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 p4d_t level4_kernel_pgt[512];
  18 extern p4d_t level4_ident_pgt[512];
  19 extern pud_t level3_kernel_pgt[512];
  20 extern pud_t level3_ident_pgt[512];
  21 extern pmd_t level2_kernel_pgt[512];
  22 extern pmd_t level2_fixmap_pgt[512];
  23 extern pmd_t level2_ident_pgt[512];
  24 extern pte_t level1_fixmap_pgt[512];
  25 extern pgd_t init_top_pgt[];
  26
  27 #define swapper_pg_dir init_top_pgt
  28
  29 extern void paging_init(void);
  30
  31 #define pte_ERROR(e)                                    \
  32         pr_err("%s:%d: bad pte %p(%016lx)\n",           \
  33                __FILE__, __LINE__, &(e), pte_val(e))
  34 #define pmd_ERROR(e)                                    \
  35         pr_err("%s:%d: bad pmd %p(%016lx)\n",           \
  36                __FILE__, __LINE__, &(e), pmd_val(e))
  37 #define pud_ERROR(e)                                    \
  38         pr_err("%s:%d: bad pud %p(%016lx)\n",           \
  39                __FILE__, __LINE__, &(e), pud_val(e))
  40
  41 #if CONFIG_PGTABLE_LEVELS >= 5
  42 #define p4d_ERROR(e)                                    \
  43         pr_err("%s:%d: bad p4d %p(%016lx)\n",           \
  44                __FILE__, __LINE__, &(e), p4d_val(e))
  45 #endif
  46
  47 #define pgd_ERROR(e)                                    \
  48         pr_err("%s:%d: bad pgd %p(%016lx)\n",           \
  49                __FILE__, __LINE__, &(e), pgd_val(e))
  50
  51 struct mm_struct;
  52
  53 void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte);
  54 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  55
  56 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  57                                     pte_t *ptep)
  58 {
  59         *ptep = native_make_pte(0);
  60 }
  61
  62 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  63 {
  64         *ptep = pte;
  65 }
  66
  67 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  68 {
  69         native_set_pte(ptep, pte);
  70 }
  71
  72 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  73 {
  74         *pmdp = pmd;
  75 }
  76
  77 static inline void native_pmd_clear(pmd_t *pmd)
  78 {
  79         native_set_pmd(pmd, native_make_pmd(0));
  80 }
  81
  82 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  83 {
  84 #ifdef CONFIG_SMP
  85         return native_make_pte(xchg(&xp->pte, 0));
  86 #else
  87         /* native_local_ptep_get_and_clear,
  88            but duplicated because of cyclic dependency */
  89         pte_t ret = *xp;
  90         native_pte_clear(NULL, 0, xp);
  91         return ret;
  92 #endif
  93 }
  94
  95 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  96 {
  97 #ifdef CONFIG_SMP
  98         return native_make_pmd(xchg(&xp->pmd, 0));
  99 #else
 100         /* native_local_pmdp_get_and_clear,
 101            but duplicated because of cyclic dependency */
 102         pmd_t ret = *xp;
 103         native_pmd_clear(xp);
 104         return ret;
 105 #endif
 106 }
 107
 108 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 109 {
 110         *pudp = pud;
 111 }
 112
 113 static inline void native_pud_clear(pud_t *pud)
 114 {
 115         native_set_pud(pud, native_make_pud(0));
 116 }
 117
 118 static inline pud_t native_pudp_get_and_clear(pud_t *xp)
 119 {
 120 #ifdef CONFIG_SMP
 121         return native_make_pud(xchg(&xp->pud, 0));
 122 #else
 123         /* native_local_pudp_get_and_clear,
 124          * but duplicated because of cyclic dependency
 125          */
 126         pud_t ret = *xp;
 127
 128         native_pud_clear(xp);
 129         return ret;
 130 #endif
 131 }
 132
 133 static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
 134 {
 135         *p4dp = p4d;
 136 }
 137
 138 static inline void native_p4d_clear(p4d_t *p4d)
 139 {
 140 #ifdef CONFIG_X86_5LEVEL
 141         native_set_p4d(p4d, native_make_p4d(0));
 142 #else
 143         native_set_p4d(p4d, (p4d_t) { .pgd = native_make_pgd(0)});
 144 #endif
 145 }
 146
 147 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 148 {
 149         *pgdp = pgd;
 150 }
 151
 152 static inline void native_pgd_clear(pgd_t *pgd)
 153 {
 154         native_set_pgd(pgd, native_make_pgd(0));
 155 }
 156
 157 extern void sync_global_pgds(unsigned long start, unsigned long end);
 158
 159 /*
 160  * Conversion functions: convert a page and protection to a page entry,
 161  * and a page entry and page directory to the page they refer to.
 162  */
 163
 164 /*
 165  * Level 4 access.
 166  */
 167 static inline int pgd_large(pgd_t pgd) { return 0; }
 168 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 169
 170 /* PUD - Level3 access */
 171
 172 /* PMD  - Level 2 access */
 173
 174 /* PTE - Level 1 access. */
 175
 176 /* x86-64 always has all page tables mapped. */
 177 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 178 #define pte_unmap(pte) ((void)(pte))/* NOP */
 179
 180 /*
 181  * Encode and de-code a swap entry
 182  *
 183  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2| 1|0| <- bit number
 184  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
 185  * | OFFSET (14->63) | TYPE (9-13)  |0|0|X|X| X| X|X|SD|0| <- swp entry
 186  *
 187  * G (8) is aliased and used as a PROT_NONE indicator for
 188  * !present ptes.  We need to start storing swap entries above
 189  * there.  We also need to avoid using A and D because of an
 190  * erratum where they can be incorrectly set by hardware on
 191  * non-present PTEs.
 192  *
 193  * SD (1) in swp entry is used to store soft dirty bit, which helps us
 194  * remember soft dirty over page migration
 195  *
 196  * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
 197  * but also L and G.
 198  */
 199 #define SWP_TYPE_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
 200 #define SWP_TYPE_BITS 5
 201 /* Place the offset above the type: */
 202 #define SWP_OFFSET_FIRST_BIT (SWP_TYPE_FIRST_BIT + SWP_TYPE_BITS)
 203
 204 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 205
 206 #define __swp_type(x)                   (((x).val >> (SWP_TYPE_FIRST_BIT)) \
 207                                          & ((1U << SWP_TYPE_BITS) - 1))
 208 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_FIRST_BIT)
 209 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 210                                          ((type) << (SWP_TYPE_FIRST_BIT)) \
 211                                          | ((offset) << SWP_OFFSET_FIRST_BIT) })
 212 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 213 #define __pmd_to_swp_entry(pmd)         ((swp_entry_t) { pmd_val((pmd)) })
 214 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 215 #define __swp_entry_to_pmd(x)           ((pmd_t) { .pmd = (x).val })
 216
 217 extern int kern_addr_valid(unsigned long addr);
 218 extern void cleanup_highmap(void);
 219
 220 #define HAVE_ARCH_UNMAPPED_AREA
 221 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 222
 223 #define pgtable_cache_init()   do { } while (0)
 224 #define check_pgt_cache()      do { } while (0)
 225
 226 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 227 #define HAVE_PAGE_AGP 1
 228
 229 /* fs/proc/kcore.c */
 230 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 231 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
 232
 233 #define __HAVE_ARCH_PTE_SAME
 234
 235 #define vmemmap ((struct page *)VMEMMAP_START)
 236
 237 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
 238 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
 239
 240 #define gup_fast_permitted gup_fast_permitted
 241 static inline bool gup_fast_permitted(unsigned long start, int nr_pages,
 242                 int write)
 243 {
 244         unsigned long len, end;
 245
 246         len = (unsigned long)nr_pages << PAGE_SHIFT;
 247         end = start + len;
 248         if (end < start)
 249                 return false;
 250         if (end >> __VIRTUAL_MASK_SHIFT)
 251                 return false;
 252         return true;
 253 }
 254
 255 #endif /* !__ASSEMBLY__ */
 256 #endif /* _ASM_X86_PGTABLE_64_H */