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/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 1994 - 2001 by Ralf Baechle at alii

 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.

 */

#ifndef _ASM_PGALLOC_H

#define _ASM_PGALLOC_H

#include <linux/config.h>

/* TLB flushing:

 *

 *  - flush_tlb_all() flushes all processes TLB entries

 *  - flush_tlb_mm(mm) flushes the specified mm context TLB entries

 *  - flush_tlb_page(mm, vmaddr) flushes a single page

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

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

 *  - flush_tlb_one(page) flushes a single kernel page

 */

extern void local_flush_tlb_all(void);

extern void local_flush_tlb_mm(struct mm_struct *mm);

extern void local_flush_tlb_range(struct mm_struct *mm, unsigned long start,

                               unsigned long end);

extern void local_flush_tlb_page(struct vm_area_struct *vma,

                                 unsigned long page);

extern void local_flush_tlb_one(unsigned long page);

#ifdef CONFIG_SMP

extern void flush_tlb_all(void);

extern void flush_tlb_mm(struct mm_struct *);

extern void flush_tlb_range(struct mm_struct *, unsigned long, unsigned long);

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

#else /* CONFIG_SMP */

#define flush_tlb_all()                 local_flush_tlb_all()

#define flush_tlb_mm(mm)                local_flush_tlb_mm(mm)

#define flush_tlb_range(mm,vmaddr,end)  local_flush_tlb_range(mm, vmaddr, end)

#define flush_tlb_page(vma,page)        local_flush_tlb_page(vma, page)

#endif /* CONFIG_SMP */

static inline void flush_tlb_pgtables(struct mm_struct *mm,

                                      unsigned long start, unsigned long end)

{

        /* Nothing to do on MIPS.  */

}

/*

 * Allocate and free page tables.

 */

#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)      pmd_set(pmd, pte)

#define pgd_populate(mm, pgd, pmd)      pgd_set(pgd, pmd)

extern pgd_t *get_pgd_slow(void);

static inline pgd_t *get_pgd_fast(void)

{

        unsigned long *ret;

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

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

                ret[0] = ret[1];

                pgtable_cache_size--;

                return (pgd_t *)ret;

        }

        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)

{

        free_pages((unsigned long)pgd, PGD_ORDER);

}

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

{

        pte_t *pte;

        pte = (pte_t *) __get_free_pages(GFP_KERNEL, PTE_ORDER);

        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;

}

extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);

static inline pte_t *get_pte_fast(void)

{

        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 free_pte_fast(pte_t *pte)

{

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

        pte_quicklist = (unsigned long *) pte;

        pgtable_cache_size++;

}

static inline void free_pte_slow(pte_t *pte)

{

        free_pages((unsigned long)pte, PTE_ORDER);

}

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)

{

        pmd_t *pmd;

        pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ORDER);

        if (pmd)

                pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);

        return pmd;

}

static inline pmd_t *pmd_alloc_one_fast(struct mm_struct *mm, unsigned long address)

{

        unsigned long *ret;

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

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

                ret[0] = ret[1];

                pgtable_cache_size--;

        }

        return (pmd_t *)ret;

}

extern pmd_t *get_pmd_slow(pgd_t *pgd, unsigned long address_preadjusted);

static inline pmd_t *get_pmd_fast(void)

{

        unsigned long *ret;

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

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

                ret[0] = ret[1];

                pgtable_cache_size--;

                return (pmd_t *)ret;

        }

        return (pmd_t *)ret;

}

static inline void free_pmd_fast(pmd_t *pmd)

{

        *(unsigned long *)pmd = (unsigned long) pmd_quicklist;

        pmd_quicklist = (unsigned long *) pmd;

        pgtable_cache_size++;

}

static inline void free_pmd_slow(pmd_t *pmd)

{

        free_pages((unsigned long)pmd, PMD_ORDER);

}

#define pte_free(pte)           free_pte_fast(pte)

#define pmd_free(pte)           free_pmd_fast(pte)

#define pgd_free(pgd)           free_pgd_fast(pgd)

#define pgd_alloc(mm)           get_pgd_fast()

extern pte_t kptbl[(PAGE_SIZE << PGD_ORDER)/sizeof(pte_t)];

extern pmd_t kpmdtbl[PTRS_PER_PMD];

extern int do_check_pgt_cache(int, int);

#endif /* _ASM_PGALLOC_H */