e7451974bb
the first one in the config has priority. They can be switched using userconfig(). i386/i386/conf.c: Initialize the shared syscons/pcvt cdevsw entry to `nx'. Add cdevsw registration functions. Use devsw functions of the correct type if they exist. i386/i386/cons.c: Add renamed syscons entry points to constab. i386/i386/cons.h: Declare the renamed syscons entry points. i386/i386/machdep.c: Repeat console initialization after userconfig() in case the current console has become wrong. This depends on cn functions not wiring down anything important. sys/conf.h: Declare new functions. i386/isa/isa.[ch]: Add a function to decide which display driver has priority. Should be done better. i386/isa/syscons.c: Rename pccn* -> sccn*. Initialize CRTC start address in case the previous driver has moved it. i386/isa/syscons.c, i386/isa/pcvt/* Initialize the bogusly shared variable Crtat dynamically in case the stored value was changed by the previous driver. Initialize cdevsw table from a template. Don't grab the console if another display driver has priority. i386/isa/syscons.h, i386/isa/pcvt/pcvt_hdr.h: Don't externally declare now-static cdevsw functions. i386/isa/pcvt/pcvt_hdr.h: Set the sensitive hardware flag so that pcvt doesn't always have lower priority than syscons. This also fixes the "stupid" detection of the display after filling the display with text. i386/isa/pcvt/pcvt_out.c: Don't be confused the off-screen cursor offset 0xffff set by syscons. kern/subr_xxx.c: Add enough nxio/nodev/null devsw functions of the correct type for syscons and pcvt.
186 lines
3.6 KiB
C
186 lines
3.6 KiB
C
/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)subr_xxx.c 8.1 (Berkeley) 6/10/93
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* $Id: subr_xxx.c,v 1.3 1994/08/02 07:42:36 davidg Exp $
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*/
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/*
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* Miscellaneous trivial functions, including many
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* that are often inline-expanded or done in assembler.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <machine/cpu.h>
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extern int enosys __P((void));
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/*
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* Unsupported device function (e.g. writing to read-only device).
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*/
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int
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enodev()
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{
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return (ENODEV);
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}
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/*
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* Unconfigured device function; driver not configured.
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*/
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int
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enxio()
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{
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return (ENXIO);
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}
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/*
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* Unsupported ioctl function.
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*/
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int
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enoioctl()
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{
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return (ENOTTY);
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}
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/*
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* Unsupported system function.
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* This is used for an otherwise-reasonable operation
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* that is not supported by the current system binary.
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*/
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int
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enosys()
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{
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return (ENOSYS);
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}
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/*
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* Return error for operation not supported
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* on a specific object or file type.
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*/
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int
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eopnotsupp()
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{
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return (EOPNOTSUPP);
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}
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/*
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* Generic null operation, always returns success.
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*/
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int
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nullop()
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{
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return (0);
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}
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/*
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* Specific `no' and `null' operations.
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* XXX the general ones are bogus.
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* XXX device functions may belong elsewhere.
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*/
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#include <sys/conf.h>
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int
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noreset(dummy)
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int dummy;
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{
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return (ENODEV);
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}
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int
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nommap(dev, offset, nprot)
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dev_t dev;
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int offset;
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int nprot;
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{
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/* Don't return ENODEV. That would allow mapping address ENODEV! */
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return (-1);
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}
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void
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nostrategy(bp)
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struct buf *bp;
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{
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}
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/*
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* XXX this is probably bogus. Any device that uses it isn't checking the
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* minor number.
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*/
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int
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nullopen(dev, flag, mode, p)
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dev_t dev;
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int flag;
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int mode;
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struct proc *p;
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{
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return (0);
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}
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int
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nullclose(dev, flag, mode, p)
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dev_t dev;
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int flag;
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int mode;
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struct proc *p;
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{
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return (0);
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}
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void
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nullstop(tp, rw)
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struct tty *tp;
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int rw;
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{
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}
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int
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nullreset(foo)
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int foo;
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{
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return (0);
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}
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