arch/powerpc/include/asm/pgtable-ppc64.h

   1 #ifndef _ASM_POWERPC_PGTABLE_PPC64_H_
   2 #define _ASM_POWERPC_PGTABLE_PPC64_H_
   3 /*
   4  * This file contains the functions and defines necessary to modify and use
   5  * the ppc64 hashed page table.
   6  */
   7
   8 #ifdef CONFIG_PPC_64K_PAGES
   9 #include <asm/pgtable-ppc64-64k.h>
  10 #else
  11 #include <asm/pgtable-ppc64-4k.h>
  12 #endif
  13
  14 #define FIRST_USER_ADDRESS      0
  15
  16 /*
  17  * Size of EA range mapped by our pagetables.
  18  */
  19 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
  20                             PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
  21 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
  22
  23
  24 /*
  25  * Define the address range of the kernel non-linear virtual area
  26  */
  27
  28 #ifdef CONFIG_PPC_BOOK3E
  29 #define KERN_VIRT_START ASM_CONST(0x8000000000000000)
  30 #else
  31 #define KERN_VIRT_START ASM_CONST(0xD000000000000000)
  32 #endif
  33 #define KERN_VIRT_SIZE  ASM_CONST(0x0000100000000000)
  34
  35 /*
  36  * The vmalloc space starts at the beginning of that region, and
  37  * occupies half of it on hash CPUs and a quarter of it on Book3E
  38  * (we keep a quarter for the virtual memmap)
  39  */
  40 #define VMALLOC_START   KERN_VIRT_START
  41 #ifdef CONFIG_PPC_BOOK3E
  42 #define VMALLOC_SIZE    (KERN_VIRT_SIZE >> 2)
  43 #else
  44 #define VMALLOC_SIZE    (KERN_VIRT_SIZE >> 1)
  45 #endif
  46 #define VMALLOC_END     (VMALLOC_START + VMALLOC_SIZE)
  47
  48 /*
  49  * The second half of the kernel virtual space is used for IO mappings,
  50  * it's itself carved into the PIO region (ISA and PHB IO space) and
  51  * the ioremap space
  52  *
  53  *  ISA_IO_BASE = KERN_IO_START, 64K reserved area
  54  *  PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
  55  * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
  56  */
  57 #define KERN_IO_START   (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
  58 #define FULL_IO_SIZE    0x80000000ul
  59 #define  ISA_IO_BASE    (KERN_IO_START)
  60 #define  ISA_IO_END     (KERN_IO_START + 0x10000ul)
  61 #define  PHB_IO_BASE    (ISA_IO_END)
  62 #define  PHB_IO_END     (KERN_IO_START + FULL_IO_SIZE)
  63 #define IOREMAP_BASE    (PHB_IO_END)
  64 #define IOREMAP_END     (KERN_VIRT_START + KERN_VIRT_SIZE)
  65
  66
  67 /*
  68  * Region IDs
  69  */
  70 #define REGION_SHIFT            60UL
  71 #define REGION_MASK             (0xfUL << REGION_SHIFT)
  72 #define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
  73
  74 #define VMALLOC_REGION_ID       (REGION_ID(VMALLOC_START))
  75 #define KERNEL_REGION_ID        (REGION_ID(PAGE_OFFSET))
  76 #define VMEMMAP_REGION_ID       (0xfUL) /* Server only */
  77 #define USER_REGION_ID          (0UL)
  78
  79 /*
  80  * Defines the address of the vmemap area, in its own region on
  81  * hash table CPUs and after the vmalloc space on Book3E
  82  */
  83 #ifdef CONFIG_PPC_BOOK3E
  84 #define VMEMMAP_BASE            VMALLOC_END
  85 #define VMEMMAP_END             KERN_IO_START
  86 #else
  87 #define VMEMMAP_BASE            (VMEMMAP_REGION_ID << REGION_SHIFT)
  88 #endif
  89 #define vmemmap                 ((struct page *)VMEMMAP_BASE)
  90
  91
  92 /*
  93  * Include the PTE bits definitions
  94  */
  95 #ifdef CONFIG_PPC_BOOK3S
  96 #include <asm/pte-hash64.h>
  97 #else
  98 #include <asm/pte-book3e.h>
  99 #endif
 100 #include <asm/pte-common.h>
 101
 102 #ifdef CONFIG_PPC_MM_SLICES
 103 #define HAVE_ARCH_UNMAPPED_AREA
 104 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 105 #endif /* CONFIG_PPC_MM_SLICES */
 106
 107 #ifndef __ASSEMBLY__
 108
 109 /*
 110  * This is the default implementation of various PTE accessors, it's
 111  * used in all cases except Book3S with 64K pages where we have a
 112  * concept of sub-pages
 113  */
 114 #ifndef __real_pte
 115
 116 #ifdef STRICT_MM_TYPECHECKS
 117 #define __real_pte(e,p)         ((real_pte_t){(e)})
 118 #define __rpte_to_pte(r)        ((r).pte)
 119 #else
 120 #define __real_pte(e,p)         (e)
 121 #define __rpte_to_pte(r)        (__pte(r))
 122 #endif
 123 #define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> 12)
 124
 125 #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift)       \
 126         do {                                                             \
 127                 index = 0;                                               \
 128                 shift = mmu_psize_defs[psize].shift;                     \
 129
 130 #define pte_iterate_hashed_end() } while(0)
 131
 132 #ifdef CONFIG_PPC_HAS_HASH_64K
 133 #define pte_pagesize_index(mm, addr, pte)       get_slice_psize(mm, addr)
 134 #else
 135 #define pte_pagesize_index(mm, addr, pte)       MMU_PAGE_4K
 136 #endif
 137
 138 #endif /* __real_pte */
 139
 140
 141 /* pte_clear moved to later in this file */
 142
 143 #define PMD_BAD_BITS            (PTE_TABLE_SIZE-1)
 144 #define PUD_BAD_BITS            (PMD_TABLE_SIZE-1)
 145
 146 #define pmd_set(pmdp, pmdval)   (pmd_val(*(pmdp)) = (pmdval))
 147 #define pmd_none(pmd)           (!pmd_val(pmd))
 148 #define pmd_bad(pmd)            (!is_kernel_addr(pmd_val(pmd)) \
 149                                  || (pmd_val(pmd) & PMD_BAD_BITS))
 150 #define pmd_present(pmd)        (pmd_val(pmd) != 0)
 151 #define pmd_clear(pmdp)         (pmd_val(*(pmdp)) = 0)
 152 #define pmd_page_vaddr(pmd)     (pmd_val(pmd) & ~PMD_MASKED_BITS)
 153 #define pmd_page(pmd)           virt_to_page(pmd_page_vaddr(pmd))
 154
 155 #define pud_set(pudp, pudval)   (pud_val(*(pudp)) = (pudval))
 156 #define pud_none(pud)           (!pud_val(pud))
 157 #define pud_bad(pud)            (!is_kernel_addr(pud_val(pud)) \
 158                                  || (pud_val(pud) & PUD_BAD_BITS))
 159 #define pud_present(pud)        (pud_val(pud) != 0)
 160 #define pud_clear(pudp)         (pud_val(*(pudp)) = 0)
 161 #define pud_page_vaddr(pud)     (pud_val(pud) & ~PUD_MASKED_BITS)
 162 #define pud_page(pud)           virt_to_page(pud_page_vaddr(pud))
 163
 164 #define pgd_set(pgdp, pudp)     ({pgd_val(*(pgdp)) = (unsigned long)(pudp);})
 165
 166 /*
 167  * Find an entry in a page-table-directory.  We combine the address region
 168  * (the high order N bits) and the pgd portion of the address.
 169  */
 170 /* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */
 171 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x1ff)
 172
 173 #define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
 174
 175 #define pmd_offset(pudp,addr) \
 176   (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
 177
 178 #define pte_offset_kernel(dir,addr) \
 179   (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 180
 181 #define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 182 #define pte_unmap(pte)                  do { } while(0)
 183
 184 /* to find an entry in a kernel page-table-directory */
 185 /* This now only contains the vmalloc pages */
 186 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 187 extern void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
 188                             pte_t *ptep, unsigned long pte, int huge);
 189
 190 /* Atomic PTE updates */
 191 static inline unsigned long pte_update(struct mm_struct *mm,
 192                                        unsigned long addr,
 193                                        pte_t *ptep, unsigned long clr,
 194                                        int huge)
 195 {
 196 #ifdef PTE_ATOMIC_UPDATES
 197         unsigned long old, tmp;
 198
 199         __asm__ __volatile__(
 200         "1:     ldarx   %0,0,%3         # pte_update\n\
 201         andi.   %1,%0,%6\n\
 202         bne-    1b \n\
 203         andc    %1,%0,%4 \n\
 204         stdcx.  %1,0,%3 \n\
 205         bne-    1b"
 206         : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
 207         : "r" (ptep), "r" (clr), "m" (*ptep), "i" (_PAGE_BUSY)
 208         : "cc" );
 209 #else
 210         unsigned long old = pte_val(*ptep);
 211         *ptep = __pte(old & ~clr);
 212 #endif
 213         /* huge pages use the old page table lock */
 214         if (!huge)
 215                 assert_pte_locked(mm, addr);
 216
 217 #ifdef CONFIG_PPC_STD_MMU_64
 218         if (old & _PAGE_HASHPTE)
 219                 hpte_need_flush(mm, addr, ptep, old, huge);
 220 #endif
 221
 222         return old;
 223 }
 224
 225 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
 226                                               unsigned long addr, pte_t *ptep)
 227 {
 228         unsigned long old;
 229
 230         if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
 231                 return 0;
 232         old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0);
 233         return (old & _PAGE_ACCESSED) != 0;
 234 }
 235 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 236 #define ptep_test_and_clear_young(__vma, __addr, __ptep)                   \
 237 ({                                                                         \
 238         int __r;                                                           \
 239         __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
 240         __r;                                                               \
 241 })
 242
 243 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 244 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 245                                       pte_t *ptep)
 246 {
 247
 248         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 249                 return;
 250
 251         pte_update(mm, addr, ptep, _PAGE_RW, 0);
 252 }
 253
 254 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 255                                            unsigned long addr, pte_t *ptep)
 256 {
 257         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 258                 return;
 259
 260         pte_update(mm, addr, ptep, _PAGE_RW, 1);
 261 }
 262
 263 /*
 264  * We currently remove entries from the hashtable regardless of whether
 265  * the entry was young or dirty. The generic routines only flush if the
 266  * entry was young or dirty which is not good enough.
 267  *
 268  * We should be more intelligent about this but for the moment we override
 269  * these functions and force a tlb flush unconditionally
 270  */
 271 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 272 #define ptep_clear_flush_young(__vma, __address, __ptep)                \
 273 ({                                                                      \
 274         int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
 275                                                   __ptep);              \
 276         __young;                                                        \
 277 })
 278
 279 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 280 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 281                                        unsigned long addr, pte_t *ptep)
 282 {
 283         unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0);
 284         return __pte(old);
 285 }
 286
 287 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 288                              pte_t * ptep)
 289 {
 290         pte_update(mm, addr, ptep, ~0UL, 0);
 291 }
 292
 293
 294 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
 295  * function doesn't need to flush the hash entry
 296  */
 297 static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 298 {
 299         unsigned long bits = pte_val(entry) &
 300                 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
 301
 302 #ifdef PTE_ATOMIC_UPDATES
 303         unsigned long old, tmp;
 304
 305         __asm__ __volatile__(
 306         "1:     ldarx   %0,0,%4\n\
 307                 andi.   %1,%0,%6\n\
 308                 bne-    1b \n\
 309                 or      %0,%3,%0\n\
 310                 stdcx.  %0,0,%4\n\
 311                 bne-    1b"
 312         :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
 313         :"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
 314         :"cc");
 315 #else
 316         unsigned long old = pte_val(*ptep);
 317         *ptep = __pte(old | bits);
 318 #endif
 319 }
 320
 321 #define __HAVE_ARCH_PTE_SAME
 322 #define pte_same(A,B)   (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
 323
 324 #define pte_ERROR(e) \
 325         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 326 #define pmd_ERROR(e) \
 327         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 328 #define pgd_ERROR(e) \
 329         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 330
 331 /* Encode and de-code a swap entry */
 332 #define __swp_type(entry)       (((entry).val >> 1) & 0x3f)
 333 #define __swp_offset(entry)     ((entry).val >> 8)
 334 #define __swp_entry(type, offset) ((swp_entry_t){((type)<< 1)|((offset)<<8)})
 335 #define __pte_to_swp_entry(pte) ((swp_entry_t){pte_val(pte) >> PTE_RPN_SHIFT})
 336 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val << PTE_RPN_SHIFT })
 337 #define pte_to_pgoff(pte)       (pte_val(pte) >> PTE_RPN_SHIFT)
 338 #define pgoff_to_pte(off)       ((pte_t) {((off) << PTE_RPN_SHIFT)|_PAGE_FILE})
 339 #define PTE_FILE_MAX_BITS       (BITS_PER_LONG - PTE_RPN_SHIFT)
 340
 341 void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
 342 void pgtable_cache_init(void);
 343
 344 /*
 345  * find_linux_pte returns the address of a linux pte for a given
 346  * effective address and directory.  If not found, it returns zero.
 347  */
 348 static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea)
 349 {
 350         pgd_t *pg;
 351         pud_t *pu;
 352         pmd_t *pm;
 353         pte_t *pt = NULL;
 354
 355         pg = pgdir + pgd_index(ea);
 356         if (!pgd_none(*pg)) {
 357                 pu = pud_offset(pg, ea);
 358                 if (!pud_none(*pu)) {
 359                         pm = pmd_offset(pu, ea);
 360                         if (pmd_present(*pm))
 361                                 pt = pte_offset_kernel(pm, ea);
 362                 }
 363         }
 364         return pt;
 365 }
 366
 367 #ifdef CONFIG_HUGETLB_PAGE
 368 pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
 369                                  unsigned *shift);
 370 #else
 371 static inline pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
 372                                                unsigned *shift)
 373 {
 374         if (shift)
 375                 *shift = 0;
 376         return find_linux_pte(pgdir, ea);
 377 }
 378 #endif /* !CONFIG_HUGETLB_PAGE */
 379
 380 #endif /* __ASSEMBLY__ */
 381
 382 #endif /* _ASM_POWERPC_PGTABLE_PPC64_H_ */