arm64: add read_cpuid_{implementor,part_number,mpidr}

In order to preserve some kind of source compatibility between
arm and arm64, introduce read_cpuid_{implementor,part_number,mpidr}
which are used on KVM to find out which CPU we're running on.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index ef54125e6c1e..7a317029e735 100644
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -17,6 +17,7 @@
 #define __ASM_CPUTYPE_H
 
 #define ID_MIDR_EL1             "midr_el1"
+#define ID_MPIDR_EL1            "mpidr_el1"
 #define ID_CTR_EL0              "ctr_el0"
 
 #define ID_AA64PFR0_EL1         "id_aa64pfr0_el1"
@@ -31,6 +32,12 @@
         __val;                                                          \
 })
 
+#define ARM_CPU_IMP_ARM         0x41
+
+#define ARM_CPU_PART_AEM_V8     0xD0F0
+#define ARM_CPU_PART_FOUNDATION 0xD000
+#define ARM_CPU_PART_CORTEX_A57 0xD070
+
 /*
  * The CPU ID never changes at run time, so we might as well tell the
  * compiler that it's constant.  Use this function to read the CPU ID
@@ -41,6 +48,21 @@ static inline u32 __attribute_const__ read_cpuid_id(void)
         return read_cpuid(ID_MIDR_EL1);
 }
 
+static inline u64 __attribute_const__ read_cpuid_mpidr(void)
+{
+        return read_cpuid(ID_MPIDR_EL1);
+}
+
+static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
+{
+        return (read_cpuid_id() & 0xFF000000) >> 24;
+}
+
+static inline unsigned int __attribute_const__ read_cpuid_part_number(void)
+{
+        return (read_cpuid_id() & 0xFFF0);
+}
+
 static inline u32 __attribute_const__ read_cpuid_cachetype(void)
 {
         return read_cpuid(ID_CTR_EL0);