sys/boot/pc32/libi386/bootinfo.c

   1 /*-
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/boot/i386/libi386/bootinfo.c,v 1.35 2003/08/25 23:28:31 obrien Exp $
  27  * $DragonFly: src/sys/boot/pc32/libi386/bootinfo.c,v 1.4 2004/06/25 05:37:58 dillon Exp $
  28  */
  29
  30 #include <stand.h>
  31 #include <sys/param.h>
  32 #include <sys/reboot.h>
  33 #include <sys/linker.h>
  34 #include "bootstrap.h"
  35 #include "libi386.h"
  36 #include "btxv86.h"
  37
  38 /*
  39  * Return a 'boothowto' value corresponding to the kernel arguments in
  40  * (kargs) and any relevant environment variables.
  41  */
  42 static struct
  43 {
  44     const char  *ev;
  45     int         mask;
  46 } howto_names[] = {
  47     {"boot_askname",    RB_ASKNAME},
  48     {"boot_cdrom",      RB_CDROM},
  49     {"boot_userconfig", RB_CONFIG},
  50     {"boot_ddb",        RB_KDB},
  51     {"boot_gdb",        RB_GDB},
  52     {"boot_single",     RB_SINGLE},
  53     {"boot_verbose",    RB_VERBOSE},
  54     {"boot_vidcons",    RB_VIDEO},
  55     {"boot_serial",     RB_SERIAL},
  56     {NULL,      0}
  57 };
  58
  59 int
  60 bi_getboothowto(char *kargs)
  61 {
  62     char        *cp;
  63     int         howto;
  64     int         active;
  65     int         i;
  66
  67     /* Parse kargs */
  68     howto = 0;
  69     if (kargs  != NULL) {
  70         cp = kargs;
  71         active = 0;
  72         while (*cp != 0) {
  73             if (!active && (*cp == '-')) {
  74                 active = 1;
  75             } else if (active)
  76                 switch (*cp) {
  77                 case 'a':
  78                     howto |= RB_ASKNAME;
  79                     break;
  80                 case 'c':
  81                     howto |= RB_CONFIG;
  82                     break;
  83                 case 'C':
  84                     howto |= RB_CDROM;
  85                     break;
  86                 case 'd':
  87                     howto |= RB_KDB;
  88                     break;
  89                 case 'D':
  90                     /* all available consoles become active */
  91                     howto &= ~(RB_MUTE|RB_VIDEO|RB_SERIAL);
  92                     break;
  93                 case 'V':
  94                     howto |= RB_VIDEO;
  95                     break;
  96                 case 'm':
  97                     howto |= RB_MUTE;
  98                     break;
  99                 case 'g':
 100                     howto |= RB_GDB;
 101                     break;
 102                 case 'h':
 103                     howto |= RB_SERIAL;
 104                     break;
 105                 case 'p':
 106                     howto |= RB_PAUSE;
 107                     break;
 108                 case 'r':
 109                     howto |= RB_DFLTROOT;
 110                     break;
 111                 case 's':
 112                     howto |= RB_SINGLE;
 113                     break;
 114                 case 'v':
 115                     howto |= RB_VERBOSE;
 116                     break;
 117                 default:
 118                     active = 0;
 119                     break;
 120                 }
 121             cp++;
 122         }
 123     }
 124     /* get equivalents from the environment */
 125     for (i = 0; howto_names[i].ev != NULL; i++)
 126         if (getenv(howto_names[i].ev) != NULL)
 127             howto |= howto_names[i].mask;
 128     if (!strcmp(getenv("console"), "comconsole"))
 129         howto |= RB_SERIAL;
 130     if (!strcmp(getenv("console"), "nullconsole"))
 131         howto |= RB_MUTE;
 132     if (!strcmp(getenv("console"), "vidconsole"))
 133         howto |= RB_VIDEO;
 134     return(howto);
 135 }
 136
 137 /*
 138  * Copy the environment into the load area starting at (addr).
 139  * Each variable is formatted as <name>=<value>, with a single nul
 140  * separating each variable, and a double nul terminating the environment.
 141  */
 142 vm_offset_t
 143 bi_copyenv(vm_offset_t addr)
 144 {
 145     struct env_var      *ep;
 146
 147     /* traverse the environment */
 148     for (ep = environ; ep != NULL; ep = ep->ev_next) {
 149         i386_copyin(ep->ev_name, addr, strlen(ep->ev_name));
 150         addr += strlen(ep->ev_name);
 151         i386_copyin("=", addr, 1);
 152         addr++;
 153         if (ep->ev_value != NULL) {
 154             i386_copyin(ep->ev_value, addr, strlen(ep->ev_value));
 155             addr += strlen(ep->ev_value);
 156         }
 157         i386_copyin("", addr, 1);
 158         addr++;
 159     }
 160     i386_copyin("", addr, 1);
 161     addr++;
 162     return(addr);
 163 }