#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 */
