D52187.diff
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	diff --git a/sys/arm64/include/cpu.h b/sys/arm64/include/cpu.h
	--- a/sys/arm64/include/cpu.h
	+++ b/sys/arm64/include/cpu.h
	@@ -196,6 +196,31 @@
	#define CPU_MATCH_RAW(mask, devid) \
	(((mask) & PCPU_GET(midr)) == ((mask) & (devid)))

	+#if !defined(__ASSEMBLER__)
	+static inline bool
	+midr_check_var_part_range(u_int midr, u_int impl, u_int part, u_int var_low,
	+ u_int part_low, u_int var_high, u_int part_high)
	+{
	+ /* Check for the correct part */
	+ if (CPU_IMPL(midr) != impl \|\| CPU_PART(midr) != part)
	+ return (false);
	+
	+ /* Check if the variant is between var_low and var_high inclusive */
	+ if (CPU_VAR(midr) < var_low \|\| CPU_VAR(midr) > var_high)
	+ return (false);
	+
	+ /* If the variant is the low value, check if the part is high enough */
	+ if (CPU_VAR(midr) == var_low && CPU_PART(midr) < part_low)
	+ return (false);
	+
	+ /* If the variant is the high value, check if the part is low enough */
	+ if (CPU_VAR(midr) == var_high && CPU_PART(midr) > part_high)
	+ return (false);
	+
	+ return (true);
	+}
	+#endif
	+
	/*
	* Chip-specific errata. This defines are intended to be
	* booleans used within if statements. When an appropriate