Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d9c1951f authored by Marc Zyngier's avatar Marc Zyngier Committed by Catalin Marinas
Browse files

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: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 79207206

arch/arm64/include/asm/cputype.h

+22 −0
Original line number Diff line number Diff line
@@ -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);