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
  72 struct mm_struct;
  73
  74 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  75
  76
  77 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  78                                     pte_t *ptep)
  79 {
  80         *ptep = native_make_pte(0);
  81 }
  82
  83 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  84 {
  85         *ptep = pte;
  86 }
  87
  88 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  89 {
  90         native_set_pte(ptep, pte);
  91 }
  92
  93 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  94 {
  95 #ifdef CONFIG_SMP
  96         return native_make_pte(xchg(&xp->pte, 0));
  97 #else
  98         /* native_local_ptep_get_and_clear,
  99            but duplicated because of cyclic dependency */
 100         pte_t ret = *xp;
 101         native_pte_clear(NULL, 0, xp);
 102         return ret;
 103 #endif
 104 }
 105
 106 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 107 {
 108         *pmdp = pmd;
 109 }
 110
 111 static inline void native_pmd_clear(pmd_t *pmd)
 112 {
 113         native_set_pmd(pmd, native_make_pmd(0));
 114 }
 115
 116 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 117 {
 118         *pudp = pud;
 119 }
 120
 121 static inline void native_pud_clear(pud_t *pud)
 122 {
 123         native_set_pud(pud, native_make_pud(0));
 124 }
 125
 126 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 127 {
 128         *pgdp = pgd;
 129 }
 130
 131 static inline void native_pgd_clear(pgd_t *pgd)
 132 {
 133         native_set_pgd(pgd, native_make_pgd(0));
 134 }
 135
 136 #endif /* !__ASSEMBLY__ */
 137
 138 #define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
 139 #define PMD_MASK        (~(PMD_SIZE - 1))
 140 #define PUD_SIZE        (_AC(1, UL) << PUD_SHIFT)
 141 #define PUD_MASK        (~(PUD_SIZE - 1))
 142 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
 143 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
 144
 145
 146 #define MAXMEM           _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
 147 #define VMALLOC_START    _AC(0xffffc20000000000, UL)
 148 #define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
 149 #define VMEMMAP_START    _AC(0xffffe20000000000, UL)
 150 #define MODULES_VADDR    _AC(0xffffffffa0000000, UL)
 151 #define MODULES_END      _AC(0xffffffffff000000, UL)
 152 #define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 153
 154 #ifndef __ASSEMBLY__
 155
 156 /*
 157  * Conversion functions: convert a page and protection to a page entry,
 158  * and a page entry and page directory to the page they refer to.
 159  */
 160
 161 /*
 162  * Level 4 access.
 163  */
 164 static inline int pgd_large(pgd_t pgd) { return 0; }
 165 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 166
 167 /* PUD - Level3 access */
 168
 169 /* PMD  - Level 2 access */
 170 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 171 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |     \
 172                                             _PAGE_FILE })
 173 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 174
 175 /* PTE - Level 1 access. */
 176
 177 /* x86-64 always has all page tables mapped. */
 178 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 179 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
 180 #define pte_unmap(pte) /* NOP */
 181 #define pte_unmap_nested(pte) /* NOP */
 182
 183 #define update_mmu_cache(vma, address, pte) do { } while (0)
 184
 185 extern int direct_gbpages;
 186
 187 /* Encode and de-code a swap entry */
 188 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
 189 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
 190 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
 191 #else
 192 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
 193 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
 194 #endif
 195
 196 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 197
 198 #define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
 199                                          & ((1U << SWP_TYPE_BITS) - 1))
 200 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
 201 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 202                                          ((type) << (_PAGE_BIT_PRESENT + 1)) \
 203                                          | ((offset) << SWP_OFFSET_SHIFT) })
 204 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 205 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 206
 207 extern int kern_addr_valid(unsigned long addr);
 208 extern void cleanup_highmap(void);
 209
 210 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 211         remap_pfn_range(vma, vaddr, pfn, size, prot)
 212
 213 #define HAVE_ARCH_UNMAPPED_AREA
 214 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 215
 216 #define pgtable_cache_init()   do { } while (0)
 217 #define check_pgt_cache()      do { } while (0)
 218
 219 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 220 #define HAVE_PAGE_AGP 1
 221
 222 /* fs/proc/kcore.c */
 223 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 224 #define kc_offset_to_vaddr(o)                           \
 225         (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1)))    \
 226          ? ((o) | ~__VIRTUAL_MASK)                      \
 227          : (o))
 228
 229 #define __HAVE_ARCH_PTE_SAME
 230 #endif /* !__ASSEMBLY__ */
 231
 232 #endif /* _ASM_X86_PGTABLE_64_H */