Subversion Repositories or1k

/*

 *  linux/include/asm-arm/proc-armv/pgalloc.h

 *

 *  Copyright (C) 2001 Russell King

 *

 * Page table allocation/freeing primitives for 32-bit ARM processors.

 */

/* unfortunately, this includes linux/mm.h and the rest of the universe. */

#include <linux/slab.h>

extern kmem_cache_t *pte_cache;

/*

 * Allocate one PTE table.

 *

 * Note that we keep the processor copy of the PTE entries separate

 * from the Linux copy.  The processor copies are offset by -PTRS_PER_PTE

 * words from the Linux copy.

 */

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

{

        pte_t *pte;

        pte = kmem_cache_alloc(pte_cache, GFP_KERNEL);

        if (pte)

                pte += PTRS_PER_PTE;

        return pte;

}

/*

 * Free one PTE table.

 */

static inline void pte_free_slow(pte_t *pte)

{

        if (pte) {

                pte -= PTRS_PER_PTE;

                kmem_cache_free(pte_cache, pte);

        }

}

/*

 * Populate the pmdp entry with a pointer to the pte.  This pmd is part

 * of the mm address space.

 *

 * If 'mm' is the init tasks mm, then we are doing a vmalloc, and we

 * need to set stuff up correctly for it.

 */

#define pmd_populate(mm,pmdp,pte)                       \

        do {                                            \

                unsigned long __prot;                   \

                if (mm == &init_mm)                     \

                        __prot = _PAGE_KERNEL_TABLE;    \

                else                                    \

                        __prot = _PAGE_USER_TABLE;      \

                set_pmd(pmdp, __mk_pmd(pte, __prot));   \

        } while (0)