linux/arch/x86/include/asm/pgtable_64.h
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   1#ifndef _ASM_X86_PGTABLE_64_H
   2#define _ASM_X86_PGTABLE_64_H
   3
   4#include <linux/const.h>
   5#ifndef __ASSEMBLY__
   6
   7/*
   8 * This file contains the functions and defines necessary to modify and use
   9 * the x86-64 page table tree.
  10 */
  11#include <asm/processor.h>
  12#include <linux/bitops.h>
  13#include <linux/threads.h>
  14#include <asm/pda.h>
  15
  16extern pud_t level3_kernel_pgt[512];
  17extern pud_t level3_ident_pgt[512];
  18extern pmd_t level2_kernel_pgt[512];
  19extern pmd_t level2_fixmap_pgt[512];
  20extern pmd_t level2_ident_pgt[512];
  21extern pgd_t init_level4_pgt[];
  22
  23#define swapper_pg_dir init_level4_pgt
  24
  25extern void paging_init(void);
  26
  27#endif /* !__ASSEMBLY__ */
  28
  29#define SHARED_KERNEL_PMD       0
  30
  31/*
  32 * PGDIR_SHIFT determines what a top-level page table entry can map
  33 */
  34#define PGDIR_SHIFT     39
  35#define PTRS_PER_PGD    512
  36
  37/*
  38 * 3rd level page
  39 */
  40#define PUD_SHIFT       30
  41#define PTRS_PER_PUD    512
  42
  43/*
  44 * PMD_SHIFT determines the size of the area a middle-level
  45 * page table can map
  46 */
  47#define PMD_SHIFT       21
  48#define PTRS_PER_PMD    512
  49
  50/*
  51 * entries per page directory level
  52 */
  53#define PTRS_PER_PTE    512
  54
  55#ifndef __ASSEMBLY__
  56
  57#define pte_ERROR(e)                                    \
  58        printk("%s:%d: bad pte %p(%016lx).\n",          \
  59               __FILE__, __LINE__, &(e), pte_val(e))
  60#define pmd_ERROR(e)                                    \
  61        printk("%s:%d: bad pmd %p(%016lx).\n",          \
  62               __FILE__, __LINE__, &(e), pmd_val(e))
  63#define pud_ERROR(e)                                    \
  64        printk("%s:%d: bad pud %p(%016lx).\n",          \
  65               __FILE__, __LINE__, &(e), pud_val(e))
  66#define pgd_ERROR(e)                                    \
  67        printk("%s:%d: bad pgd %p(%016lx).\n",          \
  68               __FILE__, __LINE__, &(e), pgd_val(e))
  69
  70#define pgd_none(x)     (!pgd_val(x))
  71#define pud_none(x)     (!pud_val(x))
  72
  73struct mm_struct;
  74
  75void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
  76
  77
  78static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
  79                                    pte_t *ptep)
  80{
  81        *ptep = native_make_pte(0);
  82}
  83
  84static inline void native_set_pte(pte_t *ptep, pte_t pte)
  85{
  86        *ptep = pte;
  87}
  88
  89static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
  90{
  91        native_set_pte(ptep, pte);
  92}
  93
  94static inline pte_t native_ptep_get_and_clear(pte_t *xp)
  95{
  96#ifdef CONFIG_SMP
  97        return native_make_pte(xchg(&xp->pte, 0));
  98#else
  99        /* native_local_ptep_get_and_clear,
 100           but duplicated because of cyclic dependency */
 101        pte_t ret = *xp;
 102        native_pte_clear(NULL, 0, xp);
 103        return ret;
 104#endif
 105}
 106
 107static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 108{
 109        *pmdp = pmd;
 110}
 111
 112static inline void native_pmd_clear(pmd_t *pmd)
 113{
 114        native_set_pmd(pmd, native_make_pmd(0));
 115}
 116
 117static inline void native_set_pud(pud_t *pudp, pud_t pud)
 118{
 119        *pudp = pud;
 120}
 121
 122static inline void native_pud_clear(pud_t *pud)
 123{
 124        native_set_pud(pud, native_make_pud(0));
 125}
 126
 127static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
 128{
 129        *pgdp = pgd;
 130}
 131
 132static inline void native_pgd_clear(pgd_t *pgd)
 133{
 134        native_set_pgd(pgd, native_make_pgd(0));
 135}
 136
 137#define pte_same(a, b)          ((a).pte == (b).pte)
 138
 139#endif /* !__ASSEMBLY__ */
 140
 141#define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
 142#define PMD_MASK        (~(PMD_SIZE - 1))
 143#define PUD_SIZE        (_AC(1, UL) << PUD_SHIFT)
 144#define PUD_MASK        (~(PUD_SIZE - 1))
 145#define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
 146#define PGDIR_MASK      (~(PGDIR_SIZE - 1))
 147
 148
 149#define MAXMEM           _AC(0x00003fffffffffff, UL)
 150#define VMALLOC_START    _AC(0xffffc20000000000, UL)
 151#define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
 152#define VMEMMAP_START    _AC(0xffffe20000000000, UL)
 153#define MODULES_VADDR    _AC(0xffffffffa0000000, UL)
 154#define MODULES_END      _AC(0xffffffffff000000, UL)
 155#define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 156
 157#ifndef __ASSEMBLY__
 158
 159static inline int pgd_bad(pgd_t pgd)
 160{
 161        return (pgd_val(pgd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 162}
 163
 164static inline int pud_bad(pud_t pud)
 165{
 166        return (pud_val(pud) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 167}
 168
 169static inline int pmd_bad(pmd_t pmd)
 170{
 171        return (pmd_val(pmd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
 172}
 173
 174#define pte_none(x)     (!pte_val((x)))
 175#define pte_present(x)  (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 176
 177#define pages_to_mb(x)  ((x) >> (20 - PAGE_SHIFT))   /* FIXME: is this right? */
 178
 179/*
 180 * Macro to mark a page protection value as "uncacheable".
 181 */
 182#define pgprot_noncached(prot)                                  \
 183        (__pgprot(pgprot_val((prot)) | _PAGE_PCD | _PAGE_PWT))
 184
 185/*
 186 * Conversion functions: convert a page and protection to a page entry,
 187 * and a page entry and page directory to the page they refer to.
 188 */
 189
 190/*
 191 * Level 4 access.
 192 */
 193#define pgd_page_vaddr(pgd)                                             \
 194        ((unsigned long)__va((unsigned long)pgd_val((pgd)) & PTE_PFN_MASK))
 195#define pgd_page(pgd)           (pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
 196#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
 197static inline int pgd_large(pgd_t pgd) { return 0; }
 198#define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 199
 200/* PUD - Level3 access */
 201/* to find an entry in a page-table-directory. */
 202#define pud_page_vaddr(pud)                                             \
 203        ((unsigned long)__va(pud_val((pud)) & PHYSICAL_PAGE_MASK))
 204#define pud_page(pud)   (pfn_to_page(pud_val((pud)) >> PAGE_SHIFT))
 205#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
 206#define pud_offset(pgd, address)                                        \
 207        ((pud_t *)pgd_page_vaddr(*(pgd)) + pud_index((address)))
 208#define pud_present(pud) (pud_val((pud)) & _PAGE_PRESENT)
 209
 210static inline int pud_large(pud_t pte)
 211{
 212        return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 213                (_PAGE_PSE | _PAGE_PRESENT);
 214}
 215
 216/* PMD  - Level 2 access */
 217#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val((pmd)) & PTE_PFN_MASK))
 218#define pmd_page(pmd)           (pfn_to_page(pmd_val((pmd)) >> PAGE_SHIFT))
 219
 220#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 221#define pmd_offset(dir, address) ((pmd_t *)pud_page_vaddr(*(dir)) + \
 222                                  pmd_index(address))
 223#define pmd_none(x)     (!pmd_val((x)))
 224#define pmd_present(x)  (pmd_val((x)) & _PAGE_PRESENT)
 225#define pfn_pmd(nr, prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val((prot))))
 226#define pmd_pfn(x)  ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 227
 228#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 229#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |     \
 230                                            _PAGE_FILE })
 231#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 232
 233/* PTE - Level 1 access. */
 234
 235/* page, protection -> pte */
 236#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn((page)), (pgprot))
 237
 238#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 239#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
 240                                         pte_index((address)))
 241
 242/* x86-64 always has all page tables mapped. */
 243#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 244#define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
 245#define pte_unmap(pte) /* NOP */
 246#define pte_unmap_nested(pte) /* NOP */
 247
 248#define update_mmu_cache(vma, address, pte) do { } while (0)
 249
 250extern int direct_gbpages;
 251
 252/* Encode and de-code a swap entry */
 253#define __swp_type(x)                   (((x).val >> 1) & 0x3f)
 254#define __swp_offset(x)                 ((x).val >> 8)
 255#define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | \
 256                                                         ((offset) << 8) })
 257#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
 258#define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
 259
 260extern int kern_addr_valid(unsigned long addr);
 261extern void cleanup_highmap(void);
 262
 263#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 264        remap_pfn_range(vma, vaddr, pfn, size, prot)
 265
 266#define HAVE_ARCH_UNMAPPED_AREA
 267#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 268
 269#define pgtable_cache_init()   do { } while (0)
 270#define check_pgt_cache()      do { } while (0)
 271
 272#define PAGE_AGP    PAGE_KERNEL_NOCACHE
 273#define HAVE_PAGE_AGP 1
 274
 275/* fs/proc/kcore.c */
 276#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 277#define kc_offset_to_vaddr(o)                           \
 278        (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1)))    \
 279         ? ((o) | ~__VIRTUAL_MASK)                      \
 280         : (o))
 281
 282#define __HAVE_ARCH_PTE_SAME
 283#endif /* !__ASSEMBLY__ */
 284
 285#endif /* _ASM_X86_PGTABLE_64_H */
 286
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