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#ifndef _X86_64_PGALLOC_H
#define _X86_64_PGALLOC_H

#include <asm/processor.h>
#include <asm/fixmap.h>
#include <asm/pda.h>
#include <linux/threads.h>
#include <linux/mm.h>
#include <asm/io.h>		/* for phys_to_virt and page_to_pseudophys */

void make_page_readonly(void *va);
void make_page_writable(void *va);
void make_pages_readonly(void *va, unsigned int nr);
void make_pages_writable(void *va, unsigned int nr);

#define __user_pgd(pgd) ((pgd) + PTRS_PER_PGD)

static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
{
	set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)));
}

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 pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
}

/*
 * We need to use the batch mode here, but pgd_pupulate() won't be
 * be called frequently.
 */
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
{
        set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
        set_pgd(__user_pgd(pgd), __pgd(_PAGE_TABLE | __pa(pud)));
}

extern __inline__ pmd_t *get_pmd(void)
{
        pmd_t *pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
        if (!pmd)
		return NULL;
        make_page_readonly(pmd);
        xen_pmd_pin(__pa(pmd));
	return pmd;
}

extern __inline__ void pmd_free(pmd_t *pmd)
{
	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
        xen_pmd_unpin(__pa(pmd));
        make_page_writable(pmd);
	free_page((unsigned long)pmd);
}

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
        pmd_t *pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
        if (!pmd)
		return NULL;
        make_page_readonly(pmd);
        xen_pmd_pin(__pa(pmd)); 
        return pmd;
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
        pud_t *pud = (pud_t *) get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
        if (!pud)
		return NULL;
        make_page_readonly(pud);
        xen_pud_pin(__pa(pud)); 
        return pud;
}

static inline void pud_free(pud_t *pud)


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