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Groups > linux.kernel > #1226154

[PATCH 09/22] arm64: Read system wide CPUID value

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From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>

Add an API for reading the safe CPUID value across the
system from the new infrastructure.

Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
---
 arch/arm64/include/asm/cpufeature.h |    2 ++
 arch/arm64/kernel/cpufeature.c      |    9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 7927ac2..f59e90a 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -149,6 +149,8 @@ void check_local_cpu_features(void);
 bool cpu_supports_mixed_endian_el0(void);
 bool system_supports_mixed_endian_el0(void);
 
+u64 read_system_reg(u32 id);
+
 #endif /* __ASSEMBLY__ */
 
 #endif
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 960a62f..a736c13 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -593,6 +593,15 @@ void update_cpu_features(int cpu,
 	update_mixed_endian_el0_support(info);
 }
 
+u64 read_system_reg(u32 id)
+{
+	struct arm64_ftr_reg *regp = get_arm64_sys_reg(id);
+
+	/* We shouldn't get a request for an unsupported register */
+	BUG_ON(!regp);
+	return regp->sys_val;
+}
+
 static bool
 feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry)
 {
-- 
1.7.9.5

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[PATCH 00/22] arm64: Consolidate CPU feature handling "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 06/22] arm64: sys_reg: Define System register encoding "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 03/22] arm64: Move cpu feature detection code "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 02/22] arm64: Delay ELF HWCAP initialisation until all CPUs are up "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 09/22] arm64: Read system wide CPUID value "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 13/22] arm64: Make use of system wide capability checks "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 04/22] arm64: Move mixed endian support detection "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 15/22] arm64: Move FP/ASIMD hwcap handling to common code "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 08/22] arm64: Consolidate CPU Sanity check to CPU Feature infrastructure "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  [PATCH 22/22] arm64: feature registers: Documentation "Suzuki K. Poulose" <suzuki.poulose@arm.com> - 2015-09-16 16:30 +0200
  Re: [PATCH 00/22] arm64: Consolidate CPU feature handling "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2015-09-18 11:30 +0200

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