From: Suzuki K Poulose <suzuki.poulose@arm.com>
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 <suzuki.poulose@arm.com>
Subject: [PATCH v2 3/8] arm64: Add helpers for detecting AArch32 support at EL0
Date: Thu, 25 Feb 2016 09:52:43 +0000 [thread overview]
Message-ID: <1456393968-17386-4-git-send-email-suzuki.poulose@arm.com> (raw)
In-Reply-To: <1456393968-17386-1-git-send-email-suzuki.poulose@arm.com>
Adds a helper to extract the support for AArch32 at EL0
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
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
next prev parent reply other threads:[~2016-02-25 9:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-25 9:52 [PATCH v2 0/8] arm64: Support for systems without AArch32 state Suzuki K Poulose
2016-02-25 9:52 ` [PATCH v2 1/8] arm64: hwcaps: Cleanup naming Suzuki K Poulose
2016-02-25 9:52 ` [PATCH v2 2/8] arm64: HWCAP: Split COMPAT HWCAP table entries Suzuki K Poulose
2016-02-25 9:52 ` Suzuki K Poulose [this message]
2016-02-25 9:52 ` [PATCH v2 4/8] arm64: cpufeature: Check availability of AArch32 Suzuki K Poulose
2016-02-25 9:52 ` [PATCH v2 5/8] arm64: cpufeature: Track 32bit EL0 support Suzuki K Poulose
2016-02-25 9:52 ` [PATCH v2 6/8] arm64: Add a wrapper for personality() syscall Suzuki K Poulose
2016-02-25 9:52 ` [PATCH v2 7/8] arm64: compat: Check for AArch32 state Suzuki K Poulose
2016-02-25 9:52 ` [PATCH v2 8/8] arm64: kvm: Check support for AArch32 for 32bit guests Suzuki K Poulose
2016-03-02 9:08 ` Marc Zyngier
2016-03-02 10:22 ` Suzuki K. Poulose
2016-03-14 12:27 ` Suzuki K. Poulose
2016-03-01 21:19 ` [PATCH v2 0/8] arm64: Support for systems without AArch32 state Yury Norov
2016-03-02 15:07 ` Yury Norov
2016-03-02 15:24 ` Mark Rutland
2016-03-02 15:25 ` Suzuki K. Poulose
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