bootinfo32.c revision 40146
1181624Skmacy/*- 2181624Skmacy * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3181624Skmacy * All rights reserved. 4181624Skmacy * 5181624Skmacy * Redistribution and use in source and binary forms, with or without 6181624Skmacy * modification, are permitted provided that the following conditions 7181624Skmacy * are met: 8181624Skmacy * 1. Redistributions of source code must retain the above copyright 9181624Skmacy * notice, this list of conditions and the following disclaimer. 10181624Skmacy * 2. Redistributions in binary form must reproduce the above copyright 11181624Skmacy * notice, this list of conditions and the following disclaimer in the 12181624Skmacy * documentation and/or other materials provided with the distribution. 13181624Skmacy * 14181624Skmacy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15181624Skmacy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16181624Skmacy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17181624Skmacy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18181624Skmacy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19181624Skmacy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20181624Skmacy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21181624Skmacy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22181624Skmacy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23181624Skmacy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24181624Skmacy * SUCH DAMAGE. 25181624Skmacy * 26181624Skmacy * $Id: bootinfo.c,v 1.11 1998/10/09 07:11:19 msmith Exp $ 27181624Skmacy */ 28181624Skmacy 29181624Skmacy#include <stand.h> 30181624Skmacy#include <sys/param.h> 31181624Skmacy#include <sys/reboot.h> 32181624Skmacy#include <sys/linker.h> 33181624Skmacy#include <machine/bootinfo.h> 34181624Skmacy#include "bootstrap.h" 35181624Skmacy#include "libi386.h" 36181624Skmacy#include "btxv86.h" 37181624Skmacy 38181624Skmacystatic struct bootinfo bi; 39181624Skmacy 40181624Skmacy/* 41181624Skmacy * Return a 'boothowto' value corresponding to the kernel arguments in 42181624Skmacy * (kargs) and any relevant environment variables. 43181624Skmacy */ 44181624Skmacystatic struct 45181624Skmacy{ 46181624Skmacy char *ev; 47181624Skmacy int mask; 48181624Skmacy} howto_names[] = { 49181624Skmacy {"boot_askname", RB_ASKNAME}, 50181624Skmacy {"boot_userconfig", RB_CONFIG}, 51181624Skmacy {"boot_ddb", RB_KDB}, 52181624Skmacy {"boot_gdb", RB_GDB}, 53181624Skmacy {"boot_single", RB_SINGLE}, 54181624Skmacy {"boot_verbose", RB_VERBOSE}, 55181624Skmacy {NULL, 0} 56181624Skmacy}; 57181624Skmacy 58181624Skmacyint 59181624Skmacybi_getboothowto(char *kargs) 60181624Skmacy{ 61181624Skmacy char *cp; 62181624Skmacy int howto; 63181624Skmacy int active; 64181624Skmacy int i; 65181624Skmacy 66181624Skmacy /* Parse kargs */ 67181624Skmacy howto = 0; 68181624Skmacy if (kargs != NULL) { 69181624Skmacy cp = kargs; 70181624Skmacy active = 0; 71181624Skmacy while (*cp != 0) { 72181624Skmacy if (!active && (*cp == '-')) { 73181624Skmacy active = 1; 74181624Skmacy } else if (active) 75181624Skmacy switch (*cp) { 76181624Skmacy case 'a': 77181624Skmacy howto |= RB_ASKNAME; 78181624Skmacy break; 79181624Skmacy case 'c': 80181624Skmacy howto |= RB_CONFIG; 81181624Skmacy break; 82181624Skmacy case 'd': 83181624Skmacy howto |= RB_KDB; 84181624Skmacy break; 85181624Skmacy case 'g': 86181624Skmacy howto |= RB_GDB; 87181624Skmacy break; 88181624Skmacy case 'h': 89181624Skmacy howto |= RB_SERIAL; 90181624Skmacy break; 91181624Skmacy case 'r': 92181624Skmacy howto |= RB_DFLTROOT; 93181624Skmacy break; 94181624Skmacy case 's': 95181624Skmacy howto |= RB_SINGLE; 96181624Skmacy break; 97181624Skmacy case 'v': 98181624Skmacy howto |= RB_VERBOSE; 99181624Skmacy break; 100181624Skmacy default: 101181624Skmacy active = 0; 102181624Skmacy break; 103181624Skmacy } 104181624Skmacy cp++; 105181624Skmacy } 106181624Skmacy } 107181624Skmacy /* get equivalents from the environment */ 108181624Skmacy for (i = 0; howto_names[i].ev != NULL; i++) 109181624Skmacy if (getenv(howto_names[i].ev) != NULL) 110181624Skmacy howto |= howto_names[i].mask; 111181624Skmacy if (!strcmp(getenv("console"), "comconsole")) 112181624Skmacy howto |= RB_SERIAL; 113181624Skmacy return(howto); 114181624Skmacy} 115181624Skmacy 116181624Skmacy/* 117181624Skmacy * Copy the environment into the load area starting at (addr). 118181624Skmacy * Each variable is formatted as <name>=<value>, with a single nul 119181624Skmacy * separating each variable, and a double nul terminating the environment. 120181624Skmacy */ 121181624Skmacyvm_offset_t 122181624Skmacybi_copyenv(vm_offset_t addr) 123181624Skmacy{ 124181624Skmacy struct env_var *ep; 125181624Skmacy 126181624Skmacy /* traverse the environment */ 127181624Skmacy for (ep = environ; ep != NULL; ep = ep->ev_next) { 128181624Skmacy i386_copyin(ep->ev_name, addr, strlen(ep->ev_name)); 129181624Skmacy addr += strlen(ep->ev_name); 130181624Skmacy i386_copyin("=", addr, 1); 131181624Skmacy addr++; 132181624Skmacy if (ep->ev_value != NULL) { 133181624Skmacy i386_copyin(ep->ev_value, addr, strlen(ep->ev_value)); 134183340Skmacy addr += strlen(ep->ev_value); 135183340Skmacy } 136183340Skmacy i386_copyin("", addr, 1); 137181624Skmacy addr++; 138181624Skmacy } 139181624Skmacy i386_copyin("", addr, 1); 140181624Skmacy addr++; 141181624Skmacy return(addr); 142181624Skmacy} 143183340Skmacy 144181624Skmacy/* 145181624Skmacy * Copy module-related data into the load area, where it can be 146181624Skmacy * used as a directory for loaded modules. 147181624Skmacy * 148181624Skmacy * Module data is presented in a self-describing format. Each datum 149181624Skmacy * is preceeded by a 32-bit identifier and a 32-bit size field. 150181624Skmacy * 151181624Skmacy * Currently, the following data are saved: 152181624Skmacy * 153181624Skmacy * MOD_NAME (variable) module name (string) 154181624Skmacy * MOD_TYPE (variable) module type (string) 155181624Skmacy * MOD_ADDR sizeof(vm_offset_t) module load address 156181624Skmacy * MOD_SIZE sizeof(size_t) module size 157181624Skmacy * MOD_METADATA (variable) type-specific metadata 158181624Skmacy */ 159181624Skmacy#define COPY32(v, a) { \ 160181624Skmacy u_int32_t x = (v); \ 161181624Skmacy i386_copyin(&x, a, sizeof(x)); \ 162181624Skmacy a += sizeof(x); \ 163181624Skmacy} 164181624Skmacy 165181624Skmacy#define MOD_STR(t, a, s) { \ 166181624Skmacy COPY32(t, a); \ 167181624Skmacy COPY32(strlen(s) + 1, a); \ 168181624Skmacy i386_copyin(s, a, strlen(s) + 1); \ 169181624Skmacy a += roundup(strlen(s) + 1, sizeof(u_int32_t));\ 170181624Skmacy} 171181624Skmacy 172181624Skmacy#define MOD_NAME(a, s) MOD_STR(MODINFO_NAME, a, s) 173181624Skmacy#define MOD_TYPE(a, s) MOD_STR(MODINFO_TYPE, a, s) 174181624Skmacy 175181624Skmacy#define MOD_VAR(t, a, s) { \ 176181624Skmacy COPY32(t, a); \ 177181624Skmacy COPY32(sizeof(s), a); \ 178181624Skmacy i386_copyin(&s, a, sizeof(s)); \ 179181624Skmacy a += roundup(sizeof(s), sizeof(u_int32_t)); \ 180181624Skmacy} 181181624Skmacy 182181624Skmacy#define MOD_ADDR(a, s) MOD_VAR(MODINFO_ADDR, a, s) 183181624Skmacy#define MOD_SIZE(a, s) MOD_VAR(MODINFO_SIZE, a, s) 184181624Skmacy 185181624Skmacy#define MOD_METADATA(a, mm) { \ 186181624Skmacy COPY32(MODINFO_METADATA | mm->md_type, a); \ 187181624Skmacy COPY32(mm->md_size, a); \ 188181624Skmacy i386_copyin(mm->md_data, a, mm->md_size); \ 189181624Skmacy a += roundup(mm->md_size, sizeof(u_int32_t));\ 190181624Skmacy} 191181624Skmacy 192181624Skmacy#define MOD_END(a) { \ 193181624Skmacy COPY32(MODINFO_END, a); \ 194181624Skmacy COPY32(0, a); \ 195181624Skmacy} 196181624Skmacy 197181624Skmacyvm_offset_t 198181624Skmacybi_copymodules(vm_offset_t addr) 199181624Skmacy{ 200181624Skmacy struct loaded_module *mp; 201181624Skmacy struct module_metadata *md; 202181624Skmacy 203181624Skmacy /* start with the first module on the list, should be the kernel */ 204181624Skmacy for (mp = mod_findmodule(NULL, NULL); mp != NULL; mp = mp->m_next) { 205181624Skmacy 206181624Skmacy MOD_NAME(addr, mp->m_name); /* this field must come first */ 207181624Skmacy MOD_TYPE(addr, mp->m_type); 208181624Skmacy MOD_ADDR(addr, mp->m_addr); 209181624Skmacy MOD_SIZE(addr, mp->m_size); 210181624Skmacy for (md = mp->m_metadata; md != NULL; md = md->md_next) 211181624Skmacy if (!(md->md_type & MODINFOMD_NOCOPY)) 212181624Skmacy 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