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
23struct seq_file;
24
25/*
26 * generate IPI list text
27 */
28extern void show_ipi_list(struct seq_file *, int);
29
30/*
31 * Called from assembly code, this handles an IPI.
32 */
33asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
34
35/*
36 * Called from C code, this handles an IPI.
37 */
38void handle_IPI(int ipinr, struct pt_regs *regs);
39
40/*
41 * Setup the set of possible CPUs (via set_cpu_possible)
42 */
43extern void smp_init_cpus(void);
44
45
46/*
47 * Provide a function to raise an IPI cross call on CPUs in callmap.
48 */
49extern 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 */
55asmlinkage void secondary_start_kernel(void);
56
57
58/*
59 * Initial data for bringing up a secondary CPU.
60 */
61struct secondary_data {
62	union {
63		unsigned long mpu_rgn_szr;
64		u64 pgdir;
65	};
66	unsigned long swapper_pg_dir;
67	void *stack;
68};
69extern struct secondary_data secondary_data;
70extern volatile int pen_release;
71extern void secondary_startup(void);
72extern void secondary_startup_arm(void);
73
74extern int __cpu_disable(void);
75
76extern void __cpu_die(unsigned int cpu);
77
78extern void arch_send_call_function_single_ipi(int cpu);
79extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
80extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
81
82extern int register_ipi_completion(struct completion *completion, int cpu);
83
84struct 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
113struct 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 */
125extern void smp_set_ops(const struct smp_operations *);
126
127#endif /* ifndef __ASM_ARM_SMP_H */
128