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
10extern void cpu_idle(void);
11
12#ifdef CONFIG_SMP
13
14#include <linux/preempt.h>
15#include <linux/kernel.h>
16#include <linux/compiler.h>
17#include <linux/thread_info.h>
18#include <asm/smp.h>
19
20/*
21 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
22 * (defined in asm header):
23 */
24
25/*
26 * stops all CPUs but the current one:
27 */
28extern void smp_send_stop(void);
29
30/*
31 * sends a 'reschedule' event to another CPU:
32 */
33extern void smp_send_reschedule(int cpu);
34
35
36/*
37 * Prepare machine for booting other CPUs.
38 */
39extern void smp_prepare_cpus(unsigned int max_cpus);
40
41/*
42 * Bring a CPU up
43 */
44extern int __cpu_up(unsigned int cpunum);
45
46/*
47 * Final polishing of CPUs
48 */
49extern void smp_cpus_done(unsigned int max_cpus);
50
51/*
52 * Call a function on all other processors
53 */
54int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
55
56/*
57 * Call a function on all processors
58 */
59int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
60
61#define MSG_ALL_BUT_SELF	0x8000	/* Assume <32768 CPU's */
62#define MSG_ALL			0x8001
63
64#define MSG_INVALIDATE_TLB	0x0001	/* Remote processor TLB invalidate */
65#define MSG_STOP_CPU		0x0002	/* Sent to shut down slave CPU's
66					 * when rebooting
67					 */
68#define MSG_RESCHEDULE		0x0003	/* Reschedule request from master CPU*/
69#define MSG_CALL_FUNCTION       0x0004  /* Call function on all other CPUs */
70
71/*
72 * Mark the boot cpu "online" so that it can call console drivers in
73 * printk() and can access its per-cpu storage.
74 */
75void smp_prepare_boot_cpu(void);
76
77#else /* !SMP */
78
79/*
80 *	These macros fold the SMP functionality into a single CPU system
81 */
82#define raw_smp_processor_id()			0
83#define hard_smp_processor_id()			0
84static inline int up_smp_call_function(void)
85{
86	return 0;
87}
88#define smp_call_function(func,info,retry,wait)	(up_smp_call_function())
89#define on_each_cpu(func,info,retry,wait)	\
90	({					\
91		local_irq_disable();		\
92		func(info);			\
93		local_irq_enable();		\
94		0;				\
95	})
96static inline void smp_send_reschedule(int cpu) { }
97#define num_booting_cpus()			1
98#define smp_prepare_boot_cpu()			do {} while (0)
99
100#endif /* !SMP */
101
102/*
103 * smp_processor_id(): get the current CPU ID.
104 *
105 * if DEBUG_PREEMPT is enabled the we check whether it is
106 * used in a preemption-safe way. (smp_processor_id() is safe
107 * if it's used in a preemption-off critical section, or in
108 * a thread that is bound to the current CPU.)
109 *
110 * NOTE: raw_smp_processor_id() is for internal use only
111 * (smp_processor_id() is the preferred variant), but in rare
112 * instances it might also be used to turn off false positives
113 * (i.e. smp_processor_id() use that the debugging code reports but
114 * which use for some reason is legal). Don't use this to hack around
115 * the warning message, as your code might not work under PREEMPT.
116 */
117#ifdef CONFIG_DEBUG_PREEMPT
118  extern unsigned int debug_smp_processor_id(void);
119# define smp_processor_id() debug_smp_processor_id()
120#else
121# define smp_processor_id() raw_smp_processor_id()
122#endif
123
124#define get_cpu()		({ preempt_disable(); smp_processor_id(); })
125#define put_cpu()		preempt_enable()
126#define put_cpu_no_resched()	preempt_enable_no_resched()
127
128void smp_setup_processor_id(void);
129
130#endif /* __LINUX_SMP_H */
131