1 /* 2 * linux/include/asm-arm/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 #include <asm/arch/smp.h> 18 19 #ifndef CONFIG_SMP 20 # error "<asm-arm/smp.h> included in non-SMP build" 21 #endif 22 23 #define raw_smp_processor_id() (current_thread_info()->cpu) 24 25 /* 26 * at the moment, there's not a big penalty for changing CPUs 27 * (the >big< penalty is running SMP in the first place) 28 */ 29 #define PROC_CHANGE_PENALTY 15 30 31 struct seq_file; 32 33 /* 34 * generate IPI list text 35 */ 36 extern void show_ipi_list(struct seq_file *p); 37 38 /* 39 * Called from assembly code, this handles an IPI. 40 */ 41 asmlinkage void do_IPI(struct pt_regs *regs); 42 43 /* 44 * Setup the SMP cpu_possible_map 45 */ 46 extern void smp_init_cpus(void); 47 48 /* 49 * Move global data into per-processor storage. 50 */ 51 extern void smp_store_cpu_info(unsigned int cpuid); 52 53 /* 54 * Raise an IPI cross call on CPUs in callmap. 55 */ 56 extern void smp_cross_call(cpumask_t callmap); 57 58 /* 59 * Broadcast a timer interrupt to the other CPUs. 60 */ 61 extern void smp_send_timer(void); 62 63 /* 64 * Boot a secondary CPU, and assign it the specified idle task. 65 * This also gives us the initial stack to use for this CPU. 66 */ 67 extern int boot_secondary(unsigned int cpu, struct task_struct *); 68 69 /* 70 * Called from platform specific assembly code, this is the 71 * secondary CPU entry point. 72 */ 73 asmlinkage void secondary_start_kernel(void); 74 75 /* 76 * Perform platform specific initialisation of the specified CPU. 77 */ 78 extern void platform_secondary_init(unsigned int cpu); 79 80 /* 81 * Initial data for bringing up a secondary CPU. 82 */ 83 struct secondary_data { 84 unsigned long pgdir; 85 void *stack; 86 }; 87 extern struct secondary_data secondary_data; 88 89 extern int __cpu_disable(void); 90 extern int mach_cpu_disable(unsigned int cpu); 91 92 extern void __cpu_die(unsigned int cpu); 93 extern void cpu_die(void); 94 95 extern void platform_cpu_die(unsigned int cpu); 96 extern int platform_cpu_kill(unsigned int cpu); 97 extern void platform_cpu_enable(unsigned int cpu); 98 99 #ifdef CONFIG_LOCAL_TIMERS 100 /* 101 * Setup a local timer interrupt for a CPU. 102 */ 103 extern void local_timer_setup(unsigned int cpu); 104 105 /* 106 * Stop a local timer interrupt. 107 */ 108 extern void local_timer_stop(unsigned int cpu); 109 110 /* 111 * Platform provides this to acknowledge a local timer IRQ 112 */ 113 extern int local_timer_ack(void); 114 115 #else 116 local_timer_setup(unsigned int cpu)117static inline void local_timer_setup(unsigned int cpu) 118 { 119 } 120 local_timer_stop(unsigned int cpu)121static inline void local_timer_stop(unsigned int cpu) 122 { 123 } 124 125 #endif 126 127 /* 128 * show local interrupt info 129 */ 130 extern void show_local_irqs(struct seq_file *); 131 132 /* 133 * Called from assembly, this is the local timer IRQ handler 134 */ 135 asmlinkage void do_local_timer(struct pt_regs *); 136 137 #endif /* ifndef __ASM_ARM_SMP_H */ 138