1 /*
2  *  arch/arm/include/asm/smp.h
3  *
4  *  Copyright (C) 2004-2005 ARM Ltd.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #ifndef __ASM_ARM_SMP_H
11 #define __ASM_ARM_SMP_H
12 
13 #include <linux/threads.h>
14 #include <linux/cpumask.h>
15 #include <linux/thread_info.h>
16 
17 #ifndef CONFIG_SMP
18 # error "<asm/smp.h> included in non-SMP build"
19 #endif
20 
21 #define raw_smp_processor_id() (current_thread_info()->cpu)
22 
23 struct seq_file;
24 
25 /*
26  * generate IPI list text
27  */
28 extern void show_ipi_list(struct seq_file *, int);
29 
30 /*
31  * Called from assembly code, this handles an IPI.
32  */
33 asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
34 
35 /*
36  * Called from C code, this handles an IPI.
37  */
38 void handle_IPI(int ipinr, struct pt_regs *regs);
39 
40 /*
41  * Setup the set of possible CPUs (via set_cpu_possible)
42  */
43 extern void smp_init_cpus(void);
44 
45 
46 /*
47  * Provide a function to raise an IPI cross call on CPUs in callmap.
48  */
49 extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
50 
51 /*
52  * Called from platform specific assembly code, this is the
53  * secondary CPU entry point.
54  */
55 asmlinkage void secondary_start_kernel(void);
56 
57 
58 /*
59  * Initial data for bringing up a secondary CPU.
60  */
61 struct secondary_data {
62 	union {
63 		struct mpu_rgn_info *mpu_rgn_info;
64 		u64 pgdir;
65 	};
66 	unsigned long swapper_pg_dir;
67 	void *stack;
68 };
69 extern struct secondary_data secondary_data;
70 extern volatile int pen_release;
71 extern void secondary_startup(void);
72 extern void secondary_startup_arm(void);
73 
74 extern int __cpu_disable(void);
75 
76 extern void __cpu_die(unsigned int cpu);
77 
78 extern void arch_send_call_function_single_ipi(int cpu);
79 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
80 extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
81 
82 extern int register_ipi_completion(struct completion *completion, int cpu);
83 
84 struct smp_operations {
85 #ifdef CONFIG_SMP
86 	/*
87 	 * Setup the set of possible CPUs (via set_cpu_possible)
88 	 */
89 	void (*smp_init_cpus)(void);
90 	/*
91 	 * Initialize cpu_possible map, and enable coherency
92 	 */
93 	void (*smp_prepare_cpus)(unsigned int max_cpus);
94 
95 	/*
96 	 * Perform platform specific initialisation of the specified CPU.
97 	 */
98 	void (*smp_secondary_init)(unsigned int cpu);
99 	/*
100 	 * Boot a secondary CPU, and assign it the specified idle task.
101 	 * This also gives us the initial stack to use for this CPU.
102 	 */
103 	int  (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
104 #ifdef CONFIG_HOTPLUG_CPU
105 	int  (*cpu_kill)(unsigned int cpu);
106 	void (*cpu_die)(unsigned int cpu);
107 	bool  (*cpu_can_disable)(unsigned int cpu);
108 	int  (*cpu_disable)(unsigned int cpu);
109 #endif
110 #endif
111 };
112 
113 struct of_cpu_method {
114 	const char *method;
115 	const struct smp_operations *ops;
116 };
117 
118 #define CPU_METHOD_OF_DECLARE(name, _method, _ops)			\
119 	static const struct of_cpu_method __cpu_method_of_table_##name	\
120 		__used __section(__cpu_method_of_table)			\
121 		= { .method = _method, .ops = _ops }
122 /*
123  * set platform specific SMP operations
124  */
125 extern void smp_set_ops(const struct smp_operations *);
126 
127 #endif /* ifndef __ASM_ARM_SMP_H */
128