From patchwork Tue Feb 16 15:49:22 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Morse X-Patchwork-Id: 8328521 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id F368E9F38B for ; Tue, 16 Feb 2016 15:51:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2676F202B8 for ; Tue, 16 Feb 2016 15:51:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5E2C1202AE for ; Tue, 16 Feb 2016 15:51:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755436AbcBPPvy (ORCPT ); Tue, 16 Feb 2016 10:51:54 -0500 Received: from foss.arm.com ([217.140.101.70]:54511 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755294AbcBPPvy (ORCPT ); Tue, 16 Feb 2016 10:51:54 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 485773A1; Tue, 16 Feb 2016 07:51:04 -0800 (PST) Received: from melchizedek.cambridge.arm.com (melchizedek.cambridge.arm.com [10.1.209.158]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CD88B3F213; Tue, 16 Feb 2016 07:51:51 -0800 (PST) From: James Morse To: linux-arm-kernel@lists.infradead.org Cc: Will Deacon , Sudeep Holla , Geoff Levand , Catalin Marinas , Lorenzo Pieralisi , Mark Rutland , AKASHI Takahiro , Marc Zyngier , "Rafael J . Wysocki" , Pavel Machek , linux-pm@vger.kernel.org, James Morse Subject: [PATCH v5 10/15] arm64: Add new asm macro copy_page Date: Tue, 16 Feb 2016 15:49:22 +0000 Message-Id: <1455637767-31561-11-git-send-email-james.morse@arm.com> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1455637767-31561-1-git-send-email-james.morse@arm.com> References: <1455637767-31561-1-git-send-email-james.morse@arm.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Geoff Levand Kexec and hibernate need to copy pages of memory, but may not have all of the kernel mapped, and are unable to call copy_page(). Add a simplistic copy_page() macro, that can be inlined in these situations. lib/copy_page.S provides a bigger better version, but uses more registers. Signed-off-by: Geoff Levand [Changed asm label to 9998, added commit message] Signed-off-by: James Morse --- This patch comes from v13 of kexec arch/arm64/include/asm/assembler.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index ec4e37cb3b41..f3854d9b5e31 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -24,6 +24,7 @@ #define __ASM_ASSEMBLER_H #include +#include #include #include #include @@ -285,6 +286,24 @@ lr .req x30 // link register .endm /* + * copy_page - copy src to dest using temp registers t1-t8 + */ + .macro copy_page dest:req src:req t1:req t2:req t3:req t4:req t5:req t6:req t7:req t8:req +9998: ldp \t1, \t2, [\src] + ldp \t3, \t4, [\src, #16] + ldp \t5, \t6, [\src, #32] + ldp \t7, \t8, [\src, #48] + add \src, \src, #64 + stnp \t1, \t2, [\dest] + stnp \t3, \t4, [\dest, #16] + stnp \t5, \t6, [\dest, #32] + stnp \t7, \t8, [\dest, #48] + add \dest, \dest, #64 + tst \src, #(PAGE_SIZE - 1) + b.ne 9998b + .endm + +/* * Annotate a function as position independent, i.e., safe to be called before * the kernel virtual mapping is activated. */