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28 #ifndef _MACHINE_MACHINE_ROUTINES_H
29 #define _MACHINE_MACHINE_ROUTINES_H
31 #include <sys/cdefs.h>
33 #if defined (__i386__) || defined(__x86_64__)
34 #include "i386/machine_routines.h"
35 #elif defined (__arm__) || defined (__arm64__)
36 #include "arm/machine_routines.h"
38 #error architecture not supported
43 #ifdef XNU_KERNEL_PRIVATE
44 #pragma GCC visibility push(hidden)
47 * @function ml_cpu_can_exit
48 * @brief Check whether the platform code allows |cpu_id| to be
49 * shut down at runtime.
50 * @return true if allowed, false otherwise
52 bool ml_cpu_can_exit(int cpu_id
);
55 * @function ml_cpu_begin_state_transition
56 * @brief Tell the platform code that processor_start() or
57 * processor_exit() is about to begin for |cpu_id|. This
59 * @param cpu_id CPU that is (potentially) going up or down
61 void ml_cpu_begin_state_transition(int cpu_id
);
64 * @function ml_cpu_end_state_transition
65 * @brief Tell the platform code that processor_start() or
66 * processor_exit() is finished for |cpu_id|. This
67 * can block. Can be called from a different thread from
68 * ml_cpu_begin_state_transition().
69 * @param cpu_id CPU that is (potentially) going up or down
71 void ml_cpu_end_state_transition(int cpu_id
);
74 * @function ml_cpu_begin_loop
75 * @brief Acquire a global lock that prevents processor_start() or
76 * processor_exit() from changing any CPU states for the
77 * duration of a loop. This can block.
79 void ml_cpu_begin_loop(void);
82 * @function ml_cpu_end_loop
83 * @brief Release the global lock acquired by ml_cpu_begin_loop().
84 * Must be called from the same thread as ml_cpu_begin_loop().
86 void ml_cpu_end_loop(void);
89 * @function ml_early_cpu_max_number()
90 * @brief Returns an early maximum cpu number the kernel will ever use.
92 * @return the maximum cpu number the kernel will ever use.
95 * The value returned by this function might be an over-estimate,
96 * but is more precise than @c MAX_CPUS.
98 * Unlike @c real_ncpus which is only initialized late in boot,
99 * this can be called during startup after the @c STARTUP_SUB_TUNABLES
100 * subsystem has been initialized.
102 int ml_early_cpu_max_number(void);
104 #pragma GCC visibility pop
105 #endif /* defined(XNU_KERNEL_PRIVATE) */
109 * @abstract Broadcast events allowing clients to hook CPU state transitions.
110 * @constant CPU_BOOT_REQUESTED Called from processor_start(); may block.
111 * @constant CPU_BOOTED Called from platform code on the newly-booted CPU; may not block.
112 * @constant CPU_ACTIVE Called from scheduler code; may block.
113 * @constant CLUSTER_ACTIVE Called from platform code; may not block.
114 * @constant CPU_EXIT_REQUESTED Called from processor_exit(); may block.
115 * @constant CPU_DOWN Called from platform code on the disabled CPU; may not block.
116 * @constant CLUSTER_EXIT_REQUESTED Called from platform code; may not block.
117 * @constant CPU_EXITED Called after CPU is stopped; may block.
120 CPU_BOOT_REQUESTED
= 0,
126 CLUSTER_EXIT_REQUESTED
,
130 typedef bool (*cpu_callback_t
)(void *param
, enum cpu_event event
, unsigned int cpu_or_cluster
);
133 * @function cpu_event_register_callback
134 * @abstract Register a function to be called on CPU state changes.
135 * @param fn Function to call on state change events.
136 * @param param Optional argument to be passed to the callback (e.g. object pointer).
138 void cpu_event_register_callback(cpu_callback_t fn
, void *param
);
141 * @function cpu_event_unregister_callback
142 * @abstract Unregister a previously-registered callback function.
143 * @param fn Function pointer previously passed to cpu_event_register_callback().
145 void cpu_event_unregister_callback(cpu_callback_t fn
);
147 #if XNU_KERNEL_PRIVATE
149 * @function ml_broadcast_cpu_event
150 * @abstract Internal XNU function used to broadcast CPU state changes to callers.
151 * @param event CPU event that is occurring.
152 * @param cpu_or_cluster Logical CPU ID of the core (or cluster) affected by the event.
154 void ml_broadcast_cpu_event(enum cpu_event event
, unsigned int cpu_or_cluster
);
159 #endif /* _MACHINE_MACHINE_ROUTINES_H */