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1da177e4 LT |
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 | #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ | |
75 | #define MSG_ALL 0x8001 | |
76 | ||
77 | #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ | |
78 | #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's | |
79 | * when rebooting | |
80 | */ | |
81 | #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ | |
82 | #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ | |
83 | ||
84 | /* | |
85 | * Mark the boot cpu "online" so that it can call console drivers in | |
86 | * printk() and can access its per-cpu storage. | |
87 | */ | |
88 | void smp_prepare_boot_cpu(void); | |
89 | ||
90 | #else /* !SMP */ | |
91 | ||
92 | /* | |
93 | * These macros fold the SMP functionality into a single CPU system | |
94 | */ | |
39c715b7 | 95 | #define raw_smp_processor_id() 0 |
1da177e4 | 96 | #define hard_smp_processor_id() 0 |
1da177e4 | 97 | #define num_booting_cpus() 1 |
79a88102 RH |
98 | |
99 | static inline int smp_call_function(void (*func) (void *), void *info, | |
100 | int retry, int wait) | |
101 | { | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static inline int on_each_cpu(void (*func) (void *), void *info, | |
106 | int retry, int wait) | |
107 | { | |
108 | func(info); | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static inline void smp_send_reschedule(int cpu) { } | |
113 | static inline void smp_prepare_boot_cpu(void) { } | |
1da177e4 LT |
114 | |
115 | #endif /* !SMP */ | |
116 | ||
117 | /* | |
39c715b7 | 118 | * smp_processor_id(): get the current CPU ID. |
1da177e4 | 119 | * |
39c715b7 IM |
120 | * if DEBUG_PREEMPT is enabled the we check whether it is |
121 | * used in a preemption-safe way. (smp_processor_id() is safe | |
122 | * if it's used in a preemption-off critical section, or in | |
123 | * a thread that is bound to the current CPU.) | |
1da177e4 | 124 | * |
39c715b7 IM |
125 | * NOTE: raw_smp_processor_id() is for internal use only |
126 | * (smp_processor_id() is the preferred variant), but in rare | |
127 | * instances it might also be used to turn off false positives | |
128 | * (i.e. smp_processor_id() use that the debugging code reports but | |
129 | * which use for some reason is legal). Don't use this to hack around | |
130 | * the warning message, as your code might not work under PREEMPT. | |
1da177e4 | 131 | */ |
39c715b7 IM |
132 | #ifdef CONFIG_DEBUG_PREEMPT |
133 | extern unsigned int debug_smp_processor_id(void); | |
134 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 135 | #else |
39c715b7 | 136 | # define smp_processor_id() raw_smp_processor_id() |
1da177e4 LT |
137 | #endif |
138 | ||
139 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) | |
140 | #define put_cpu() preempt_enable() | |
141 | #define put_cpu_no_resched() preempt_enable_no_resched() | |
142 | ||
143 | #endif /* __LINUX_SMP_H */ |