1#ifndef __LINUX_SMP_H 2#define __LINUX_SMP_H 3 4/* 5 * Generic SMP support 6 * Alan Cox. <alan@redhat.com> 7 */ 8 9 10extern void cpu_idle(void); 11 12#ifdef CONFIG_SMP 13 14#include <linux/preempt.h> 15#include <linux/kernel.h> 16#include <linux/compiler.h> 17#include <linux/thread_info.h> 18#include <asm/smp.h> 19 20/* 21 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 22 * (defined in asm header): 23 */ 24 25/* 26 * stops all CPUs but the current one: 27 */ 28extern void smp_send_stop(void); 29 30/* 31 * sends a 'reschedule' event to another CPU: 32 */ 33extern void smp_send_reschedule(int cpu); 34 35 36/* 37 * Prepare machine for booting other CPUs. 38 */ 39extern void smp_prepare_cpus(unsigned int max_cpus); 40 41/* 42 * Bring a CPU up 43 */ 44extern int __cpu_up(unsigned int cpunum); 45 46/* 47 * Final polishing of CPUs 48 */ 49extern void smp_cpus_done(unsigned int max_cpus); 50 51/* 52 * Call a function on all other processors 53 */ 54int smp_call_function(void(*func)(void *info), void *info, int retry, int wait); 55 56/* 57 * Call a function on all processors 58 */ 59int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait); 60 61#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 62#define MSG_ALL 0x8001 63 64#define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 65#define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 66 * when rebooting 67 */ 68#define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 69#define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 70 71/* 72 * Mark the boot cpu "online" so that it can call console drivers in 73 * printk() and can access its per-cpu storage. 74 */ 75void smp_prepare_boot_cpu(void); 76 77#else /* !SMP */ 78 79/* 80 * These macros fold the SMP functionality into a single CPU system 81 */ 82#define raw_smp_processor_id() 0 83#define hard_smp_processor_id() 0 84static inline int up_smp_call_function(void) 85{ 86 return 0; 87} 88#define smp_call_function(func,info,retry,wait) (up_smp_call_function()) 89#define on_each_cpu(func,info,retry,wait) \ 90 ({ \ 91 local_irq_disable(); \ 92 func(info); \ 93 local_irq_enable(); \ 94 0; \ 95 }) 96static inline void smp_send_reschedule(int cpu) { } 97#define num_booting_cpus() 1 98#define smp_prepare_boot_cpu() do {} while (0) 99 100#endif /* !SMP */ 101 102/* 103 * smp_processor_id(): get the current CPU ID. 104 * 105 * if DEBUG_PREEMPT is enabled the we check whether it is 106 * used in a preemption-safe way. (smp_processor_id() is safe 107 * if it's used in a preemption-off critical section, or in 108 * a thread that is bound to the current CPU.) 109 * 110 * NOTE: raw_smp_processor_id() is for internal use only 111 * (smp_processor_id() is the preferred variant), but in rare 112 * instances it might also be used to turn off false positives 113 * (i.e. smp_processor_id() use that the debugging code reports but 114 * which use for some reason is legal). Don't use this to hack around 115 * the warning message, as your code might not work under PREEMPT. 116 */ 117#ifdef CONFIG_DEBUG_PREEMPT 118 extern unsigned int debug_smp_processor_id(void); 119# define smp_processor_id() debug_smp_processor_id() 120#else 121# define smp_processor_id() raw_smp_processor_id() 122#endif 123 124#define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 125#define put_cpu() preempt_enable() 126#define put_cpu_no_resched() preempt_enable_no_resched() 127 128void smp_setup_processor_id(void); 129 130#endif /* __LINUX_SMP_H */ 131