v4.19.13 snapshot.
diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h
new file mode 100644
index 0000000..7b229af
--- /dev/null
+++ b/arch/x86/kernel/cpu/cpu.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef ARCH_X86_CPU_H
+#define ARCH_X86_CPU_H
+
+/* attempt to consolidate cpu attributes */
+struct cpu_dev {
+ const char *c_vendor;
+
+ /* some have two possibilities for cpuid string */
+ const char *c_ident[2];
+
+ void (*c_early_init)(struct cpuinfo_x86 *);
+ void (*c_bsp_init)(struct cpuinfo_x86 *);
+ void (*c_init)(struct cpuinfo_x86 *);
+ void (*c_identify)(struct cpuinfo_x86 *);
+ void (*c_detect_tlb)(struct cpuinfo_x86 *);
+ void (*c_bsp_resume)(struct cpuinfo_x86 *);
+ int c_x86_vendor;
+#ifdef CONFIG_X86_32
+ /* Optional vendor specific routine to obtain the cache size. */
+ unsigned int (*legacy_cache_size)(struct cpuinfo_x86 *,
+ unsigned int);
+
+ /* Family/stepping-based lookup table for model names. */
+ struct legacy_cpu_model_info {
+ int family;
+ const char *model_names[16];
+ } legacy_models[5];
+#endif
+};
+
+struct _tlb_table {
+ unsigned char descriptor;
+ char tlb_type;
+ unsigned int entries;
+ /* unsigned int ways; */
+ char info[128];
+};
+
+#define cpu_dev_register(cpu_devX) \
+ static const struct cpu_dev *const __cpu_dev_##cpu_devX __used \
+ __attribute__((__section__(".x86_cpu_dev.init"))) = \
+ &cpu_devX;
+
+extern const struct cpu_dev *const __x86_cpu_dev_start[],
+ *const __x86_cpu_dev_end[];
+
+extern void get_cpu_cap(struct cpuinfo_x86 *c);
+extern void get_cpu_address_sizes(struct cpuinfo_x86 *c);
+extern void cpu_detect_cache_sizes(struct cpuinfo_x86 *c);
+extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
+extern u32 get_scattered_cpuid_leaf(unsigned int level,
+ unsigned int sub_leaf,
+ enum cpuid_regs_idx reg);
+extern void init_intel_cacheinfo(struct cpuinfo_x86 *c);
+extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
+
+extern void detect_num_cpu_cores(struct cpuinfo_x86 *c);
+extern int detect_extended_topology_early(struct cpuinfo_x86 *c);
+extern int detect_extended_topology(struct cpuinfo_x86 *c);
+extern int detect_ht_early(struct cpuinfo_x86 *c);
+extern void detect_ht(struct cpuinfo_x86 *c);
+
+unsigned int aperfmperf_get_khz(int cpu);
+
+extern void x86_spec_ctrl_setup_ap(void);
+
+#endif /* ARCH_X86_CPU_H */