1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_CPU_H
3 #define _ASM_X86_CPU_H
4 
5 #include <linux/device.h>
6 #include <linux/cpu.h>
7 #include <linux/topology.h>
8 #include <linux/nodemask.h>
9 #include <linux/percpu.h>
10 
11 #ifdef CONFIG_SMP
12 
13 extern void prefill_possible_map(void);
14 
15 #else /* CONFIG_SMP */
16 
prefill_possible_map(void)17 static inline void prefill_possible_map(void) {}
18 
19 #define cpu_physical_id(cpu)			boot_cpu_physical_apicid
20 #define cpu_acpi_id(cpu)			0
21 #define safe_smp_processor_id()			0
22 
23 #endif /* CONFIG_SMP */
24 
25 struct x86_cpu {
26 	struct cpu cpu;
27 };
28 
29 #ifdef CONFIG_HOTPLUG_CPU
30 extern int arch_register_cpu(int num);
31 extern void arch_unregister_cpu(int);
32 extern void start_cpu0(void);
33 #ifdef CONFIG_DEBUG_HOTPLUG_CPU0
34 extern int _debug_hotplug_cpu(int cpu, int action);
35 #endif
36 #endif
37 
38 int mwait_usable(const struct cpuinfo_x86 *);
39 
40 unsigned int x86_family(unsigned int sig);
41 unsigned int x86_model(unsigned int sig);
42 unsigned int x86_stepping(unsigned int sig);
43 #endif /* _ASM_X86_CPU_H */
44