LXR linux-bk/include/linux/smp.h

   1#ifndef __LINUX_SMP_H
   2#define __LINUX_SMP_H
   3
   4/*
   5 *      Generic SMP support
   6 *              Alan Cox. <alan@redhat.com>
   7 */
   8
   9#include <linux/config.h>
  10
  11#ifdef CONFIG_SMP
  12
  13#include <linux/preempt.h>
  14#include <linux/kernel.h>
  15#include <linux/compiler.h>
  16#include <linux/thread_info.h>
  17#include <asm/smp.h>
  18#include <asm/bug.h>
  19
  20/*
  21 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
  22 * (defined in asm header):
  23 */ 
  24
  25/*
  26 * stops all CPUs but the current one:
  27 */
  28extern void smp_send_stop(void);
  29
  30/*
  31 * sends a 'reschedule' event to another CPU:
  32 */
  33extern void smp_send_reschedule(int cpu);
  34
  35
  36/*
  37 * Prepare machine for booting other CPUs.
  38 */
  39extern void smp_prepare_cpus(unsigned int max_cpus);
  40
  41/*
  42 * Bring a CPU up
  43 */
  44extern int __cpu_up(unsigned int cpunum);
  45
  46/*
  47 * Final polishing of CPUs
  48 */
  49extern void smp_cpus_done(unsigned int max_cpus);
  50
  51/*
  52 * Call a function on all other processors
  53 */
  54extern int smp_call_function (void (*func) (void *info), void *info,
  55                              int retry, int wait);
  56
  57/*
  58 * Call a function on all processors
  59 */
  60static inline int on_each_cpu(void (*func) (void *info), void *info,
  61                              int retry, int wait)
  62{
  63        int ret = 0;
  64
  65        preempt_disable();
  66        ret = smp_call_function(func, info, retry, wait);
  67        func(info);
  68        preempt_enable();
  69        return ret;
  70}
  71
  72/*
  73 * True once the per process idle is forked
  74 */
  75extern int smp_threads_ready;
  76
  77#define MSG_ALL_BUT_SELF        0x8000  /* Assume <32768 CPU's */
  78#define MSG_ALL                 0x8001
  79
  80#define MSG_INVALIDATE_TLB      0x0001  /* Remote processor TLB invalidate */
  81#define MSG_STOP_CPU            0x0002  /* Sent to shut down slave CPU's
  82                                         * when rebooting
  83                                         */
  84#define MSG_RESCHEDULE          0x0003  /* Reschedule request from master CPU*/
  85#define MSG_CALL_FUNCTION       0x0004  /* Call function on all other CPUs */
  86
  87/*
  88 * Mark the boot cpu "online" so that it can call console drivers in
  89 * printk() and can access its per-cpu storage.
  90 */
  91void smp_prepare_boot_cpu(void);
  92
  93#else /* !SMP */
  94
  95/*
  96 *      These macros fold the SMP functionality into a single CPU system
  97 */
  98 
  99#define smp_processor_id()                      0
 100#define hard_smp_processor_id()                 0
 101#define smp_threads_ready                       1
 102#define smp_call_function(func,info,retry,wait) ({ 0; })
 103#define on_each_cpu(func,info,retry,wait)       ({ func(info); 0; })
 104static inline void smp_send_reschedule(int cpu) { }
 105#define num_booting_cpus()                      1
 106#define smp_prepare_boot_cpu()                  do {} while (0)
 107
 108#endif /* !SMP */
 109
 110#define get_cpu()               ({ preempt_disable(); smp_processor_id(); })
 111#define put_cpu()               preempt_enable()
 112#define put_cpu_no_resched()    preempt_enable_no_resched()
 113
 114#endif /* __LINUX_SMP_H */
 115