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#include <asm/smp.h>
11
12#ifdef CONFIG_SMP
13
14#include <linux/kernel.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 */
24extern void smp_send_stop(void);
25
26/*
27 * sends a 'reschedule' event to another CPU:
28 */
29extern void FASTCALL(smp_send_reschedule(int cpu));
30
31
32/*
33 * Boot processor call to load the other CPU's
34 */
35extern void smp_boot_cpus(void);
36
37/*
38 * Processor call in. Must hold processors until ..
39 */
40extern void smp_callin(void);
41
42/*
43 * Multiprocessors may now schedule
44 */
45extern void smp_commence(void);
46
47/*
48 * Call a function on all other processors
49 */
50extern 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 */
56extern int smp_threads_ready;
57
58extern int smp_num_cpus;
59
60extern volatile unsigned long smp_msg_data;
61extern volatile int smp_src_cpu;
62extern 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