From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier 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> References: <1449485618-9443-1-git-send-email-marc.zyngier@arm.com> Cc: Mark Rutland , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Steve Capper , Ard Biesheuvel , Catalin Marinas , linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu To: Christoffer Dall Return-path: Received: from foss.arm.com ([217.140.101.70]:35753 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754595AbbLGKxv (ORCPT ); Mon, 7 Dec 2015 05:53:51 -0500 In-Reply-To: <1449485618-9443-1-git-send-email-marc.zyngier@arm.com> Sender: kvm-owner@vger.kernel.org List-ID: 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(+) 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 */ -- 2.1.4