6 * Alan Cox. <alan@redhat.com>
9 #include <linux/config.h>
11 extern void cpu_idle(void);
15 #include <linux/preempt.h>
16 #include <linux/kernel.h>
17 #include <linux/compiler.h>
18 #include <linux/thread_info.h>
22 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
23 * (defined in asm header):
27 * stops all CPUs but the current one:
29 extern void smp_send_stop(void);
32 * sends a 'reschedule' event to another CPU:
34 extern void smp_send_reschedule(int cpu);
38 * Prepare machine for booting other CPUs.
40 extern void smp_prepare_cpus(unsigned int max_cpus);
45 extern int __cpu_up(unsigned int cpunum);
48 * Final polishing of CPUs
50 extern void smp_cpus_done(unsigned int max_cpus);
53 * Call a function on all other processors
55 int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
58 * Call a function on all processors
60 int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
62 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
63 #define MSG_ALL 0x8001
65 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
66 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
69 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
70 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
73 * Mark the boot cpu "online" so that it can call console drivers in
74 * printk() and can access its per-cpu storage.
76 void smp_prepare_boot_cpu(void);
81 * These macros fold the SMP functionality into a single CPU system
83 #define raw_smp_processor_id() 0
84 #define hard_smp_processor_id() 0
85 static inline int up_smp_call_function(void)
89 #define smp_call_function(func,info,retry,wait) (up_smp_call_function())
90 #define on_each_cpu(func,info,retry,wait) \
92 local_irq_disable(); \
97 static inline void smp_send_reschedule(int cpu) { }
98 #define num_booting_cpus() 1
99 #define smp_prepare_boot_cpu() do {} while (0)
104 * smp_processor_id(): get the current CPU ID.
106 * if DEBUG_PREEMPT is enabled the we check whether it is
107 * used in a preemption-safe way. (smp_processor_id() is safe
108 * if it's used in a preemption-off critical section, or in
109 * a thread that is bound to the current CPU.)
111 * NOTE: raw_smp_processor_id() is for internal use only
112 * (smp_processor_id() is the preferred variant), but in rare
113 * instances it might also be used to turn off false positives
114 * (i.e. smp_processor_id() use that the debugging code reports but
115 * which use for some reason is legal). Don't use this to hack around
116 * the warning message, as your code might not work under PREEMPT.
118 #ifdef CONFIG_DEBUG_PREEMPT
119 extern unsigned int debug_smp_processor_id(void);
120 # define smp_processor_id() debug_smp_processor_id()
122 # define smp_processor_id() raw_smp_processor_id()
125 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
126 #define put_cpu() preempt_enable()
127 #define put_cpu_no_resched() preempt_enable_no_resched()
129 #endif /* __LINUX_SMP_H */