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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 | ||
79974a0e | 9 | #include <linux/errno.h> |
a52b1752 | 10 | #include <asm/system.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
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 | */ | |
78eef01b | 56 | int smp_call_function(void(*func)(void *info), void *info, int retry, int wait); |
1da177e4 | 57 | |
a3bc0dbc AM |
58 | int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, |
59 | int retry, int wait); | |
60 | ||
1da177e4 LT |
61 | /* |
62 | * Call a function on all processors | |
63 | */ | |
78eef01b | 64 | int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait); |
1da177e4 LT |
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 | */ | |
39c715b7 | 87 | #define raw_smp_processor_id() 0 |
3c30b06d CK |
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()) | |
78eef01b AM |
93 | #define on_each_cpu(func,info,retry,wait) \ |
94 | ({ \ | |
95 | local_irq_disable(); \ | |
96 | func(info); \ | |
97 | local_irq_enable(); \ | |
98 | 0; \ | |
99 | }) | |
79a88102 | 100 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c LT |
101 | #define num_booting_cpus() 1 |
102 | #define smp_prepare_boot_cpu() do {} while (0) | |
83df8db9 | 103 | static inline int smp_call_function_single(int cpuid, void (*func) (void *info), |
79974a0e | 104 | void *info, int retry, int wait) |
83df8db9 | 105 | { |
a52b1752 AK |
106 | WARN_ON(cpuid != 0); |
107 | local_irq_disable(); | |
108 | func(info); | |
109 | local_irq_enable(); | |
110 | return 0; | |
83df8db9 | 111 | } |
1da177e4 LT |
112 | |
113 | #endif /* !SMP */ | |
114 | ||
115 | /* | |
39c715b7 | 116 | * smp_processor_id(): get the current CPU ID. |
1da177e4 | 117 | * |
39c715b7 IM |
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.) | |
1da177e4 | 122 | * |
39c715b7 IM |
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. | |
1da177e4 | 129 | */ |
39c715b7 IM |
130 | #ifdef CONFIG_DEBUG_PREEMPT |
131 | extern unsigned int debug_smp_processor_id(void); | |
132 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 133 | #else |
39c715b7 | 134 | # define smp_processor_id() raw_smp_processor_id() |
1da177e4 LT |
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 | ||
033ab7f8 AM |
141 | void smp_setup_processor_id(void); |
142 | ||
1da177e4 | 143 | #endif /* __LINUX_SMP_H */ |