6 * Alan Cox. <alan@redhat.com>
9 #include <linux/config.h>
13 #include <linux/preempt.h>
14 #include <linux/kernel.h>
15 #include <linux/compiler.h>
16 #include <linux/thread_info.h>
21 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
22 * (defined in asm header):
26 * stops all CPUs but the current one:
28 extern void smp_send_stop(void);
31 * sends a 'reschedule' event to another CPU:
33 extern void FASTCALL(smp_send_reschedule(int cpu));
37 * Prepare machine for booting other CPUs.
39 extern void smp_prepare_cpus(unsigned int max_cpus);
44 extern int __cpu_up(unsigned int cpunum);
47 * Final polishing of CPUs
49 extern void smp_cpus_done(unsigned int max_cpus);
52 * Call a function on all other processors
54 extern int smp_call_function (void (*func) (void *info), void *info,
58 * Call a function on all processors
60 static inline int on_each_cpu(void (*func) (void *info), void *info,
66 ret = smp_call_function(func, info, retry, wait);
73 * True once the per process idle is forked
75 extern int smp_threads_ready;
77 extern volatile unsigned long smp_msg_data;
78 extern volatile int smp_src_cpu;
79 extern volatile int smp_msg_id;
81 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
82 #define MSG_ALL 0x8001
84 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
85 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
88 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
89 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
91 struct notifier_block;
93 /* Need to know about CPUs going up/down? */
94 extern int register_cpu_notifier(struct notifier_block *nb);
95 extern void unregister_cpu_notifier(struct notifier_block *nb);
97 int cpu_up(unsigned int cpu);
100 * Mark the boot cpu "online" so that it can call console drivers in
101 * printk() and can access its per-cpu storage.
103 void smp_prepare_boot_cpu(void);
108 * These macros fold the SMP functionality into a single CPU system
111 #define smp_processor_id() 0
112 #define hard_smp_processor_id() 0
113 #define smp_threads_ready 1
114 #define smp_call_function(func,info,retry,wait) ({ 0; })
115 #define on_each_cpu(func,info,retry,wait) ({ func(info); 0; })
116 static inline void smp_send_reschedule(int cpu) { }
117 static inline void smp_send_reschedule_all(void) { }
118 #define cpu_online_map 1
119 #define cpu_online(cpu) ({ BUG_ON((cpu) != 0); 1; })
120 #define num_online_cpus() 1
121 #define num_booting_cpus() 1
122 #define cpu_possible(cpu) ({ BUG_ON((cpu) != 0); 1; })
123 #define smp_prepare_boot_cpu() do {} while (0)
125 struct notifier_block;
127 /* Need to know about CPUs going up/down? */
128 static inline int register_cpu_notifier(struct notifier_block *nb)
132 static inline void unregister_cpu_notifier(struct notifier_block *nb)
137 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
138 #define put_cpu() preempt_enable()
139 #define put_cpu_no_resched() preempt_enable_no_resched()
141 #endif /* __LINUX_SMP_H */