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59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
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#ifndef INIT_H
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#define INIT_H
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/*
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* In order to avoid having objects dragged in just because main()
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* calls their initialisation function, we allow each object to
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* specify that it has a function that must be called to initialise
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* that object. The function call_init_fns() will call all the
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* included objects' initialisation functions.
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*
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* Objects that require initialisation should include init.h and
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* register the initialisation function using INIT_FN().
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*
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* Objects may register up to three functions: init, reset and exit.
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* init gets called only once, at the point that Etherboot is
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* initialised (before the call to main()). reset gets called between
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* each boot attempt. exit gets called only once, just before the
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* loaded OS starts up (or just before Etherboot exits, if it exits,
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* or when the PXE NBP calls UNDI_SHUTDOWN, if it's a PXE NBP).
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*
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* The syntax is:
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* INIT_FN ( init_order, init_function, reset_function, exit_function );
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* where init_order is an ordering taken from the list below. Any
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* function may be left as NULL.
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*/
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/* An entry in the initialisation function table */
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struct init_fn {
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void ( *init ) ( void );
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void ( *reset ) ( void );
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void ( *exit ) ( void );
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};
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/* Use double digits to avoid problems with "10" < "9" on alphabetic sort */
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#define INIT_CONSOLE "00"
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#define INIT_CPU "01"
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#define INIT_TIMERS "02"
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#define INIT_PCMCIA "03"
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#define INIT_MEMSIZES "04"
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#define INIT_HEAP "05"
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/* Macro for creating an initialisation function table entry */
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#define INIT_FN( init_order, init_func, reset_func, exit_func ) \
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static struct init_fn init_ ## init_func ## _ ## exit_func \
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__attribute__ ((used,__section__(".init_fns." init_order))) = { \
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.init = init_func, \
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.reset = reset_func, \
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.exit = exit_func, \
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};
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/* Function prototypes */
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void call_init_fns ( void );
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void call_reset_fns ( void );
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void call_exit_fns ( void );
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#endif /* INIT_H */
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