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 #ifndef __ASSEMBLY__
   9 #include <linux/stddef.h>
  10 #include <asm/tlbflush.h>
  11 #endif /* __ASSEMBLY__ */
  12
  13 #ifdef CONFIG_PPC_64K_PAGES
  14 #include <asm/pgtable-64k.h>
  15 #else
  16 #include <asm/pgtable-4k.h>
  17 #endif
  18
  19 #define FIRST_USER_ADDRESS      0
  20
  21 /*
  22  * Size of EA range mapped by our pagetables.
  23  */
  24 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
  25                             PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
  26 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
  27
  28 #if TASK_SIZE_USER64 > PGTABLE_RANGE
  29 #error TASK_SIZE_USER64 exceeds pagetable range
  30 #endif
  31
  32 #if TASK_SIZE_USER64 > (1UL << (USER_ESID_BITS + SID_SHIFT))
  33 #error TASK_SIZE_USER64 exceeds user VSID range
  34 #endif
  35
  36
  37 /*
  38  * Define the address range of the vmalloc VM area.
  39  */
  40 #define VMALLOC_START ASM_CONST(0xD000000000000000)
  41 #define VMALLOC_SIZE  (PGTABLE_RANGE >> 1)
  42 #define VMALLOC_END   (VMALLOC_START + VMALLOC_SIZE)
  43
  44 /*
  45  * Define the address ranges for MMIO and IO space :
  46  *
  47  *  ISA_IO_BASE = VMALLOC_END, 64K reserved area
  48  *  PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
  49  * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
  50  */
  51 #define FULL_IO_SIZE    0x80000000ul
  52 #define  ISA_IO_BASE    (VMALLOC_END)
  53 #define  ISA_IO_END     (VMALLOC_END + 0x10000ul)
  54 #define  PHB_IO_BASE    (ISA_IO_END)
  55 #define  PHB_IO_END     (VMALLOC_END + FULL_IO_SIZE)
  56 #define IOREMAP_BASE    (PHB_IO_END)
  57 #define IOREMAP_END     (VMALLOC_START + PGTABLE_RANGE)
  58
  59 /*
  60  * Region IDs
  61  */
  62 #define REGION_SHIFT            60UL
  63 #define REGION_MASK             (0xfUL << REGION_SHIFT)
  64 #define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
  65
  66 #define VMALLOC_REGION_ID       (REGION_ID(VMALLOC_START))
  67 #define KERNEL_REGION_ID        (REGION_ID(PAGE_OFFSET))
  68 #define VMEMMAP_REGION_ID       (0xfUL)
  69 #define USER_REGION_ID          (0UL)
  70
  71 /*
  72  * Defines the address of the vmemap area, in its own region
  73  */
  74 #define VMEMMAP_BASE            (VMEMMAP_REGION_ID << REGION_SHIFT)
  75 #define vmemmap                 ((struct page *)VMEMMAP_BASE)
  76
  77
  78 /*
  79  * Common bits in a linux-style PTE.  These match the bits in the
  80  * (hardware-defined) PowerPC PTE as closely as possible. Additional
  81  * bits may be defined in pgtable-*.h
  82  */
  83 #define _PAGE_PRESENT   0x0001 /* software: pte contains a translation */
  84 #define _PAGE_USER      0x0002 /* matches one of the PP bits */
  85 #define _PAGE_FILE      0x0002 /* (!present only) software: pte holds file offset */
  86 #define _PAGE_EXEC      0x0004 /* No execute on POWER4 and newer (we invert) */
  87 #define _PAGE_GUARDED   0x0008
  88 #define _PAGE_COHERENT  0x0010 /* M: enforce memory coherence (SMP systems) */
  89 #define _PAGE_NO_CACHE  0x0020 /* I: cache inhibit */
  90 #define _PAGE_WRITETHRU 0x0040 /* W: cache write-through */
  91 #define _PAGE_DIRTY     0x0080 /* C: page changed */
  92 #define _PAGE_ACCESSED  0x0100 /* R: page referenced */
  93 #define _PAGE_RW        0x0200 /* software: user write access allowed */
  94 #define _PAGE_BUSY      0x0800 /* software: PTE & hash are busy */
  95
  96 /* Strong Access Ordering */
  97 #define _PAGE_SAO       (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT)
  98
  99 #define _PAGE_BASE      (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
 100
 101 #define _PAGE_WRENABLE  (_PAGE_RW | _PAGE_DIRTY)
 102
 103 /* __pgprot defined in arch/powerpc/include/asm/page.h */
 104 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
 105
 106 #define PAGE_SHARED     __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER)
 107 #define PAGE_SHARED_X   __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER | _PAGE_EXEC)
 108 #define PAGE_COPY       __pgprot(_PAGE_BASE | _PAGE_USER)
 109 #define PAGE_COPY_X     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
 110 #define PAGE_READONLY   __pgprot(_PAGE_BASE | _PAGE_USER)
 111 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
 112 #define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_WRENABLE)
 113 #define PAGE_KERNEL_CI  __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
 114                                _PAGE_WRENABLE | _PAGE_NO_CACHE | _PAGE_GUARDED)
 115 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_EXEC)
 116
 117 #define PAGE_AGP        __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_NO_CACHE)
 118 #define HAVE_PAGE_AGP
 119
 120 #define PAGE_PROT_BITS  (_PAGE_GUARDED | _PAGE_COHERENT | \
 121                          _PAGE_NO_CACHE | _PAGE_WRITETHRU |             \
 122                          _PAGE_4K_PFN | _PAGE_RW | _PAGE_USER |         \
 123                          _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_EXEC)
 124 /* PTEIDX nibble */
 125 #define _PTEIDX_SECONDARY       0x8
 126 #define _PTEIDX_GROUP_IX        0x7
 127
 128
 129 /*
 130  * POWER4 and newer have per page execute protection, older chips can only
 131  * do this on a segment (256MB) basis.
 132  *
 133  * Also, write permissions imply read permissions.
 134  * This is the closest we can get..
 135  *
 136  * Note due to the way vm flags are laid out, the bits are XWR
 137  */
 138 #define __P000  PAGE_NONE
 139 #define __P001  PAGE_READONLY
 140 #define __P010  PAGE_COPY
 141 #define __P011  PAGE_COPY
 142 #define __P100  PAGE_READONLY_X
 143 #define __P101  PAGE_READONLY_X
 144 #define __P110  PAGE_COPY_X
 145 #define __P111  PAGE_COPY_X
 146
 147 #define __S000  PAGE_NONE
 148 #define __S001  PAGE_READONLY
 149 #define __S010  PAGE_SHARED
 150 #define __S011  PAGE_SHARED
 151 #define __S100  PAGE_READONLY_X
 152 #define __S101  PAGE_READONLY_X
 153 #define __S110  PAGE_SHARED_X
 154 #define __S111  PAGE_SHARED_X
 155
 156 #ifdef CONFIG_PPC_MM_SLICES
 157 #define HAVE_ARCH_UNMAPPED_AREA
 158 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 159 #endif /* CONFIG_PPC_MM_SLICES */
 160
 161 #ifndef __ASSEMBLY__
 162
 163 /*
 164  * Conversion functions: convert a page and protection to a page entry,
 165  * and a page entry and page directory to the page they refer to.
 166  *
 167  * mk_pte takes a (struct page *) as input
 168  */
 169 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 170
 171 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
 172 {
 173         pte_t pte;
 174
 175
 176         pte_val(pte) = (pfn << PTE_RPN_SHIFT) | pgprot_val(pgprot);
 177         return pte;
 178 }
 179
 180 #define pte_modify(_pte, newprot) \
 181   (__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
 182
 183 #define pte_none(pte)           ((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
 184 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 185
 186 /* pte_clear moved to later in this file */
 187
 188 #define pte_pfn(x)              ((unsigned long)((pte_val(x)>>PTE_RPN_SHIFT)))
 189 #define pte_page(x)             pfn_to_page(pte_pfn(x))
 190
 191 #define PMD_BAD_BITS            (PTE_TABLE_SIZE-1)
 192 #define PUD_BAD_BITS            (PMD_TABLE_SIZE-1)
 193
 194 #define pmd_set(pmdp, pmdval)   (pmd_val(*(pmdp)) = (pmdval))
 195 #define pmd_none(pmd)           (!pmd_val(pmd))
 196 #define pmd_bad(pmd)            (!is_kernel_addr(pmd_val(pmd)) \
 197                                  || (pmd_val(pmd) & PMD_BAD_BITS))
 198 #define pmd_present(pmd)        (pmd_val(pmd) != 0)
 199 #define pmd_clear(pmdp)         (pmd_val(*(pmdp)) = 0)
 200 #define pmd_page_vaddr(pmd)     (pmd_val(pmd) & ~PMD_MASKED_BITS)
 201 #define pmd_page(pmd)           virt_to_page(pmd_page_vaddr(pmd))
 202
 203 #define pud_set(pudp, pudval)   (pud_val(*(pudp)) = (pudval))
 204 #define pud_none(pud)           (!pud_val(pud))
 205 #define pud_bad(pud)            (!is_kernel_addr(pud_val(pud)) \
 206                                  || (pud_val(pud) & PUD_BAD_BITS))
 207 #define pud_present(pud)        (pud_val(pud) != 0)
 208 #define pud_clear(pudp)         (pud_val(*(pudp)) = 0)
 209 #define pud_page_vaddr(pud)     (pud_val(pud) & ~PUD_MASKED_BITS)
 210 #define pud_page(pud)           virt_to_page(pud_page_vaddr(pud))
 211
 212 #define pgd_set(pgdp, pudp)     ({pgd_val(*(pgdp)) = (unsigned long)(pudp);})
 213
 214 /*
 215  * Find an entry in a page-table-directory.  We combine the address region
 216  * (the high order N bits) and the pgd portion of the address.
 217  */
 218 /* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */
 219 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x1ff)
 220
 221 #define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
 222
 223 #define pmd_offset(pudp,addr) \
 224   (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
 225
 226 #define pte_offset_kernel(dir,addr) \
 227   (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
 228
 229 #define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 230 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
 231 #define pte_unmap(pte)                  do { } while(0)
 232 #define pte_unmap_nested(pte)           do { } while(0)
 233
 234 /* to find an entry in a kernel page-table-directory */
 235 /* This now only contains the vmalloc pages */
 236 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 237
 238 /*
 239  * The following only work if pte_present() is true.
 240  * Undefined behaviour if not..
 241  */
 242 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;}
 243 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;}
 244 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;}
 245 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE;}
 246 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
 247
 248 static inline pte_t pte_wrprotect(pte_t pte) {
 249         pte_val(pte) &= ~(_PAGE_RW); return pte; }
 250 static inline pte_t pte_mkclean(pte_t pte) {
 251         pte_val(pte) &= ~(_PAGE_DIRTY); return pte; }
 252 static inline pte_t pte_mkold(pte_t pte) {
 253         pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
 254 static inline pte_t pte_mkwrite(pte_t pte) {
 255         pte_val(pte) |= _PAGE_RW; return pte; }
 256 static inline pte_t pte_mkdirty(pte_t pte) {
 257         pte_val(pte) |= _PAGE_DIRTY; return pte; }
 258 static inline pte_t pte_mkyoung(pte_t pte) {
 259         pte_val(pte) |= _PAGE_ACCESSED; return pte; }
 260 static inline pte_t pte_mkhuge(pte_t pte) {
 261         return pte; }
 262 static inline pte_t pte_mkspecial(pte_t pte) {
 263         pte_val(pte) |= _PAGE_SPECIAL; return pte; }
 264 static inline pgprot_t pte_pgprot(pte_t pte)
 265 {
 266         return __pgprot(pte_val(pte) & PAGE_PROT_BITS);
 267 }
 268
 269 /* Atomic PTE updates */
 270 static inline unsigned long pte_update(struct mm_struct *mm,
 271                                        unsigned long addr,
 272                                        pte_t *ptep, unsigned long clr,
 273                                        int huge)
 274 {
 275         unsigned long old, tmp;
 276
 277         __asm__ __volatile__(
 278         "1:     ldarx   %0,0,%3         # pte_update\n\
 279         andi.   %1,%0,%6\n\
 280         bne-    1b \n\
 281         andc    %1,%0,%4 \n\
 282         stdcx.  %1,0,%3 \n\
 283         bne-    1b"
 284         : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
 285         : "r" (ptep), "r" (clr), "m" (*ptep), "i" (_PAGE_BUSY)
 286         : "cc" );
 287
 288         if (old & _PAGE_HASHPTE)
 289                 hpte_need_flush(mm, addr, ptep, old, huge);
 290         return old;
 291 }
 292
 293 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
 294                                               unsigned long addr, pte_t *ptep)
 295 {
 296         unsigned long old;
 297
 298         if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
 299                 return 0;
 300         old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0);
 301         return (old & _PAGE_ACCESSED) != 0;
 302 }
 303 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 304 #define ptep_test_and_clear_young(__vma, __addr, __ptep)                   \
 305 ({                                                                         \
 306         int __r;                                                           \
 307         __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
 308         __r;                                                               \
 309 })
 310
 311 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 312 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 313                                       pte_t *ptep)
 314 {
 315         unsigned long old;
 316
 317         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 318                 return;
 319         old = pte_update(mm, addr, ptep, _PAGE_RW, 0);
 320 }
 321
 322 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 323                                            unsigned long addr, pte_t *ptep)
 324 {
 325         unsigned long old;
 326
 327         if ((pte_val(*ptep) & _PAGE_RW) == 0)
 328                 return;
 329         old = pte_update(mm, addr, ptep, _PAGE_RW, 1);
 330 }
 331
 332 /*
 333  * We currently remove entries from the hashtable regardless of whether
 334  * the entry was young or dirty. The generic routines only flush if the
 335  * entry was young or dirty which is not good enough.
 336  *
 337  * We should be more intelligent about this but for the moment we override
 338  * these functions and force a tlb flush unconditionally
 339  */
 340 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 341 #define ptep_clear_flush_young(__vma, __address, __ptep)                \
 342 ({                                                                      \
 343         int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
 344                                                   __ptep);              \
 345         __young;                                                        \
 346 })
 347
 348 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 349 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 350                                        unsigned long addr, pte_t *ptep)
 351 {
 352         unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0);
 353         return __pte(old);
 354 }
 355
 356 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 357                              pte_t * ptep)
 358 {
 359         pte_update(mm, addr, ptep, ~0UL, 0);
 360 }
 361
 362 /*
 363  * set_pte stores a linux PTE into the linux page table.
 364  */
 365 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 366                               pte_t *ptep, pte_t pte)
 367 {
 368         if (pte_present(*ptep))
 369                 pte_clear(mm, addr, ptep);
 370         pte = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
 371         *ptep = pte;
 372 }
 373
 374 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
 375  * function doesn't need to flush the hash entry
 376  */
 377 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 378 static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty)
 379 {
 380         unsigned long bits = pte_val(entry) &
 381                 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
 382         unsigned long old, tmp;
 383
 384         __asm__ __volatile__(
 385         "1:     ldarx   %0,0,%4\n\
 386                 andi.   %1,%0,%6\n\
 387                 bne-    1b \n\
 388                 or      %0,%3,%0\n\
 389                 stdcx.  %0,0,%4\n\
 390                 bne-    1b"
 391         :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
 392         :"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
 393         :"cc");
 394 }
 395 #define  ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 396 ({                                                                         \
 397         int __changed = !pte_same(*(__ptep), __entry);                     \
 398         if (__changed) {                                                   \
 399                 __ptep_set_access_flags(__ptep, __entry, __dirty);         \
 400                 flush_tlb_page_nohash(__vma, __address);                   \
 401         }                                                                  \
 402         __changed;                                                         \
 403 })
 404
 405 #define __HAVE_ARCH_PTE_SAME
 406 #define pte_same(A,B)   (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
 407
 408 #define pte_ERROR(e) \
 409         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 410 #define pmd_ERROR(e) \
 411         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 412 #define pgd_ERROR(e) \
 413         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 414
 415 /* Encode and de-code a swap entry */
 416 #define __swp_type(entry)       (((entry).val >> 1) & 0x3f)
 417 #define __swp_offset(entry)     ((entry).val >> 8)
 418 #define __swp_entry(type, offset) ((swp_entry_t){((type)<< 1)|((offset)<<8)})
 419 #define __pte_to_swp_entry(pte) ((swp_entry_t){pte_val(pte) >> PTE_RPN_SHIFT})
 420 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val << PTE_RPN_SHIFT })
 421 #define pte_to_pgoff(pte)       (pte_val(pte) >> PTE_RPN_SHIFT)
 422 #define pgoff_to_pte(off)       ((pte_t) {((off) << PTE_RPN_SHIFT)|_PAGE_FILE})
 423 #define PTE_FILE_MAX_BITS       (BITS_PER_LONG - PTE_RPN_SHIFT)
 424
 425 void pgtable_cache_init(void);
 426
 427 /*
 428  * find_linux_pte returns the address of a linux pte for a given
 429  * effective address and directory.  If not found, it returns zero.
 430  */static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea)
 431 {
 432         pgd_t *pg;
 433         pud_t *pu;
 434         pmd_t *pm;
 435         pte_t *pt = NULL;
 436
 437         pg = pgdir + pgd_index(ea);
 438         if (!pgd_none(*pg)) {
 439                 pu = pud_offset(pg, ea);
 440                 if (!pud_none(*pu)) {
 441                         pm = pmd_offset(pu, ea);
 442                         if (pmd_present(*pm))
 443                                 pt = pte_offset_kernel(pm, ea);
 444                 }
 445         }
 446         return pt;
 447 }
 448
 449 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long address);
 450
 451 #endif /* __ASSEMBLY__ */
 452
 453 #endif /* _ASM_POWERPC_PGTABLE_PPC64_H_ */