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Wed, 1 Dec 2021 12:06:13 +0000 From: Joey Gouly To: CC: , , , , , , , , , Subject: [PATCH v1 0/3] arm64: Add two HWCAPs for Arm v8.7 FP behaviour Date: Wed, 1 Dec 2021 12:05:55 +0000 Message-ID: <20211201120558.9140-1-joey.gouly@arm.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 73e511a6-f88c-49ef-bb71-08d9b4c303b0 X-MS-TrafficTypeDiagnostic: VE1PR08MB5136:|VI1PR08MB3886: X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:5516;OLM:5516; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:40.67.248.234; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series adds new HWCAPs for two Arm v8.7 features: - FEAT_AFP: Alternate floating-point behavior for specific floating point instructions. - FEAT_RPRES: Increased precision of Reciprocal Estimate and Reciprocal Square Root Estimate from an 8-bit mantissa to a 12-bit mantissa. These features can be enabled by userspace by setting some new bits in FPCR. These new bits are FPCR.{NEP, AH, FIZ}. Since these must be explicitly enabled by userspace, this should not affect existing applications. This has been tested with: - FVP: combinations of both features, including mismatched CPUs - qemu: regression test, neither feature is supported - juno: regression test, neither feature is supported Joey Gouly (3): arm64: cpufeature: add HWCAP for FEAT_AFP arm64: add ID_AA64ISAR2_EL1 sys register arm64: cpufeature: add HWCAP for FEAT_RPRES Documentation/arm64/cpu-feature-registers.rst | 17 +++++++++++++++++ Documentation/arm64/elf_hwcaps.rst | 8 ++++++++ arch/arm64/include/asm/cpu.h | 1 + arch/arm64/include/asm/hwcap.h | 2 ++ arch/arm64/include/asm/sysreg.h | 11 +++++++++++ arch/arm64/include/uapi/asm/hwcap.h | 2 ++ arch/arm64/kernel/cpufeature.c | 13 +++++++++++++ arch/arm64/kernel/cpuinfo.c | 3 +++ arch/arm64/kvm/sys_regs.c | 2 +- 9 files changed, 58 insertions(+), 1 deletion(-) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel