arch/x86/include/asm/cpu.h

   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
  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 #ifdef CONFIG_CPU_SUP_INTEL
  44 extern void __init cpu_set_core_cap_bits(struct cpuinfo_x86 *c);
  45 extern void switch_to_sld(unsigned long tifn);
  46 extern bool handle_user_split_lock(struct pt_regs *regs, long error_code);
  47 extern bool handle_guest_split_lock(unsigned long ip);
  48 #else
  49 static inline void __init cpu_set_core_cap_bits(struct cpuinfo_x86 *c) {}
  50 static inline void switch_to_sld(unsigned long tifn) {}
  51 static inline bool handle_user_split_lock(struct pt_regs *regs, long error_code)
  52 {
  53         return false;
  54 }
  55
  56 static inline bool handle_guest_split_lock(unsigned long ip)
  57 {
  58         return false;
  59 }
  60 #endif
  61 #ifdef CONFIG_IA32_FEAT_CTL
  62 void init_ia32_feat_ctl(struct cpuinfo_x86 *c);
  63 #else
  64 static inline void init_ia32_feat_ctl(struct cpuinfo_x86 *c) {}
  65 #endif
  66 #endif /* _ASM_X86_CPU_H */