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 extern unsigned int setup_max_cpus; 82 83 #else /* !SMP */ 84 85 /* 86 * These macros fold the SMP functionality into a single CPU system 87 */ 88 #define raw_smp_processor_id() 0 89 static inline int up_smp_call_function(void (*func)(void *), void *info) 90 { 91 return 0; 92 } 93 #define smp_call_function(func, info, retry, wait) \ 94 (up_smp_call_function(func, info)) 95 #define on_each_cpu(func,info,retry,wait) \ 96 ({ \ 97 local_irq_disable(); \ 98 func(info); \ 99 local_irq_enable(); \ 100 0; \ 101 }) 102 static inline void smp_send_reschedule(int cpu) { } 103 #define num_booting_cpus() 1 104 #define smp_prepare_boot_cpu() do {} while (0) 105 #define smp_call_function_single(cpuid, func, info, retry, wait) \ 106 ({ \ 107 WARN_ON(cpuid != 0); \ 108 local_irq_disable(); \ 109 (func)(info); \ 110 local_irq_enable(); \ 111 0; \ 112 }) 113 #define smp_call_function_mask(mask, func, info, wait) \ 114 (up_smp_call_function(func, info)) 115 116 #endif /* !SMP */ 117 118 /* 119 * smp_processor_id(): get the current CPU ID. 120 * 121 * if DEBUG_PREEMPT is enabled the we check whether it is 122 * used in a preemption-safe way. (smp_processor_id() is safe 123 * if it's used in a preemption-off critical section, or in 124 * a thread that is bound to the current CPU.) 125 * 126 * NOTE: raw_smp_processor_id() is for internal use only 127 * (smp_processor_id() is the preferred variant), but in rare 128 * instances it might also be used to turn off false positives 129 * (i.e. smp_processor_id() use that the debugging code reports but 130 * which use for some reason is legal). Don't use this to hack around 131 * the warning message, as your code might not work under PREEMPT. 132 */ 133 #ifdef CONFIG_DEBUG_PREEMPT 134 extern unsigned int debug_smp_processor_id(void); 135 # define smp_processor_id() debug_smp_processor_id() 136 #else 137 # define smp_processor_id() raw_smp_processor_id() 138 #endif 139 140 #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) 141 #define put_cpu() preempt_enable() 142 #define put_cpu_no_resched() preempt_enable_no_resched() 143 144 void smp_setup_processor_id(void); 145 146 #endif /* __LINUX_SMP_H */ 147