arm64/kernel/cpufeature.c

43  * - A "feature" is typically a 4-bit register field. A "capability" is the
44  *   high-level description derived from the sanitised field value.
57  * - If the arm64_ftr_bits[] for a register has a missing field, then this
58  *   field is treated as STRICT RES0, including for read_sanitised_ftr_reg().
143 #define __ARM64_MAX_POSITIVE(reg, field)				\
144 		((reg##_##field##_SIGNED ?				\
145 		  BIT(reg##_##field##_WIDTH - 1) :			\
146 		  BIT(reg##_##field##_WIDTH)) - 1)
148 #define __ARM64_MIN_NEGATIVE(reg, field)  BIT(reg##_##field##_WIDTH - 1)
150 #define __ARM64_CPUID_FIELDS(reg, field, min_value, max_value)		\
152 		.field_pos = reg##_##field##_SHIFT,			\
153 		.field_width = reg##_##field##_WIDTH,			\
154 		.sign = reg##_##field##_SIGNED,				\
159  * ARM64_CPUID_FIELDS() encodes a field with a range from min_value to
160  * an implicit maximum that depends on the sign-ess of the field.
162  * An unsigned field will be capped at all ones, while a signed field
165 #define ARM64_CPUID_FIELDS(reg, field, min_value)			\
166 	__ARM64_CPUID_FIELDS(reg, field,				\
167 			     SYS_FIELD_VALUE(reg, field, min_value),	\
168 			     __ARM64_MAX_POSITIVE(reg, field))
171  * ARM64_CPUID_FIELDS_NEG() encodes a field with a range from an
175 #define ARM64_CPUID_FIELDS_NEG(reg, field, max_value)			\
176 	__ARM64_CPUID_FIELDS(reg, field,				\
177 			     __ARM64_MIN_NEGATIVE(reg, field),		\
178 			     SYS_FIELD_VALUE(reg, field, max_value))
1199 static void relax_cpu_ftr_reg(u32 sys_id, int field)
1208 		if (ftrp->shift == field) {
1214 	/* Bogus field? */
1273 	 * Regardless of the value of the AuxReg field, the AIFSR, ADFSR, and
1421 	 * they read/write depends on the GMID_EL1.BS field. Check that the
2867 #define HWCAP_CPUID_MATCH(reg, field, min_value)			\
2869 		ARM64_CPUID_FIELDS(reg, field, min_value)
2877 #define HWCAP_CAP(reg, field, min_value, cap_type, cap)		\
2880 		HWCAP_CPUID_MATCH(reg, field, min_value) 		\