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    Subject[patch 6/7] powerpc: implement pte_special
    Implement PTE_SPECIAL for powerpc. At the moment I only have a spare bit for
    the 4k pages config, but Ben has freed up another one for 64k pages that I
    can use, so this patch should include that before it goes upstream.

    Signed-off-by: Nick Piggin <npiggin@suse.de>
    ---
    Index: linux-2.6/include/asm-powerpc/pgtable-ppc64.h
    ===================================================================
    --- linux-2.6.orig/include/asm-powerpc/pgtable-ppc64.h
    +++ linux-2.6/include/asm-powerpc/pgtable-ppc64.h
    @@ -239,7 +239,7 @@ static inline int pte_write(pte_t pte) {
    static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;}
    static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;}
    static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE;}
    -static inline int pte_special(pte_t pte) { return 0; }
    +static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }

    static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
    static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; }
    @@ -259,7 +259,7 @@ static inline pte_t pte_mkyoung(pte_t pt
    static inline pte_t pte_mkhuge(pte_t pte) {
    return pte; }
    static inline pte_t pte_mkspecial(pte_t pte) {
    - return pte; }
    + pte_val(pte) |= _PAGE_SPECIAL; return pte; }

    /* Atomic PTE updates */
    static inline unsigned long pte_update(struct mm_struct *mm,
    Index: linux-2.6/include/asm-powerpc/pgtable-4k.h
    ===================================================================
    --- linux-2.6.orig/include/asm-powerpc/pgtable-4k.h
    +++ linux-2.6/include/asm-powerpc/pgtable-4k.h
    @@ -45,6 +45,8 @@
    #define _PAGE_GROUP_IX 0x7000 /* software: HPTE index within group */
    #define _PAGE_F_SECOND _PAGE_SECONDARY
    #define _PAGE_F_GIX _PAGE_GROUP_IX
    +#define _PAGE_SPECIAL 0x10000 /* software: special page */
    +#define __HAVE_ARCH_PTE_SPECIAL

    /* PTE flags to conserve for HPTE identification */
    #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \
    Index: linux-2.6/include/asm-powerpc/pgtable-64k.h
    ===================================================================
    --- linux-2.6.orig/include/asm-powerpc/pgtable-64k.h
    +++ linux-2.6/include/asm-powerpc/pgtable-64k.h
    @@ -74,6 +74,7 @@ static inline struct subpage_prot_table
    #define _PAGE_HPTE_SUB0 0x08000000 /* combo only: first sub page */
    #define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */
    #define _PAGE_4K_PFN 0x20000000 /* PFN is for a single 4k page */
    +#define _PAGE_SPECIAL 0x0 /* don't have enough room for this yet */

    /* Note the full page bits must be in the same location as for normal
    * 4k pages as the same asssembly will be used to insert 64K pages
    --



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