LXR linux/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 */
 204static 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
 238static 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
 257static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
 258                                      pte_t *ptep)
 259{
 260        unsigned long old;
 261
 262        if ((pte_val(*ptep) & _PAGE_RW) == 0)
 263                return;
 264        old = pte_update(mm, addr, ptep, _PAGE_RW, 0);
 265}
 266
 267static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 268                                           unsigned long addr, pte_t *ptep)
 269{
 270        unsigned long old;
 271
 272        if ((pte_val(*ptep) & _PAGE_RW) == 0)
 273                return;
 274        old = pte_update(mm, addr, ptep, _PAGE_RW, 1);
 275}
 276
 277/*
 278 * We currently remove entries from the hashtable regardless of whether
 279 * the entry was young or dirty. The generic routines only flush if the
 280 * entry was young or dirty which is not good enough.
 281 *
 282 * We should be more intelligent about this but for the moment we override
 283 * these functions and force a tlb flush unconditionally
 284 */
 285#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 286#define ptep_clear_flush_young(__vma, __address, __ptep)                \
 287({                                                                      \
 288        int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
 289                                                  __ptep);              \
 290        __young;                                                        \
 291})
 292
 293#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 294static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 295                                       unsigned long addr, pte_t *ptep)
 296{
 297        unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0);
 298        return __pte(old);
 299}
 300
 301static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 302                             pte_t * ptep)
 303{
 304        pte_update(mm, addr, ptep, ~0UL, 0);
 305}
 306
 307
 308/* Set the dirty and/or accessed bits atomically in a linux PTE, this
 309 * function doesn't need to flush the hash entry
 310 */
 311static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 312{
 313        unsigned long bits = pte_val(entry) &
 314                (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
 315
 316#ifdef PTE_ATOMIC_UPDATES
 317        unsigned long old, tmp;
 318
 319        __asm__ __volatile__(
 320        "1:     ldarx   %0,0,%4\n\
 321                andi.   %1,%0,%6\n\
 322                bne-    1b \n\
 323                or      %0,%3,%0\n\
 324                stdcx.  %0,0,%4\n\
 325                bne-    1b"
 326        :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
 327        :"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
 328        :"cc");
 329#else
 330        unsigned long old = pte_val(*ptep);
 331        *ptep = __pte(old | bits);
 332#endif
 333}
 334
 335#define __HAVE_ARCH_PTE_SAME
 336#define pte_same(A,B)   (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
 337
 338#define pte_ERROR(e) \
 339        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 340#define pmd_ERROR(e) \
 341        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 342#define pgd_ERROR(e) \
 343        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 344
 345/* Encode and de-code a swap entry */
 346#define __swp_type(entry)       (((entry).val >> 1) & 0x3f)
 347#define __swp_offset(entry)     ((entry).val >> 8)
 348#define __swp_entry(type, offset) ((swp_entry_t){((type)<< 1)|((offset)<<8)})
 349#define __pte_to_swp_entry(pte) ((swp_entry_t){pte_val(pte) >> PTE_RPN_SHIFT})
 350#define __swp_entry_to_pte(x)   ((pte_t) { (x).val << PTE_RPN_SHIFT })
 351#define pte_to_pgoff(pte)       (pte_val(pte) >> PTE_RPN_SHIFT)
 352#define pgoff_to_pte(off)       ((pte_t) {((off) << PTE_RPN_SHIFT)|_PAGE_FILE})
 353#define PTE_FILE_MAX_BITS       (BITS_PER_LONG - PTE_RPN_SHIFT)
 354
 355void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
 356void pgtable_cache_init(void);
 357
 358/*
 359 * find_linux_pte returns the address of a linux pte for a given
 360 * effective address and directory.  If not found, it returns zero.
 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
 381pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
 382                                 unsigned *shift);
 383#else
 384static 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_ */
 396