arch/x86/include/asm/pgtable_64.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PGTABLE_64_H
   3 #define _ASM_X86_PGTABLE_64_H
   4
   5 #include <linux/const.h>
   6 #include <asm/pgtable_64_types.h>
   7
   8 #ifndef __ASSEMBLY__
   9
  10 /*
  11  * This file contains the functions and defines necessary to modify and use
  12  * the x86-64 page table tree.
  13  */
  14 #include <asm/processor.h>
  15 #include <linux/bitops.h>
  16 #include <linux/threads.h>
  17
  18 extern p4d_t level4_kernel_pgt[512];
  19 extern p4d_t level4_ident_pgt[512];
  20 extern pud_t level3_kernel_pgt[512];
  21 extern pud_t level3_ident_pgt[512];
  22 extern pmd_t level2_kernel_pgt[512];
  23 extern pmd_t level2_fixmap_pgt[512];
  24 extern pmd_t level2_ident_pgt[512];
  25 extern pte_t level1_fixmap_pgt[512];
  26 extern pgd_t init_top_pgt[];
  27
  28 #define swapper_pg_dir init_top_pgt
  29
  30 extern void paging_init(void);
  31
  32 #define pte_ERROR(e)                                    \
  33         pr_err("%s:%d: bad pte %p(%016lx)\n",           \
  34                __FILE__, __LINE__, &(e), pte_val(e))
  35 #define pmd_ERROR(e)                                    \
  36         pr_err("%s:%d: bad pmd %p(%016lx)\n",           \
  37                __FILE__, __LINE__, &(e), pmd_val(e))
  38 #define pud_ERROR(e)                                    \
  39         pr_err("%s:%d: bad pud %p(%016lx)\n",           \
  40                __FILE__, __LINE__, &(e), pud_val(e))
  41
  42 #if CONFIG_PGTABLE_LEVELS >= 5
  43 #define p4d_ERROR(e)                                    \
  44         pr_err("%s:%d: bad p4d %p(%016lx)\n",           \
  45                __FILE__, __LINE__, &(e), p4d_val(e))
  46 #endif
  47
  48 #define pgd_ERROR(e)                                    \
  49         pr_err("%s:%d: bad pgd %p(%016lx)\n",           \
  50                __FILE__, __LINE__, &(e), pgd_val(e))
  51
  52 struct mm_struct;
  53
  54 void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte);
  55 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  56
  57 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  58                                     pte_t *ptep)
  59 {
  60         *ptep = native_make_pte(0);
  61 }
  62
  63 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  64 {
  65         *ptep = pte;
  66 }
  67
  68 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  69 {
  70         native_set_pte(ptep, pte);
  71 }
  72
  73 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  74 {
  75         *pmdp = pmd;
  76 }
  77
  78 static inline void native_pmd_clear(pmd_t *pmd)
  79 {
  80         native_set_pmd(pmd, native_make_pmd(0));
  81 }
  82
  83 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  84 {
  85 #ifdef CONFIG_SMP
  86         return native_make_pte(xchg(&xp->pte, 0));
  87 #else
  88         /* native_local_ptep_get_and_clear,
  89            but duplicated because of cyclic dependency */
  90         pte_t ret = *xp;
  91         native_pte_clear(NULL, 0, xp);
  92         return ret;
  93 #endif
  94 }
  95
  96 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  97 {
  98 #ifdef CONFIG_SMP
  99         return native_make_pmd(xchg(&xp->pmd, 0));
 100 #else
 101         /* native_local_pmdp_get_and_clear,
 102            but duplicated because of cyclic dependency */
 103         pmd_t ret = *xp;
 104         native_pmd_clear(xp);
 105         return ret;
 106 #endif
 107 }
 108
 109 static inline void native_set_pud(pud_t *pudp, pud_t pud)
 110 {
 111         *pudp = pud;
 112 }
 113
 114 static inline void native_pud_clear(pud_t *pud)
 115 {
 116         native_set_pud(pud, native_make_pud(0));
 117 }
 118
 119 static inline pud_t native_pudp_get_and_clear(pud_t *xp)
 120 {
 121 #ifdef CONFIG_SMP
 122         return native_make_pud(xchg(&xp->pud, 0));
 123 #else
 124         /* native_local_pudp_get_and_clear,
 125          * but duplicated because of cyclic dependency
 126          */
 127         pud_t ret = *xp;
 128
 129         native_pud_clear(xp);
 130         return ret;
 131 #endif
 132 }
 133
 134 static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
 135 {
 136         *p4dp = p4d;
 137 }
 138
 139 static inline void native_p4d_clear(p4d_t *p4d)
 140 {
 141 #ifdef CONFIG_X86_5LEVEL
 142         native_set_p4d(p4d, native_make_p4d(0));
 143 #else
 144         native_set_p4d(p4d, (p4d_t) { .pgd = native_make_pgd(0)});
 145 #endif
 146 }
 147
 148 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 149 {
 150         *pgdp = pgd;
 151 }
 152
 153 static inline void native_pgd_clear(pgd_t *pgd)
 154 {
 155         native_set_pgd(pgd, native_make_pgd(0));
 156 }
 157
 158 extern void sync_global_pgds(unsigned long start, unsigned long end);
 159
 160 /*
 161  * Conversion functions: convert a page and protection to a page entry,
 162  * and a page entry and page directory to the page they refer to.
 163  */
 164
 165 /*
 166  * Level 4 access.
 167  */
 168 static inline int pgd_large(pgd_t pgd) { return 0; }
 169 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 170
 171 /* PUD - Level3 access */
 172
 173 /* PMD  - Level 2 access */
 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_unmap(pte) ((void)(pte))/* NOP */
 180
 181 /*
 182  * Encode and de-code a swap entry
 183  *
 184  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2| 1|0| <- bit number
 185  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
 186  * | OFFSET (14->63) | TYPE (9-13)  |0|0|X|X| X| X|X|SD|0| <- swp entry
 187  *
 188  * G (8) is aliased and used as a PROT_NONE indicator for
 189  * !present ptes.  We need to start storing swap entries above
 190  * there.  We also need to avoid using A and D because of an
 191  * erratum where they can be incorrectly set by hardware on
 192  * non-present PTEs.
 193  *
 194  * SD (1) in swp entry is used to store soft dirty bit, which helps us
 195  * remember soft dirty over page migration
 196  *
 197  * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
 198  * but also L and G.
 199  */
 200 #define SWP_TYPE_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
 201 #define SWP_TYPE_BITS 5
 202 /* Place the offset above the type: */
 203 #define SWP_OFFSET_FIRST_BIT (SWP_TYPE_FIRST_BIT + SWP_TYPE_BITS)
 204
 205 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 206
 207 #define __swp_type(x)                   (((x).val >> (SWP_TYPE_FIRST_BIT)) \
 208                                          & ((1U << SWP_TYPE_BITS) - 1))
 209 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_FIRST_BIT)
 210 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 211                                          ((type) << (SWP_TYPE_FIRST_BIT)) \
 212                                          | ((offset) << SWP_OFFSET_FIRST_BIT) })
 213 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 214 #define __pmd_to_swp_entry(pmd)         ((swp_entry_t) { pmd_val((pmd)) })
 215 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 216 #define __swp_entry_to_pmd(x)           ((pmd_t) { .pmd = (x).val })
 217
 218 extern int kern_addr_valid(unsigned long addr);
 219 extern void cleanup_highmap(void);
 220
 221 #define HAVE_ARCH_UNMAPPED_AREA
 222 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 223
 224 #define pgtable_cache_init()   do { } while (0)
 225 #define check_pgt_cache()      do { } while (0)
 226
 227 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 228 #define HAVE_PAGE_AGP 1
 229
 230 /* fs/proc/kcore.c */
 231 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 232 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
 233
 234 #define __HAVE_ARCH_PTE_SAME
 235
 236 #define vmemmap ((struct page *)VMEMMAP_START)
 237
 238 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
 239 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
 240
 241 #define gup_fast_permitted gup_fast_permitted
 242 static inline bool gup_fast_permitted(unsigned long start, int nr_pages,
 243                 int write)
 244 {
 245         unsigned long len, end;
 246
 247         len = (unsigned long)nr_pages << PAGE_SHIFT;
 248         end = start + len;
 249         if (end < start)
 250                 return false;
 251         if (end >> __VIRTUAL_MASK_SHIFT)
 252                 return false;
 253         return true;
 254 }
 255
 256 #endif /* !__ASSEMBLY__ */
 257 #endif /* _ASM_X86_PGTABLE_64_H */