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 pgd_t init_level4_pgt[];
  23
  24 #define swapper_pg_dir init_level4_pgt
  25
  26 extern void paging_init(void);
  27
  28 #define pte_ERROR(e)                                    \
  29         printk("%s:%d: bad pte %p(%016lx).\n",          \
  30                __FILE__, __LINE__, &(e), pte_val(e))
  31 #define pmd_ERROR(e)                                    \
  32         printk("%s:%d: bad pmd %p(%016lx).\n",          \
  33                __FILE__, __LINE__, &(e), pmd_val(e))
  34 #define pud_ERROR(e)                                    \
  35         printk("%s:%d: bad pud %p(%016lx).\n",          \
  36                __FILE__, __LINE__, &(e), pud_val(e))
  37 #define pgd_ERROR(e)                                    \
  38         printk("%s:%d: bad pgd %p(%016lx).\n",          \
  39                __FILE__, __LINE__, &(e), pgd_val(e))
  40
  41 struct mm_struct;
  42
  43 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  44
  45
  46 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  47                                     pte_t *ptep)
  48 {
  49         *ptep = native_make_pte(0);
  50 }
  51
  52 static inline void native_set_pte(pte_t *ptep, pte_t pte)
  53 {
  54         *ptep = pte;
  55 }
  56
  57 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  58 {
  59         native_set_pte(ptep, pte);
  60 }
  61
  62 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
  63 {
  64         *pmdp = pmd;
  65 }
  66
  67 static inline void native_pmd_clear(pmd_t *pmd)
  68 {
  69         native_set_pmd(pmd, native_make_pmd(0));
  70 }
  71
  72 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  73 {
  74 #ifdef CONFIG_SMP
  75         return native_make_pte(xchg(&xp->pte, 0));
  76 #else
  77         /* native_local_ptep_get_and_clear,
  78            but duplicated because of cyclic dependency */
  79         pte_t ret = *xp;
  80         native_pte_clear(NULL, 0, xp);
  81         return ret;
  82 #endif
  83 }
  84
  85 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
  86 {
  87 #ifdef CONFIG_SMP
  88         return native_make_pmd(xchg(&xp->pmd, 0));
  89 #else
  90         /* native_local_pmdp_get_and_clear,
  91            but duplicated because of cyclic dependency */
  92         pmd_t ret = *xp;
  93         native_pmd_clear(xp);
  94         return ret;
  95 #endif
  96 }
  97
  98 static inline void native_set_pud(pud_t *pudp, pud_t pud)
  99 {
 100         *pudp = pud;
 101 }
 102
 103 static inline void native_pud_clear(pud_t *pud)
 104 {
 105         native_set_pud(pud, native_make_pud(0));
 106 }
 107
 108 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 109 {
 110         *pgdp = pgd;
 111 }
 112
 113 static inline void native_pgd_clear(pgd_t *pgd)
 114 {
 115         native_set_pgd(pgd, native_make_pgd(0));
 116 }
 117
 118 extern void sync_global_pgds(unsigned long start, unsigned long end);
 119
 120 /*
 121  * Conversion functions: convert a page and protection to a page entry,
 122  * and a page entry and page directory to the page they refer to.
 123  */
 124
 125 /*
 126  * Level 4 access.
 127  */
 128 static inline int pgd_large(pgd_t pgd) { return 0; }
 129 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 130
 131 /* PUD - Level3 access */
 132
 133 /* PMD  - Level 2 access */
 134 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 135 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |     \
 136                                             _PAGE_FILE })
 137 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 138
 139 /* PTE - Level 1 access. */
 140
 141 /* x86-64 always has all page tables mapped. */
 142 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 143 #define pte_unmap(pte) ((void)(pte))/* NOP */
 144
 145 #define update_mmu_cache(vma, address, ptep) do { } while (0)
 146
 147 /* Encode and de-code a swap entry */
 148 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
 149 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
 150 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
 151 #else
 152 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
 153 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
 154 #endif
 155
 156 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
 157
 158 #define __swp_type(x)                   (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
 159                                          & ((1U << SWP_TYPE_BITS) - 1))
 160 #define __swp_offset(x)                 ((x).val >> SWP_OFFSET_SHIFT)
 161 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 162                                          ((type) << (_PAGE_BIT_PRESENT + 1)) \
 163                                          | ((offset) << SWP_OFFSET_SHIFT) })
 164 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 165 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 166
 167 extern int kern_addr_valid(unsigned long addr);
 168 extern void cleanup_highmap(void);
 169
 170 #define HAVE_ARCH_UNMAPPED_AREA
 171 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 172
 173 #define pgtable_cache_init()   do { } while (0)
 174 #define check_pgt_cache()      do { } while (0)
 175
 176 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 177 #define HAVE_PAGE_AGP 1
 178
 179 /* fs/proc/kcore.c */
 180 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 181 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
 182
 183 #define __HAVE_ARCH_PTE_SAME
 184
 185 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 186 static inline int pmd_trans_splitting(pmd_t pmd)
 187 {
 188         return pmd_val(pmd) & _PAGE_SPLITTING;
 189 }
 190
 191 static inline int pmd_trans_huge(pmd_t pmd)
 192 {
 193         return pmd_val(pmd) & _PAGE_PSE;
 194 }
 195 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 196
 197 #define mk_pmd(page, pgprot)   pfn_pmd(page_to_pfn(page), (pgprot))
 198
 199 #define  __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
 200 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
 201                                  unsigned long address, pmd_t *pmdp,
 202                                  pmd_t entry, int dirty);
 203
 204 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 205 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 206                                      unsigned long addr, pmd_t *pmdp);
 207
 208 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
 209 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
 210                                   unsigned long address, pmd_t *pmdp);
 211
 212
 213 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 214 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 215                                  unsigned long addr, pmd_t *pmdp);
 216
 217 #define __HAVE_ARCH_PMD_WRITE
 218 static inline int pmd_write(pmd_t pmd)
 219 {
 220         return pmd_flags(pmd) & _PAGE_RW;
 221 }
 222
 223 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 224 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
 225                                        pmd_t *pmdp)
 226 {
 227         pmd_t pmd = native_pmdp_get_and_clear(pmdp);
 228         pmd_update(mm, addr, pmdp);
 229         return pmd;
 230 }
 231
 232 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
 233 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 234                                       unsigned long addr, pmd_t *pmdp)
 235 {
 236         clear_bit(_PAGE_BIT_RW, (unsigned long *)&pmdp->pmd);
 237         pmd_update(mm, addr, pmdp);
 238 }
 239
 240 static inline int pmd_young(pmd_t pmd)
 241 {
 242         return pmd_flags(pmd) & _PAGE_ACCESSED;
 243 }
 244
 245 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
 246 {
 247         pmdval_t v = native_pmd_val(pmd);
 248
 249         return native_make_pmd(v | set);
 250 }
 251
 252 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
 253 {
 254         pmdval_t v = native_pmd_val(pmd);
 255
 256         return native_make_pmd(v & ~clear);
 257 }
 258
 259 static inline pmd_t pmd_mkold(pmd_t pmd)
 260 {
 261         return pmd_clear_flags(pmd, _PAGE_ACCESSED);
 262 }
 263
 264 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 265 {
 266         return pmd_clear_flags(pmd, _PAGE_RW);
 267 }
 268
 269 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 270 {
 271         return pmd_set_flags(pmd, _PAGE_DIRTY);
 272 }
 273
 274 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 275 {
 276         return pmd_set_flags(pmd, _PAGE_PSE);
 277 }
 278
 279 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 280 {
 281         return pmd_set_flags(pmd, _PAGE_ACCESSED);
 282 }
 283
 284 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 285 {
 286         return pmd_set_flags(pmd, _PAGE_RW);
 287 }
 288
 289 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 290 {
 291         return pmd_clear_flags(pmd, _PAGE_PRESENT);
 292 }
 293
 294 #endif /* !__ASSEMBLY__ */
 295
 296 #endif /* _ASM_X86_PGTABLE_64_H */