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@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 externvoidsmp_send_stop(void);
 25
 26 /*
 27  * sends a 'reschedule' event to another CPU:
 28  */
 29 externvoidFASTCALL(smp_send_reschedule(int cpu));
 30
 31
 32 /*
 33  * Boot processor call to load the other CPU's
 34  */
 35 externvoidsmp_boot_cpus(void);
 36
 37 /*
 38  * Processor call in. Must hold processors until ..
 39  */
 40 externvoidsmp_callin(void);
 41
 42 /*
 43  * Multiprocessors may now schedule
 44  */
 45 externvoidsmp_commence(void);
 46
 47 /*
 48  * Call a function on all other processors
 49  */
 50 externintsmp_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 externint smp_threads_ready;
 57
 58 externint smp_num_cpus;
 59
 60 extern volatileunsigned long smp_msg_data;
 61 extern volatileint smp_src_cpu;
 62 extern volatileint 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