source: trunk/packages/xen-common/xen-common/linux-2.6-xen-sparse/include/asm-ia64/pgalloc.h @ 34

#ifndef _ASM_IA64_PGALLOC_H
#define _ASM_IA64_PGALLOC_H

/*
 * This file contains the functions and defines necessary to allocate
 * page tables.
 *
 * This hopefully works with any (fixed) ia-64 page-size, as defined
 * in <asm/page.h> (currently 8192).
 *
 * Copyright (C) 1998-2001 Hewlett-Packard Co
 *      David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 2000, Goutham Rao <goutham.rao@intel.com>
 */


#include <linux/compiler.h>
#include <linux/mm.h>
#include <linux/page-flags.h>
#include <linux/threads.h>

#include <asm/mmu_context.h>

DECLARE_PER_CPU(unsigned long *, __pgtable_quicklist);
#define pgtable_quicklist __ia64_per_cpu_var(__pgtable_quicklist)
DECLARE_PER_CPU(long, __pgtable_quicklist_size);
#define pgtable_quicklist_size __ia64_per_cpu_var(__pgtable_quicklist_size)

static inline long pgtable_quicklist_total_size(void)
{
        long ql_size = 0;
        int cpuid;

        for_each_online_cpu(cpuid) {
                ql_size += per_cpu(__pgtable_quicklist_size, cpuid);
        }
        return ql_size;
}

static inline void *pgtable_quicklist_alloc(void)
{
        unsigned long *ret = NULL;

        preempt_disable();

        ret = pgtable_quicklist;
        if (likely(ret != NULL)) {
                pgtable_quicklist = (unsigned long *)(*ret);
                ret[0] = 0;
                --pgtable_quicklist_size;
                preempt_enable();
        } else {
                preempt_enable();
                ret = (unsigned long *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
        }

        return ret;
}

static inline void pgtable_quicklist_free(void *pgtable_entry)
{
#ifdef CONFIG_NUMA
        unsigned long nid = page_to_nid(virt_to_page(pgtable_entry));

        if (unlikely(nid != numa_node_id())) {
                free_page((unsigned long)pgtable_entry);
                return;
        }
#endif

        preempt_disable();
        *(unsigned long *)pgtable_entry = (unsigned long)pgtable_quicklist;
        pgtable_quicklist = (unsigned long *)pgtable_entry;
        ++pgtable_quicklist_size;
        preempt_enable();
}

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
        return pgtable_quicklist_alloc();
}

static inline void pgd_free(pgd_t * pgd)
{
        pgtable_quicklist_free(pgd);
}

#ifdef CONFIG_PGTABLE_4
static inline void
pgd_populate(struct mm_struct *mm, pgd_t * pgd_entry, pud_t * pud)
{
        pgd_val(*pgd_entry) = __pa(pud);
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
        return pgtable_quicklist_alloc();
}

static inline void pud_free(pud_t * pud)
{
        pgtable_quicklist_free(pud);
}
#define __pud_free_tlb(tlb, pud)        pud_free(pud)
#endif /* CONFIG_PGTABLE_4 */

static inline void
pud_populate(struct mm_struct *mm, pud_t * pud_entry, pmd_t * pmd)
{
        pud_val(*pud_entry) = __pa(pmd);
}

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
        return pgtable_quicklist_alloc();
}

static inline void pmd_free(pmd_t * pmd)
{
        pgtable_quicklist_free(pmd);
}

#define __pmd_free_tlb(tlb, pmd)        pmd_free(pmd)

static inline void
pmd_populate(struct mm_struct *mm, pmd_t * pmd_entry, struct page *pte)
{
#ifndef CONFIG_XEN
        pmd_val(*pmd_entry) = page_to_phys(pte);
#else
        pmd_val(*pmd_entry) = page_to_pseudophys(pte);
#endif
}

static inline void
pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmd_entry, pte_t * pte)
{
        pmd_val(*pmd_entry) = __pa(pte);
}

static inline struct page *pte_alloc_one(struct mm_struct *mm,
                                         unsigned long addr)
{
        return virt_to_page(pgtable_quicklist_alloc());
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
                                          unsigned long addr)
{
        return pgtable_quicklist_alloc();
}

static inline void pte_free(struct page *pte)
{
        pgtable_quicklist_free(page_address(pte));
}

static inline void pte_free_kernel(pte_t * pte)
{
        pgtable_quicklist_free(pte);
}

#define __pte_free_tlb(tlb, pte)        pte_free(pte)

extern void check_pgt_cache(void);

#endif                          /* _ASM_IA64_PGALLOC_H */