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