Received: by 2002:a05:6a10:8c0a:0:0:0:0 with SMTP id go10csp2497245pxb; Tue, 9 Mar 2021 04:11:34 -0800 (PST) X-Google-Smtp-Source: ABdhPJwv1kMwf8SVZKnQu9jFJw1w+lZACPD1y/a17Bcdl6FcoLXIL6OxETQWwNKO+aJlWVB4E9ky X-Received: by 2002:aa7:c815:: with SMTP id a21mr3773929edt.38.1615291893907; Tue, 09 Mar 2021 04:11:33 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1615291893; cv=none; d=google.com; s=arc-20160816; b=Ug0Tf4PiXhYhiO5QYpkU6OE6kKOJIK06hGgVDoNR0bcXcSpGn69UmL9OhNuD6qyIl8 VGN3PSiagfrmXn/57Y5gkN+cAH/S4jdBQFl52xoowPLXabmfI72MrDPSThQVM6zf1mQ0 wQBsY2QsEVdrIopTC4ZzHDPMiEI8HjhQXprTnZPWa8FqGoqirNPQ0HlxNjjMfBLwvC2E yQ2Be5sOi17/EGTSkHv4iGTPH46Ny31QZbJJwVG3PCdMNyvu5L5NS/aI0Dwt4ymdkW4f Oew1WxAT90JSl++GgBYkhjwV5jiT6tX7unh01zX0dV1ynrYAEGP1KkmQltJd6IK44Plw SFXA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:date:cc:to:subject:from:references:in-reply-to :message-id; bh=ZTRZUPV/1LSWclN1AdgpoPwzbzYMMa3RwmlZtJCNYnE=; b=ANLJMR1OmMHHnazy7n2wJpOCGx9CB64/wvC+HSRmJFoXJXIMsDVQ0vQoZJ3odpeI5I DOhJeq+SI7ePo9a77TCV81VjP2H+IrN9urfJKt+fsAGrzGc3PcWgzGCvnBGq6BHalp/a TxeYE4lGJMmGatoOIKGF30/YxqM8L5oGHfnAT73TCaoPhfnPNy3QaOklnVhH6yOEJq9L GE25jM9B3mvGsGgW4lDLiZrQeNJCyJtsNxEqCyBxS1yI8er5yiEemFr39YkS+GeLl+GD sVBPHjIz7zKVM59IQWzPYZURLcNytLntf1pJ0rq+NnswGBmt9nnnnbJ7chNu2DAZS/pX tv8Q== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id f11si8994097ejr.284.2021.03.09.04.11.11; Tue, 09 Mar 2021 04:11:33 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231300AbhCIMJz (ORCPT + 99 others); Tue, 9 Mar 2021 07:09:55 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:7297 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230422AbhCIMJj (ORCPT ); Tue, 9 Mar 2021 07:09:39 -0500 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4DvvCP2QM1z9tyjL; Tue, 9 Mar 2021 13:09:37 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id tsSriGYLLBjN; Tue, 9 Mar 2021 13:09:37 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4DvvCP17Npz9tyjF; Tue, 9 Mar 2021 13:09:37 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 830558B800; Tue, 9 Mar 2021 13:09:38 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id aV4NVXJZr7WB; Tue, 9 Mar 2021 13:09:38 +0100 (CET) Received: from po16121vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 344598B7FC; Tue, 9 Mar 2021 13:09:38 +0100 (CET) Received: by po16121vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 16E1C67555; Tue, 9 Mar 2021 12:09:38 +0000 (UTC) Message-Id: <40631d732d33e0e50b89d97402fce9ede4123d80.1615291472.git.christophe.leroy@csgroup.eu> In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v2 12/43] powerpc/32: Use fast instruction to set MSR RI in exception prolog on 8xx To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , npiggin@gmail.com Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Date: Tue, 9 Mar 2021 12:09:38 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 8xx has registers SPRN_NRI, SPRN_EID and SPRN_EIE for changing MSR EE and RI. Use SPRN_EID in exception prolog to set RI. On an 8xx, it reduces the null_syscall test by 3 cycles. Signed-off-by: Christophe Leroy --- arch/powerpc/kernel/head_32.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h index ac6b391f1493..25ee6b26ef5a 100644 --- a/arch/powerpc/kernel/head_32.h +++ b/arch/powerpc/kernel/head_32.h @@ -107,6 +107,8 @@ #endif #ifdef CONFIG_40x rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */ +#elif defined(CONFIG_PPC_8xx) + mtspr SPRN_EID, r2 /* Set MSR_RI */ #else #ifdef CONFIG_VMAP_STACK li r10, MSR_KERNEL & ~MSR_IR /* can take exceptions */ -- 2.25.0