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
92