include/linux/smp.h

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 1 #ifndef __LINUX_SMP_H
 2 #define __LINUX_SMP_H
 3
 4 /*
 5  * Generic SMP support
 6  * Alan Cox. <alan@cymru.net>
 7  */
 8
 9 #ifdef __SMP__
 10 #include <asm/smp.h>
 11
 12 externvoidsmp_message_pass(int target,int msg,unsigned long data,int wait);
 13 externvoidsmp_boot_cpus(void);/* Boot processor call to load the other CPU's */
 14 externvoidsmp_callin(void);/* Processor call in. Must hold processors until .. */
 15 externvoidsmp_commence(void);/* Multiprocessors may now schedule */
 16 externint smp_num_cpus;
 17 externint smp_top_cpu;/* Top CPU number */
 18 externint smp_threads_ready;/* True once the per process idle is forked */
 19 #ifdef __SMP_PROF__
 20 extern volatileunsigned long smp_spins[NR_CPUS];/* count of interrupt spins */
 21 extern volatileunsigned long smp_spins_sys_idle[];/* count of idle spins */
 22 extern volatileunsigned long smp_spins_syscall[];/* count of syscall spins */
 23 extern volatileunsigned long smp_spins_syscall_cur[];/* count of syscall spins for the current
 24  call */
 25 extern volatileunsigned long smp_idle_count[1+NR_CPUS];/* count idle ticks */
 26 extern volatileunsigned long smp_idle_map;/* map with idle cpus */
 27 #else
 28 extern volatileunsigned long smp_spins;
 29 #endif
 30
 31
 32 extern volatileunsigned long smp_msg_data;
 33 extern volatileint smp_src_cpu;
 34 extern volatileint smp_msg_id;
 35
 36 #define MSG_ALL_BUT_SELF 0x8000/* Assume <32768 CPU's */
 37 #define MSG_ALL 0x8001
 38
 39 #define MSG_INVALIDATE_TLB 0x0001/* Remote processor TLB invalidate */
 40 #define MSG_STOP_CPU 0x0002/* Sent to shut down slave CPU's when rebooting */
 41 #define MSG_RESCHEDULE 0x0003/* Reschedule request from master CPU */
 42
 43 #else
 44
 45 /*
 46  * These macros fold the SMP functionality into a single CPU system
 47  */
 48
 49 #define smp_num_cpus 1
 50 #define smp_processor_id() 0
 51 #define smp_top_cpu 0
 52 #define smp_message_pass(t,m,d,w)
 53 #define smp_threads_ready 1
 54 #define kernel_lock()
 55 #endif
 56 #endif