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#ifndef _I386_PGALLOC_H

#define _I386_PGALLOC_H

#include <linux/config.h>

#include <asm/processor.h>

#include <asm/fixmap.h>

#include <linux/threads.h>

#define pgd_quicklist (current_cpu_data.pgd_quick)

#define pmd_quicklist (current_cpu_data.pmd_quick)

#define pte_quicklist (current_cpu_data.pte_quick)

#define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)

#define pmd_populate(mm, pmd, pte) \

                set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))

/*

 * Allocate and free page tables.

 */

#if defined (CONFIG_X86_PAE)

/*

 * We can't include <linux/slab.h> here, thus these uglinesses.

 */

struct kmem_cache_s;

extern struct kmem_cache_s *pae_pgd_cachep;

extern void *kmem_cache_alloc(struct kmem_cache_s *, int);

extern void kmem_cache_free(struct kmem_cache_s *, void *);

static inline pgd_t *get_pgd_slow(void)

{

        int i;

        pgd_t *pgd = kmem_cache_alloc(pae_pgd_cachep, GFP_KERNEL);

        if (pgd) {

                for (i = 0; i < USER_PTRS_PER_PGD; i++) {

                        unsigned long pmd = __get_free_page(GFP_KERNEL);

                        if (!pmd)

                                goto out_oom;

                        clear_page(pmd);

                        set_pgd(pgd + i, __pgd(1 + __pa(pmd)));

                }

                memcpy(pgd + USER_PTRS_PER_PGD,

                        swapper_pg_dir + USER_PTRS_PER_PGD,

                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));

        }

        return pgd;

out_oom:

        for (i--; i >= 0; i--)

                free_page((unsigned long)__va(pgd_val(pgd[i])-1));

        kmem_cache_free(pae_pgd_cachep, pgd);

        return NULL;

}

#else

static inline pgd_t *get_pgd_slow(void)

{

        pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);

        if (pgd) {

                memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));

                memcpy(pgd + USER_PTRS_PER_PGD,

                        swapper_pg_dir + USER_PTRS_PER_PGD,

                        (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));

        }

        return pgd;

}

#endif /* CONFIG_X86_PAE */

static inline pgd_t *get_pgd_fast(void)

{

        unsigned long *ret;

        if ((ret = pgd_quicklist) != NULL) {

                pgd_quicklist = (unsigned long *)(*ret);

                ret[0] = 0;

                pgtable_cache_size--;

        } else

                ret = (unsigned long *)get_pgd_slow();

        return (pgd_t *)ret;

}

static inline void free_pgd_fast(pgd_t *pgd)

{

        *(unsigned long *)pgd = (unsigned long) pgd_quicklist;

        pgd_quicklist = (unsigned long *) pgd;

        pgtable_cache_size++;

}

static inline void free_pgd_slow(pgd_t *pgd)

{

#if defined(CONFIG_X86_PAE)

        int i;

        for (i = 0; i < USER_PTRS_PER_PGD; i++)

                free_page((unsigned long)__va(pgd_val(pgd[i])-1));

        kmem_cache_free(pae_pgd_cachep, pgd);

#else

        free_page((unsigned long)pgd);

#endif

}

static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address)

{

        pte_t *pte;

        pte = (pte_t *) __get_free_page(GFP_KERNEL);

        if (pte)

                clear_page(pte);

        return pte;

}

static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm,

                                        unsigned long address)

{

        unsigned long *ret;

        if ((ret = (unsigned long *)pte_quicklist) != NULL) {

                pte_quicklist = (unsigned long *)(*ret);

                ret[0] = ret[1];

                pgtable_cache_size--;

        }

        return (pte_t *)ret;

}

static inline void pte_free_fast(pte_t *pte)

{

        *(unsigned long *)pte = (unsigned long) pte_quicklist;

        pte_quicklist = (unsigned long *) pte;

        pgtable_cache_size++;

}

static __inline__ void pte_free_slow(pte_t *pte)

{

        free_page((unsigned long)pte);

}

#define pte_free(pte)           pte_free_fast(pte)

#define pgd_free(pgd)           free_pgd_slow(pgd)

#define pgd_alloc(mm)           get_pgd_fast()

/*

 * allocating and freeing a pmd is trivial: the 1-entry pmd is

 * inside the pgd, so has no extra memory associated with it.

 * (In the PAE case we free the pmds as part of the pgd.)

 */

#define pmd_alloc_one_fast(mm, addr)    ({ BUG(); ((pmd_t *)1); })

#define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })

#define pmd_free_slow(x)                do { } while (0)

#define pmd_free_fast(x)                do { } while (0)

#define pmd_free(x)                     do { } while (0)

#define pgd_populate(mm, pmd, pte)      BUG()

extern int do_check_pgt_cache(int, int);

/*

 * TLB flushing:

 *

 *  - flush_tlb() flushes the current mm struct TLBs

 *  - flush_tlb_all() flushes all processes TLBs

 *  - flush_tlb_mm(mm) flushes the specified mm context TLB's

 *  - flush_tlb_page(vma, vmaddr) flushes one page

 *  - flush_tlb_range(mm, start, end) flushes a range of pages

 *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables

 *

 * ..but the i386 has somewhat limited tlb flushing capabilities,

 * and page-granular flushes are available only on i486 and up.

 */

#ifndef CONFIG_SMP

#define flush_tlb() __flush_tlb()

#define flush_tlb_all() __flush_tlb_all()

#define local_flush_tlb() __flush_tlb()

static inline void flush_tlb_mm(struct mm_struct *mm)

{

        if (mm == current->active_mm)

                __flush_tlb();

}

static inline void flush_tlb_page(struct vm_area_struct *vma,

        unsigned long addr)

{

        if (vma->vm_mm == current->active_mm)

                __flush_tlb_one(addr);

}

static inline void flush_tlb_range(struct mm_struct *mm,

        unsigned long start, unsigned long end)

{

        if (mm == current->active_mm)

                __flush_tlb();

}

#else

#include <asm/smp.h>

#define local_flush_tlb() \

        __flush_tlb()

extern void flush_tlb_all(void);

extern void flush_tlb_current_task(void);

extern void flush_tlb_mm(struct mm_struct *);

extern void flush_tlb_page(struct vm_area_struct *, unsigned long);

#define flush_tlb()     flush_tlb_current_task()

static inline void flush_tlb_range(struct mm_struct * mm, unsigned long start, unsigned long end)

{

        flush_tlb_mm(mm);

}

#define TLBSTATE_OK     1

#define TLBSTATE_LAZY   2

struct tlb_state

{

        struct mm_struct *active_mm;

        int state;

} ____cacheline_aligned;

extern struct tlb_state cpu_tlbstate[NR_CPUS];

#endif /* CONFIG_SMP */

static inline void flush_tlb_pgtables(struct mm_struct *mm,

                                      unsigned long start, unsigned long end)

{

        flush_tlb_mm(mm);

}

#endif /* _I386_PGALLOC_H */