From 82622284dd2f8791f9759f3cef601520a8bc63b2 Mon Sep 17 00:00:00 2001 From: David Daney Date: Wed, 14 Oct 2009 12:16:56 -0700 Subject: MIPS: Put PGD in C0_CONTEXT for 64-bit R2 processors. Processors that support the mips64r2 ISA can in four instructions convert a shifted PGD pointer stored in the upper bits of c0_context into a usable pointer. By doing this we save a memory load and associated potential cache miss in the TLB exception handlers. Since the upper bits of c0_context were holding the CPU number, we move this to the upper bits of c0_xcontext which doesn't have enough bits to hold the PGD pointer, but has plenty for the CPU number. Signed-off-by: David Daney Signed-off-by: Ralf Baechle --- arch/mips/include/asm/stackframe.h | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) (limited to 'arch/mips/include/asm/stackframe.h') diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h index dd7e220..3b6da33 100644 --- a/arch/mips/include/asm/stackframe.h +++ b/arch/mips/include/asm/stackframe.h @@ -87,15 +87,19 @@ #ifdef CONFIG_SMP #ifdef CONFIG_MIPS_MT_SMTC #define PTEBASE_SHIFT 19 /* TCBIND */ +#define CPU_ID_REG CP0_TCBIND +#define CPU_ID_MFC0 mfc0 +#elif defined(CONFIG_MIPS_PGD_C0_CONTEXT) +#define PTEBASE_SHIFT 48 /* XCONTEXT */ +#define CPU_ID_REG CP0_XCONTEXT +#define CPU_ID_MFC0 MFC0 #else #define PTEBASE_SHIFT 23 /* CONTEXT */ +#define CPU_ID_REG CP0_CONTEXT +#define CPU_ID_MFC0 MFC0 #endif .macro get_saved_sp /* SMP variation */ -#ifdef CONFIG_MIPS_MT_SMTC - mfc0 k0, CP0_TCBIND -#else - MFC0 k0, CP0_CONTEXT -#endif + CPU_ID_MFC0 k0, CPU_ID_REG #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) lui k1, %hi(kernelsp) #else @@ -111,11 +115,7 @@ .endm .macro set_saved_sp stackp temp temp2 -#ifdef CONFIG_MIPS_MT_SMTC - mfc0 \temp, CP0_TCBIND -#else - MFC0 \temp, CP0_CONTEXT -#endif + CPU_ID_MFC0 \temp, CPU_ID_REG LONG_SRL \temp, PTEBASE_SHIFT LONG_S \stackp, kernelsp(\temp) .endm -- cgit v1.1