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@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 7e2ec64..ef118d8 100644 (file)
--- 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);