#ifndef _X86_64_PGALLOC_H#define _X86_64_PGALLOC_H #include <asm/fixmap.h>#include <asm/pda.h>#include <linux/threads.h>#include <linux/mm.h> #define pmd_populate_kernel(mm, pmd, pte) \		set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))#define pud_populate(mm, pud, pmd) \		set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)))#define pgd_populate(mm, pgd, pud) \		set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud))) static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte){	set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));} static inline void pmd_free(pmd_t *pmd){	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));	free_page((unsigned long)pmd);} static 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 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 (pud_t *pud){	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));	free_page((unsigned long)pud);} static inline void pgd_list_add(pgd_t *pgd){	struct page *page = virt_to_page(pgd); 	spin_lock(&pgd_lock);	page->index = (pgoff_t)pgd_list;	if (pgd_list)		pgd_list->private = (unsigned long)&page->index;	pgd_list = page;	page->private = (unsigned long)&pgd_list;	spin_unlock(&pgd_lock);} static inline void pgd_list_del(pgd_t *pgd){	struct page *next, **pprev, *page = virt_to_page(pgd); 	spin_lock(&pgd_lock);	next = (struct page *)page->index;	pprev = (struct page **)page->private;	*pprev = next;	if (next)		next->private = (unsigned long)pprev;	spin_unlock(&pgd_lock);} static inline pgd_t *pgd_alloc(struct mm_struct *mm){	unsigned boundary;	pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);	if (!pgd)		return NULL;	pgd_list_add(pgd);	/*	 * Copy kernel pointers in from init.	 * Could keep a freelist or slab cache of those because the kernel	 * part never changes.	 */	boundary = pgd_index(__PAGE_OFFSET);	memset(pgd, 0, boundary * sizeof(pgd_t));	memcpy(pgd + boundary,	       init_level4_pgt + boundary,	       (PTRS_PER_PGD - boundary) * sizeof(pgd_t));	return pgd;} static inline void pgd_free(pgd_t *pgd){	BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));	pgd_list_del(pgd);	free_page((unsigned long)pgd);} static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address){	return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);} static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address){	void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);	if (!p)		return NULL;	return virt_to_page(p);} /* 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(pte_t *pte){	BUG_ON((unsigned long)pte & (PAGE_SIZE-1));	free_page((unsigned long)pte); } static inline void pte_free(struct page *pte){	__free_page(pte);}  #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) #define __pmd_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x))#define __pud_free_tlb(tlb,x)   tlb_remove_page((tlb),virt_to_page(x)) #endif /* _X86_64_PGALLOC_H */