1 #ifndef __LINUX_SMP_H 2 #define __LINUX_SMP_H 3 4 /* 5 * Generic SMP support 6 * Alan Cox. <alan (at) redhat.com> 7 */ 8 9 10 extern 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 */ 28 extern void smp_send_stop(void); 29 30 /* 31 * sends a 'reschedule' event to another CPU: 32 */ 33 extern void smp_send_reschedule(int cpu); 34 35 36 /* 37 * Prepare machine for booting other CPUs. 38 */ 39 extern void smp_prepare_cpus(unsigned int max_cpus); 40 41 /* 42 * Bring a CPU up 43 */ 44 extern int __cpu_up(unsigned int cpunum); 45 46 /* 47 * Final polishing of CPUs 48 */ 49 extern void smp_cpus_done(unsigned int max_cpus); 50 51 /* 52 * Call a function on all other processors 53 */ 54 int smp_call_function(void(*func)(void *info), void *info, int retry, int wait); 55 56 /* 57 * Call a function on all processors 58 */ 59 int 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 */ 75 void 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 84 static 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 }) 96 static 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() 127 128 void smp_setup_processor_id(void); 129 130 #endif /* __LINUX_SMP_H */ 131
