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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>
This commit is contained in:
Marc Zyngier 2013-02-27 18:05:59 +00:00 committed by Catalin Marinas
parent 792072066d
commit d9c1951f40
1 changed files with 22 additions and 0 deletions
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22
arch/arm64/include/asm/cputype.h
View File

@ -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);