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 (*func)(void *), void *info) 88 { 89 return 0; 90 } 91 #define smp_call_function(func, info, retry, wait) \ 92 (up_smp_call_function(func, info)) 93 #define on_each_cpu(func,info,retry,wait) \ 94 ({ \ 95 local_irq_disable(); \ 96 func(info); \ 97 local_irq_enable(); \ 98 0; \ 99 }) 100 static inline void smp_send_reschedule(int cpu) { } 101 #define num_booting_cpus() 1 102 #define smp_prepare_boot_cpu() do {} while (0) 103 #define smp_call_function_single(cpuid, func, info, retry, wait) \ 104 ({ \ 105 WARN_ON(cpuid != 0); \ 106 local_irq_disable(); \ 107 (func)(info); \ 108 local_irq_enable(); \ 109 0; \ 110 }) 111 #define smp_call_function_mask(mask, func, info, wait) \ 112 (up_smp_call_function(func, info)) 113 114 #endif /* !SMP */ 115 116 /* 117 * smp_processor_id(): get the current CPU ID. 118 * 119 * if DEBUG_PREEMPT is enabled the we check whether it is 120 * used in a preemption-safe way. (smp_processor_id() is safe 121 * if it's used in a preemption-off critical section, or in 122 * a thread that is bound to the current CPU.) 123 * 124 * NOTE: raw_smp_processor_id() is for internal use only 125 * (smp_processor_id() is the preferred variant), but in rare 126 * instances it might also be used to turn off false positives 127 * (i.e. smp_processor_id() use that the debugging code reports but 128 * which use for some reason is legal). Don't use this to hack around 129 * the warning message, as your code might not work under PREEMPT. 130 */ 131 #ifdef CONFIG_DEBUG_PREEMPT 132 extern unsigned int debug_smp_processor_id(void); 133 # define smp_processor_id() debug_smp_processor_id() 134 #else 135 # define smp_processor_id() raw_smp_processor_id() 136 #endif 137 138 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 139 #define put_cpu() preempt_enable() 140 #define put_cpu_no_resched() preempt_enable_no_resched() 141 142 void smp_setup_processor_id(void); 143 144 #endif /* __LINUX_SMP_H */ 145