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    SubjectRe: [PATCH 6/7] [RFC] enable early TLBs for BG/P
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    On Wed, 2011-05-18 at 16:24 -0500, Eric Van Hensbergen wrote:
    > BG/P maps firmware with an early TLB

    That's a bit gross. How often do you call that firmware in practice ?
    Aren't you better off instead inserting a TLB entry for it when you call
    it instead ? A simple tlbsx. + tlbwe sequence would do. That would free
    up a TLB entry for normal use.

    Cheers,
    Ben.

    > Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
    > ---
    > arch/powerpc/include/asm/mmu-44x.h | 6 +++++-
    > 1 files changed, 5 insertions(+), 1 deletions(-)
    >
    > diff --git a/arch/powerpc/include/asm/mmu-44x.h b/arch/powerpc/include/asm/mmu-44x.h
    > index ca1b90c..2807d6e 100644
    > --- a/arch/powerpc/include/asm/mmu-44x.h
    > +++ b/arch/powerpc/include/asm/mmu-44x.h
    > @@ -115,8 +115,12 @@ typedef struct {
    > #endif /* !__ASSEMBLY__ */
    >
    > #ifndef CONFIG_PPC_EARLY_DEBUG_44x
    > +#ifndef CONFIG_BGP
    > #define PPC44x_EARLY_TLBS 1
    > -#else
    > +#else /* CONFIG_BGP */
    > +#define PPC44x_EARLY_TLBS 2
    > +#endif /* CONFIG_BGP */
    > +#else /* CONFIG_PPC_EARLY_DEBUG_44x */
    > #define PPC44x_EARLY_TLBS 2
    > #define PPC44x_EARLY_DEBUG_VIRTADDR (ASM_CONST(0xf0000000) \
    > | (ASM_CONST(CONFIG_PPC_EARLY_DEBUG_44x_PHYSLOW) & 0xffff))




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