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/errno.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 int smp_call_function(void(*func)(void *info), void *info, int retry, int wait); 56 57 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, 58 int retry, int wait); 59 60 /* 61 * Call a function on all processors 62 */ 63 int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait); 64 65 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ 66 #define MSG_ALL 0x8001 67 68 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ 69 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's 70 * when rebooting 71 */ 72 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ 73 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ 74 75 /* 76 * Mark the boot cpu "online" so that it can call console drivers in 77 * printk() and can access its per-cpu storage. 78 */ 79 void smp_prepare_boot_cpu(void); 80 81 #else /* !SMP */ 82 83 /* 84 * These macros fold the SMP functionality into a single CPU system 85 */ 86 #define raw_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 #define smp_call_function_single(cpuid, func, info, retry, wait) \ 103 ({ \ 104 WARN_ON(cpuid != 0); \ 105 local_irq_disable(); \ 106 (func)(info); \ 107 local_irq_enable(); \ 108 0; \ 109 }) 110 111 #endif /* !SMP */ 112 113 /* 114 * smp_processor_id(): get the current CPU ID. 115 * 116 * if DEBUG_PREEMPT is enabled the we check whether it is 117 * used in a preemption-safe way. (smp_processor_id() is safe 118 * if it's used in a preemption-off critical section, or in 119 * a thread that is bound to the current CPU.) 120 * 121 * NOTE: raw_smp_processor_id() is for internal use only 122 * (smp_processor_id() is the preferred variant), but in rare 123 * instances it might also be used to turn off false positives 124 * (i.e. smp_processor_id() use that the debugging code reports but 125 * which use for some reason is legal). Don't use this to hack around 126 * the warning message, as your code might not work under PREEMPT. 127 */ 128 #ifdef CONFIG_DEBUG_PREEMPT 129 extern unsigned int debug_smp_processor_id(void); 130 # define smp_processor_id() debug_smp_processor_id() 131 #else 132 # define smp_processor_id() raw_smp_processor_id() 133 #endif 134 135 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 136 #define put_cpu() preempt_enable() 137 #define put_cpu_no_resched() preempt_enable_no_resched() 138 139 void smp_setup_processor_id(void); 140 141 #endif /* __LINUX_SMP_H */ 142