include/asm-i386/mach-xen/asm/pgalloc.h

   1 #ifndef _I386_PGALLOC_H
   2 #define _I386_PGALLOC_H
   3
   4 #include <asm/fixmap.h>
   5 #include <asm/desc.h>
   6 #include <linux/threads.h>
   7 #include <linux/mm.h>           /* for struct page */
   8 #include <asm/io.h>             /* for phys_to_virt and page_to_pseudophys */
   9
  10 /* Is this pagetable pinned? */
  11 #define PG_pinned       PG_arch_1
  12
  13 #define pmd_populate_kernel(mm, pmd, pte) \
  14                 set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))
  15
  16 #define pmd_populate(mm, pmd, pte)                                      \
  17 do {                                                                    \
  18         if (test_bit(PG_pinned, &virt_to_page((mm)->pgd)->flags)) {     \
  19                 if (!PageHighMem(pte))                                  \
  20                         BUG_ON(HYPERVISOR_update_va_mapping(            \
  21                           (unsigned long)__va(page_to_pfn(pte)<<PAGE_SHIFT),\
  22                           pfn_pte(page_to_pfn(pte), PAGE_KERNEL_RO), 0));\
  23                 set_pmd(pmd, __pmd(_PAGE_TABLE +                        \
  24                         ((unsigned long long)page_to_pfn(pte) <<        \
  25                                 (unsigned long long) PAGE_SHIFT)));     \
  26         } else {                                                        \
  27                 *(pmd) = __pmd(_PAGE_TABLE +                            \
  28                         ((unsigned long long)page_to_pfn(pte) <<        \
  29                                 (unsigned long long) PAGE_SHIFT));      \
  30         }                                                               \
  31 } while (0)
  32
  33 /*
  34  * Allocate and free page tables.
  35  */
  36 extern pgd_t *pgd_alloc(struct mm_struct *);
  37 extern void pgd_free(pgd_t *pgd);
  38
  39 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  40 extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
  41
  42 static inline void pte_free_kernel(pte_t *pte)
  43 {
  44         free_page((unsigned long)pte);
  45         make_page_writable(pte, XENFEAT_writable_page_tables);
  46 }
  47
  48 extern void pte_free(struct page *pte);
  49
  50 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
  51
  52 #ifdef CONFIG_X86_PAE
  53 /*
  54  * In the PAE case we free the pmds as part of the pgd.
  55  */
  56 #define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
  57 #define pmd_free(x)                     do { } while (0)
  58 #define __pmd_free_tlb(tlb,x)           do { } while (0)
  59 #define pud_populate(mm, pmd, pte)      BUG()
  60 #endif
  61
  62 #define check_pgt_cache()       do { } while (0)
  63
  64 #endif /* _I386_PGALLOC_H */