include/asm-parisc/pgtable.h

   1 #ifndef _PARISC_PGTABLE_H
   2 #define _PARISC_PGTABLE_H
   3
   4 #ifndef __ASSEMBLY__
   5 /*
   6  * we simulate an x86-style page table for the linux mm code
   7  */
   8
   9 #include <asm/processor.h>
  10 #include <asm/fixmap.h>
  11 #include <asm/cache.h>
  12
  13 /* To make 53c7xx.c happy */
  14
  15 #define IOMAP_FULL_CACHING      2               /* used for 'what' below */
  16 #define IOMAP_NOCACHE_SER       3
  17
  18 extern void kernel_set_cachemode(unsigned long addr,
  19                                     unsigned long size, int what);
  20
  21 /*
  22  * cache_clear() semantics: Clear any cache entries for the area in question,
  23  * without writing back dirty entries first. This is useful if the data will
  24  * be overwritten anyway, e.g. by DMA to memory. The range is defined by a
  25  * _physical_ address.
  26  */
  27 #define cache_clear(paddr, len)                 do { } while (0)
  28 /*
  29  * cache_push() semantics: Write back any dirty cache data in the given area,
  30  * and invalidate the range in the instruction cache. It needs not (but may)
  31  * invalidate those entries also in the data cache. The range is defined by a
  32  * _physical_ address.
  33  */
  34 #define cache_push(paddr, len) \
  35         do { \
  36                 unsigned long vaddr = phys_to_virt(paddr); \
  37                 flush_cache_range(&init_mm, vaddr, vaddr + len); \
  38         } while(0)
  39 #define cache_push_v(vaddr, len) \
  40                         flush_cache_range(&init_mm, vaddr, vaddr + len)
  41
  42 /*
  43  * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel
  44  * memory.  For the return value to be meaningful, ADDR must be >=
  45  * PAGE_OFFSET.  This operation can be relatively expensive (e.g.,
  46  * require a hash-, or multi-level tree-lookup or something of that
  47  * sort) but it guarantees to return TRUE only if accessing the page
  48  * at that address does not cause an error.  Note that there may be
  49  * addresses for which kern_addr_valid() returns FALSE even though an
  50  * access would not cause an error (e.g., this is typically true for
  51  * memory mapped I/O regions.
  52  *
  53  * XXX Need to implement this for parisc.
  54  */
  55 #define kern_addr_valid(addr)   (1)
  56
  57 /* Certain architectures need to do special things when PTEs
  58  * within a page table are directly modified.  Thus, the following
  59  * hook is made available.
  60  */
  61 #define set_pte(pteptr, pteval)                                 \
  62         do{                                                     \
  63                 *(pteptr) = (pteval);                           \
  64         } while(0)
  65
  66
  67
  68 #endif /* !__ASSEMBLY__ */
  69
  70 #define pte_ERROR(e) \
  71         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  72 #define pmd_ERROR(e) \
  73         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
  74 #define pgd_ERROR(e) \
  75         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  76
  77 /*
  78  * pgd entries used up by user/kernel:
  79  */
  80
  81 #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
  82 #define FIRST_USER_PGD_NR       0
  83
  84 #ifndef __ASSEMBLY__
  85 extern  void *vmalloc_start;
  86 #define PCXL_DMA_MAP_SIZE   (8*1024*1024)
  87 #define VMALLOC_START   ((unsigned long)vmalloc_start)
  88 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
  89 #define VMALLOC_END     (FIXADDR_START)
  90 #endif
  91
  92 #define _PAGE_READ      0x001   /* read access allowed */
  93 #define _PAGE_WRITE     0x002   /* write access allowed */
  94 #define _PAGE_EXEC      0x004   /* execute access allowed */
  95 #define _PAGE_GATEWAY   0x008   /* privilege promotion allowed */
  96 #define _PAGE_GATEWAY_BIT 28    /* _PAGE_GATEWAY & _PAGE_GATEWAY_BIT need */
  97                                 /* to agree. One could be defined in relation */
  98                                 /* to the other, but that's kind of ugly. */
  99
 100                                 /* 0x010 reserved (B bit) */
 101 #define _PAGE_DIRTY     0x020   /* D: dirty */
 102                                 /* 0x040 reserved (T bit) */
 103 #define _PAGE_NO_CACHE  0x080   /* Software: Uncacheable */
 104 #define _PAGE_NO_CACHE_BIT 24   /* Needs to agree with _PAGE_NO_CACHE above */
 105 #define _PAGE_ACCESSED  0x100   /* R: page cache referenced */
 106 #define _PAGE_PRESENT   0x200   /* Software: pte contains a translation */
 107 #define _PAGE_PRESENT_BIT  22   /* Needs to agree with _PAGE_PRESENT above */
 108 #define _PAGE_USER      0x400   /* Software: User accessable page */
 109 #define _PAGE_USER_BIT     21   /* Needs to agree with _PAGE_USER above */
 110                                 /* 0x800 still available */
 111
 112 #ifdef __ASSEMBLY__
 113 #define _PGB_(x)        (1 << (63 - (x)))
 114 #define __PAGE_O        _PGB_(13)
 115 #define __PAGE_U        _PGB_(12)
 116 #define __PAGE_T        _PGB_(2)
 117 #define __PAGE_D        _PGB_(3)
 118 #define __PAGE_B        _PGB_(4)
 119 #define __PAGE_P        _PGB_(14)
 120 #endif
 121 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE |  _PAGE_DIRTY | _PAGE_ACCESSED)
 122 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 123 #define _PAGE_KERNEL    (_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED)
 124
 125 #ifndef __ASSEMBLY__
 126
 127 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 128 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_ACCESSED)
 129 /* Others seem to make this executable, I don't know if that's correct
 130    or not.  The stack is mapped this way though so this is necessary
 131    in the short term - dhd@linuxcare.com, 2000-08-08 */
 132 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_ACCESSED)
 133 #define PAGE_WRITEONLY  __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITE | _PAGE_ACCESSED)
 134 #define PAGE_EXECREAD   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_EXEC |_PAGE_ACCESSED)
 135 #define PAGE_COPY       PAGE_EXECREAD
 136 #define PAGE_RWX        __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC |_PAGE_ACCESSED)
 137 #define PAGE_KERNEL     __pgprot(_PAGE_KERNEL)
 138 #define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_DIRTY | _PAGE_ACCESSED)
 139 #define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
 140 #define PAGE_GATEWAY    __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_GATEWAY| _PAGE_READ)
 141
 142
 143 /*
 144  * We could have an execute only page using "gateway - promote to priv
 145  * level 3", but that is kind of silly. So, the way things are defined
 146  * now, we must always have read permission for pages with execute
 147  * permission. For the fun of it we'll go ahead and support write only
 148  * pages.
 149  */
 150
 151          /*xwr*/
 152 #define __P000  PAGE_NONE
 153 #define __P001  PAGE_READONLY
 154 #define __P010  __P000 /* copy on write */
 155 #define __P011  __P001 /* copy on write */
 156 #define __P100  PAGE_EXECREAD
 157 #define __P101  PAGE_EXECREAD
 158 #define __P110  __P100 /* copy on write */
 159 #define __P111  __P101 /* copy on write */
 160
 161 #define __S000  PAGE_NONE
 162 #define __S001  PAGE_READONLY
 163 #define __S010  PAGE_WRITEONLY
 164 #define __S011  PAGE_SHARED
 165 #define __S100  PAGE_EXECREAD
 166 #define __S101  PAGE_EXECREAD
 167 #define __S110  PAGE_RWX
 168 #define __S111  PAGE_RWX
 169
 170 extern unsigned long swapper_pg_dir[]; /* declared in init_task.c */
 171
 172 /* initial page tables for 0-8MB for kernel */
 173
 174 extern unsigned long pg0[];
 175
 176 /* zero page used for uninitialized stuff */
 177
 178 extern unsigned long *empty_zero_page;
 179
 180 /*
 181  * BAD_PAGETABLE is used when we need a bogus page-table, while
 182  * BAD_PAGE is used for a bogus page.
 183  *
 184  * ZERO_PAGE is a global shared page that is always zero: used
 185  * for zero-mapped memory areas etc..
 186  */
 187 extern pte_t __bad_page(void);
 188 extern pte_t * __bad_pagetable(void);
 189
 190 #define BAD_PAGETABLE __bad_pagetable()
 191 #define BAD_PAGE __bad_page()
 192 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 193
 194 #define pte_none(x)     (!pte_val(x))
 195 #define pte_present(x)  (pte_val(x) & _PAGE_PRESENT)
 196 #define pte_clear(xp)   do { pte_val(*(xp)) = 0; } while (0)
 197 #define pte_pagenr(x)   ((unsigned long)((pte_val(x) >> PAGE_SHIFT)))
 198
 199 #define pmd_none(x)     (!pmd_val(x))
 200 #define pmd_bad(x)      ((pmd_val(x) & ~PAGE_MASK) != _PAGE_TABLE)
 201 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 202 #define pmd_clear(xp)   do { pmd_val(*(xp)) = 0; } while (0)
 203
 204
 205
 206 #ifdef __LP64__
 207 #define pgd_page(pgd) ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
 208
 209 /* For 64 bit we have three level tables */
 210
 211 #define pgd_none(x)     (!pgd_val(x))
 212 #define pgd_bad(x)      ((pgd_val(x) & ~PAGE_MASK) != _PAGE_TABLE)
 213 #define pgd_present(x)  (pgd_val(x) & _PAGE_PRESENT)
 214 #define pgd_clear(xp)   do { pgd_val(*(xp)) = 0; } while (0)
 215 #else
 216 /*
 217  * The "pgd_xxx()" functions here are trivial for a folded two-level
 218  * setup: the pgd is never bad, and a pmd always exists (as it's folded
 219  * into the pgd entry)
 220  */
 221 extern inline int pgd_none(pgd_t pgd)           { return 0; }
 222 extern inline int pgd_bad(pgd_t pgd)            { return 0; }
 223 extern inline int pgd_present(pgd_t pgd)        { return 1; }
 224 extern inline void pgd_clear(pgd_t * pgdp)      { }
 225 #endif
 226
 227 /*
 228  * The following only work if pte_present() is true.
 229  * Undefined behaviour if not..
 230  */
 231 extern inline int pte_read(pte_t pte)           { return pte_val(pte) & _PAGE_READ; }
 232 extern inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 233 extern inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 234 extern inline int pte_write(pte_t pte)          { return pte_val(pte) & _PAGE_WRITE; }
 235
 236 extern inline pte_t pte_rdprotect(pte_t pte)    { pte_val(pte) &= ~_PAGE_READ; return pte; }
 237 extern inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
 238 extern inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 239 extern inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) &= ~_PAGE_WRITE; return pte; }
 240 extern inline pte_t pte_mkread(pte_t pte)       { pte_val(pte) |= _PAGE_READ; return pte; }
 241 extern inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
 242 extern inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 243 extern inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) |= _PAGE_WRITE; return pte; }
 244
 245 /*
 246  * Conversion functions: convert a page and protection to a page entry,
 247  * and a page entry and page directory to the page they refer to.
 248  */
 249 #define __mk_pte(addr,pgprot) \
 250 ({                                                                      \
 251         pte_t __pte;                                                    \
 252                                                                         \
 253         pte_val(__pte) = ((addr)+pgprot_val(pgprot));                   \
 254                                                                         \
 255         __pte;                                                          \
 256 })
 257
 258 #define mk_pte(page,pgprot) \
 259 ({                                                                      \
 260         pte_t __pte;                                                    \
 261                                                                         \
 262         pte_val(__pte) = ((page)-mem_map)*PAGE_SIZE +                   \
 263                                 pgprot_val(pgprot);                     \
 264         __pte;                                                          \
 265 })
 266
 267 /* This takes a physical page address that is used by the remapping functions */
 268 #define mk_pte_phys(physpage, pgprot) \
 269 ({ pte_t __pte; pte_val(__pte) = physpage + pgprot_val(pgprot); __pte; })
 270
 271 extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 272 { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
 273
 274 /*
 275  * Permanent address of a page. Obviously must never be
 276  * called on a highmem page.
 277  */
 278 #define page_address(page) ({ if (!(page)->virtual) BUG(); (page)->virtual; })
 279 #define __page_address(page) ({ if (PageHighMem(page)) BUG(); PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT); })
 280 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
 281 #define pte_page(x) (mem_map+pte_pagenr(x))
 282
 283 #define pmd_page(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
 284
 285 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 286
 287 /* to find an entry in a page-table-directory */
 288 #define pgd_offset(mm, address) \
 289 ((mm)->pgd + ((address) >> PGDIR_SHIFT))
 290
 291 /* to find an entry in a kernel page-table-directory */
 292 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 293
 294 /* Find an entry in the second-level page table.. */
 295
 296 #ifdef __LP64__
 297 #define pmd_offset(dir,address) \
 298 ((pmd_t *) pgd_page(*(dir)) + (((address)>>PMD_SHIFT) & (PTRS_PER_PMD-1)))
 299 #else
 300 #define pmd_offset(dir,addr) ((pmd_t *) dir)
 301 #endif
 302
 303 /* Find an entry in the third-level page table.. */
 304 #define pte_offset(pmd, address) \
 305 ((pte_t *) pmd_page(*(pmd)) + (((address)>>PAGE_SHIFT) & (PTRS_PER_PTE-1)))
 306
 307 extern void paging_init (void);
 308
 309 extern inline void update_mmu_cache(struct vm_area_struct * vma,
 310         unsigned long address, pte_t pte)
 311 {
 312 }
 313
 314 /* Encode and de-code a swap entry */
 315
 316 #define SWP_TYPE(x)                     ((x).val & 0x3f)
 317 #define SWP_OFFSET(x)                   ( (((x).val >> 6) &  0x7) | \
 318                                           (((x).val >> 7) & ~0x7) )
 319 #define SWP_ENTRY(type, offset)         ((swp_entry_t) { (type) | \
 320                                             ((offset &  0x7) << 6) | \
 321                                             ((offset & ~0x7) << 7) })
 322 #define pte_to_swp_entry(pte)           ((swp_entry_t) { pte_val(pte) })
 323 #define swp_entry_to_pte(x)             ((pte_t) { (x).val })
 324
 325 #define module_map      vmalloc
 326 #define module_unmap    vfree
 327
 328 #include <asm-generic/pgtable.h>
 329
 330 #endif /* !__ASSEMBLY__ */
 331
 332 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 333 #define PageSkip(page)          (0)
 334
 335 #define io_remap_page_range remap_page_range
 336
 337 #endif /* _PARISC_PAGE_H */