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 #include <asm/pgtable_64_types.h>
   6
   7 #ifndef __ASSEMBLY__
   8
   9 /*
  10  * This file contains the functions and defines necessary to modify and use
  11  * the x86-64 page table tree.
  12  */
  13 #include <asm/processor.h>
  14 #include <linux/bitops.h>
  15 #include <linux/threads.h>
  16
  17 extern pud_t level3_kernel_pgt[512];
  18 extern pud_t level3_ident_pgt[512];
  19 extern pmd_t level2_kernel_pgt[512];
  20 extern pmd_t level2_fixmap_pgt[512];
  21 extern pmd_t level2_ident_pgt[512];
  22 extern pte_t level1_fixmap_pgt[512];
  23 extern pgd_t init_level4_pgt[];
  24
  25 #define swapper_pg_dir init_level4_pgt
  26
  27 extern void paging_init(void);
  28
  29 #define pte_ERROR(e)                                    \
  30         pr_err("%s:%d: bad pte %p(%016lx)\n",           \
  31                __FILE__, __LINE__, &(e), pte_val(e))
  32 #define pmd_ERROR(e)                                    \
  33         pr_err("%s:%d: bad pmd %p(%016lx)\n",           \
  34                __FILE__, __LINE__, &(e), pmd_val(e))
  35 #define pud_ERROR(e)                                    \
  36         pr_err("%s:%d: bad pud %p(%016lx)\n",           \
  37                __FILE__, __LINE__, &(e), pud_val(e))
  38 #define pgd_ERROR(e)                                    \
  39         pr_err("%s:%d: bad pgd %p(%016lx)\n",           \
  40                __FILE__, __LINE__, &(e), pgd_val(e))
  41
  42 struct mm_struct;
  43
  44 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  45
  46
  47 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  48                                     pte_t *ptep)
  49 {
  50         *ptep = native_make_pte(0);
  51 }
  52
  53 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  54 {
  55         *ptep = pte;
  56 }
  57
  58 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  59 {
  60         native_set_pte(ptep, pte);
  61 }
  62
  63 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  64 {
  65         *pmdp = pmd;
  66 }
  67
  68 static inline void native_pmd_clear(pmd_t *pmd)
  69 {
  70         native_set_pmd(pmd, native_make_pmd(0));
  71 }
  72
  73 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  74 {
  75 #ifdef CONFIG_SMP
  76         return native_make_pte(xchg(&xp->pte, 0));
  77 #else
  78         /* native_local_ptep_get_and_clear,
  79            but duplicated because of cyclic dependency */
  80         pte_t ret = *xp;
  81         native_pte_clear(NULL, 0, xp);
  82         return ret;
  83 #endif
  84 }
  85
  86 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  87 {
  88 #ifdef CONFIG_SMP
  89         return native_make_pmd(xchg(&xp->pmd, 0));
  90 #else
  91         /* native_local_pmdp_get_and_clear,
  92            but duplicated because of cyclic dependency */
  93         pmd_t ret = *xp;
  94         native_pmd_clear(xp);
  95         return ret;
  96 #endif
  97 }
  98
  99 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 100 {
 101         *pudp = pud;
 102 }
 103
 104 static inline void native_pud_clear(pud_t *pud)
 105 {
 106         native_set_pud(pud, native_make_pud(0));
 107 }
 108
 109 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 110 {
 111         *pgdp = pgd;
 112 }
 113
 114 static inline void native_pgd_clear(pgd_t *pgd)
 115 {
 116         native_set_pgd(pgd, native_make_pgd(0));
 117 }
 118
 119 extern void sync_global_pgds(unsigned long start, unsigned long end);
 120
 121 /*
 122  * Conversion functions: convert a page and protection to a page entry,
 123  * and a page entry and page directory to the page they refer to.
 124  */
 125
 126 /*
 127  * Level 4 access.
 128  */
 129 static inline int pgd_large(pgd_t pgd) { return 0; }
 130 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 131
 132 /* PUD - Level3 access */
 133
 134 /* PMD  - Level 2 access */
 135
 136 /* PTE - Level 1 access. */
 137
 138 /* x86-64 always has all page tables mapped. */
 139 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 140 #define pte_unmap(pte) ((void)(pte))/* NOP */
 141
 142 /*
 143  * Encode and de-code a swap entry
 144  *
 145  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2|1|0| <- bit number
 146  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U|W|P| <- bit names
 147  * | OFFSET (14->63) | TYPE (9-13)  |0|X|X|X| X| X|X|X|0| <- swp entry
 148  *
 149  * G (8) is aliased and used as a PROT_NONE indicator for
 150  * !present ptes.  We need to start storing swap entries above
 151  * there.  We also need to avoid using A and D because of an
 152  * erratum where they can be incorrectly set by hardware on
 153  * non-present PTEs.
 154  */
 155 #define SWP_TYPE_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
 156 #define SWP_TYPE_BITS 5
 157 /* Place the offset above the type: */
 158 #define SWP_OFFSET_FIRST_BIT (SWP_TYPE_FIRST_BIT + SWP_TYPE_BITS)
 159
 160 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 161
 162 #define __swp_type(x)                   (((x).val >> (SWP_TYPE_FIRST_BIT)) \
 163                                          & ((1U << SWP_TYPE_BITS) - 1))
 164 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_FIRST_BIT)
 165 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 166                                          ((type) << (SWP_TYPE_FIRST_BIT)) \
 167                                          | ((offset) << SWP_OFFSET_FIRST_BIT) })
 168 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 169 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 170
 171 extern int kern_addr_valid(unsigned long addr);
 172 extern void cleanup_highmap(void);
 173
 174 #define HAVE_ARCH_UNMAPPED_AREA
 175 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 176
 177 #define pgtable_cache_init()   do { } while (0)
 178 #define check_pgt_cache()      do { } while (0)
 179
 180 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 181 #define HAVE_PAGE_AGP 1
 182
 183 /* fs/proc/kcore.c */
 184 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 185 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
 186
 187 #define __HAVE_ARCH_PTE_SAME
 188
 189 #define vmemmap ((struct page *)VMEMMAP_START)
 190
 191 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
 192 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
 193
 194 #endif /* !__ASSEMBLY__ */
 195
 196 #endif /* _ASM_X86_PGTABLE_64_H */