linux-kernel - [PATCH 04/11] arm64: cpufeature: add FEAT

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Message-Id: <20250804121724.3681531-5-yeoreum.yun@arm.com>
Date: Mon,  4 Aug 2025 13:17:17 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
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Cc: linux-arm-kernel@...ts.infradead.org,
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	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH 04/11] arm64: cpufeature: add FEAT_SCTLR2 feature

Since Armv8.8 architecture FEAT_SCTLR2 is supported to provide
extensions of top-level control system
(i.e) FEAT_PAuth_LR, FEAT_CPA/CPA2, FEAT_MEC and etc.

To use related system extensions in the future, add SCTLR2 feature.

Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
---
 arch/arm64/kernel/cpufeature.c | 8 ++++++++
 arch/arm64/tools/cpucaps       | 1 +
 2 files changed, 9 insertions(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index e151585c6cca..4aa83221a4a6 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -500,6 +500,7 @@ static const struct arm64_ftr_bits ftr_id_aa64mmfr3[] = {
 	ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_POE),
 		       FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_S1POE_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_S1PIE_SHIFT, 4, 0),
+	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_SCTLRX_SHIFT, 4, 0),
 	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_TCRX_SHIFT, 4, 0),
 	ARM64_FTR_END,
 };
@@ -3061,6 +3062,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 		.matches = has_pmuv3,
 	},
 #endif
+	{
+		.desc = "Secondary System Control Register (SCTLR2)",
+		.capability = ARM64_HAS_SCTLR2,
+		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+		.matches = has_cpuid_feature,
+		ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, SCTLRX, IMP)
+	},
 	{},
 };

diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 10effd4cff6b..a0184295c5d9 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -52,6 +52,7 @@ HAS_S1POE
 HAS_RAS_EXTN
 HAS_RNG
 HAS_SB
+HAS_SCTLR2
 HAS_STAGE2_FWB
 HAS_TCR2
 HAS_TIDCP1
--
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}