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Commit b058450f authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi
Browse files

arm64: kernel: add MPIDR_EL1 accessors macros 



In order to simplify access to different affinity levels within the
MPIDR_EL1 register values, this patch implements some preprocessor
macros that allow to retrieve the MPIDR_EL1 affinity level value according
to the level passed as input parameter.

Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
parent 319e2e3f

arch/arm64/include/asm/cputype.h

+10 −0
Original line number Diff line number Diff line
@@ -30,6 +30,16 @@ 


#define MPIDR_HWID_BITMASK	0xff00ffffff



#define MPIDR_LEVEL_BITS_SHIFT	3

#define MPIDR_LEVEL_BITS	(1 << MPIDR_LEVEL_BITS_SHIFT)

#define MPIDR_LEVEL_MASK	((1 << MPIDR_LEVEL_BITS) - 1)



#define MPIDR_LEVEL_SHIFT(level) \

	(((1 << level) >> 1) << MPIDR_LEVEL_BITS_SHIFT)



#define MPIDR_AFFINITY_LEVEL(mpidr, level) \

	((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK)



#define read_cpuid(reg) ({						\

	u64 __val;							\

	asm("mrs	%0, " reg : "=r" (__val));			\