Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#ifndef _OR32_PGALLOC_H

#define _OR32_PGALLOC_H

#include <asm/page.h>

#include <linux/threads.h>

#include <linux/mm.h>

#if 1

#define pmd_populate_kernel(mm, pmd, pte) \

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

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)

{

        set_pmd(pmd, __pmd(_KERNPG_TABLE +

                           ((unsigned long)page_to_pfn(pte) <<

                            (unsigned long) PAGE_SHIFT)));

}

#endif

#if 0

#define pmd_populate_kernel(mm, pmd, pte) \

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

#define pmd_populate(mm, pmd, pte) \

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

#endif

#if 0

/* __PHX__ check */

#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, pte)

#define pmd_populate(mm, pmd, pte) pmd_set(pmd, page_address(pte))

#endif 

#if 1

/*

 * Allocate and free page tables.

 */

extern inline pgd_t *pgd_alloc(struct mm_struct *mm)

{

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

        if (ret) {

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

                memcpy(ret + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD,

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

        }

        return ret;

}

#endif

#if 0

/* __PHX__ check, this is supposed to be 2.6 style, but

 * we use current_pgd (from mm->pgd) to load kernel pages

 * so we need it initialized.

 */

extern inline pgd_t *pgd_alloc (struct mm_struct *mm)

{

        return (pgd_t *)get_zeroed_page(GFP_KERNEL);

}

#endif

extern inline void pgd_free (pgd_t *pgd)

{

        free_page((unsigned long)pgd);

}

extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)

{

        pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);

        if (pte)

                clear_page(pte);

        return pte;

}

extern inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)

{

        struct page *pte;

        pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);

        if (pte)

                clear_page(page_address(pte));

        return pte;

}

extern inline void pte_free_kernel(pte_t *pte)

{

        free_page((unsigned long)pte);

}

extern inline void pte_free(struct page *pte)

{

        __free_page(pte);

}

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

/*

 * We don't have any real pmd's, and this code never triggers because

 * the pgd will always be present..

 */

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

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

#define __pmd_free_tlb(tlb,x)      do { } while (0)

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

#define check_pgt_cache()          do { } while (0)

#endif