From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B9460C432C0 for ; Tue, 19 Nov 2019 12:34:15 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8B431222A4 for ; Tue, 19 Nov 2019 12:34:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="O6iKv/DB" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8B431222A4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=KopPXcDNsJU35NZRFB0Qw76zF8/QT2HmNO3r1J/p+dQ=; b=O6iKv/DBsdOxOn4f1cgYvAdjuY U5s/NsASxT4tzd227E4slqHFTKSUPoL7HC8V+q/0TGCbWGlO3dQXnifBqkNrEeTsOWb0P7KBBJ480 KACECkFwLhkegC1NP/csc8kvgUK5Rc8tFXGyXA+z/EFf19s+j0UKtA+6zFCOOCeUMNo7iJOWY9o4k XFUOtzd1OXFHmbZy1rSHFFQ+HhCrYhK1M9KAZOohj6zFU4a0AzJ2gv1OrjUlFsnVsQf6XkKbHqHLP +s8AGE6wI8kNFOdZ1tgrvZIY0TcM+QWJWUzsxMXAXITUREGj3FCOHjkDxQEkuwE9r2Ab4NvkL7PRb dV2Zhv+A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iX2hy-0007n6-GI; Tue, 19 Nov 2019 12:34:14 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iX2gy-0006vz-AE for linux-arm-kernel@lists.infradead.org; Tue, 19 Nov 2019 12:33:14 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C9F2D1FB; Tue, 19 Nov 2019 04:33:10 -0800 (PST) Received: from a075553-lin.blr.arm.com (a075553-lin.blr.arm.com [10.162.0.144]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 5A3AB3F703; Tue, 19 Nov 2019 04:33:07 -0800 (PST) From: Amit Daniel Kachhap To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 03/14] arm64: create macro to park cpu in an infinite loop Date: Tue, 19 Nov 2019 18:02:15 +0530 Message-Id: <1574166746-27197-4-git-send-email-amit.kachhap@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1574166746-27197-1-git-send-email-amit.kachhap@arm.com> References: <1574166746-27197-1-git-send-email-amit.kachhap@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191119_043312_588802_C770636E X-CRM114-Status: GOOD ( 10.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Kees Cook , Suzuki K Poulose , Catalin Marinas , Ard Biesheuvel , Will Deacon , Kristina Martsenko , James Morse , Ramana Radhakrishnan , Amit Daniel Kachhap , Vincenzo Frascino , Dave Martin MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org A macro early_park_cpu is added to park the faulted cpu in an infinite loop. Currently, this macro is substituted in two instances and is reused in the subsequent pointer authentication patch. Signed-off-by: Amit Daniel Kachhap --- Changes since last: * Added macro update_early_cpu_boot_status inside early_park_cpu. arch/arm64/kernel/head.S | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 989b194..3d18163 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -761,6 +761,17 @@ ENDPROC(__secondary_too_slow) .endm /* + * Macro to park the cpu in an infinite loop. + */ + .macro early_park_cpu status + update_early_cpu_boot_status \status | CPU_STUCK_IN_KERNEL, x1, x2 +.Lepc_\@: + wfe + wfi + b .Lepc_\@ + .endm + +/* * Enable the MMU. * * x0 = SCTLR_EL1 value for turning on the MMU. @@ -808,24 +819,14 @@ ENTRY(__cpu_secondary_check52bitva) and x0, x0, #(0xf << ID_AA64MMFR2_LVA_SHIFT) cbnz x0, 2f - update_early_cpu_boot_status \ - CPU_STUCK_IN_KERNEL | CPU_STUCK_REASON_52_BIT_VA, x0, x1 -1: wfe - wfi - b 1b - + early_park_cpu CPU_STUCK_REASON_52_BIT_VA #endif 2: ret ENDPROC(__cpu_secondary_check52bitva) __no_granule_support: /* Indicate that this CPU can't boot and is stuck in the kernel */ - update_early_cpu_boot_status \ - CPU_STUCK_IN_KERNEL | CPU_STUCK_REASON_NO_GRAN, x1, x2 -1: - wfe - wfi - b 1b + early_park_cpu CPU_STUCK_REASON_NO_GRAN ENDPROC(__no_granule_support) #ifdef CONFIG_RELOCATABLE -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel