arch/x86/include/asm/pgtable_64.h

   1 #ifndef _ASM_X86_PGTABLE_64_H
   2 #define _ASM_X86_PGTABLE_64_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 pmd_t level2_fixmap_pgt[512];
  20 extern pmd_t level2_ident_pgt[512];
  21 extern pgd_t init_level4_pgt[];
  22
  23 #define swapper_pg_dir init_level4_pgt
  24
  25 extern void paging_init(void);
  26
  27 #endif /* !__ASSEMBLY__ */
  28
  29 #define SHARED_KERNEL_PMD       0
  30
  31 /*
  32  * PGDIR_SHIFT determines what a top-level page table entry can map
  33  */
  34 #define PGDIR_SHIFT     39
  35 #define PTRS_PER_PGD    512
  36
  37 /*
  38  * 3rd level page
  39  */
  40 #define PUD_SHIFT       30
  41 #define PTRS_PER_PUD    512
  42
  43 /*
  44  * PMD_SHIFT determines the size of the area a middle-level
  45  * page table can map
  46  */
  47 #define PMD_SHIFT       21
  48 #define PTRS_PER_PMD    512
  49
  50 /*
  51  * entries per page directory level
  52  */
  53 #define PTRS_PER_PTE    512
  54
  55 #ifndef __ASSEMBLY__
  56
  57 #define pte_ERROR(e)                                    \
  58         printk("%s:%d: bad pte %p(%016lx).\n",          \
  59                __FILE__, __LINE__, &(e), pte_val(e))
  60 #define pmd_ERROR(e)                                    \
  61         printk("%s:%d: bad pmd %p(%016lx).\n",          \
  62                __FILE__, __LINE__, &(e), pmd_val(e))
  63 #define pud_ERROR(e)                                    \
  64         printk("%s:%d: bad pud %p(%016lx).\n",          \
  65                __FILE__, __LINE__, &(e), pud_val(e))
  66 #define pgd_ERROR(e)                                    \
  67         printk("%s:%d: bad pgd %p(%016lx).\n",          \
  68                __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 struct mm_struct;
  74
  75 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  76
  77
  78 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  79                                     pte_t *ptep)
  80 {
  81         *ptep = native_make_pte(0);
  82 }
  83
  84 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  85 {
  86         *ptep = pte;
  87 }
  88
  89 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  90 {
  91         native_set_pte(ptep, pte);
  92 }
  93
  94 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  95 {
  96 #ifdef CONFIG_SMP
  97         return native_make_pte(xchg(&xp->pte, 0));
  98 #else
  99         /* native_local_ptep_get_and_clear,
 100            but duplicated because of cyclic dependency */
 101         pte_t ret = *xp;
 102         native_pte_clear(NULL, 0, xp);
 103         return ret;
 104 #endif
 105 }
 106
 107 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 108 {
 109         *pmdp = pmd;
 110 }
 111
 112 static inline void native_pmd_clear(pmd_t *pmd)
 113 {
 114         native_set_pmd(pmd, native_make_pmd(0));
 115 }
 116
 117 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 118 {
 119         *pudp = pud;
 120 }
 121
 122 static inline void native_pud_clear(pud_t *pud)
 123 {
 124         native_set_pud(pud, native_make_pud(0));
 125 }
 126
 127 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 128 {
 129         *pgdp = pgd;
 130 }
 131
 132 static inline void native_pgd_clear(pgd_t *pgd)
 133 {
 134         native_set_pgd(pgd, native_make_pgd(0));
 135 }
 136
 137 #endif /* !__ASSEMBLY__ */
 138
 139 #define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
 140 #define PMD_MASK        (~(PMD_SIZE - 1))
 141 #define PUD_SIZE        (_AC(1, UL) << PUD_SHIFT)
 142 #define PUD_MASK        (~(PUD_SIZE - 1))
 143 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
 144 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
 145
 146
 147 #define MAXMEM           _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
 148 #define VMALLOC_START    _AC(0xffffc20000000000, UL)
 149 #define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
 150 #define VMEMMAP_START    _AC(0xffffe20000000000, UL)
 151 #define MODULES_VADDR    _AC(0xffffffffa0000000, UL)
 152 #define MODULES_END      _AC(0xffffffffff000000, UL)
 153 #define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 154
 155 #ifndef __ASSEMBLY__
 156
 157 static inline int pgd_bad(pgd_t pgd)
 158 {
 159         return (pgd_val(pgd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 160 }
 161
 162 static inline int pud_bad(pud_t pud)
 163 {
 164         return (pud_val(pud) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 165 }
 166
 167 static inline int pmd_bad(pmd_t pmd)
 168 {
 169         return (pmd_val(pmd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 170 }
 171
 172 #define pages_to_mb(x)  ((x) >> (20 - PAGE_SHIFT))   /* FIXME: is this right? */
 173
 174 /*
 175  * Conversion functions: convert a page and protection to a page entry,
 176  * and a page entry and page directory to the page they refer to.
 177  */
 178
 179 /*
 180  * Level 4 access.
 181  */
 182 static inline int pgd_large(pgd_t pgd) { return 0; }
 183 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 184
 185 /* PUD - Level3 access */
 186
 187 static inline int pud_large(pud_t pte)
 188 {
 189         return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 190                 (_PAGE_PSE | _PAGE_PRESENT);
 191 }
 192
 193 /* PMD  - Level 2 access */
 194 #define pmd_pfn(x)  ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 195
 196 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 197 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |     \
 198                                             _PAGE_FILE })
 199 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 200
 201 /* PTE - Level 1 access. */
 202
 203 /* page, protection -> pte */
 204 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn((page)), (pgprot))
 205
 206 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 207 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
 208                                          pte_index((address)))
 209
 210 /* x86-64 always has all page tables mapped. */
 211 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 212 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
 213 #define pte_unmap(pte) /* NOP */
 214 #define pte_unmap_nested(pte) /* NOP */
 215
 216 #define update_mmu_cache(vma, address, pte) do { } while (0)
 217
 218 extern int direct_gbpages;
 219
 220 /* Encode and de-code a swap entry */
 221 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
 222 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
 223 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
 224 #else
 225 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
 226 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
 227 #endif
 228
 229 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 230
 231 #define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
 232                                          & ((1U << SWP_TYPE_BITS) - 1))
 233 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
 234 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 235                                          ((type) << (_PAGE_BIT_PRESENT + 1)) \
 236                                          | ((offset) << SWP_OFFSET_SHIFT) })
 237 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 238 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 239
 240 extern int kern_addr_valid(unsigned long addr);
 241 extern void cleanup_highmap(void);
 242
 243 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 244         remap_pfn_range(vma, vaddr, pfn, size, prot)
 245
 246 #define HAVE_ARCH_UNMAPPED_AREA
 247 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 248
 249 #define pgtable_cache_init()   do { } while (0)
 250 #define check_pgt_cache()      do { } while (0)
 251
 252 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 253 #define HAVE_PAGE_AGP 1
 254
 255 /* fs/proc/kcore.c */
 256 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 257 #define kc_offset_to_vaddr(o)                           \
 258         (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1)))    \
 259          ? ((o) | ~__VIRTUAL_MASK)                      \
 260          : (o))
 261
 262 #define __HAVE_ARCH_PTE_SAME
 263 #endif /* !__ASSEMBLY__ */
 264
 265 #endif /* _ASM_X86_PGTABLE_64_H */