LXR linux/arch/arm/include/asm/smp.h

   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 * Boot a secondary CPU, and assign it the specified idle task.
  53 * This also gives us the initial stack to use for this CPU.
  54 */
  55extern int boot_secondary(unsigned int cpu, struct task_struct *);
  56
  57/*
  58 * Called from platform specific assembly code, this is the
  59 * secondary CPU entry point.
  60 */
  61asmlinkage void secondary_start_kernel(void);
  62
  63
  64/*
  65 * Initial data for bringing up a secondary CPU.
  66 */
  67struct secondary_data {
  68        union {
  69                unsigned long mpu_rgn_szr;
  70                unsigned long pgdir;
  71        };
  72        unsigned long swapper_pg_dir;
  73        void *stack;
  74};
  75extern struct secondary_data secondary_data;
  76extern volatile int pen_release;
  77extern void secondary_startup(void);
  78
  79extern int __cpu_disable(void);
  80
  81extern void __cpu_die(unsigned int cpu);
  82extern void cpu_die(void);
  83
  84extern void arch_send_call_function_single_ipi(int cpu);
  85extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  86extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
  87
  88extern int register_ipi_completion(struct completion *completion, int cpu);
  89
  90struct smp_operations {
  91#ifdef CONFIG_SMP
  92        /*
  93         * Setup the set of possible CPUs (via set_cpu_possible)
  94         */
  95        void (*smp_init_cpus)(void);
  96        /*
  97         * Initialize cpu_possible map, and enable coherency
  98         */
  99        void (*smp_prepare_cpus)(unsigned int max_cpus);
 100
 101        /*
 102         * Perform platform specific initialisation of the specified CPU.
 103         */
 104        void (*smp_secondary_init)(unsigned int cpu);
 105        /*
 106         * Boot a secondary CPU, and assign it the specified idle task.
 107         * This also gives us the initial stack to use for this CPU.
 108         */
 109        int  (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
 110#ifdef CONFIG_HOTPLUG_CPU
 111        int  (*cpu_kill)(unsigned int cpu);
 112        void (*cpu_die)(unsigned int cpu);
 113        int  (*cpu_disable)(unsigned int cpu);
 114#endif
 115#endif
 116};
 117
 118struct of_cpu_method {
 119        const char *method;
 120        struct smp_operations *ops;
 121};
 122
 123#define CPU_METHOD_OF_DECLARE(name, _method, _ops)                      \
 124        static const struct of_cpu_method __cpu_method_of_table_##name  \
 125                __used __section(__cpu_method_of_table)                 \
 126                = { .method = _method, .ops = _ops }
 127/*
 128 * set platform specific SMP operations
 129 */
 130extern void smp_set_ops(struct smp_operations *);
 131
 132#endif /* ifndef __ASM_ARM_SMP_H */
 133