#ifndef __LINUX_SMP_H #define __LINUX_SMP_H /* * Generic SMP support * Alan Cox. <alan@redhat.com> */ #include <linux/config.h> extern void cpu_idle(void); #ifdef CONFIG_SMP #include <linux/preempt.h> #include <linux/kernel.h> #include <linux/compiler.h> #include <linux/thread_info.h> #include <asm/smp.h> #include <asm/bug.h> /* * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. * (defined in asm header): */ /* * stops all CPUs but the current one: */ extern void smp_send_stop(void); /* * sends a 'reschedule' event to another CPU: */ extern void smp_send_reschedule(int cpu); /* * Prepare machine for booting other CPUs. */ extern void smp_prepare_cpus(unsigned int max_cpus); /* * Bring a CPU up */ extern int __cpu_up(unsigned int cpunum); /* * Final polishing of CPUs */ extern void smp_cpus_done(unsigned int max_cpus); /* * Call a function on all other processors */ extern int smp_call_function (void (*func) (void *info), void *info, int retry, int wait); /* * Call a function on all processors */ static inline int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait) { int ret = 0; preempt_disable(); ret = smp_call_function(func, info, retry, wait); func(info); preempt_enable(); return ret; } #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ #define MSG_ALL 0x8001 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's * when rebooting */ #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ /* * Mark the boot cpu "online" so that it can call console drivers in * printk() and can access its per-cpu storage. */ void smp_prepare_boot_cpu(void); #else /* !SMP */ /* * These macros fold the SMP functionality into a single CPU system */ #if !defined(__smp_processor_id) || !defined(CONFIG_PREEMPT) # define smp_processor_id() 0 #endif #define hard_smp_processor_id() 0 #define smp_call_function(func,info,retry,wait) ({ 0; }) #define on_each_cpu(func,info,retry,wait) ({ func(info); 0; }) static inline void smp_send_reschedule(int cpu) { } #define num_booting_cpus() 1 #define smp_prepare_boot_cpu() do {} while (0) #endif /* !SMP */ /* * DEBUG_PREEMPT support: check whether smp_processor_id() is being * used in a preemption-safe way. * * An architecture has to enable this debugging code explicitly. * It can do so by renaming the smp_processor_id() macro to * __smp_processor_id(). This should only be done after some minimal * testing, because usually there are a number of false positives * that an architecture will trigger. * * To fix a false positive (i.e. smp_processor_id() use that the * debugging code reports but which use for some reason is legal), * change the smp_processor_id() reference to _smp_processor_id(), * which is the nondebug variant. NOTE: don't use this to hack around * real bugs. */ #ifdef __smp_processor_id # if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT) extern unsigned int smp_processor_id(void); # else # define smp_processor_id() __smp_processor_id() # endif # define _smp_processor_id() __smp_processor_id() #else # define _smp_processor_id() smp_processor_id() #endif #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) #define put_cpu() preempt_enable() #define put_cpu_no_resched() preempt_enable_no_resched() #endif /* __LINUX_SMP_H */