include/linux/smp.h

17422 #ifndef __LINUX_SMP_H
17423 #define __LINUX_SMP_H
17424 
17425 /*      Generic SMP support
17426  *              Alan Cox. <alan@cymru.net>
17427  */
17428 
17429 #ifdef __SMP__
17430 
17431 #include <asm/smp.h>
17432 
17433 /* main cross-CPU interfaces, handles INIT, TLB flush,
17434  * STOP, etc.  (defined in asm header): */
17435 
17436 /* stops all CPUs but the current one: */
17437 extern void smp_send_stop(void);
17438 
17439 /* sends a 'reschedule' event to another CPU: */
17440 extern void FASTCALL(smp_send_reschedule(int cpu));
17441 
17442 /* Boot processor call to load the other CPU's */
17443 extern void smp_boot_cpus(void);
17444 
17445 /* Processor call in. Must hold processors until .. */
17446 extern void smp_callin(void);
17447 
17448 /* Multiprocessors may now schedule */
17449 extern void smp_commence(void);
17450 
17451 /* True once the per process idle is forked */
17452 extern int smp_threads_ready;
17453 
17454 extern int smp_num_cpus;
17455 
17456 extern volatile unsigned long smp_msg_data;
17457 extern volatile int smp_src_cpu;
17458 extern volatile int smp_msg_id;
17459 
17460 /* Assume <32768 CPUs */
17461 #define MSG_ALL_BUT_SELF   0x8000
17462 #define MSG_ALL            0x8001
17463 
17464 /* Remote processor TLB invalidate */
17465 #define MSG_INVALIDATE_TLB 0x0001
17466 /* Sent to shut down slave CPUs when rebooting */
17467 #define MSG_STOP_CPU            0x0002
17468 /* Reschedule request from master CPU*/
17469 #define MSG_RESCHEDULE          0x0003
17470 /* Change MTRR */
17471 #define MSG_MTRR_CHANGE         0x0004
17472 
17473 #else
17474 
17475 /* These macros fold the SMP functionality into a single
17476  * CPU system */
17477 
17478 #define smp_num_cpus                    1
17479 #define smp_processor_id()              0
17480 #define hard_smp_processor_id()         0
17481 #define smp_threads_ready               1
17482 #define kernel_lock()
17483 #define cpu_logical_map(cpu)            0
17484 
17485 #endif
17486 #endif