196 lines
5.9 KiB
Groff
196 lines
5.9 KiB
Groff
.\" $NetBSD: cnmagic.9,v 1.3 2001/06/05 12:54:35 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 2000 Eduardo Horvath
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed for the
|
|
.\" NetBSD Project. See http://www.netbsd.org/ for
|
|
.\" information about NetBSD.
|
|
.\" 4. The name of the author may not be used to endorse or promote products
|
|
.\" derived from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\" --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )--
|
|
.\"
|
|
.Dd November 11, 2000
|
|
.Dt CNMAGIC 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm cn_trap ,
|
|
.Nm cn_isconsole ,
|
|
.Nm cn_check_magic ,
|
|
.Nm cn_init_magic ,
|
|
.Nm cn_set_magic ,
|
|
.Nm cn_get_magic ,
|
|
.Nm cn_destroy_magic
|
|
.Nd console magic key sequence management
|
|
.Sh SYNOPSIS
|
|
.Fd #include <sys/systm.h>
|
|
.Va typedef struct cnm_state cnm_state_t;
|
|
.Ft void
|
|
.Fn cn_trap
|
|
.Ft int
|
|
.Fn cn_isconsole "dev_t dev"
|
|
.Ft void
|
|
.Fn cn_check_magic "dev_t dev" "int k" "cnm_state_t *cnms"
|
|
.Ft void
|
|
.Fn cn_init_magic "cnm_state_t *cnms"
|
|
.Ft int
|
|
.Fn cn_set_magic "char *magic"
|
|
.Ft int
|
|
.Fn cn_get_magic "char *magic" "int len"
|
|
.Ft void
|
|
.Fn cn_destroy_magic "cnm_state_t *cnms"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nx
|
|
console magic key sequence management framework is designed to provide
|
|
flexible methods to set, change, and detect magic key sequences on console
|
|
devices and break into the debugger or rom monitor with a minimum of interrupt
|
|
latency.
|
|
.Pp
|
|
Drivers that generate console input should make use of these routines. A
|
|
different
|
|
.Va cnm_state_t
|
|
should be used for each separate input stream. Multiple devices that share
|
|
the same input stream, such as USB keyboards can share the same
|
|
.Va cnm_state_t .
|
|
Once a
|
|
.Va cnm_state_t
|
|
is allocated, it should be initialized with
|
|
.Fn cn_init_magic
|
|
so it can be used by
|
|
.Fn cn_check_magic .
|
|
If a driver thinks it might be the console input device it can set the
|
|
magic sequence with
|
|
.Fn cn_set_magic
|
|
to any arbitrary string. Whenever the driver recieves input,
|
|
it should call
|
|
.Fn cn_check_magic
|
|
to process the data and determine wheter the magic sequence has
|
|
been hit.
|
|
.Pp
|
|
The magic key sequence can be accessed through the
|
|
.Va hw.cnmagic
|
|
.Ic sysctl
|
|
variable. This is the raw data and may be keycodes rather than
|
|
processed characters, depending on the console deivce.
|
|
.Pp
|
|
Here is a description of the console magic interface:
|
|
.Bl -tag -width indent
|
|
.It Fn "void cn_init_magic" "cnm_state_t *cnm"
|
|
.Pp
|
|
Initialize the console magic state pointed to by
|
|
.Fa cnm
|
|
to a useable state.
|
|
.It Fn "void cnm_trap"
|
|
.Pp
|
|
Trap into the kernel debugger or rom monitor. By default this
|
|
routine is defined to be
|
|
.Fn console_debugger
|
|
but can be overriden in MI header files.
|
|
.It Fn "int cn_isconsole" "dev_t dev"
|
|
.Pp
|
|
Determine whether a given
|
|
.Fa dev
|
|
is the system console. This macro tests to see if
|
|
.Fa dev
|
|
is the same as
|
|
.Va cn_tab->cn_dev
|
|
but can be overriden in MI header files.
|
|
.It Fn "void cn_check_magic" "dev_t dev" "int k" "cnm_state_t *cnms"
|
|
.Pp
|
|
All input shoult be passed through
|
|
.Fn cn_check_magic
|
|
so the state machine remains in a consistent state.
|
|
.Fn cn_check_magic
|
|
calls
|
|
.Fn cn_isconsole
|
|
with
|
|
.Fa dev
|
|
to determine if this is the console. If that returns true then
|
|
it runs the input value
|
|
.Fa k
|
|
through the state machine. If the state machine completes a match
|
|
of the current console magic sequence
|
|
.Fn cn_trap
|
|
is called. Some input may need to be translated to state machine
|
|
values such as the serial line
|
|
.Li BREAK
|
|
sequence.
|
|
.It Fn "void cn_destroy_magic" "cnm_state_t *cnms"
|
|
.Pp
|
|
This should be called once what
|
|
.Fa cnms
|
|
points to is no longer needed.
|
|
.It Fn "int cn_set_magic" "char *magic"
|
|
.Fn cn_set_magic
|
|
encodes a
|
|
.Li nul
|
|
terminated string arbitrary string into values that can be used by
|
|
the state machine and installs it as the global magic sequence. The
|
|
escape sequence is character value
|
|
.Li 0x27
|
|
and can be used to encode special values:
|
|
.Pp
|
|
.Bl -tag -width "0x001" -compact -offset indent
|
|
.It 0x27
|
|
The literal value
|
|
.Li 0x27 .
|
|
.It 0x01
|
|
Serial
|
|
.Li BREAK
|
|
sequence.
|
|
.It 0x02
|
|
.LI Nul
|
|
character.
|
|
.El
|
|
Returns
|
|
.Li 0
|
|
on success or a non-zero error value.
|
|
.It Fn "int cn_get_magic" "char *magic" "int len"
|
|
Extract the current magic sequence from the sate machine and return
|
|
up to
|
|
.Fa len
|
|
bytes of it in the buffer pointed to by
|
|
.Fa magic .
|
|
It uses the same encoding accepted by
|
|
.Fn cn_set_magic .
|
|
Returns
|
|
.Li 0
|
|
on success or a non-zero error value.
|
|
.El
|
|
.Sh AUTHOR
|
|
The
|
|
.Nx
|
|
console magic key sequence management framework was designed and implemented by
|
|
Eduardo Horvath <eeh@netbsd.org>
|
|
.Sh SEE ALSO
|
|
.Xr sysctl 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nx
|
|
console magic key sequence management framework
|
|
first appeared in
|
|
.Nx 1.6 .
|