AUTOCONF(9) | NetBSD Kernel Developer's Manual | AUTOCONF(9) |
cfdata_t
config_search_loc(cfsubmatch_t func, device_t parent, const char *ia, const int *locs, void *aux);
cfdata_t
config_search_ia(cfsubmatch_t func, device_t parent, const char *ia, void *aux);
device_t
config_found_sm_loc(device_t parent, const char *ia, const int *locs, void *aux, cfprint_t print, cfsubmatch_t submatch);
device_t
config_found_ia(device_t parent, const char *ia, void *aux, cfprint_t print);
device_t
config_found(device_t parent, void *aux, cfprint_t print);
int
config_match(device_t parent, cfdata_t cf, void *aux);
device_t
config_attach_loc(device_t parent, cfdata_t cf, const int *locs, void *aux, cfprint_t print);
device_t
config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print);
device_t
config_attach_pseudo(cfdata_t cf);
int
config_detach(device_t dev, int flags);
int
config_deactivate(device_t dev);
int
config_defer(device_t dev, void (*func)(device_t));
void
config_interrupts(device_t dev, void (*func)(device_t));
void
config_mountroot(device_t dev, void (*func)(device_t));
void
config_pending_incr();
void
config_pending_decr();
int
config_finalize_register(device_t dev, int (*func)(device_t));
The autoconfiguration framework supports direct configuration where the bus driver can determine the devices present. The autoconfiguration framework also supports indirect configuration where the drivers must probe the bus looking for the presence of a device. Direct configuration is preferred since it can find hardware regardless of the presence of proper drivers.
The autoconfiguration process occurs at system bootstrap and is driven by a table generated from a “machine description” file by config(1). For a description of the config(1) “device definition” language, see config(9).
Each device must have a name consisting of an alphanumeric string that ends with a unit number. The unit number identifies an instance of the driver. Device data structures are allocated dynamically during autoconfiguration, giving a unique address for each instance.
The role of func is to call the match function for each device and call config_attach_loc() for any positive matches. If func is NULL, then the parent should record the return value from config_search_loc() and call config_attach_loc() itself.
Note that this function is designed so that it can be used to apply an arbitrary function to all potential children. In this case callers may choose to ignore the return value.
Two special strings, “not configured” and “unsupported” will be appended automatically to non-driver reports if the return value is UNCONF or UNSUPP respectively; otherwise the function should return the value QUIET.
config_found_sm_loc() returns a pointer to the attached device's softc structure if the device is attached, NULL otherwise. Most callers can ignore this value, since the system will already have printed a diagnostic.
The caller is expected to allocate and fill the cfdata_t object and pass it to config_attach_pseudo(). The content of that object is similar to what is returned by config_search_loc() for regular devices.
Registered functions are all executed until all of them return 0. The callbacks should return 0 to indicate they do not require to be called another time, but they should be aware that they still might be in case one of them returns 1.
June 26, 2010 | NetBSD 5.99 |