1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * arch/arm/include/asm/smp.h
5 * Copyright (C) 2004-2005 ARM Ltd.
7 #ifndef __ASM_ARM_SMP_H
8 #define __ASM_ARM_SMP_H
10 #include <linux/threads.h>
11 #include <linux/cpumask.h>
12 #include <linux/thread_info.h>
15 # error "<asm/smp.h> included in non-SMP build"
18 #define raw_smp_processor_id() (current_thread_info()->cpu)
23 * generate IPI list text
25 extern void show_ipi_list(struct seq_file *, int);
28 * Called from C code, this handles an IPI.
30 void handle_IPI(int ipinr, struct pt_regs *regs);
33 * Setup the set of possible CPUs (via set_cpu_possible)
35 extern void smp_init_cpus(void);
38 * Register IPI interrupts with the arch SMP code
40 extern void set_smp_ipi_range(int ipi_base, int nr_ipi);
43 * Called from platform specific assembly code, this is the
44 * secondary CPU entry point.
46 asmlinkage void secondary_start_kernel(struct task_struct *task);
50 * Initial data for bringing up a secondary CPU.
52 struct secondary_data {
54 struct mpu_rgn_info *mpu_rgn_info;
57 unsigned long swapper_pg_dir;
59 struct task_struct *task;
61 extern struct secondary_data secondary_data;
62 extern void secondary_startup(void);
63 extern void secondary_startup_arm(void);
65 extern int __cpu_disable(void);
67 static inline void __cpu_die(unsigned int cpu) { }
69 extern void arch_send_call_function_single_ipi(int cpu);
70 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
71 extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
73 extern int register_ipi_completion(struct completion *completion, int cpu);
75 struct smp_operations {
78 * Setup the set of possible CPUs (via set_cpu_possible)
80 void (*smp_init_cpus)(void);
82 * Initialize cpu_possible map, and enable coherency
84 void (*smp_prepare_cpus)(unsigned int max_cpus);
87 * Perform platform specific initialisation of the specified CPU.
89 void (*smp_secondary_init)(unsigned int cpu);
91 * Boot a secondary CPU, and assign it the specified idle task.
92 * This also gives us the initial stack to use for this CPU.
94 int (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
95 #ifdef CONFIG_HOTPLUG_CPU
96 int (*cpu_kill)(unsigned int cpu);
97 void (*cpu_die)(unsigned int cpu);
98 bool (*cpu_can_disable)(unsigned int cpu);
99 int (*cpu_disable)(unsigned int cpu);
104 struct of_cpu_method {
106 const struct smp_operations *ops;
109 #define CPU_METHOD_OF_DECLARE(name, _method, _ops) \
110 static const struct of_cpu_method __cpu_method_of_table_##name \
111 __used __section("__cpu_method_of_table") \
112 = { .method = _method, .ops = _ops }
114 * set platform specific SMP operations
116 extern void smp_set_ops(const struct smp_operations *);
118 #endif /* ifndef __ASM_ARM_SMP_H */