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Diffstat (limited to 'arch/arm64/include/asm/cpufeature.h')
-rw-r--r--arch/arm64/include/asm/cpufeature.h91
1 files changed, 83 insertions, 8 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index dbc78d2b8cc6..11d5bb0fdd54 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -10,6 +10,7 @@
#define __ASM_CPUFEATURE_H
#include <asm/hwcap.h>
+#include <asm/sysreg.h>
/*
* In the arm64 world (as in the ARM world), elf_hwcap is used both internally
@@ -35,11 +36,42 @@
#include <linux/kernel.h>
+/* CPU feature register tracking */
+enum ftr_type {
+ FTR_EXACT, /* Use a predefined safe value */
+ FTR_LOWER_SAFE, /* Smaller value is safe */
+ FTR_HIGHER_SAFE,/* Bigger value is safe */
+};
+
+#define FTR_STRICT true /* SANITY check strict matching required */
+#define FTR_NONSTRICT false /* SANITY check ignored */
+
+struct arm64_ftr_bits {
+ bool strict; /* CPU Sanity check: strict matching required ? */
+ enum ftr_type type;
+ u8 shift;
+ u8 width;
+ s64 safe_val; /* safe value for discrete features */
+};
+
+/*
+ * @arm64_ftr_reg - Feature register
+ * @strict_mask Bits which should match across all CPUs for sanity.
+ * @sys_val Safe value across the CPUs (system view)
+ */
+struct arm64_ftr_reg {
+ u32 sys_id;
+ const char *name;
+ u64 strict_mask;
+ u64 sys_val;
+ struct arm64_ftr_bits *ftr_bits;
+};
+
struct arm64_cpu_capabilities {
const char *desc;
u16 capability;
bool (*matches)(const struct arm64_cpu_capabilities *);
- void (*enable)(void);
+ void (*enable)(void *); /* Called on all active CPUs */
union {
struct { /* To be used for erratum handling only */
u32 midr_model;
@@ -47,8 +79,11 @@ struct arm64_cpu_capabilities {
};
struct { /* Feature register checking */
+ u32 sys_reg;
int field_pos;
int min_field_value;
+ int hwcap_type;
+ unsigned long hwcap;
};
};
};
@@ -76,19 +111,59 @@ static inline void cpus_set_cap(unsigned int num)
__set_bit(num, cpu_hwcaps);
}
-static inline int __attribute_const__ cpuid_feature_extract_field(u64 features,
- int field)
+static inline int __attribute_const__
+cpuid_feature_extract_field_width(u64 features, int field, int width)
+{
+ return (s64)(features << (64 - width - field)) >> (64 - width);
+}
+
+static inline int __attribute_const__
+cpuid_feature_extract_field(u64 features, int field)
+{
+ return cpuid_feature_extract_field_width(features, field, 4);
+}
+
+static inline u64 arm64_ftr_mask(struct arm64_ftr_bits *ftrp)
+{
+ return (u64)GENMASK(ftrp->shift + ftrp->width - 1, ftrp->shift);
+}
+
+static inline s64 arm64_ftr_value(struct arm64_ftr_bits *ftrp, u64 val)
+{
+ return cpuid_feature_extract_field_width(val, ftrp->shift, ftrp->width);
+}
+
+static inline bool id_aa64mmfr0_mixed_endian_el0(u64 mmfr0)
{
- return (s64)(features << (64 - 4 - field)) >> (64 - 4);
+ return cpuid_feature_extract_field(mmfr0, ID_AA64MMFR0_BIGENDEL_SHIFT) == 0x1 ||
+ cpuid_feature_extract_field(mmfr0, ID_AA64MMFR0_BIGENDEL0_SHIFT) == 0x1;
}
+void __init setup_cpu_features(void);
-void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
+void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
const char *info);
void check_local_cpu_errata(void);
-void check_local_cpu_features(void);
-bool cpu_supports_mixed_endian_el0(void);
-bool system_supports_mixed_endian_el0(void);
+
+#ifdef CONFIG_HOTPLUG_CPU
+void verify_local_cpu_capabilities(void);
+#else
+static inline void verify_local_cpu_capabilities(void)
+{
+}
+#endif
+
+u64 read_system_reg(u32 id);
+
+static inline bool cpu_supports_mixed_endian_el0(void)
+{
+ return id_aa64mmfr0_mixed_endian_el0(read_cpuid(ID_AA64MMFR0_EL1));
+}
+
+static inline bool system_supports_mixed_endian_el0(void)
+{
+ return id_aa64mmfr0_mixed_endian_el0(read_system_reg(SYS_ID_AA64MMFR0_EL1));
+}
#endif /* __ASSEMBLY__ */