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- #ifndef __LINUX_SMP_H
- #define __LINUX_SMP_H
-
- /*
- * Generic SMP support
- * Alan Cox. <alan@redhat.com>
- */
-
-
- #ifdef __KERNEL__
- #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;
- }
-
- /*
- * True once the per process idle is forked
- */
- extern int smp_threads_ready;
-
- #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_threads_ready 1
- #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 /* __KERNEL__ */
- #endif /* __LINUX_SMP_H */
-