include/asm-x86/pgtable_64.h

   1 #ifndef _X86_64_PGTABLE_H
   2 #define _X86_64_PGTABLE_H
   3
   4 #include <linux/const.h>
   5 #ifndef __ASSEMBLY__
   6
   7 /*
   8  * This file contains the functions and defines necessary to modify and use
   9  * the x86-64 page table tree.
  10  */
  11 #include <asm/processor.h>
  12 #include <linux/bitops.h>
  13 #include <linux/threads.h>
  14 #include <asm/pda.h>
  15
  16 extern pud_t level3_kernel_pgt[512];
  17 extern pud_t level3_ident_pgt[512];
  18 extern pmd_t level2_kernel_pgt[512];
  19 extern pgd_t init_level4_pgt[];
  20
  21 #define swapper_pg_dir init_level4_pgt
  22
  23 extern void paging_init(void);
  24 extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
  25
  26 /*
  27  * ZERO_PAGE is a global shared page that is always zero: used
  28  * for zero-mapped memory areas etc..
  29  */
  30 extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
  31 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  32
  33 #endif /* !__ASSEMBLY__ */
  34
  35 /*
  36  * PGDIR_SHIFT determines what a top-level page table entry can map
  37  */
  38 #define PGDIR_SHIFT     39
  39 #define PTRS_PER_PGD    512
  40
  41 /*
  42  * 3rd level page
  43  */
  44 #define PUD_SHIFT       30
  45 #define PTRS_PER_PUD    512
  46
  47 /*
  48  * PMD_SHIFT determines the size of the area a middle-level
  49  * page table can map
  50  */
  51 #define PMD_SHIFT       21
  52 #define PTRS_PER_PMD    512
  53
  54 /*
  55  * entries per page directory level
  56  */
  57 #define PTRS_PER_PTE    512
  58
  59 #ifndef __ASSEMBLY__
  60
  61 #define pte_ERROR(e) \
  62         printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
  63 #define pmd_ERROR(e) \
  64         printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
  65 #define pud_ERROR(e) \
  66         printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
  67 #define pgd_ERROR(e) \
  68         printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
  69
  70 #define pgd_none(x)     (!pgd_val(x))
  71 #define pud_none(x)     (!pud_val(x))
  72
  73 static inline void set_pte(pte_t *dst, pte_t val)
  74 {
  75         *dst = val;
  76 }
  77 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  78
  79 static inline void set_pmd(pmd_t *dst, pmd_t val)
  80 {
  81         *dst = val;
  82 }
  83
  84 static inline void set_pud(pud_t *dst, pud_t val)
  85 {
  86         *dst = val;
  87 }
  88
  89 static inline void pud_clear (pud_t *pud)
  90 {
  91         set_pud(pud, __pud(0));
  92 }
  93
  94 static inline void set_pgd(pgd_t *dst, pgd_t val)
  95 {
  96         *dst = val;
  97 }
  98
  99 static inline void pgd_clear (pgd_t * pgd)
 100 {
 101         set_pgd(pgd, __pgd(0));
 102 }
 103
 104 #define ptep_get_and_clear(mm,addr,xp)  __pte(xchg(&(xp)->pte, 0))
 105
 106 struct mm_struct;
 107
 108 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
 109 {
 110         pte_t pte;
 111         if (full) {
 112                 pte = *ptep;
 113                 *ptep = __pte(0);
 114         } else {
 115                 pte = ptep_get_and_clear(mm, addr, ptep);
 116         }
 117         return pte;
 118 }
 119
 120 #define pte_same(a, b)          ((a).pte == (b).pte)
 121
 122 #define pte_pgprot(a)   (__pgprot((a).pte & ~PHYSICAL_PAGE_MASK))
 123
 124 #endif /* !__ASSEMBLY__ */
 125
 126 #define PMD_SIZE        (_AC(1,UL) << PMD_SHIFT)
 127 #define PMD_MASK        (~(PMD_SIZE-1))
 128 #define PUD_SIZE        (_AC(1,UL) << PUD_SHIFT)
 129 #define PUD_MASK        (~(PUD_SIZE-1))
 130 #define PGDIR_SIZE      (_AC(1,UL) << PGDIR_SHIFT)
 131 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
 132
 133
 134 #define MAXMEM           _AC(0x3fffffffffff, UL)
 135 #define VMALLOC_START    _AC(0xffffc20000000000, UL)
 136 #define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
 137 #define VMEMMAP_START    _AC(0xffffe20000000000, UL)
 138 #define MODULES_VADDR    _AC(0xffffffff88000000, UL)
 139 #define MODULES_END      _AC(0xfffffffffff00000, UL)
 140 #define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 141
 142 #ifndef __ASSEMBLY__
 143
 144 static inline unsigned long pgd_bad(pgd_t pgd)
 145 {
 146         return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
 147 }
 148
 149 static inline unsigned long pud_bad(pud_t pud)
 150 {
 151         return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
 152 }
 153
 154 static inline unsigned long pmd_bad(pmd_t pmd)
 155 {
 156         return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
 157 }
 158
 159 #define pte_none(x)     (!pte_val(x))
 160 #define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 161 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 162
 163 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this right? */
 164 #define pte_page(x)     pfn_to_page(pte_pfn(x))
 165 #define pte_pfn(x)  ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 166
 167 struct vm_area_struct;
 168
 169 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 170 {
 171         if (!pte_young(*ptep))
 172                 return 0;
 173         return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
 174 }
 175
 176 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 177 {
 178         clear_bit(_PAGE_BIT_RW, &ptep->pte);
 179 }
 180
 181 /*
 182  * Macro to mark a page protection value as "uncacheable".
 183  */
 184 #define pgprot_noncached(prot)  (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
 185
 186
 187 /*
 188  * Conversion functions: convert a page and protection to a page entry,
 189  * and a page entry and page directory to the page they refer to.
 190  */
 191
 192 /*
 193  * Level 4 access.
 194  */
 195 #define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
 196 #define pgd_page(pgd)           (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT))
 197 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 198 #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
 199 #define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
 200 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
 201 #define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
 202
 203 /* PUD - Level3 access */
 204 /* to find an entry in a page-table-directory. */
 205 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
 206 #define pud_page(pud)           (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
 207 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 208 #define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
 209 #define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
 210
 211 /* PMD  - Level 2 access */
 212 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
 213 #define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 214
 215 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 216 #define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
 217                         pmd_index(address))
 218 #define pmd_none(x)     (!pmd_val(x))
 219 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 220 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 221 #define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
 222 #define pmd_pfn(x)  ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 223
 224 #define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 225 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | _PAGE_FILE })
 226 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 227
 228 /* PTE - Level 1 access. */
 229
 230 /* page, protection -> pte */
 231 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 232
 233 #define pte_index(address) \
 234                 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 235 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
 236                         pte_index(address))
 237
 238 /* x86-64 always has all page tables mapped. */
 239 #define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
 240 #define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
 241 #define pte_unmap(pte) /* NOP */
 242 #define pte_unmap_nested(pte) /* NOP */
 243
 244 #define update_mmu_cache(vma,address,pte) do { } while (0)
 245
 246 /* We only update the dirty/accessed state if we set
 247  * the dirty bit by hand in the kernel, since the hardware
 248  * will do the accessed bit for us, and we don't want to
 249  * race with other CPU's that might be updating the dirty
 250  * bit at the same time. */
 251 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 252 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 253 ({                                                                        \
 254         int __changed = !pte_same(*(__ptep), __entry);                    \
 255         if (__changed && __dirty) {                                       \
 256                 set_pte(__ptep, __entry);                                 \
 257                 flush_tlb_page(__vma, __address);                         \
 258         }                                                                 \
 259         __changed;                                                        \
 260 })
 261
 262 /* Encode and de-code a swap entry */
 263 #define __swp_type(x)                   (((x).val >> 1) & 0x3f)
 264 #define __swp_offset(x)                 ((x).val >> 8)
 265 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
 266 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 267 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 268
 269 extern spinlock_t pgd_lock;
 270 extern struct list_head pgd_list;
 271
 272 extern int kern_addr_valid(unsigned long addr);
 273
 274 pte_t *lookup_address(unsigned long addr);
 275
 276 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 277                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 278
 279 #define HAVE_ARCH_UNMAPPED_AREA
 280 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 281
 282 #define pgtable_cache_init()   do { } while (0)
 283 #define check_pgt_cache()      do { } while (0)
 284
 285 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 286 #define HAVE_PAGE_AGP 1
 287
 288 /* fs/proc/kcore.c */
 289 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 290 #define kc_offset_to_vaddr(o) \
 291    (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
 292
 293 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 294 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 295 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 296 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 297 #define __HAVE_ARCH_PTE_SAME
 298 #include <asm-generic/pgtable.h>
 299 #endif /* !__ASSEMBLY__ */
 300
 301 #endif /* _X86_64_PGTABLE_H */