6 * Alan Cox. <alan@redhat.com>
10 extern void cpu_idle(void);
14 #include <linux/preempt.h>
15 #include <linux/kernel.h>
16 #include <linux/compiler.h>
17 #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 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 int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
56 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
60 * Call a function on all processors
62 int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
64 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
65 #define MSG_ALL 0x8001
67 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
68 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
71 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
72 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
75 * Mark the boot cpu "online" so that it can call console drivers in
76 * printk() and can access its per-cpu storage.
78 void smp_prepare_boot_cpu(void);
83 * These macros fold the SMP functionality into a single CPU system
85 #define raw_smp_processor_id() 0
86 #define hard_smp_processor_id() 0
87 static inline int up_smp_call_function(void)
91 #define smp_call_function(func,info,retry,wait) (up_smp_call_function())
92 #define on_each_cpu(func,info,retry,wait) \
94 local_irq_disable(); \
99 static inline void smp_send_reschedule(int cpu) { }
100 #define num_booting_cpus() 1
101 #define smp_prepare_boot_cpu() do {} while (0)
106 * smp_processor_id(): get the current CPU ID.
108 * if DEBUG_PREEMPT is enabled the we check whether it is
109 * used in a preemption-safe way. (smp_processor_id() is safe
110 * if it's used in a preemption-off critical section, or in
111 * a thread that is bound to the current CPU.)
113 * NOTE: raw_smp_processor_id() is for internal use only
114 * (smp_processor_id() is the preferred variant), but in rare
115 * instances it might also be used to turn off false positives
116 * (i.e. smp_processor_id() use that the debugging code reports but
117 * which use for some reason is legal). Don't use this to hack around
118 * the warning message, as your code might not work under PREEMPT.
120 #ifdef CONFIG_DEBUG_PREEMPT
121 extern unsigned int debug_smp_processor_id(void);
122 # define smp_processor_id() debug_smp_processor_id()
124 # define smp_processor_id() raw_smp_processor_id()
127 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
128 #define put_cpu() preempt_enable()
129 #define put_cpu_no_resched() preempt_enable_no_resched()
131 void smp_setup_processor_id(void);
133 #endif /* __LINUX_SMP_H */