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
  39 #if CONFIG_PGTABLE_LEVELS >= 5
  40 #define p4d_ERROR(e)                                    \
  41         pr_err("%s:%d: bad p4d %p(%016lx)\n",           \
  42                __FILE__, __LINE__, &(e), p4d_val(e))
  43 #endif
  44
  45 #define pgd_ERROR(e)                                    \
  46         pr_err("%s:%d: bad pgd %p(%016lx)\n",           \
  47                __FILE__, __LINE__, &(e), pgd_val(e))
  48
  49 struct mm_struct;
  50
  51 void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte);
  52 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  53
  54 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  55                                     pte_t *ptep)
  56 {
  57         *ptep = native_make_pte(0);
  58 }
  59
  60 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  61 {
  62         *ptep = pte;
  63 }
  64
  65 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  66 {
  67         native_set_pte(ptep, pte);
  68 }
  69
  70 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  71 {
  72         *pmdp = pmd;
  73 }
  74
  75 static inline void native_pmd_clear(pmd_t *pmd)
  76 {
  77         native_set_pmd(pmd, native_make_pmd(0));
  78 }
  79
  80 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  81 {
  82 #ifdef CONFIG_SMP
  83         return native_make_pte(xchg(&xp->pte, 0));
  84 #else
  85         /* native_local_ptep_get_and_clear,
  86            but duplicated because of cyclic dependency */
  87         pte_t ret = *xp;
  88         native_pte_clear(NULL, 0, xp);
  89         return ret;
  90 #endif
  91 }
  92
  93 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  94 {
  95 #ifdef CONFIG_SMP
  96         return native_make_pmd(xchg(&xp->pmd, 0));
  97 #else
  98         /* native_local_pmdp_get_and_clear,
  99            but duplicated because of cyclic dependency */
 100         pmd_t ret = *xp;
 101         native_pmd_clear(xp);
 102         return ret;
 103 #endif
 104 }
 105
 106 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 107 {
 108         *pudp = pud;
 109 }
 110
 111 static inline void native_pud_clear(pud_t *pud)
 112 {
 113         native_set_pud(pud, native_make_pud(0));
 114 }
 115
 116 static inline pud_t native_pudp_get_and_clear(pud_t *xp)
 117 {
 118 #ifdef CONFIG_SMP
 119         return native_make_pud(xchg(&xp->pud, 0));
 120 #else
 121         /* native_local_pudp_get_and_clear,
 122          * but duplicated because of cyclic dependency
 123          */
 124         pud_t ret = *xp;
 125
 126         native_pud_clear(xp);
 127         return ret;
 128 #endif
 129 }
 130
 131 static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
 132 {
 133         *p4dp = p4d;
 134 }
 135
 136 static inline void native_p4d_clear(p4d_t *p4d)
 137 {
 138 #ifdef CONFIG_X86_5LEVEL
 139         native_set_p4d(p4d, native_make_p4d(0));
 140 #else
 141         native_set_p4d(p4d, (p4d_t) { .pgd = native_make_pgd(0)});
 142 #endif
 143 }
 144
 145 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 146 {
 147         *pgdp = pgd;
 148 }
 149
 150 static inline void native_pgd_clear(pgd_t *pgd)
 151 {
 152         native_set_pgd(pgd, native_make_pgd(0));
 153 }
 154
 155 extern void sync_global_pgds(unsigned long start, unsigned long end);
 156
 157 /*
 158  * Conversion functions: convert a page and protection to a page entry,
 159  * and a page entry and page directory to the page they refer to.
 160  */
 161
 162 /*
 163  * Level 4 access.
 164  */
 165 static inline int pgd_large(pgd_t pgd) { return 0; }
 166 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 167
 168 /* PUD - Level3 access */
 169
 170 /* PMD  - Level 2 access */
 171
 172 /* PTE - Level 1 access. */
 173
 174 /* x86-64 always has all page tables mapped. */
 175 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 176 #define pte_unmap(pte) ((void)(pte))/* NOP */
 177
 178 /*
 179  * Encode and de-code a swap entry
 180  *
 181  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2|1|0| <- bit number
 182  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U|W|P| <- bit names
 183  * | OFFSET (14->63) | TYPE (9-13)  |0|X|X|X| X| X|X|X|0| <- swp entry
 184  *
 185  * G (8) is aliased and used as a PROT_NONE indicator for
 186  * !present ptes.  We need to start storing swap entries above
 187  * there.  We also need to avoid using A and D because of an
 188  * erratum where they can be incorrectly set by hardware on
 189  * non-present PTEs.
 190  */
 191 #define SWP_TYPE_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
 192 #define SWP_TYPE_BITS 5
 193 /* Place the offset above the type: */
 194 #define SWP_OFFSET_FIRST_BIT (SWP_TYPE_FIRST_BIT + SWP_TYPE_BITS)
 195
 196 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 197
 198 #define __swp_type(x)                   (((x).val >> (SWP_TYPE_FIRST_BIT)) \
 199                                          & ((1U << SWP_TYPE_BITS) - 1))
 200 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_FIRST_BIT)
 201 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 202                                          ((type) << (SWP_TYPE_FIRST_BIT)) \
 203                                          | ((offset) << SWP_OFFSET_FIRST_BIT) })
 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 HAVE_ARCH_UNMAPPED_AREA
 211 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 212
 213 #define pgtable_cache_init()   do { } while (0)
 214 #define check_pgt_cache()      do { } while (0)
 215
 216 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 217 #define HAVE_PAGE_AGP 1
 218
 219 /* fs/proc/kcore.c */
 220 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 221 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
 222
 223 #define __HAVE_ARCH_PTE_SAME
 224
 225 #define vmemmap ((struct page *)VMEMMAP_START)
 226
 227 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
 228 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
 229
 230 #define gup_fast_permitted gup_fast_permitted
 231 static inline bool gup_fast_permitted(unsigned long start, int nr_pages,
 232                 int write)
 233 {
 234         unsigned long len, end;
 235
 236         len = (unsigned long)nr_pages << PAGE_SHIFT;
 237         end = start + len;
 238         if (end < start)
 239                 return false;
 240         if (end >> __VIRTUAL_MASK_SHIFT)
 241                 return false;
 242         return true;
 243 }
 244
 245 #endif /* !__ASSEMBLY__ */
 246 #endif /* _ASM_X86_PGTABLE_64_H */