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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/errno.h>
10 #include <asm/system.h>
11
12 extern void cpu_idle(void);
13
14 #ifdef CONFIG_SMP
15
16 #include <linux/preempt.h>
17 #include <linux/kernel.h>
18 #include <linux/compiler.h>
19 #include <linux/thread_info.h>
20 #include <asm/smp.h>
21
22 /*
23 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
24 * (defined in asm header):
25 */
26
27 /*
28 * stops all CPUs but the current one:
29 */
30 extern void smp_send_stop(void);
31
32 /*
33 * sends a 'reschedule' event to another CPU:
34 */
35 extern void smp_send_reschedule(int cpu);
36
37
38 /*
39 * Prepare machine for booting other CPUs.
40 */
41 extern void smp_prepare_cpus(unsigned int max_cpus);
42
43 /*
44 * Bring a CPU up
45 */
46 extern int __cpu_up(unsigned int cpunum);
47
48 /*
49 * Final polishing of CPUs
50 */
51 extern void smp_cpus_done(unsigned int max_cpus);
52
53 /*
54 * Call a function on all other processors
55 */
56 int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
57
58 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
59 int retry, int wait);
60
61 /*
62 * Call a function on all processors
63 */
64 int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
65
66 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
67 #define MSG_ALL 0x8001
68
69 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
70 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
71 * when rebooting
72 */
73 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
74 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
75
76 /*
77 * Mark the boot cpu "online" so that it can call console drivers in
78 * printk() and can access its per-cpu storage.
79 */
80 void smp_prepare_boot_cpu(void);
81
82 #else /* !SMP */
83
84 /*
85 * These macros fold the SMP functionality into a single CPU system
86 */
87 #define raw_smp_processor_id() 0
88 static inline int up_smp_call_function(void)
89 {
90 return 0;
91 }
92 #define smp_call_function(func,info,retry,wait) (up_smp_call_function())
93 #define on_each_cpu(func,info,retry,wait) \
94 ({ \
95 local_irq_disable(); \
96 func(info); \
97 local_irq_enable(); \
98 0; \
99 })
100 static inline void smp_send_reschedule(int cpu) { }
101 #define num_booting_cpus() 1
102 #define smp_prepare_boot_cpu() do {} while (0)
103 static inline int smp_call_function_single(int cpuid, void (*func) (void *info),
104 void *info, int retry, int wait)
105 {
106 WARN_ON(cpuid != 0);
107 local_irq_disable();
108 func(info);
109 local_irq_enable();
110 return 0;
111 }
112
113 #endif /* !SMP */
114
115 /*
116 * smp_processor_id(): get the current CPU ID.
117 *
118 * if DEBUG_PREEMPT is enabled the we check whether it is
119 * used in a preemption-safe way. (smp_processor_id() is safe
120 * if it's used in a preemption-off critical section, or in
121 * a thread that is bound to the current CPU.)
122 *
123 * NOTE: raw_smp_processor_id() is for internal use only
124 * (smp_processor_id() is the preferred variant), but in rare
125 * instances it might also be used to turn off false positives
126 * (i.e. smp_processor_id() use that the debugging code reports but
127 * which use for some reason is legal). Don't use this to hack around
128 * the warning message, as your code might not work under PREEMPT.
129 */
130 #ifdef CONFIG_DEBUG_PREEMPT
131 extern unsigned int debug_smp_processor_id(void);
132 # define smp_processor_id() debug_smp_processor_id()
133 #else
134 # define smp_processor_id() raw_smp_processor_id()
135 #endif
136
137 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
138 #define put_cpu() preempt_enable()
139 #define put_cpu_no_resched() preempt_enable_no_resched()
140
141 void smp_setup_processor_id(void);
142
143 #endif /* __LINUX_SMP_H */