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

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