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Commit f7806105 authored by Suzuki K Poulose's avatar Suzuki K Poulose Committed by Isaac J. Manjarres
Browse files

arm64: Add helpers for checking CPU MIDR against a range 



Add helpers for checking if the given CPU midr falls in a range
of variants/revisions for a given model.

Change-Id: Ifde0f33ededa0be56d63ed4efad21fbf5a99e6fc
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: default avatarDave Martin <dave.martin@arm.com>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Git-commit: 1df31050
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[isaacm@codeaurora.org: remove code that is not needed for
 having a way of expressing a list of CPUs that would
 be impacted by erratum 1024718.]
Signed-off-by: default avatarIsaac J. Manjarres <isaacm@codeaurora.org>
parent aa46e038

arch/arm64/include/asm/cputype.h

+30 −0
Original line number Diff line number Diff line
@@ -119,6 +119,36 @@ 


#define read_cpuid(reg)			read_sysreg_s(SYS_ ## reg)



/*

 * Represent a range of MIDR values for a given CPU model and a

 * range of variant/revision values.

 *

 * @model	- CPU model as defined by MIDR_CPU_MODEL

 * @rv_min	- Minimum value for the revision/variant as defined by

 *		  MIDR_CPU_VAR_REV

 * @rv_max	- Maximum value for the variant/revision for the range.

 */

struct midr_range {

	u32 model;

	u32 rv_min;

	u32 rv_max;

};



#define GENERIC_MIDR_RANGE(m, v_min, r_min, v_max, r_max)	\

	{							\

		.model = m,					\

		.rv_min = MIDR_CPU_VAR_REV(v_min, r_min),	\

		.rv_max = MIDR_CPU_VAR_REV(v_max, r_max),	\

	}



#define GENERIC_MIDR_ALL_VERSIONS(m) GENERIC_MIDR_RANGE(m, 0, 0, 0xf, 0xf)



static inline bool is_midr_in_range(u32 midr, struct midr_range const *range)

{

	return MIDR_IS_CPU_MODEL_RANGE(midr, range->model,

				 range->rv_min, range->rv_max);

}



/*

 * 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