Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965495AbbDQQdJ (ORCPT ); Fri, 17 Apr 2015 12:33:09 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:45028 "EHLO mailhub1.si.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754435AbbDQQdB (ORCPT ); Fri, 17 Apr 2015 12:33:01 -0400 Message-Id: In-Reply-To: References: Subject: [PATCH v5 4/5] powerpc/8xx: Use SPRG2 instead of DAR for saving r3 To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , scottwood@freescale.com Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Joakim Tjernlund Date: Fri, 17 Apr 2015 18:32:58 +0200 (CEST) From: christophe.leroy@c-s.fr (root) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1515 Lines: 57 We now have SPRG2 available as in it not used anymore for saving CR, so we don't need to crash DAR anymore for saving r3 for CPU6 ERRATA handling. Signed-off-by: Christophe Leroy --- arch/powerpc/kernel/head_8xx.S | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 150d03f..ba2dc53 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -309,7 +309,7 @@ SystemCall: InstructionTLBMiss: #ifdef CONFIG_8xx_CPU6 - mtspr SPRN_DAR, r3 + mtspr SPRN_SPRG_SCRATCH2, r3 #endif EXCEPTION_PROLOG_0 @@ -362,8 +362,7 @@ InstructionTLBMiss: /* Restore registers */ #ifdef CONFIG_8xx_CPU6 - mfspr r3, SPRN_DAR - mtspr SPRN_DAR, r11 /* Tag DAR */ + mfspr r3, SPRN_SPRG_SCRATCH2 #endif EXCEPTION_EPILOG_0 rfi @@ -371,7 +370,7 @@ InstructionTLBMiss: . = 0x1200 DataStoreTLBMiss: #ifdef CONFIG_8xx_CPU6 - mtspr SPRN_DAR, r3 + mtspr SPRN_SPRG_SCRATCH2, r3 #endif EXCEPTION_PROLOG_0 mfcr r10 @@ -438,7 +437,7 @@ DataStoreTLBMiss: /* Restore registers */ #ifdef CONFIG_8xx_CPU6 - mfspr r3, SPRN_DAR + mfspr r3, SPRN_SPRG_SCRATCH2 #endif mtspr SPRN_DAR, r11 /* Tag DAR */ EXCEPTION_EPILOG_0 -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/