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 unsigned long mpu_rgn_szr; 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