linux-kernel - [PATCH v15 08/16] arm64: cpufeature: add MMFR0 helper functions

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Message-Id: <20180928064841.14117-9-takahiro.akashi@linaro.org>
Date:   Fri, 28 Sep 2018 15:48:33 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     catalin.marinas@....com, will.deacon@....com, dhowells@...hat.com,
        vgoyal@...hat.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, dyoung@...hat.com, bhe@...hat.com,
        arnd@...db.de, schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Cc:     prudo@...ux.ibm.com, ard.biesheuvel@...aro.org,
        james.morse@....com, bhsharma@...hat.com,
        kexec@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [PATCH v15 08/16] arm64: cpufeature: add MMFR0 helper functions

Those helper functions for MMFR0 register will be used later by kexec_file
loader.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Reviewed-by: James Morse <james.morse@....com>
---
 arch/arm64/include/asm/cpufeature.h | 48 +++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 1717ba1db35d..cd90b5252d6d 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -486,11 +486,59 @@ static inline bool system_supports_32bit_el0(void)
 	return cpus_have_const_cap(ARM64_HAS_32BIT_EL0);
 }
 
+static inline bool system_supports_4kb_granule(void)
+{
+	u64 mmfr0;
+	u32 val;
+
+	mmfr0 =	read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	val = cpuid_feature_extract_unsigned_field(mmfr0,
+						ID_AA64MMFR0_TGRAN4_SHIFT);
+
+	return val == ID_AA64MMFR0_TGRAN4_SUPPORTED;
+}
+
+static inline bool system_supports_64kb_granule(void)
+{
+	u64 mmfr0;
+	u32 val;
+
+	mmfr0 =	read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	val = cpuid_feature_extract_unsigned_field(mmfr0,
+						ID_AA64MMFR0_TGRAN64_SHIFT);
+
+	return val == ID_AA64MMFR0_TGRAN64_SUPPORTED;
+}
+
+static inline bool system_supports_16kb_granule(void)
+{
+	u64 mmfr0;
+	u32 val;
+
+	mmfr0 =	read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	val = cpuid_feature_extract_unsigned_field(mmfr0,
+						ID_AA64MMFR0_TGRAN16_SHIFT);
+
+	return val == ID_AA64MMFR0_TGRAN16_SUPPORTED;
+}
+
 static inline bool system_supports_mixed_endian_el0(void)
 {
 	return id_aa64mmfr0_mixed_endian_el0(read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1));
 }
 
+static inline bool system_supports_mixed_endian(void)
+{
+	u64 mmfr0;
+	u32 val;
+
+	mmfr0 =	read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	val = cpuid_feature_extract_unsigned_field(mmfr0,
+						ID_AA64MMFR0_BIGENDEL_SHIFT);
+
+	return val == 0x1;
+}
+
 static inline bool system_supports_fpsimd(void)
 {
 	return !cpus_have_const_cap(ARM64_HAS_NO_FPSIMD);
-- 
2.19.0