bootinfo.c revision 38466
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 * $Id$ 27 */ 28 29#include <sys/reboot.h> 30#include <stand.h> 31#include "bootstrap.h" 32 33 34/* 35 * Return a 'boothowto' value corresponding to the kernel arguments in 36 * (kargs) and any relevant environment variables. 37 */ 38static struct 39{ 40 char *ev; 41 int mask; 42} howto_names[] = { 43 {"boot_askname", RB_ASKNAME}, 44 {"boot_userconfig", RB_CONFIG}, 45 {"boot_ddb", RB_KDB}, 46 {"boot_gdb", RB_GDB}, 47 {"boot_single", RB_SINGLE}, 48 {"boot_verbose", RB_VERBOSE}, 49 {NULL, 0} 50}; 51 52int 53bi_getboothowto(char *kargs) 54{ 55 char *cp; 56 int howto; 57 int active; 58 int i; 59 60 howto = 0; 61 if (kargs != NULL) { 62 cp = kargs; 63 active = 0; 64 while (*cp != 0) { 65 if (!active && (*cp == '-')) { 66 active = 1; 67 } else if (active) 68 switch (*cp) { 69 case 'a': 70 howto |= RB_ASKNAME; 71 break; 72 case 'c': 73 howto |= RB_CONFIG; 74 break; 75 case 'd': 76 howto |= RB_KDB; 77 break; 78 case 'g': 79 howto |= RB_GDB; 80 break; 81 case 'h': 82 howto |= RB_SERIAL; 83 break; 84 case 'r': 85 howto |= RB_DFLTROOT; 86 break; 87 case 's': 88 howto |= RB_SINGLE; 89 break; 90 case 'v': 91 howto |= RB_VERBOSE; 92 break; 93 default: 94 active = 0; 95 break; 96 } 97 } 98 cp++; 99 } 100 for (i = 0; howto_names[i].ev != NULL; i++) 101 if (getenv(howto_names[i].ev) != NULL) 102 howto |= howto_names[i].mask; 103 if (!strcmp(getenv("console"), "comconsole")) 104 howto |= RB_SERIAL; 105 return(howto); 106} 107 108/* 109 * Copy the environment into the load area starting at (addr). 110 * Each variable is formatted as <name>=<value>, with a single nul 111 * separating each variable, and a double nul terminating the environment. 112 */ 113vm_offset_t 114bi_copyenv(vm_offset_t addr) 115{ 116 struct env_var *ep; 117 118 /* traverse the environment */ 119 for (ep = environ; ep != NULL; ep = ep->ev_next) { 120 vpbcopy(ep->ev_name, addr, strlen(ep->ev_name)); 121 addr += strlen(ep->ev_name); 122 vpbcopy("=", addr, 1); 123 addr++; 124 if (ep->ev_value != NULL) { 125 vpbcopy(ep->ev_value, addr, strlen(ep->ev_value)); 126 addr += strlen(ep->ev_value); 127 } 128 vpbcopy("", addr, 1); 129 addr++; 130 } 131 vpbcopy("", addr, 1); 132 addr++; 133} 134 135/* 136 * Copy module-related data into the load area, where it can be 137 * used as a directory for loaded modules. 138 * 139 * Module data is presented in a self-describing format. Each datum 140 * is preceeded by a 16-bit identifier and a 16-bit size field. 141 * 142 * Currently, the following data are saved: 143 * 144 * MOD_NAME (variable) module name (string) 145 * MOD_TYPE (variable) module type (string) 146 * MOD_ADDR sizeof(vm_offset_t) module load address 147 * MOD_SIZE sizeof(size_t) module size 148 * MOD_METADATA (variable) type-specific metadata 149 */ 150#define MOD_STR(t, a, s) { \ 151 u_int32_t ident = (t << 16) + strlen(s) + 1; \ 152 vpbcopy(&ident, a, sizeof(ident)); \ 153 a += sizeof(ident); \ 154 vpbcopy(s, a, strlen(s) + 1); \ 155 a += strlen(s) + 1; \ 156} 157 158#define MOD_NAME(a, s) MOD_STR(MODINFO_NAME, a, s) 159#define MOD_TYPE(a, s) MOD_STR(MODINFO_TYPE, a, s) 160 161#define MOD_VAR(t, a, s) { \ 162 u_int32_t ident = (t << 16) + sizeof(s); \ 163 vpbcopy(&ident, a, sizeof(ident)); \ 164 a += sizeof(ident); \ 165 vpbcopy(&s, a, sizeof(s)); \ 166 a += sizeof(s); \ 167} 168 169#define MOD_ADDR(a, s) MOD_VAR(MODINFO_ADDR, a, s) 170#define MOD_SIZE(a, s) MOD_VAR(MODINFO_SIZE, a, s) 171 172#define MOD_METADATA(a, mm) { \ 173 u_int32_t ident = ((MODINFO_METADATA | mm->md_type) << 16) + mm->md_size; \ 174 vpbcopy(&ident, a, sizeof(ident)); \ 175 a += sizeof(ident); \ 176 vpbcopy(mm->md_data, a, mm->md_size); \ 177 a += mm->md_size; \ 178} 179 180vm_offset_t 181bi_copymodules(vm_offset_t addr) 182{ 183 struct loaded_module *mp; 184 struct module_metadata *md; 185 186 /* start with the first module on the list, should be the kernel */ 187 for (mp = mod_findmodule(NULL, NULL); mp != NULL; mp = mp->m_next) { 188 189 MOD_NAME(addr, mp->m_name); 190 MOD_TYPE(addr, mp->m_type); 191 MOD_ADDR(addr, mp->m_addr); 192 MOD_SIZE(addr, mp->m_size); 193 for (md = mp->m_metadata; md != NULL; md = md->md_next) 194 MOD_METADATA(addr, md); 195 } 196 return(addr); 197} 198