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		unsigned long 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);
72
73extern int __cpu_disable(void);
74
75extern void __cpu_die(unsigned int cpu);
76extern void cpu_die(void);
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
84extern void smp_send_all_cpu_backtrace(void);
85
86struct smp_operations {
87#ifdef CONFIG_SMP
88	/*
89	 * Setup the set of possible CPUs (via set_cpu_possible)
90	 */
91	void (*smp_init_cpus)(void);
92	/*
93	 * Initialize cpu_possible map, and enable coherency
94	 */
95	void (*smp_prepare_cpus)(unsigned int max_cpus);
96
97	/*
98	 * Perform platform specific initialisation of the specified CPU.
99	 */
100	void (*smp_secondary_init)(unsigned int cpu);
101	/*
102	 * Boot a secondary CPU, and assign it the specified idle task.
103	 * This also gives us the initial stack to use for this CPU.
104	 */
105	int  (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
106#ifdef CONFIG_HOTPLUG_CPU
107	int  (*cpu_kill)(unsigned int cpu);
108	void (*cpu_die)(unsigned int cpu);
109	int  (*cpu_disable)(unsigned int cpu);
110#endif
111#endif
112};
113
114struct of_cpu_method {
115	const char *method;
116	struct smp_operations *ops;
117};
118
119#define CPU_METHOD_OF_DECLARE(name, _method, _ops)			\
120	static const struct of_cpu_method __cpu_method_of_table_##name	\
121		__used __section(__cpu_method_of_table)			\
122		= { .method = _method, .ops = _ops }
123/*
124 * set platform specific SMP operations
125 */
126extern void smp_set_ops(struct smp_operations *);
127
128#endif /* ifndef __ASM_ARM_SMP_H */
129