From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760435AbcBYJxJ (ORCPT ); Thu, 25 Feb 2016 04:53:09 -0500 Received: from foss.arm.com ([217.140.101.70]:50251 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760321AbcBYJxF (ORCPT ); Thu, 25 Feb 2016 04:53:05 -0500 From: Suzuki K Poulose To: linux-arm-kernel@lists.infradead.org Cc: marc.zyngier@arm.com, christoffer.dall@linaro.org, will.deacon@arm.com, ynorov@caviumnetworks.com, catalin.marinas@arm.com, mark.rutland@arm.com, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Suzuki K Poulose Subject: [PATCH v2 3/8] arm64: Add helpers for detecting AArch32 support at EL0 Date: Thu, 25 Feb 2016 09:52:43 +0000 Message-Id: <1456393968-17386-4-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1456393968-17386-1-git-send-email-suzuki.poulose@arm.com> References: <1456393968-17386-1-git-send-email-suzuki.poulose@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adds a helper to extract the support for AArch32 at EL0 Signed-off-by: Suzuki K Poulose --- arch/arm64/include/asm/cpufeature.h | 7 +++++++ arch/arm64/include/asm/sysreg.h | 1 + 2 files changed, 8 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 5444a77..98f83d7 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -165,6 +165,13 @@ static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0) cpuid_feature_extract_unsigned_field(mmfr0, ID_AA64MMFR0_BIGENDEL0_SHIFT) == 0x1; } +static inline bool id_aa64pfr0_32bit_el0(u64 pfr0) +{ + u32 val = cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_EL0_SHIFT); + + return val == ID_AA64PFR0_EL0_32BIT_64BIT; +} + void __init setup_cpu_features(void); void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps, diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 4aeebec..76d2f3e 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -111,6 +111,7 @@ #define ID_AA64PFR0_ASIMD_SUPPORTED 0x0 #define ID_AA64PFR0_EL1_64BIT_ONLY 0x1 #define ID_AA64PFR0_EL0_64BIT_ONLY 0x1 +#define ID_AA64PFR0_EL0_32BIT_64BIT 0x2 /* id_aa64mmfr0 */ #define ID_AA64MMFR0_TGRAN4_SHIFT 28 -- 1.7.9.5