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 extern void cpu_idle(void);
12
13 #ifdef CONFIG_SMP
14
15 #include <linux/preempt.h>
16 #include <linux/kernel.h>
17 #include <linux/compiler.h>
18 #include <linux/thread_info.h>
19 #include <asm/smp.h>
20 #include <asm/bug.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 extern int smp_call_function (void (*func) (void *info), void *info,
57 int retry, int wait);
58
59 /*
60 * Call a function on all processors
61 */
62 static inline int on_each_cpu(void (*func) (void *info), void *info,
63 int retry, int wait)
64 {
65 int ret = 0;
66
67 preempt_disable();
68 ret = smp_call_function(func, info, retry, wait);
69 func(info);
70 preempt_enable();
71 return ret;
72 }
73
74 /*
75 * True once the per process idle is forked
76 */
77 extern int smp_threads_ready;
78
79 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
80 #define MSG_ALL 0x8001
81
82 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
83 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
84 * when rebooting
85 */
86 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
87 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
88
89 /*
90 * Mark the boot cpu "online" so that it can call console drivers in
91 * printk() and can access its per-cpu storage.
92 */
93 void smp_prepare_boot_cpu(void);
94
95 #else /* !SMP */
96
97 /*
98 * These macros fold the SMP functionality into a single CPU system
99 */
100
101 #if !defined(__smp_processor_id) || !defined(CONFIG_PREEMPT)
102 # define smp_processor_id() 0
103 #endif
104 #define hard_smp_processor_id() 0
105 #define smp_threads_ready 1
106 #define smp_call_function(func,info,retry,wait) ({ 0; })
107 #define on_each_cpu(func,info,retry,wait) ({ func(info); 0; })
108 static inline void smp_send_reschedule(int cpu) { }
109 #define num_booting_cpus() 1
110 #define smp_prepare_boot_cpu() do {} while (0)
111
112 #endif /* !SMP */
113
114 /*
115 * DEBUG_PREEMPT support: check whether smp_processor_id() is being
116 * used in a preemption-safe way.
117 *
118 * An architecture has to enable this debugging code explicitly.
119 * It can do so by renaming the smp_processor_id() macro to
120 * __smp_processor_id(). This should only be done after some minimal
121 * testing, because usually there are a number of false positives
122 * that an architecture will trigger.
123 *
124 * To fix a false positive (i.e. smp_processor_id() use that the
125 * debugging code reports but which use for some reason is legal),
126 * change the smp_processor_id() reference to _smp_processor_id(),
127 * which is the nondebug variant. NOTE: don't use this to hack around
128 * real bugs.
129 */
130 #ifdef __smp_processor_id
131 # if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT)
132 extern unsigned int smp_processor_id(void);
133 # else
134 # define smp_processor_id() __smp_processor_id()
135 # endif
136 # define _smp_processor_id() __smp_processor_id()
137 #else
138 # define _smp_processor_id() smp_processor_id()
139 #endif
140
141 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
142 #define put_cpu() preempt_enable()
143 #define put_cpu_no_resched() preempt_enable_no_resched()
144
145 #endif /* __LINUX_SMP_H */
146
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