgd */
  99 #define PGD_ALLOC_ORDER PGD_ORDER
 100 #endif
 101
 102 /* Definitions for 3rd level (we use PLD here for Page Lower directory
 103  * because PTE_SHIFT is used lower down to mean shift that has to be
 104  * done to get usable bits out of the PTE) */
 105 #define PLD_SHIFT       PAGE_SHIFT
 106 #define PLD_SIZE        PAGE_SIZE
 107 #define BITS_PER_PTE    (PAGE_SHIFT - BITS_PER_PTE_ENTRY)
 108 #define PTRS_PER_PTE    (1UL << BITS_PER_PTE)
 109
 110 /* Definitions for 2nd level */
 111 #define pgtable_cache_init()    do { } while (0)
 112
 113 #define PMD_SHIFT       (PLD_SHIFT + BITS_PER_PTE)
 114 #define PMD_SIZE        (1UL << PMD_SHIFT)
 115 #define PMD_MASK        (~(PMD_SIZE-1))
 116 #if CONFIG_PGTABLE_LEVELS == 3
 117 #define BITS_PER_PMD    (PAGE_SHIFT + PMD_ORDER - BITS_PER_PMD_ENTRY)
 118 #else
 119 #define __PAGETABLE_PMD_FOLDED
 120 #define BITS_PER_PMD    0
 121 #endif
 122 #define PTRS_PER_PMD    (1UL << BITS_PER_PMD)
 123
 124 /* Definitions for 1st level */
 125 #define PGDIR_SHIFT     (PMD_SHIFT + BITS_PER_PMD)
 126 #if (PGDIR_SHIFT + PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY) > BITS_PER_LONG
 127 #define BITS_PER_PGD    (BITS_PER_LONG - PGDIR_SHIFT)
 128 #else
 129 #define BITS_PER_PGD    (PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY)
 130 #endif
 131 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
 132 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
 133 #define PTRS_PER_PGD    (1UL << BITS_PER_PGD)
 134 #define USER_PTRS_PER_PGD       PTRS_PER_PGD
 135
 136 #ifdef CONFIG_64BIT
 137 #define MAX_ADDRBITS    (PGDIR_SHIFT + BITS_PER_PGD)
 138 #define MAX_ADDRESS     (1UL << MAX_ADDRBITS)
 139 #define SPACEID_SHIFT   (MAX_ADDRBITS - 32)
 140 #else
 141 #define MAX_ADDRBITS    (BITS_PER_LONG)
 142 #define MAX_ADDRESS     (1UL << MAX_ADDRBITS)
 143 #define SPACEID_SHIFT   0
 144 #endif
 145
 146 /* This calculates the number of initial pages we need for the initial
 147  * page tables */
 148 #if (KERNEL_INITIAL_ORDER) >= (PMD_SHIFT)
 149 # define PT_INITIAL     (1 << (KERNEL_INITIAL_ORDER - PMD_SHIFT))
 150 #else
 151 # define PT_INITIAL     (1)  /* all initial PTEs fit into one page */
 152 #endif
 153
 154 /*
 155  * pgd entries used up by user/kernel:
 156  */
 157
 158 #define FIRST_USER_ADDRESS      0UL
 159
 160 /* NB: The tlb miss handlers make certain assumptions about the order */
 161 /*     of the following bits, so be careful (One example, bits 25-31  */
 162 /*     are moved together in one instruction).                        */
 163
 164 #define _PAGE_READ_BIT     31   /* (0x001) read access allowed */
 165 #define _PAGE_WRITE_BIT    30   /* (0x002) write access allowed */
 166 #define _PAGE_EXEC_BIT     29   /* (0x004) execute access allowed */
 167 #define _PAGE_GATEWAY_BIT  28   /* (0x008) privilege promotion allowed */
 168 #define _PAGE_DMB_BIT      27   /* (0x010) Data Memory Break enable (B bit) */
 169 #define _PAGE_DIRTY_BIT    26   /* (0x020) Page Dirty (D bit) */
 170 #define _PAGE_REFTRAP_BIT  25   /* (0x040) Page Ref. Trap enable (T bit) */
 171 #define _PAGE_NO_CACHE_BIT 24   /* (0x080) Uncached Page (U bit) */
 172 #define _PAGE_ACCESSED_BIT 23   /* (0x100) Software: Page Accessed */
 173 #define _PAGE_PRESENT_BIT  22   /* (0x200) Software: translation valid */
 174 #define _PAGE_HPAGE_BIT    21   /* (0x400) Software: Huge Page */
 175 #define _PAGE_USER_BIT     20   /* (0x800) Software: User accessible page */
 176
 177 /* N.B. The bits are defined in terms of a 32 bit word above, so the */
 178 /*      following macro is ok for both 32 and 64 bit.                */
 179
 180 #define xlate_pabit(x) (31 - x)
 181
 182 /* this defines the shift to the usable bits in the PTE it is set so
 183  * that the valid bits _PAGE_PRESENT_BIT and _PAGE_USER_BIT are set
 184  * to zero */
 185 #define PTE_SHIFT               xlate_pabit(_PAGE_USER_BIT)
 186
 187 /* PFN_PTE_SHIFT defines the shift of a PTE value to access the PFN field */
 188 #define PFN_PTE_SHIFT           12
 189
 190 #define _PAGE_READ     (1 << xlate_pabit(_PAGE_READ_BIT))
 191 #define _PAGE_WRITE    (1 << xlate_pabit(_PAGE_WRITE_BIT))
 192 #define _PAGE_RW       (_PAGE_READ | _PAGE_WRITE)
 193 #define _PAGE_EXEC     (1 << xlate_pabit(_PAGE_EXEC_BIT))
 194 #define _PAGE_GATEWAY  (1 << xlate_pabit(_PAGE_GATEWAY_BIT))
 195 #define _PAGE_DMB      (1 << xlate_pabit(_PAGE_DMB_BIT))
 196 #define _PAGE_DIRTY    (1 << xlate_pabit(_PAGE_DIRTY_BIT))
 197 #define _PAGE_REFTRAP  (1 << xlate_pabit(_PAGE_REFTRAP_BIT))
 198 #define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT))
 199 #define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT))
 200 #define _PAGE_PRESENT  (1 << xlate_pabit(_PAGE_PRESENT_BIT))
 201 #define _PAGE_HUGE     (1 << xlate_pabit(_PAGE_HPAGE_BIT))
 202 #define _PAGE_USER     (1 << xlate_pabit(_PAGE_USER_BIT))
 203
 204 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE |  _PAGE_DIRTY | _PAGE_ACCESSED)
 205 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 206 #define _PAGE_KERNEL_RO (_PAGE_PRESENT | _PAGE_READ | _PAGE_DIRTY | _PAGE_ACCESSED)
 207 #define _PAGE_KERNEL_EXEC       (_PAGE_KERNEL_RO | _PAGE_EXEC)
 208 #define _PAGE_KERNEL_RWX        (_PAGE_KERNEL_EXEC | _PAGE_WRITE)
 209 #define _PAGE_KERNEL            (_PAGE_KERNEL_RO | _PAGE_WRITE)
 210
 211 /* The pgd/pmd contains a ptr (in phys addr space); since all pgds/pmds
 212  * are page-aligned, we don't care about the PAGE_OFFSET bits, except
 213  * for a few meta-information bits, so we shift the address to be
 214  * able to effectively address 40/42/44-bits of physical address space
 215  * depending on 4k/16k/64k PAGE_SIZE */
 216 #define _PxD_PRESENT_BIT   31
 217 #define _PxD_ATTACHED_BIT  30
 218 #define _PxD_VALID_BIT     29
 219
 220 #define PxD_FLAG_PRESENT  (1 << xlate_pabit(_PxD_PRESENT_BIT))
 221 #define PxD_FLAG_ATTACHED (1 << xlate_pabit(_PxD_ATTACHED_BIT))
 222 #define PxD_FLAG_VALID    (1 << xlate_pabit(_PxD_VALID_BIT))
 223 #define PxD_FLAG_MASK     (0xf)
 224 #define PxD_FLAG_SHIFT    (4)
 225 #define PxD_VALUE_SHIFT   (PFN_PTE_SHIFT-PxD_FLAG_SHIFT)
 226
 227 #ifndef __ASSEMBLY__
 228
 229 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 230 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_ACCESSED)
 231 /* Others seem to make this executable, I don't know if that's correct
 232    or not.  The stack is mapped this way though so this is necessary
 233    in the short term - dhd@linuxcare.com, 2000-08-08 */
 234 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_ACCESSED)
 235 #define PAGE_WRITEONLY  __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITE | _PAGE_ACCESSED)
 236 #define PAGE_EXECREAD   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_EXEC |_PAGE_ACCESSED)
 237 #define PAGE_COPY       PAGE_EXECREAD
 238 #define PAGE_RWX        __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC |_PAGE_ACCESSED)
 239 #define PAGE_KERNEL     __pgprot(_PAGE_KERNEL)
 240 #define PAGE_KERNEL_EXEC        __pgprot(_PAGE_KERNEL_EXEC)
 241 #define PAGE_KERNEL_RWX __pgprot(_PAGE_KERNEL_RWX)
 242 #define PAGE_KERNEL_RO  __pgprot(_PAGE_KERNEL_RO)
 243 #define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
 244 #define PAGE_GATEWAY    __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_GATEWAY| _PAGE_READ)
 245
 246
 247 /*
 248  * We could have an execute only page using "gateway - promote to priv
 249  * level 3", but that is kind of silly. So, the way things are defined
 250  * now, we must always have read permission for pages with execute
 251  * permission. For the fun of it we'll go ahead and support write only
 252  * pages.
 253  */
 254
 255          /*xwr*/
 256 #define __P000  PAGE_NONE
 257 #define __P001  PAGE_READONLY
 258 #define __P010  __P000 /* copy on write */
 259 #define __P011  __P001 /* copy on write */
 260 #define __P100  PAGE_EXECREAD
 261 #define __P101  PAGE_EXECREAD
 262 #define __P110  __P100 /* copy on write */
 263 #define __P111  __P101 /* copy on write */
 264
 265 #define __S000  PAGE_NONE
 266 #define __S001  PAGE_READONLY
 267 #define __S010  PAGE_WRITEONLY
 268 #define __S011  PAGE_SHARED
 269 #define __S100  PAGE_EXECREAD
 270 #define __S101  PAGE_EXECREAD
 271 #define __S110  PAGE_RWX
 272 #define __S111  PAGE_RWX
 273
 274
 275 extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */
 276
 277 /* initial page tables for 0-8MB for kernel */
 278
 279 extern pte_t pg0[];
 280
 281 /* zero page used for uninitialized stuff */
 282
 283 extern unsigned long *empty_zero_page;
 284
 285 /*
 286  * ZERO_PAGE is a global shared page that is always zero: used
 287  * for zero-mapped memory areas etc..
 288  */
 289
 290 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 291
 292 #define pte_none(x)     (pte_val(x) == 0)
 293 #define pte_present(x)  (pte_val(x) & _PAGE_PRESENT)
 294 #define pte_clear(mm, addr, xp)  set_pte_at(mm, addr, xp, __pte(0))
 295
 296 #define pmd_flag(x)     (pmd_val(x) & PxD_FLAG_MASK)
 297 #define pmd_address(x)  ((unsigned long)(pmd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT)
 298 #define pgd_flag(x)     (pgd_val(x) & PxD_FLAG_MASK)
 299 #define pgd_address(x)  ((unsigned long)(pgd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT)
 300
 301 #if CONFIG_PGTABLE_LEVELS == 3
 302 /* The first entry of the permanent pmd is not there if it contains
 303  * the gateway marker */
 304 #define pmd_none(x)     (!pmd_val(x) || pmd_flag(x) == PxD_FLAG_ATTACHED)
 305 #else
 306 #define pmd_none(x)     (!pmd_val(x))
 307 #endif
 308 #define pmd_bad(x)      (!(pmd_flag(x) & PxD_FLAG_VALID))
 309 #define pmd_present(x)  (pmd_flag(x) & PxD_FLAG_PRESENT)
 310 static inline void pmd_clear(pmd_t *pmd) {
 311 #if CONFIG_PGTABLE_LEVELS == 3
 312         if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED)
 313                 /* This is the entry pointing to the permanent pmd
 314                  * attached to the pgd; cannot clear it */
 315                 __pmd_val_set(*pmd, PxD_FLAG_ATTACHED);
 316         else
 317 #endif
 318                 __pmd_val_set(*pmd,  0);
 319 }
 320
 321
 322
 323 #if CONFIG_PGTABLE_LEVELS == 3
 324 #define pgd_page_vaddr(pgd) ((unsigned long) __va(pgd_address(pgd)))
 325 #define pgd_page(pgd)   virt_to_page((void *)pgd_page_vaddr(pgd))
 326
 327 /* For 64 bit we have three level tables */
 328
 329 #define pgd_none(x)     (!pgd_val(x))
 330 #define pgd_bad(x)      (!(pgd_flag(x) & PxD_FLAG_VALID))
 331 #define pgd_present(x)  (pgd_flag(x) & PxD_FLAG_PRESENT)
 332 static inline void pgd_clear(pgd_t *pgd) {
 333 #if CONFIG_PGTABLE_LEVELS == 3
 334         if(pgd_flag(*pgd) & PxD_FLAG_ATTACHED)
 335                 /* This is the permanent pmd attached to the pgd; cannot
 336                  * free it */
 337                 return;
 338 #endif
 339         __pgd_val_set(*pgd, 0);
 340 }
 341 #else
 342 /*
 343  * The "pgd_xxx()" functions here are trivial for a folded two-level
 344  * setup: the pgd is never bad, and a pmd always exists (as it's folded
 345  * into the pgd entry)
 346  */
 347 static inline int pgd_none(pgd_t pgd)           { return 0; }
 348 static inline int pgd_bad(pgd_t pgd)            { return 0; }
 349 static inline int pgd_present(pgd_t pgd)        { return 1; }
 350 static inline void pgd_clear(pgd_t * pgdp)      { }
 351 #endif
 352
 353 /*
 354  * The following only work if pte_present() is true.
 355  * Undefined behaviour if not..
 356  */
 357 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 358 static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 359 static inline int pte_write(pte_t pte)          { return pte_val(pte) & _PAGE_WRITE; }
 360 static inline int pte_special(pte_t pte)        { return 0; }
 361
 362 static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 363 static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 364 static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) &= ~_PAGE_WRITE; return pte; }
 365 static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
 366 static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 367 static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) |= _PAGE_WRITE; return pte; }
 368 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 369
 370 /*
 371  * Huge pte definitions.
 372  */
 373 #ifdef CONFIG_HUGETLB_PAGE
 374 #define pte_huge(pte)           (pte_val(pte) & _PAGE_HUGE)
 375 #define pte_mkhuge(pte)         (__pte(pte_val(pte) | \
 376                                  (parisc_requires_coherency() ? 0 : _PAGE_HUGE)))
 377 #else
 378 #define pte_huge(pte)           (0)
 379 #define pte_mkhuge(pte)         (pte)
 380 #endif
 381
 382
 383 /*
 384  * Conversion functions: convert a page and protection to a page entry,
 385  * and a page entry and page directory to the page they refer to.
 386  */
 387 #define __mk_pte(addr,pgprot) \
 388 ({                                                                      \
 389         pte_t __pte;                                                    \
 390                                                                         \
 391         pte_val(__pte) = ((((addr)>>PAGE_SHIFT)<<PFN_PTE_SHIFT) + pgprot_val(pgprot));  \
 392                                                                         \
 393         __pte;                                                          \
 394 })
 395
 396 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 397
 398 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
 399 {
 400         pte_t pte;
 401         pte_val(pte) = (pfn << PFN_PTE_SHIFT) | pgprot_val(pgprot);
 402         return pte;
 403 }
 404
 405 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 406 { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
 407
 408 /* Permanent address of a page.  On parisc we don't have highmem. */
 409
 410 #define pte_pfn(x)              (pte_val(x) >> PFN_PTE_SHIFT)
 411
 412 #define pte_page(pte)           (pfn_to_page(pte_pfn(pte)))
 413
 414 #define pmd_page_vaddr(pmd)     ((unsigned long) __va(pmd_address(pmd)))
 415
 416 #define __pmd_page(pmd) ((unsigned long) __va(pmd_address(pmd)))
 417 #define pmd_page(pmd)   virt_to_page((void *)__pmd_page(pmd))
 418
 419 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 420
 421 /* to find an entry in a page-table-directory */
 422 #define pgd_offset(mm, address) \
 423 ((mm)->pgd + ((address) >> PGDIR_SHIFT))
 424
 425 /* to find an entry in a kernel page-table-directory */
 426 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 427
 428 /* Find an entry in the second-level page table.. */
 429
 430 #if CONFIG_PGTABLE_LEVELS == 3
 431 #define pmd_index(addr)         (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 432 #define pmd_offset(dir,address) \
 433 ((pmd_t *) pgd_page_vaddr(*(dir)) + pmd_index(address))
 434 #else
 435 #define pmd_offset(dir,addr) ((pmd_t *) dir)
 436 #endif
 437
 438 /* Find an entry in the third-level page table.. */
 439 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
 440 #define pte_offset_kernel(pmd, address) \
 441         ((pte_t *) pmd_page_vaddr(*(pmd)) + pte_index(address))
 442 #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address)
 443 #define pte_unmap(pte) do { } while (0)
 444
 445 #define pte_unmap(pte)                  do { } while (0)
 446 #define pte_unmap_nested(pte)           do { } while (0)
 447
 448 extern void paging_init (void);
 449
 450 /* Used for deferring calls to flush_dcache_page() */
 451
 452 #define PG_dcache_dirty         PG_arch_1
 453
 454 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *);
 455
 456 /* Encode and de-code a swap entry */
 457
 458 #define __swp_type(x)                     ((x).val & 0x1f)
 459 #define __swp_offset(x)                   ( (((x).val >> 6) &  0x7) | \
 460                                           (((x).val >> 8) & ~0x7) )
 461 #define __swp_entry(type, offset)         ((swp_entry_t) { (type) | \
 462                                             ((offset &  0x7) << 6) | \
 463                                             ((offset & ~0x7) << 8) })
 464 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 465 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 466
 467 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 468 {
 469         pte_t pte;
 470         unsigned long flags;
 471
 472         if (!pte_young(*ptep))
 473                 return 0;
 474
 475         spin_lock_irqsave(&pa_tlb_lock, flags);
 476         pte = *ptep;
 477         if (!pte_young(pte)) {
 478                 spin_unlock_irqrestore(&pa_tlb_lock, flags);
 479                 return 0;
 480         }
 481         purge_tlb_entries(vma->vm_mm, addr);
 482         set_pte(ptep, pte_mkold(pte));
 483         spin_unlock_irqrestore(&pa_tlb_lock, flags);
 484         return 1;
 485 }
 486
 487 struct mm_struct;
 488 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 489 {
 490         pte_t old_pte;
 491         unsigned long flags;
 492
 493         spin_lock_irqsave(&pa_tlb_lock, flags);
 494         old_pte = *ptep;
 495         if (pte_inserted(old_pte))
 496                 purge_tlb_entries(mm, addr);
 497         set_pte(ptep, __pte(0));
 498         spin_unlock_irqrestore(&pa_tlb_lock, flags);
 499
 500         return old_pte;
 501 }
 502
 503 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 504 {
 505         unsigned long flags;
 506         spin_lock_irqsave(&pa_tlb_lock, flags);
 507         purge_tlb_entries(mm, addr);
 508         set_pte(ptep, pte_wrprotect(*ptep));
 509         spin_unlock_irqrestore(&pa_tlb_lock, flags);
 510 }
 511
 512 #define pte_same(A,B)   (pte_val(A) == pte_val(B))
 513
 514 #endif /* !__ASSEMBLY__ */
 515
 516
 517 /* TLB page size encoding - see table 3-1 in parisc20.pdf */
 518 #define _PAGE_SIZE_ENCODING_4K          0
 519 #define _PAGE_SIZE_ENCODING_16K         1
 520 #define _PAGE_SIZE_ENCODING_64K         2
 521 #define _PAGE_SIZE_ENCODING_256K        3
 522 #define _PAGE_SIZE_ENCODING_1M          4
 523 #define _PAGE_SIZE_ENCODING_4M          5
 524 #define _PAGE_SIZE_ENCODING_16M         6
 525 #define _PAGE_SIZE_ENCODING_64M         7
 526
 527 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 528 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4K
 529 #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
 530 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16K
 531 #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
 532 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_64K
 533 #endif
 534
 535
 536 #define pgprot_noncached(prot) __pgprot(pgprot_val(prot) | _PAGE_NO_CACHE)
 537
 538 /* We provide our own get_unmapped_area to provide cache coherency */
 539
 540 #define HAVE_ARCH_UNMAPPED_AREA
 541 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 542
 543 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 544 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 545 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 546 #define __HAVE_ARCH_PTE_SAME
 547 #include <asm-generic/pgtable.h>
 548
 549 #endif /* _PARISC_PGTABLE_H */