6b15efd961
Use bd_getdev() to work out a dev_t for the root device. Allow $rootdev to override $currdev as the root device. biosdisk.c Save the slice table and disklabel when opening a disk. Add bd_getdev(), which attempts to return a dev_t corresponding to a given device. Cases which it still doesn't get right: - The inevitable da-when-wd-also-exists - Disks with no slice table (the slice number is not set correctly) The first is difficult to get right, the second will be fixed in an upcoming commit. comconsole.c vidconsole.c getchar() should return an 8-bit value; some BIOSsen pack extra information in %eax. libi386.h Remove some stale prototypes, add new ones.
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/*
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* Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* From Id: probe_keyboard.c,v 1.13 1997/06/09 05:10:55 bde Exp
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*
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* $Id: comconsole.c,v 1.2 1998/09/17 23:52:09 msmith Exp $
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*/
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#include <stand.h>
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#include <bootstrap.h>
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#include <btxv86.h>
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#include "libi386.h"
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static void comc_probe(struct console *cp);
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static int comc_init(int arg);
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static void comc_putchar(int c);
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static int comc_getchar(void);
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static int comc_ischar(void);
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struct console comconsole = {
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"comconsole",
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"BIOS serial port",
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0,
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comc_probe,
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comc_init,
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comc_putchar,
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comc_getchar,
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comc_ischar
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};
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#define BIOS_COMPORT 0
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static void
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comc_probe(struct console *cp)
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{
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/* XXX check the BIOS equipment list? */
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cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
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}
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static int
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comc_init(int arg)
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{
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v86.ctl = V86_FLAGS;
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v86.addr = 0x14;
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v86.eax = 0xe3; /* 9600N81 */
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v86.edx = BIOS_COMPORT; /* XXX take as arg, or use env var? */
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v86int();
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return(v86.efl & 1);
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}
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static void
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comc_putchar(int c)
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{
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v86.ctl = 0;
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v86.addr = 0x14;
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v86.eax = 0x100 | c;
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v86int();
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}
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static int
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comc_getchar(void)
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{
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if (comc_ischar()) {
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v86.ctl = 0;
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v86.addr = 0x14;
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v86.eax = 0x300;
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v86int();
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return(v86.eax & 0xff);
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} else {
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return(-1);
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}
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}
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static int
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comc_ischar(void)
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{
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v86.ctl = 0;
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v86.addr = 0x14;
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v86.eax = 0x200;
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v86int();
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return(v86.eax & 0x1);
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}
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