6 * Alan Cox. <alan@redhat.com>
9 #include <linux/errno.h>
10 #include <linux/list.h>
11 #include <linux/cpumask.h>
13 extern void cpu_idle(void);
15 struct call_single_data {
16 struct list_head list;
17 void (*func) (void *info);
24 #include <linux/preempt.h>
25 #include <linux/kernel.h>
26 #include <linux/compiler.h>
27 #include <linux/thread_info.h>
31 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
32 * (defined in asm header):
36 * stops all CPUs but the current one:
38 extern void smp_send_stop(void);
41 * sends a 'reschedule' event to another CPU:
43 extern void smp_send_reschedule(int cpu);
47 * Prepare machine for booting other CPUs.
49 extern void smp_prepare_cpus(unsigned int max_cpus);
54 extern int __cpu_up(unsigned int cpunum);
57 * Final polishing of CPUs
59 extern void smp_cpus_done(unsigned int max_cpus);
62 * Call a function on all other processors
64 int smp_call_function(void(*func)(void *info), void *info, int wait);
65 int smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
67 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
69 void __smp_call_function_single(int cpuid, struct call_single_data *data);
72 * Generic and arch helpers
74 #ifdef CONFIG_USE_GENERIC_SMP_HELPERS
75 void generic_smp_call_function_single_interrupt(void);
76 void generic_smp_call_function_interrupt(void);
77 void ipi_call_lock(void);
78 void ipi_call_unlock(void);
79 void ipi_call_lock_irq(void);
80 void ipi_call_unlock_irq(void);
84 * Call a function on all processors
86 int on_each_cpu(void (*func) (void *info), void *info, int wait);
88 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
89 #define MSG_ALL 0x8001
91 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
92 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
95 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
96 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
99 * Mark the boot cpu "online" so that it can call console drivers in
100 * printk() and can access its per-cpu storage.
102 void smp_prepare_boot_cpu(void);
104 extern unsigned int setup_max_cpus;
109 * These macros fold the SMP functionality into a single CPU system
111 #define raw_smp_processor_id() 0
112 static inline int up_smp_call_function(void (*func)(void *), void *info)
116 #define smp_call_function(func, info, wait) \
117 (up_smp_call_function(func, info))
118 #define on_each_cpu(func,info,wait) \
120 local_irq_disable(); \
122 local_irq_enable(); \
125 static inline void smp_send_reschedule(int cpu) { }
126 #define num_booting_cpus() 1
127 #define smp_prepare_boot_cpu() do {} while (0)
128 #define smp_call_function_single(cpuid, func, info, wait) \
130 WARN_ON(cpuid != 0); \
131 local_irq_disable(); \
133 local_irq_enable(); \
136 #define smp_call_function_mask(mask, func, info, wait) \
137 (up_smp_call_function(func, info))
138 static inline void init_call_single_data(void)
144 * smp_processor_id(): get the current CPU ID.
146 * if DEBUG_PREEMPT is enabled the we check whether it is
147 * used in a preemption-safe way. (smp_processor_id() is safe
148 * if it's used in a preemption-off critical section, or in
149 * a thread that is bound to the current CPU.)
151 * NOTE: raw_smp_processor_id() is for internal use only
152 * (smp_processor_id() is the preferred variant), but in rare
153 * instances it might also be used to turn off false positives
154 * (i.e. smp_processor_id() use that the debugging code reports but
155 * which use for some reason is legal). Don't use this to hack around
156 * the warning message, as your code might not work under PREEMPT.
158 #ifdef CONFIG_DEBUG_PREEMPT
159 extern unsigned int debug_smp_processor_id(void);
160 # define smp_processor_id() debug_smp_processor_id()
162 # define smp_processor_id() raw_smp_processor_id()
165 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
166 #define put_cpu() preempt_enable()
167 #define put_cpu_no_resched() preempt_enable_no_resched()
169 void smp_setup_processor_id(void);
171 #endif /* __LINUX_SMP_H */