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/kernel.h>
  14 #include <asm/smp.h>
  15
  16 /*
  17  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
  18  * (defined in asm header):
  19  */
  20
  21 /*
  22  * stops all CPUs but the current one:
  23  */
  24 extern void smp_send_stop(void);
  25
  26 /*
  27  * sends a 'reschedule' event to another CPU:
  28  */
  29 extern void FASTCALL(smp_send_reschedule(int cpu));
  30
  31
  32 /*
  33  * Boot processor call to load the other CPU's
  34  */
  35 extern void smp_boot_cpus(void);
  36
  37 /*
  38  * Processor call in. Must hold processors until ..
  39  */
  40 extern void smp_callin(void);
  41
  42 /*
  43  * Multiprocessors may now schedule
  44  */
  45 extern void smp_commence(void);
  46
  47 /*
  48  * Call a function on all other processors
  49  */
  50 extern int smp_call_function (void (*func) (void *info), void *info,
  51                               int retry, int wait);
  52
  53 /*
  54  * True once the per process idle is forked
  55  */
  56 extern int smp_threads_ready;
  57
  58 extern int smp_num_cpus;
  59
  60 extern volatile unsigned long smp_msg_data;
  61 extern volatile int smp_src_cpu;
  62 extern volatile int smp_msg_id;
  63
  64 #define MSG_ALL_BUT_SELF        0x8000  /* Assume <32768 CPU's */
  65 #define MSG_ALL                 0x8001
  66
  67 #define MSG_INVALIDATE_TLB      0x0001  /* Remote processor TLB invalidate */
  68 #define MSG_STOP_CPU            0x0002  /* Sent to shut down slave CPU's
  69                                          * when rebooting
  70                                          */
  71 #define MSG_RESCHEDULE          0x0003  /* Reschedule request from master CPU*/
  72 #define MSG_CALL_FUNCTION       0x0004  /* Call function on all other CPUs */
  73
  74 #else
  75
  76 /*
  77  *      These macros fold the SMP functionality into a single CPU system
  78  */
  79
  80 #define smp_num_cpus                            1
  81 #define smp_processor_id()                      0
  82 #define hard_smp_processor_id()                 0
  83 #define smp_threads_ready                       1
  84 #define kernel_lock()
  85 #define cpu_logical_map(cpu)                    0
  86 #define cpu_number_map(cpu)                     0
  87 #define smp_call_function(func,info,retry,wait) ({ 0; })
  88 #define cpu_online_map                          1
  89
  90 #endif
  91 #endif