From patchwork Mon Dec 7 10:53:17 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 57763 Delivered-To: patch@linaro.org Received: by 10.112.147.194 with SMTP id tm2csp1072066lbb; Mon, 7 Dec 2015 02:56:55 -0800 (PST) X-Received: by 10.66.243.3 with SMTP id wu3mr42436162pac.135.1449485815798; Mon, 07 Dec 2015 02:56:55 -0800 (PST) Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org. [2001:1868:205::9]) by mx.google.com with ESMTPS id l63si714890pfb.126.2015.12.07.02.56.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Dec 2015 02:56:55 -0800 (PST) Received-SPF: pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) client-ip=2001:1868:205::9; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a5tQs-00006x-Ng; Mon, 07 Dec 2015 10:54:14 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a5tQp-0008Uh-Dg for linux-arm-kernel@lists.infradead.org; Mon, 07 Dec 2015 10:54:12 +0000 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 B72C43A8; Mon, 7 Dec 2015 02:53:29 -0800 (PST) Received: from approximate.cambridge.arm.com (approximate.cambridge.arm.com [10.1.209.24]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 81CF43F529; Mon, 7 Dec 2015 02:53:49 -0800 (PST) From: Marc Zyngier To: Christoffer Dall Subject: [PATCH v3 01/22] arm64: Add macros to read/write system registers Date: Mon, 7 Dec 2015 10:53:17 +0000 Message-Id: <1449485618-9443-2-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1449485618-9443-1-git-send-email-marc.zyngier@arm.com> References: <1449485618-9443-1-git-send-email-marc.zyngier@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151207_025411_478264_7BEA1CD9 X-CRM114-Status: UNSURE ( 8.15 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -6.9 (------) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-6.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [217.140.101.70 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Steve Capper , kvm@vger.kernel.org, Ard Biesheuvel , Catalin Marinas , =?UTF-8?q?Alex=20Benn=C3=A9e?= , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org From: Mark Rutland Rather than crafting custom macros for reading/writing each system register provide generics accessors, read_sysreg and write_sysreg, for this purpose. Unlike read_cpuid, calls to read_exception_reg are never expected to be optimized away or replaced with synthetic values. Signed-off-by: Mark Rutland Cc: Catalin Marinas Cc: Marc Zyngier Cc: Suzuki Poulose Cc: Will Deacon Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/sysreg.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) -- 2.1.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel Acked-by: Catalin Marinas diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index d48ab5b..c9c283a 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -20,6 +20,8 @@ #ifndef __ASM_SYSREG_H #define __ASM_SYSREG_H +#include + #include /* @@ -208,6 +210,8 @@ #else +#include + asm( " .irp num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n" " .equ __reg_num_x\\num, \\num\n" @@ -232,6 +236,19 @@ static inline void config_sctlr_el1(u32 clear, u32 set) val |= set; asm volatile("msr sctlr_el1, %0" : : "r" (val)); } + +#define read_sysreg(r) ({ \ + u64 __val; \ + asm volatile("mrs %0, " __stringify(r) : "=r" (__val)); \ + __val; \ +}) + +#define write_sysreg(v, r) do { \ + u64 __val = (u64)v; \ + asm volatile("msr " __stringify(r) ", %0" \ + : : "r" (__val)); \ +} while (0) + #endif #endif /* __ASM_SYSREG_H */