05-06-2002
You can't get the ok prompt while the os is running. And you can't run telnet without an os.
You could hook up a serial connection and never run the os. But using openboot simply as a forth engine seems a tad wasteful.
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>
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LEARN ABOUT FREEBSD
config_intrhook
CONFIG_INTRHOOK(9) BSD Kernel Developer's Manual CONFIG_INTRHOOK(9)
NAME
config_intrhook -- schedule a function to be run after interrupts have been enabled, but before root is mounted
SYNOPSIS
#include <sys/kernel.h>
int
config_intrhook_establish(struct intr_config_hook *hook);
void
config_intrhook_disestablish(struct intr_config_hook *hook);
DESCRIPTION
The config_intrhook_establish() function schedules a function to be run after interrupts have been enabled, but before root is mounted. If
the system has already passed this point in its initialization, the function is called immediately.
The config_intrhook_disestablish() function removes the entry from the hook queue.
Before root is mounted, all the previously established hooks are run. The boot process is then stalled until all handlers remove their hook
from the hook queue with config_intrhook_disestablish(). The boot process then proceeds to attempt to mount the root file system. Any
driver that can potentially provide devices they wish to be mounted as root must use either this hook, or probe all these devices in the ini-
tial probe. Since interrupts are disabled during the probe process, many drivers need a method to probe for devices with interrupts enabled.
The requests are made with the intr_config_hook structure. This structure is defined as follows:
struct intr_config_hook {
TAILQ_ENTRY(intr_config_hook) ich_links;/* Private */
void (*ich_func)(void *arg); /* function to call */
void *ich_arg; /* Argument to call */
};
Storage for the intr_config_hook structure must be provided by the driver. It must be stable from just before the hook is established until
after the hook is disestablished.
Specifically, hooks are run at SI_SUB_INT_CONFIG_HOOKS(), which is immediately after the scheduler is started, and just before the root file
system device is discovered.
RETURN VALUES
A zero return value means the hook was successfully added to the queue (with either deferred or immediate execution). A non-zero return
value means the hook could not be added to the queue because it was already on the queue.
SEE ALSO
DEVICE_ATTACH(9)
HISTORY
These functions were introduced in FreeBSD 3.0 with the CAM subsystem, but are available for any driver to use.
AUTHORS
The functions were written by Justin Gibbs <gibbs@FreeBSD.org>. This manual page was written by M. Warner Losh <imp@FreeBSD.org>.
BSD
September 24, 2006 BSD