include/asm-arm/smp.h

   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/config.h>
  14 #include <linux/threads.h>
  15 #include <linux/cpumask.h>
  16 #include <linux/thread_info.h>
  17
  18 #include <asm/arch/smp.h>
  19
  20 #ifndef CONFIG_SMP
  21 # error "<asm-arm/smp.h> included in non-SMP build"
  22 #endif
  23
  24 #define raw_smp_processor_id() (current_thread_info()->cpu)
  25
  26 /*
  27  * at the moment, there's not a big penalty for changing CPUs
  28  * (the >big< penalty is running SMP in the first place)
  29  */
  30 #define PROC_CHANGE_PENALTY             15
  31
  32 struct seq_file;
  33
  34 /*
  35  * generate IPI list text
  36  */
  37 extern void show_ipi_list(struct seq_file *p);
  38
  39 /*
  40  * Called from assembly code, this handles an IPI.
  41  */
  42 asmlinkage void do_IPI(struct pt_regs *regs);
  43
  44 /*
  45  * Setup the SMP cpu_possible_map
  46  */
  47 extern void smp_init_cpus(void);
  48
  49 /*
  50  * Move global data into per-processor storage.
  51  */
  52 extern void smp_store_cpu_info(unsigned int cpuid);
  53
  54 /*
  55  * Raise an IPI cross call on CPUs in callmap.
  56  */
  57 extern void smp_cross_call(cpumask_t callmap);
  58
  59 /*
  60  * Broadcast a timer interrupt to the other CPUs.
  61  */
  62 extern void smp_send_timer(void);
  63
  64 /*
  65  * Boot a secondary CPU, and assign it the specified idle task.
  66  * This also gives us the initial stack to use for this CPU.
  67  */
  68 extern int boot_secondary(unsigned int cpu, struct task_struct *);
  69
  70 /*
  71  * Called from platform specific assembly code, this is the
  72  * secondary CPU entry point.
  73  */
  74 asmlinkage void secondary_start_kernel(void);
  75
  76 /*
  77  * Perform platform specific initialisation of the specified CPU.
  78  */
  79 extern void platform_secondary_init(unsigned int cpu);
  80
  81 /*
  82  * Initial data for bringing up a secondary CPU.
  83  */
  84 struct secondary_data {
  85         unsigned long pgdir;
  86         void *stack;
  87 };
  88 extern struct secondary_data secondary_data;
  89
  90 extern int __cpu_disable(void);
  91 extern int mach_cpu_disable(unsigned int cpu);
  92
  93 extern void __cpu_die(unsigned int cpu);
  94 extern void cpu_die(void);
  95
  96 extern void platform_cpu_die(unsigned int cpu);
  97 extern int platform_cpu_kill(unsigned int cpu);
  98 extern void platform_cpu_enable(unsigned int cpu);
  99
 100 #ifdef CONFIG_LOCAL_TIMERS
 101 /*
 102  * Setup a local timer interrupt for a CPU.
 103  */
 104 extern void local_timer_setup(unsigned int cpu);
 105
 106 /*
 107  * Stop a local timer interrupt.
 108  */
 109 extern void local_timer_stop(unsigned int cpu);
 110
 111 /*
 112  * Platform provides this to acknowledge a local timer IRQ
 113  */
 114 extern int local_timer_ack(void);
 115
 116 #else
 117
 118 static inline void local_timer_setup(unsigned int cpu)
 119 {
 120 }
 121
 122 static inline void local_timer_stop(unsigned int cpu)
 123 {
 124 }
 125
 126 #endif
 127
 128 /*
 129  * show local interrupt info
 130  */
 131 extern void show_local_irqs(struct seq_file *);
 132
 133 /*
 134  * Called from assembly, this is the local timer IRQ handler
 135  */
 136 asmlinkage void do_local_timer(struct pt_regs *);
 137
 138 #endif /* ifndef __ASM_ARM_SMP_H */