#ifndef _ASM_X86_PGALLOC_H#define _ASM_X86_PGALLOC_H #include <linux/threads.h>#include <linux/mm.h>		/* for struct page */#include <linux/pagemap.h> #ifdef CONFIG_PARAVIRT#include <asm/paravirt.h>#elsestatic inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)	{}static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)	{}static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,					    unsigned long start, unsigned long count) {}static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)	{}static inline void paravirt_release_pte(unsigned long pfn) {}static inline void paravirt_release_pmd(unsigned long pfn) {}static inline void paravirt_release_pud(unsigned long pfn) {}#endif /* * Allocate and free page tables. */extern pgd_t *pgd_alloc(struct mm_struct *);extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long); /* Should really implement gc for free page table pages. This could be   done with a reference count in struct page. */ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte){	BUG_ON((unsigned long)pte & (PAGE_SIZE-1));	free_page((unsigned long)pte);} static inline void pte_free(struct mm_struct *mm, struct page *pte){	__free_page(pte);} extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte); static inline void pmd_populate_kernel(struct mm_struct *mm,				       pmd_t *pmd, pte_t *pte){	paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);	set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));} static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,				struct page *pte){	unsigned long pfn = page_to_pfn(pte); 	paravirt_alloc_pte(mm, pfn);	set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));} #define pmd_pgtable(pmd) pmd_page(pmd) #if PAGETABLE_LEVELS > 2static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr){	return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);} static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd){	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));	free_page((unsigned long)pmd);} extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); #ifdef CONFIG_X86_PAEextern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);#else	/* !CONFIG_X86_PAE */static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd){	paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);	set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));}#endif	/* CONFIG_X86_PAE */ #if PAGETABLE_LEVELS > 3static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud){	paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);	set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));} static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr){	return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);} static inline void pud_free(struct mm_struct *mm, pud_t *pud){	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));	free_page((unsigned long)pud);} extern void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);#endif	/* PAGETABLE_LEVELS > 3 */#endif	/* PAGETABLE_LEVELS > 2 */ #endif	/* _ASM_X86_PGALLOC_H */