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 /* Some sanity checking */
  25 #if TASK_SIZE_USER64 > PGTABLE_RANGE
  26 #error TASK_SIZE_USER64 exceeds pagetable range
  27 #endif
  28
  29 #ifdef CONFIG_PPC_STD_MMU_64
  30 #if TASK_SIZE_USER64 > (1UL << (USER_ESID_BITS + SID_SHIFT))
  31 #error TASK_SIZE_USER64 exceeds user VSID range
  32 #endif
  33 #endif
  34
  35 /*
  36  * Define the address range of the kernel non-linear virtual area
  37  */
  38
  39 #ifdef CONFIG_PPC_BOOK3E
  40 #define KERN_VIRT_START ASM_CONST(0x8000000000000000)
  41 #else
  42 #define KERN_VIRT_START ASM_CONST(0xD000000000000000)
  43 #endif
  44 #define KERN_VIRT_SIZE  PGTABLE_RANGE
  45
  46 /*
  47  * The vmalloc space starts at the beginning of that region, and
  48  * occupies half of it on hash CPUs and a quarter of it on Book3E
  49  * (we keep a quarter for the virtual memmap)
  50  */
  51 #define VMALLOC_START   KERN_VIRT_START
  52 #ifdef CONFIG_PPC_BOOK3E
  53 #define VMALLOC_SIZE    (KERN_VIRT_SIZE >> 2)
  54 #else
  55 #define VMALLOC_SIZE    (KERN_VIRT_SIZE >> 1)
  56 #endif
  57 #define VMALLOC_END     (VMALLOC_START + VMALLOC_SIZE)
  58
  59 /*
  60  * The second half of the kernel virtual space is used for IO mappings,
  61  * it's itself carved into the PIO region (ISA and PHB IO space) and
  62  * the ioremap space
  63  *
  64  *  ISA_IO_BASE = KERN_IO_START, 64K reserved area
  65  *  PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
  66  * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
  67  */
  68 #define KERN_IO_START   (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
  69 #define FULL_IO_SIZE    0x80000000ul
  70 #define  ISA_IO_BASE    (KERN_IO_START)
  71 #define  ISA_IO_END     (KERN_IO_START + 0x10000ul)
  72 #define  PHB_IO_BASE    (ISA_IO_END)
  73 #define  PHB_IO_END     (KERN_IO_START + FULL_IO_SIZE)
  74 #define IOREMAP_BASE    (PHB_IO_END)
  75 #define IOREMAP_END     (KERN_VIRT_START + KERN_VIRT_SIZE)
  76
  77
  78 /*
  79  * Region IDs
  80  */
  81 #define REGION_SHIFT            60UL
  82 #define REGION_MASK             (0xfUL << REGION_SHIFT)
  83 #define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
  84
  85 #define VMALLOC_REGION_ID       (REGION_ID(VMALLOC_START))
  86 #define KERNEL_REGION_ID        (REGION_ID(PAGE_OFFSET))
  87 #define VMEMMAP_REGION_ID       (0xfUL) /* Server only */
  88 #define USER_REGION_ID          (0UL)
  89
  90 /*
  91  * Defines the address of the vmemap area, in its own region on
  92  * hash table CPUs and after the vmalloc space on Book3E
  93  */
  94 #ifdef CONFIG_PPC_BOOK3E
  95 #define VMEMMAP_BASE            VMALLOC_END
  96 #define VMEMMAP_END             KERN_IO_START
  97 #else
  98 #define VMEMMAP_BASE            (VMEMMAP_REGION_ID << REGION_SHIFT)
  99 #endif
 100 #define vmemmap                 ((struct page *)VMEMMAP_BASE)
 101
 102
 103 /*
 104  * Include the PTE bits definitions
 105  */
 106 #ifdef CONFIG_PPC_BOOK3S
 107 #include <asm/pte-hash64.h>
 108 #else
 109 #include <asm/pte-book3e.h>
 110 #endif
 111 #include <asm/pte-common.h>
 112
 113 #ifdef CONFIG_PPC_MM_SLICES
 114 #define HAVE_ARCH_UNMAPPED_AREA
 115 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 116 #endif /* CONFIG_PPC_MM_SLICES */
 117
 118 #ifndef __ASSEMBLY__
 119
 120 #include <linux/stddef.h>
 121 #include <asm/tlbflush.h>
 122
 123 /*
 124  * This is the default implementation of various PTE accessors, it's
 125  * used in all cases except Book3S with 64K pages where we have a
 126  * concept of sub-pages
 127  */
 128 #ifndef __real_pte
 129
 130 #ifdef STRICT_MM_TYPECHECKS
 131 #define __real_pte(e,p)         ((real_pte_t){(e)})
 132 #define __rpte_to_pte(r)        ((r).pte)
 133 #else
 134 #define __real_pte(e,p)         (e)
 135 #define __rpte_to_pte(r)        (__pte(r))
 136 #endif
 137 #define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> 12)
 138
 139 #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift)       \
 140         do {                                                             \
 141                 index = 0;                                               \
 142                 shift = mmu_psize_defs[psize].shift;                     \
 143
 144 #define pte_iterate_hashed_end() } while(0)
 145
 146 #ifdef CONFIG_PPC_HAS_HASH_64K
 147 #define pte_pagesize_index(mm, addr, pte)       get_slice_psize(mm, addr)
 148 #else
 149 #define pte_pagesize_index(mm, addr, pte)       MMU_PAGE_4K
 150 #endif
 151
 152 #endif /* __real_pte */
 153
 154
 155 /* pte_clear moved to later in this file */
 156
 157 #define PMD_BAD_BITS            (PTE_TABLE_SIZE-1)
 158 #define PUD_BAD_BITS            (PMD_TABLE_SIZE-1)
 159
 160 #define pmd_set(pmdp, pmdval)   (pmd_val(*(pmdp)) = (pmdval))
 161 #define pmd_none(pmd)           (!pmd_val(pmd))
 162 #define pmd_bad(pmd)            (!is_kernel_addr(pmd_val(pmd)) \
 163                                  || (pmd_val(pmd) & PMD_BAD_BITS))
 164 #define pmd_present(pmd)        (pmd_val(pmd) != 0)
 165 #define pmd_clear(pmdp)         (pmd_val(*(pmdp)) = 0)
 166 #define pmd_page_vaddr(pmd)     (pmd_val(pmd) & ~PMD_MASKED_BITS)
 167 #define pmd_page(pmd)           virt_to_page(pmd_page_vaddr(pmd))
 168
 169 #define pud_set(pudp, pudval)   (pud_val(*(pudp)) = (pudval))
 170 #define pud_none(pud)           (!pud_val(pud))
 171 #define pud_bad(pud)            (!is_kernel_addr(pud_val(pud)) \
 172                                  || (pud_val(pud) & PUD_BAD_BITS))
 173 #define pud_present(pud)        (pud_val(pud) != 0)
 174 #define pud_clear(pudp)         (pud_val(*(pudp)) = 0)
 175 #define pud_page_vaddr(pud)     (pud_val(pud) & ~PUD_MASKED_BITS)
 176 #define pud_page(pud)           virt_to_page(pud_page_vaddr(pud))
 177
 178 #define pgd_set(pgdp, pudp)     ({pgd_val(*(pgdp)) = (unsigned long)(pudp);})
 179
 180 /*
 181  * Find an entry in a page-table-directory.  We combine the address region
 182  * (the high order N bits) and the pgd portion of the address.
 183  */
 184 /* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */
 185 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x1ff)
 186
 187 #define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
 188
 189 #define pmd_offset(pudp,addr) \
 190   (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
 191
 192 #define pte_offset_kernel(dir,addr) \
 193   (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 194
 195 #define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 196 #define pte_unmap(pte)                  do { } while(0)
 197
 198 /* to find an entry in a kernel page-table-directory */
 199 /* This now only contains the vmalloc pages */
 200 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 201
 202
 203 /* Atomic PTE updates */
 204 static inline unsigned long pte_update(struct mm_struct *mm,
 205                                        unsigned long addr,
 206                                        pte_t *ptep, unsigned long clr,
 207                                        int huge)
 208 {
 209 #ifdef PTE_ATOMIC_UPDATES
 210         unsigned long old, tmp;
 211
 212         __asm__ __volatile__(
 213         "1:     ldarx   %0,0,%3         # pte_update\n\
 214         andi.   %1,%0,%6\n\
 215         bne-    1b \n\
 216         andc    %1,%0,%4 \n\
 217         stdcx.  %1,0,%3 \n\
 218         bne-    1b"
 219         : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
 220         : "r" (ptep), "r" (clr), "m" (*ptep), "i" (_PAGE_BUSY)
 221         : "cc" );
 222 #else
 223         unsigned long old = pte_val(*ptep);
 224         *ptep = __pte(old & ~clr);
 225 #endif
 226         /* huge pages use the old page table lock */
 227         if (!huge)
 228                 assert_pte_locked(mm, addr);
 229
 230 #ifdef CONFIG_PPC_STD_MMU_64
 231         if (old & _PAGE_HASHPTE)
 232                 hpte_need_flush(mm, addr, ptep, old, huge);
 233 #endif
 234
 235         return old;
 236 }
 237
 238 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
 239                                               unsigned long addr, pte_t *ptep)
 240 {
 241         unsigned long old;
 242
 243         if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
 244                 return 0;
 245         old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0);
 246         return (old & _PAGE_ACCESSED) != 0;
 247 }
 248 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 249 #define ptep_test_and_clear_young(__vma, __addr, __ptep)                   \
 250 ({                                                                         \
 251         int __r;                                                           \
 252         __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
 253         __r;                                                               \
 254 })
 255
 256 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 257 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 258                                       pte_t *ptep)
 259 {
 260
 261         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 262                 return;
 263
 264         pte_update(mm, addr, ptep, _PAGE_RW, 0);
 265 }
 266
 267 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 268                                            unsigned long addr, pte_t *ptep)
 269 {
 270         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 271                 return;
 272
 273         pte_update(mm, addr, ptep, _PAGE_RW, 1);
 274 }
 275
 276 /*
 277  * We currently remove entries from the hashtable regardless of whether
 278  * the entry was young or dirty. The generic routines only flush if the
 279  * entry was young or dirty which is not good enough.
 280  *
 281  * We should be more intelligent about this but for the moment we override
 282  * these functions and force a tlb flush unconditionally
 283  */
 284 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 285 #define ptep_clear_flush_young(__vma, __address, __ptep)                \
 286 ({                                                                      \
 287         int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
 288                                                   __ptep);              \
 289         __young;                                                        \
 290 })
 291
 292 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 293 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 294                                        unsigned long addr, pte_t *ptep)
 295 {
 296         unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0);
 297         return __pte(old);
 298 }
 299
 300 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 301                              pte_t * ptep)
 302 {
 303         pte_update(mm, addr, ptep, ~0UL, 0);
 304 }
 305
 306
 307 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
 308  * function doesn't need to flush the hash entry
 309  */
 310 static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 311 {
 312         unsigned long bits = pte_val(entry) &
 313                 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
 314
 315 #ifdef PTE_ATOMIC_UPDATES
 316         unsigned long old, tmp;
 317
 318         __asm__ __volatile__(
 319         "1:     ldarx   %0,0,%4\n\
 320                 andi.   %1,%0,%6\n\
 321                 bne-    1b \n\
 322                 or      %0,%3,%0\n\
 323                 stdcx.  %0,0,%4\n\
 324                 bne-    1b"
 325         :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
 326         :"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
 327         :"cc");
 328 #else
 329         unsigned long old = pte_val(*ptep);
 330         *ptep = __pte(old | bits);
 331 #endif
 332 }
 333
 334 #define __HAVE_ARCH_PTE_SAME
 335 #define pte_same(A,B)   (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
 336
 337 #define pte_ERROR(e) \
 338         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 339 #define pmd_ERROR(e) \
 340         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 341 #define pgd_ERROR(e) \
 342         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 343
 344 /* Encode and de-code a swap entry */
 345 #define __swp_type(entry)       (((entry).val >> 1) & 0x3f)
 346 #define __swp_offset(entry)     ((entry).val >> 8)
 347 #define __swp_entry(type, offset) ((swp_entry_t){((type)<< 1)|((offset)<<8)})
 348 #define __pte_to_swp_entry(pte) ((swp_entry_t){pte_val(pte) >> PTE_RPN_SHIFT})
 349 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val << PTE_RPN_SHIFT })
 350 #define pte_to_pgoff(pte)       (pte_val(pte) >> PTE_RPN_SHIFT)
 351 #define pgoff_to_pte(off)       ((pte_t) {((off) << PTE_RPN_SHIFT)|_PAGE_FILE})
 352 #define PTE_FILE_MAX_BITS       (BITS_PER_LONG - PTE_RPN_SHIFT)
 353
 354 void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
 355 void pgtable_cache_init(void);
 356
 357 /*
 358  * find_linux_pte returns the address of a linux pte for a given
 359  * effective address and directory.  If not found, it returns zero.
 360  */
 361 static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea)
 362 {
 363         pgd_t *pg;
 364         pud_t *pu;
 365         pmd_t *pm;
 366         pte_t *pt = NULL;
 367
 368         pg = pgdir + pgd_index(ea);
 369         if (!pgd_none(*pg)) {
 370                 pu = pud_offset(pg, ea);
 371                 if (!pud_none(*pu)) {
 372                         pm = pmd_offset(pu, ea);
 373                         if (pmd_present(*pm))
 374                                 pt = pte_offset_kernel(pm, ea);
 375                 }
 376         }
 377         return pt;
 378 }
 379
 380 #ifdef CONFIG_HUGETLB_PAGE
 381 pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
 382                                  unsigned *shift);
 383 #else
 384 static inline pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
 385                                                unsigned *shift)
 386 {
 387         if (shift)
 388                 *shift = 0;
 389         return find_linux_pte(pgdir, ea);
 390 }
 391 #endif /* !CONFIG_HUGETLB_PAGE */
 392
 393 #endif /* __ASSEMBLY__ */
 394
 395 #endif /* _ASM_POWERPC_PGTABLE_PPC64_H_ */