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TOMOYO Linux Cross Reference
Linux/include/linux/cpu.h

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  1 /*
  2  * include/linux/cpu.h - generic cpu definition
  3  *
  4  * This is mainly for topological representation. We define the 
  5  * basic 'struct cpu' here, which can be embedded in per-arch 
  6  * definitions of processors.
  7  *
  8  * Basic handling of the devices is done in drivers/base/cpu.c
  9  * and system devices are handled in drivers/base/sys.c. 
 10  *
 11  * CPUs are exported via driverfs in the class/cpu/devices/
 12  * directory. 
 13  *
 14  * Per-cpu interfaces can be implemented using a struct device_interface. 
 15  * See the following for how to do this: 
 16  * - drivers/base/intf.c 
 17  * - Documentation/driver-model/interface.txt
 18  */
 19 #ifndef _LINUX_CPU_H_
 20 #define _LINUX_CPU_H_
 21 
 22 #include <linux/sysdev.h>
 23 #include <linux/node.h>
 24 #include <asm/semaphore.h>
 25 
 26 struct cpu {
 27         int node_id;            /* The node which contains the CPU */
 28         struct sys_device sysdev;
 29 };
 30 
 31 extern int register_cpu(struct cpu *, int, struct node *);
 32 struct notifier_block;
 33 
 34 #ifdef CONFIG_SMP
 35 /* Need to know about CPUs going up/down? */
 36 extern int register_cpu_notifier(struct notifier_block *nb);
 37 extern void unregister_cpu_notifier(struct notifier_block *nb);
 38 
 39 int cpu_up(unsigned int cpu);
 40 #else
 41 static inline int register_cpu_notifier(struct notifier_block *nb)
 42 {
 43         return 0;
 44 }
 45 static inline void unregister_cpu_notifier(struct notifier_block *nb)
 46 {
 47 }
 48 #endif /* CONFIG_SMP */
 49 extern struct sysdev_class cpu_sysdev_class;
 50 
 51 /* Stop CPUs going up and down. */
 52 extern struct semaphore cpucontrol;
 53 #endif /* _LINUX_CPU_H_ */
 54 

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