Re: [PATCH 6/7] [RFC] enable early TLBs for BG/P
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2011-05-20 00:39:15
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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.
quoted hunk ↗ jump to hunk
Signed-off-by: Eric Van Hensbergen <redacted> --- 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))