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
  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 */