[PATCH 4/6] arm: arm64: Add routine to determine cpuid of other cpus

From: Jeremy Linton
Date: Tue Apr 12 2016 - 16:22:28 EST


It is helpful if we can read the cpuid/midr of other CPUs
in the system independent of arm/arm64.

Signed-off-by: Jeremy Linton <jeremy.linton@xxxxxxx>
---
arch/arm/include/asm/cputype.h | 4 ++++
arch/arm64/include/asm/cputype.h | 3 +++
2 files changed, 7 insertions(+)

diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h
index b23c6c8..274baf4 100644
--- a/arch/arm/include/asm/cputype.h
+++ b/arch/arm/include/asm/cputype.h
@@ -208,6 +208,10 @@ static inline unsigned int __attribute_const__ read_cpuid_mpidr(void)
return read_cpuid(CPUID_MPIDR);
}

+#define read_specific_cpuid(cpu_num) per_cpu_ptr(&cpu_data, cpu_num)->cpuid
+
+
+
/*
* Intel's XScale3 core supports some v6 features (supersections, L2)
* but advertises itself as v5 as it does not support the v6 ISA. For
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index 87e1985..76423a7 100644
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -126,6 +126,9 @@ static inline u32 __attribute_const__ read_cpuid_cachetype(void)
{
return read_cpuid(CTR_EL0);
}
+
+#define read_specific_cpuid(cpu_num) per_cpu_ptr(&cpu_data, cpu_num)->reg_midr
+
#endif /* __ASSEMBLY__ */

#endif
--
2.4.3