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 #include <asm/bug.h> 21 22 /* 23 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. 24 * (defined in asm header): 25 */ 26 27 /* 28 * stops all CPUs but the current one: 29 */ 30 extern void smp_send_stop(void); 31 32 /* 33 * sends a 'reschedule' event to another CPU: 34 */ 35 extern void smp_send_reschedule(int cpu); 36 37 38 /* 39 * Prepare machine for booting other CPUs. 40 */ 41 extern void smp_prepare_cpus(unsigned int max_cpus); 42 43 /* 44 * Bring a CPU up 45 */ 46 extern int __cpu_up(unsigned int cpunum); 47 48 /* 49 * Final polishing of CPUs 50 */ 51 extern void smp_cpus_done(unsigned int max_cpus); 52 53 /* 54 * Call a function on all other processors 55 */ 56 extern int smp_call_function (void (*func) (void *info), void *info, 57 int retry, int wait); 58 59 /* 60 * Call a function on all processors 61 */ 62 static inline int on_each_cpu(void (*func) (void *info), void *info, 63 int retry, int wait) 64 { 65 int ret = 0; 66 67 preempt_disable(); 68 ret = smp_call_function(func, info, retry, wait); 69 func(info); 70 preempt_enable(); 71 return ret; 72 } 73 74 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 75 #define MSG_ALL 0x8001 76 77 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 78 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 79 * when rebooting 80 */ 81 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 82 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 83 84 /* 85 * Mark the boot cpu "online" so that it can call console drivers in 86 * printk() and can access its per-cpu storage. 87 */ 88 void smp_prepare_boot_cpu(void); 89 90 #else /* !SMP */ 91 92 /* 93 * These macros fold the SMP functionality into a single CPU system 94 */ 95 #define raw_smp_processor_id() 0 96 #define hard_smp_processor_id() 0 97 #define smp_call_function(func,info,retry,wait) ({ 0; }) 98 #define on_each_cpu(func,info,retry,wait) ({ func(info); 0; }) 99 static inline void smp_send_reschedule(int cpu) { } 100 #define num_booting_cpus() 1 101 #define smp_prepare_boot_cpu() do {} while (0) 102 103 #endif /* !SMP */ 104 105 /* 106 * smp_processor_id(): get the current CPU ID. 107 * 108 * if DEBUG_PREEMPT is enabled the we check whether it is 109 * used in a preemption-safe way. (smp_processor_id() is safe 110 * if it's used in a preemption-off critical section, or in 111 * a thread that is bound to the current CPU.) 112 * 113 * NOTE: raw_smp_processor_id() is for internal use only 114 * (smp_processor_id() is the preferred variant), but in rare 115 * instances it might also be used to turn off false positives 116 * (i.e. smp_processor_id() use that the debugging code reports but 117 * which use for some reason is legal). Don't use this to hack around 118 * the warning message, as your code might not work under PREEMPT. 119 */ 120 #ifdef CONFIG_DEBUG_PREEMPT 121 extern unsigned int debug_smp_processor_id(void); 122 # define smp_processor_id() debug_smp_processor_id() 123 #else 124 # define smp_processor_id() raw_smp_processor_id() 125 #endif 126 127 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 128 #define put_cpu() preempt_enable() 129 #define put_cpu_no_resched() preempt_enable_no_resched() 130 131 #endif /* __LINUX_SMP_H */ 132