6 * Alan Cox. <alan@redhat.com>
9 #include <linux/errno.h>
11 extern void cpu_idle(void);
15 #include <linux/preempt.h>
16 #include <linux/kernel.h>
17 #include <linux/compiler.h>
18 #include <linux/thread_info.h>
22 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
23 * (defined in asm header):
27 * stops all CPUs but the current one:
29 extern void smp_send_stop(void);
32 * sends a 'reschedule' event to another CPU:
34 extern void smp_send_reschedule(int cpu);
38 * Prepare machine for booting other CPUs.
40 extern void smp_prepare_cpus(unsigned int max_cpus);
45 extern int __cpu_up(unsigned int cpunum);
48 * Final polishing of CPUs
50 extern void smp_cpus_done(unsigned int max_cpus);
53 * Call a function on all other processors
55 int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
57 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
61 * Call a function on all processors
63 int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
65 #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
66 #define MSG_ALL 0x8001
68 #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
69 #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
72 #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
73 #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
76 * Mark the boot cpu "online" so that it can call console drivers in
77 * printk() and can access its per-cpu storage.
79 void smp_prepare_boot_cpu(void);
81 extern unsigned int setup_max_cpus;
86 * These macros fold the SMP functionality into a single CPU system
88 #define raw_smp_processor_id() 0
89 static inline int up_smp_call_function(void (*func)(void *), void *info)
93 #define smp_call_function(func, info, retry, wait) \
94 (up_smp_call_function(func, info))
95 #define on_each_cpu(func,info,retry,wait) \
97 local_irq_disable(); \
102 static inline void smp_send_reschedule(int cpu) { }
103 #define num_booting_cpus() 1
104 #define smp_prepare_boot_cpu() do {} while (0)
105 #define smp_call_function_single(cpuid, func, info, retry, wait) \
107 WARN_ON(cpuid != 0); \
108 local_irq_disable(); \
110 local_irq_enable(); \
113 #define smp_call_function_mask(mask, func, info, wait) \
114 (up_smp_call_function(func, info))
119 * smp_processor_id(): get the current CPU ID.
121 * if DEBUG_PREEMPT is enabled the we check whether it is
122 * used in a preemption-safe way. (smp_processor_id() is safe
123 * if it's used in a preemption-off critical section, or in
124 * a thread that is bound to the current CPU.)
126 * NOTE: raw_smp_processor_id() is for internal use only
127 * (smp_processor_id() is the preferred variant), but in rare
128 * instances it might also be used to turn off false positives
129 * (i.e. smp_processor_id() use that the debugging code reports but
130 * which use for some reason is legal). Don't use this to hack around
131 * the warning message, as your code might not work under PREEMPT.
133 #ifdef CONFIG_DEBUG_PREEMPT
134 extern unsigned int debug_smp_processor_id(void);
135 # define smp_processor_id() debug_smp_processor_id()
137 # define smp_processor_id() raw_smp_processor_id()
140 #define get_cpu() ({ preempt_disable(); smp_processor_id(); })
141 #define put_cpu() preempt_enable()
142 #define put_cpu_no_resched() preempt_enable_no_resched()
144 void smp_setup_processor_id(void);
146 #endif /* __LINUX_SMP_H */