bootinfo.c revision 40146
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: bootinfo.c,v 1.11 1998/10/09 07:11:19 msmith Exp $ 27 */ 28 29#include <stand.h> 30#include <sys/param.h> 31#include <sys/reboot.h> 32#include <sys/linker.h> 33#include <machine/bootinfo.h> 34#include "bootstrap.h" 35#include "libi386.h" 36#include "btxv86.h" 37 38static struct bootinfo bi; 39 40/* 41 * Return a 'boothowto' value corresponding to the kernel arguments in 42 * (kargs) and any relevant environment variables. 43 */ 44static struct 45{ 46 char *ev; 47 int mask; 48} howto_names[] = { 49 {"boot_askname", RB_ASKNAME}, 50 {"boot_userconfig", RB_CONFIG}, 51 {"boot_ddb", RB_KDB}, 52 {"boot_gdb", RB_GDB}, 53 {"boot_single", RB_SINGLE}, 54 {"boot_verbose", RB_VERBOSE}, 55 {NULL, 0} 56}; 57 58int 59bi_getboothowto(char *kargs) 60{ 61 char *cp; 62 int howto; 63 int active; 64 int i; 65 66 /* Parse kargs */ 67 howto = 0; 68 if (kargs != NULL) { 69 cp = kargs; 70 active = 0; 71 while (*cp != 0) { 72 if (!active && (*cp == '-')) { 73 active = 1; 74 } else if (active) 75 switch (*cp) { 76 case 'a': 77 howto |= RB_ASKNAME; 78 break; 79 case 'c': 80 howto |= RB_CONFIG; 81 break; 82 case 'd': 83 howto |= RB_KDB; 84 break; 85 case 'g': 86 howto |= RB_GDB; 87 break; 88 case 'h': 89 howto |= RB_SERIAL; 90 break; 91 case 'r': 92 howto |= RB_DFLTROOT; 93 break; 94 case 's': 95 howto |= RB_SINGLE; 96 break; 97 case 'v': 98 howto |= RB_VERBOSE; 99 break; 100 default: 101 active = 0; 102 break; 103 } 104 cp++; 105 } 106 } 107 /* get equivalents from the environment */ 108 for (i = 0; howto_names[i].ev != NULL; i++) 109 if (getenv(howto_names[i].ev) != NULL) 110 howto |= howto_names[i].mask; 111 if (!strcmp(getenv("console"), "comconsole")) 112 howto |= RB_SERIAL; 113 return(howto); 114} 115 116/* 117 * Copy the environment into the load area starting at (addr). 118 * Each variable is formatted as <name>=<value>, with a single nul 119 * separating each variable, and a double nul terminating the environment. 120 */ 121vm_offset_t 122bi_copyenv(vm_offset_t addr) 123{ 124 struct env_var *ep; 125 126 /* traverse the environment */ 127 for (ep = environ; ep != NULL; ep = ep->ev_next) { 128 i386_copyin(ep->ev_name, addr, strlen(ep->ev_name)); 129 addr += strlen(ep->ev_name); 130 i386_copyin("=", addr, 1); 131 addr++; 132 if (ep->ev_value != NULL) { 133 i386_copyin(ep->ev_value, addr, strlen(ep->ev_value)); 134 addr += strlen(ep->ev_value); 135 } 136 i386_copyin("", addr, 1); 137 addr++; 138 } 139 i386_copyin("", addr, 1); 140 addr++; 141 return(addr); 142} 143 144/* 145 * Copy module-related data into the load area, where it can be 146 * used as a directory for loaded modules. 147 * 148 * Module data is presented in a self-describing format. Each datum 149 * is preceeded by a 32-bit identifier and a 32-bit size field. 150 * 151 * Currently, the following data are saved: 152 * 153 * MOD_NAME (variable) module name (string) 154 * MOD_TYPE (variable) module type (string) 155 * MOD_ADDR sizeof(vm_offset_t) module load address 156 * MOD_SIZE sizeof(size_t) module size 157 * MOD_METADATA (variable) type-specific metadata 158 */ 159#define COPY32(v, a) { \ 160 u_int32_t x = (v); \ 161 i386_copyin(&x, a, sizeof(x)); \ 162 a += sizeof(x); \ 163} 164 165#define MOD_STR(t, a, s) { \ 166 COPY32(t, a); \ 167 COPY32(strlen(s) + 1, a); \ 168 i386_copyin(s, a, strlen(s) + 1); \ 169 a += roundup(strlen(s) + 1, sizeof(u_int32_t));\ 170} 171 172#define MOD_NAME(a, s) MOD_STR(MODINFO_NAME, a, s) 173#define MOD_TYPE(a, s) MOD_STR(MODINFO_TYPE, a, s) 174 175#define MOD_VAR(t, a, s) { \ 176 COPY32(t, a); \ 177 COPY32(sizeof(s), a); \ 178 i386_copyin(&s, a, sizeof(s)); \ 179 a += roundup(sizeof(s), sizeof(u_int32_t)); \ 180} 181 182#define MOD_ADDR(a, s) MOD_VAR(MODINFO_ADDR, a, s) 183#define MOD_SIZE(a, s) MOD_VAR(MODINFO_SIZE, a, s) 184 185#define MOD_METADATA(a, mm) { \ 186 COPY32(MODINFO_METADATA | mm->md_type, a); \ 187 COPY32(mm->md_size, a); \ 188 i386_copyin(mm->md_data, a, mm->md_size); \ 189 a += roundup(mm->md_size, sizeof(u_int32_t));\ 190} 191 192#define MOD_END(a) { \ 193 COPY32(MODINFO_END, a); \ 194 COPY32(0, a); \ 195} 196 197vm_offset_t 198bi_copymodules(vm_offset_t addr) 199{ 200 struct loaded_module *mp; 201 struct module_metadata *md; 202 203 /* start with the first module on the list, should be the kernel */ 204 for (mp = mod_findmodule(NULL, NULL); mp != NULL; mp = mp->m_next) { 205 206 MOD_NAME(addr, mp->m_name); /* this field must come first */ 207 MOD_TYPE(addr, mp->m_type); 208 MOD_ADDR(addr, mp->m_addr); 209 MOD_SIZE(addr, mp->m_size); 210 for (md = mp->m_metadata; md != NULL; md = md->md_next) 211 if (!(md->md_type & MODINFOMD_NOCOPY)) 212 MOD_METADATA(addr, md); 213 } 214 MOD_END(addr); 215 return(addr); 216} 217 218/* 219 * Load the information expected by an i386 kernel. 220 * 221 * - The 'boothowto' argument is constructed 222 * - The 'botdev' argument is constructed 223 * - The 'bootinfo' struct is constructed, and copied into the kernel space. 224 * - The kernel environment is copied into kernel space. 225 * - Module metadata are formatted and placed in kernel space. 226 */ 227int 228bi_load(char *args, int *howtop, int *bootdevp, vm_offset_t *bip) 229{ 230 struct loaded_module *xp; 231 struct i386_devdesc *rootdev; 232 vm_offset_t addr, bootinfo_addr; 233 char *rootdevname; 234 int bootdevnr; 235 u_int pad; 236 char *kernelname; 237 const char *kernelpath; 238 239 *howtop = bi_getboothowto(args); 240 241 /* 242 * Allow the environment variable 'rootdev' to override the supplied device 243 * This should perhaps go to MI code and/or have $rootdev tested/set by 244 * MI code before launching the kernel. 245 */ 246 rootdevname = getenv("rootdev"); 247 i386_getdev((void **)(&rootdev), rootdevname, NULL); 248 if (rootdev == NULL) { /* bad $rootdev/$currdev */ 249 printf("can't determine root device\n"); 250 return(EINVAL); 251 } 252 253 /* Boot from whatever the current device is */ 254 i386_getdev((void **)(&rootdev), NULL, NULL); 255 switch(rootdev->d_type) { 256 case DEVT_DISK: 257 /* pass in the BIOS device number of the current disk */ 258 bi.bi_bios_dev = bd_unit2bios(rootdev->d_kind.biosdisk.unit); 259 bootdevnr = bd_getdev(rootdev); 260 break; 261 262 default: 263 printf("aout_exec: WARNING - don't know how to boot from device type %d\n", rootdev->d_type); 264 } 265 free(rootdev); 266 *bootdevp = bootdevnr; 267 268 /* legacy bootinfo structure */ 269 bi.bi_version = BOOTINFO_VERSION; 270 bi.bi_kernelname = 0; /* XXX char * -> kernel name */ 271 bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */ 272 bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */ 273 /* bi.bi_bios_geom[] */ 274 bi.bi_size = sizeof(bi); 275 bi.bi_memsizes_valid = 1; 276 bi.bi_basemem = getbasemem(); 277 bi.bi_extmem = getextmem(); 278 279 /* find the last module in the chain */ 280 for (xp = mod_findmodule(NULL, NULL); xp->m_next != NULL; xp = xp->m_next) 281 ; 282 addr = xp->m_addr + xp->m_size; 283 /* pad to a page boundary */ 284 pad = (u_int)addr & PAGE_MASK; 285 if (pad != 0) { 286 pad = PAGE_SIZE - pad; 287 addr += pad; 288 } 289 290 /* copy our environment */ 291 bi.bi_envp = addr; 292 addr = bi_copyenv(addr); 293 294 /* pad to a page boundary */ 295 pad = (u_int)addr & PAGE_MASK; 296 if (pad != 0) { 297 pad = PAGE_SIZE - pad; 298 addr += pad; 299 } 300 /* copy module list and metadata */ 301 bi.bi_modulep = addr; 302 addr = bi_copymodules(addr); 303 304 /* all done copying stuff in, save end of loaded object space */ 305 bi.bi_kernend = addr; 306 307 *howtop |= RB_BOOTINFO; /* it's there now */ 308 309 /* 310 * Get the kernel name, strip off any device prefix. 311 */ 312 kernelname = getenv("kernelname"); 313 i386_getdev(NULL, kernelname, &kernelpath); 314 bi.bi_kernelname = VTOP(kernelpath); 315 *bip = VTOP(&bi); 316 317 return(0); 318} 319