1 #ifndef __LINUX_SMP_H 2 #define __LINUX_SMP_H 3 4 /* 5 * Generic SMP support 6 * Alan Cox. <[email protected]> 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 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, 57 int retry, int wait); 58 59 /* 60 * Call a function on all processors 61 */ 62 int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait); 63 64 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 65 #define MSG_ALL 0x8001 66 67 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 68 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 69 * when rebooting 70 */ 71 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 72 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 73 74 /* 75 * Mark the boot cpu "online" so that it can call console drivers in 76 * printk() and can access its per-cpu storage. 77 */ 78 void smp_prepare_boot_cpu(void); 79 80 #else /* !SMP */ 81 82 /* 83 * These macros fold the SMP functionality into a single CPU system 84 */ 85 #define raw_smp_processor_id() 0 86 #define hard_smp_processor_id() 0 87 static inline int up_smp_call_function(void) 88 { 89 return 0; 90 } 91 #define smp_call_function(func,info,retry,wait) (up_smp_call_function()) 92 #define on_each_cpu(func,info,retry,wait) \ 93 ({ \ 94 local_irq_disable(); \ 95 func(info); \ 96 local_irq_enable(); \ 97 0; \ 98 }) 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 static inline int smp_call_function_single(int cpuid, void (*func) (void *info), 103 void *info, int retry, int wait) 104 { 105 /* Disable interrupts here? */ 106 func(info); 107 return 0; 108 } 109 110 #endif /* !SMP */ 111 112 /* 113 * smp_processor_id(): get the current CPU ID. 114 * 115 * if DEBUG_PREEMPT is enabled the we check whether it is 116 * used in a preemption-safe way. (smp_processor_id() is safe 117 * if it's used in a preemption-off critical section, or in 118 * a thread that is bound to the current CPU.) 119 * 120 * NOTE: raw_smp_processor_id() is for internal use only 121 * (smp_processor_id() is the preferred variant), but in rare 122 * instances it might also be used to turn off false positives 123 * (i.e. smp_processor_id() use that the debugging code reports but 124 * which use for some reason is legal). Don't use this to hack around 125 * the warning message, as your code might not work under PREEMPT. 126 */ 127 #ifdef CONFIG_DEBUG_PREEMPT 128 extern unsigned int debug_smp_processor_id(void); 129 # define smp_processor_id() debug_smp_processor_id() 130 #else 131 # define smp_processor_id() raw_smp_processor_id() 132 #endif 133 134 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 135 #define put_cpu() preempt_enable() 136 #define put_cpu_no_resched() preempt_enable_no_resched() 137 138 void smp_setup_processor_id(void); 139 140 #endif /* __LINUX_SMP_H */ 141