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